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Manual Part Number - Agilent Technologies

Contents

1. See introduction to this section for ordering information Indicates factory selected value 0699 0595 0699 1078 C4 1 8 TO 1133 F 0698 4158 0698 6360 0698 4158 0898 6360 C4 1 8 TO 2942 F 4 1 8 2042 0699 568 0699 0566 C4 1 87 TO 1001 F MF4C1 8 T9 1111R B 0698 6360 0698 8638 0698 8445 0899 0588 0699 0585 068 6467 0699 0587 0699 0588 2100 3883 0698 6444 0698 6423 0699 0587 0698 8858 0698 8858 0698 6625 6 29 Replaceable Parts Model 4935A fr Part P Part umber eference B Y umber Description esignator A13R109 0699 0588 RESISTOR 18 171K 1 125W 50 0699 0588 A13R110 0698 6360 RESISTOR 10K 1 125W TC 0 25 0698 6360 A13R111 0698 6467 RESISTOR 16 9K 1 125W F TC 0 50 0698 6467 A13R112 0699 0566 RESISTOR 25 5K 196 125W 0 25 0699 0566 A13R113 0699 0566 RESISTOR 25 5K 1 125W TC 204 25 0699 0566 bb 5 OO A13R114 0698 6445 RESISTOR 6 838 1 125W F 0 25 0698 6445 13 115 0698 8638 RESISTOR 3 16 1 125W TC 0 25 0698 8638 A13R116 0757 0289 RESISTOR 13 3K 1 125W TC 0 100 MF4C1 8 T0 1332 F3 A13R117 0699 0589 RESISTOR 34 334 1 125W F 0 25 0699 0589 138118 0699 0589 R
2. IMPULSE NOISE LATCHES 5V c79 C77 0 01 45V 45V _ C8 0 gt 16 3 FN 9 9 RESE P T B C COUNT A3 12 1 14 15 CLK INH DEC OUT v R21 10K 8 7 NZ 5V C80 0 01 500 R57 51 1K 10 R62 5 31 6K R56 1000 Y 45V R58 133K A MAE 0 1 10K Ls Lus uum 9 lay R64 SCHMITT TRIGGER CIRCUITRY 31 6K 14V VARIBLE HYSTERES S pow 44 202 200 15V C85 eee dg 5V 0 01 C82 5 0 01 83 i MISC C i CONTROL ees LATCH J9 3 FN U10 2 RESET UE H IMPN RESET NC 0 7 COUNTER counter 5 3 1 D 2 6 1 7 10 5V 7 D q1 P CLK INH CLK INH DEC OUT DEC OUT powers 8 4 D SQUARING T DROPOUT 5V LATCH R62 R63 3 ote Gh me 1004 HZ P HOLD TONE zd pos c E z R58 5V EN m R61 Reo gt T 31 6 10K ra 9 FREQUENCY R59 A 10K TONE DROPOUT DETECTOR be ie Lame Acc TM C91 0 01 Drs FREQUENCY DROPOUT CIRCUITRY s 19 s T TT rr lt lt 0 M w Service i A TO U6
3. i 1 1 i iu vu e Hii i 22233 HOLIMS ev 091311230 3S ON 42018 110 2 H5 3 2 itin 123735 39NVH HOLT TOW i ilid B S 2 v 3790N3 SOB viv3 Figure 8 6 Receiver Block Diagram 8 14 Model 4935A Service 13 If a tone signal 1s present and above 46 dBm then the tone dropout detector will reset the tone dropout latch 4 The microprocessor reads the tone dropout latch through the option and miscellaneous sense latches to determine if the tone dropout latch was reset TR If the tone dropout latch was not reset the microprocessor writes ERR 7 to the right hand display 8 73 RECEIVER THEORY OF OPERATION 8 74 The A3 receiver assembly contains all the circuits to do level measurements background noise measurements and impulse noise measurements All measurements are done by amplification filtering and detection of the received signal 8 75 The 4935A receiver can be divided into the following major circuits a Switching hold circuit termination b Input Selec
4. ___ i2 uts5D 13 NOT USED t TONE FREQ SELECT MUX REVISED 1 86 BEEP CONTROL MODE CONTROL 9 DISP STROBE TO 2 b ANNUN STROBE 29 own EN ut d 9 TO J3 y 22 2i 26 3 V 10 25 gt 27 30 SHEET OF 2 P O 43 43 D scum Flirt 22 20 18 Jt TL 3 4 A3 in DUAL QUAD BUFFER L u 4 1 4 Manual Changes NP MA s 7 oem PHASE STEP LATCHES PHASE ACCUMULATOR c 6 RTT TN LOK 6 FROM SWITCH BOARD RVC INPEDANCE 5 R45 Figure 7 29 A4 Transmitter Board Schematic Diagram Sheet 1 of 2 7 39 eo 101820 1ueuodui07 195041 J3Si 3d 8X V8bZZ 2 ul ogo9 sc 6bo Simones fA 559 yr S182 A 852 er ign 5 3 69 8 3 sen sin 62
5. 2 P O PI DISPLAY AND ANNUNCIATOR CIRCUITS 2 3 w ai t FROM A4 IRANSMITTER 5 el ASSY v i 13 3 3 14 g me I3 bh 3 b f f b f b T 8 4 8 d d d dp 4 dp do M 084 056 056 087 i RD 102 i ome esa ea Ll re ee 2 4 el 2 5 3 25 5 ae ee J x amp pr rg 26 P a ae ES 4 28 e 24 CONTROL __ TRI OUT gt 23 os p 22 1 U48 e l CNT ed N RS gt 20 68 19 41 uv 18 RES CS iz d p CE 16 1 14V 24 a 9 5 DO b 25 d gn MM vi dL R s R28 FROM A3 m 2 RECEIVER ASSY 4 gt 1000PF x 5 5 5 MONITOR VOLUME 10 P O PI NOTE R35 CASE TIED TO SUPPORT R35 LEG OF OUTPUT LEVEL POT Ok THROUGH WIRE TO GROUND PLANE OUTPUT LEVEL ur ate SETUP SHIE D 1 P 561 9 M 5e acne hd LEFT V 4 IP
6. I S3H231IAS 211 5 ZY H3ALLIINSNVH L tY loin Pd LINX Qi S39Y170A SU AGE 531531178 0834 411 8 1 2167 NO 1 i 1 128 090 484 1 1 H l l 1 i 1 1 0243 1282 v E 0 0001 ceu 0152 1445 3 1 OY i 2 14305 1398 3NI 1 JY zu Ofd 5310 ASSY 331 1 1 yuo LI Avis 0143 N a1 lt AS 0 d lt 42 7 iiy vi I o 7 5 NOILYY3J0 OY R Lo _ _ _ _ JN Sp bi 1178 ast SY 310N AL gt ni S ae 3 A 9 i ss 8 82 Ed 170 T ate Un i I 13 ity 59 I i 1 eC j 0E A2 9 i 628 2 B i S3IHN3H NI 30NY12nONI 4 NI 3O NYII2YGYO T 3k NI 324 151 3 Apis 031Y2IONI 3SIMN3HIO SS37NAh Z
7. ak ee MOR ier 2088 _ mp m ane Qn us an VOUT AU volts from Amp 4 27 4 28 blank 4935 Adjustment Calibration SECTION V ADJUSTMENT CALIBRATION 5 1 INTRODUCTION D 2 This section contains adjustment and calibration information for the HP Model 4935A Transmission Test Set Verify all adjustments and calibrations with the tests in Section IV Performance Tests 5 3 SAFETY CONSIDERATIONS 5 4 I isted warnings and cautions must be followed for your protection and to avoid damage to the equipment Whenever internal instrument circuits are exposed caution must be exercised When using AC powered test equipment the test equipment chassis should be connected to earth ground With the 4935A in STBY standby AC power is still applied to the instrument and some DC voltages are still present To completely power down the instrument disconnect it from the AC power source For instruments with the batteries Options 002 and 003 disconnect the three batteries and the AC power source Power switch does not turn off AC power and some DC power circuits 5 5 EQUIPMENT REQUIRED 5 6 Test equipment needed for adjustments is listed in Table 1 2 Test equipment with equivalent specifications may be substituted 5 7 Instrument Access see warning of paragraph 5 4 5 8 The instrument s internal
8. J I 1 AO t MISC CONTROL pU I A2 ao FUNCTION at LX X 1X RESET IMPULSE NOISE LATCH pene x o x ENABLE OPTION SELECT BUFFER jud FROM A3 1 x X 1 X DISABLE OPTION SUFFER RECEIVER x i X X RESET OPEN FREQ MEASUREMENT TT 6 oO x X X SELECT LEVEL COUNTER 1 5 asy Li X X X SELECT EVENTS To COUNTER s SQUARING LE x 1004 HZ us 1260 MOLD 66 ROS CC PNEU pee 7 JUUL M s PORT ul r N 7 I R58 26 R61 REO 51 90 2d Set 1 id ines TONE DROPOUT AAT P s A DETECTOR 14 7K 17 DETECTOR L AUTORANGE SIGNAL SINE Rave VARIABLE HYSTERESIS 7 25 A WITH P AR 04938 60307 REV C 2314A io 1 chy NOT USED M INH DEC OUT DEC OUT uo FREO MEAS CONTROL READ BUFF 00 77 7 FREQUENCY DROPOUT CIRCUITRY OPTION _ OPEN RESET E REQ LEVEL Sti CHIP ENABLE DECODER FUNCTION FREQUENCY SELECT 1004 TONE SELECT READ ENABLE IMPED STATUS ENABLE READ DISABLE IMPED STATUS DISABLE CSA2 5 5 Do Di 02 03 NC 04 NC
9. 4 11 7 17 Transmitter Board Component 4 6 Impulse Noise DAC 4 14 scare 7 28 47 Count Limit Test 4 16 7 18 A4 Transmitter Board Schematic 4 8 Termination Impedance 4 17 IBID NE E D o as 7 29 4 9 Hold Tone Dropout Detector Test 4 19 7 19 Al4 Transmitter Board Schematic 4 10 Testi ici ness 4 20 Diagrami Partial tete 7 30 4 11 Distortion Test enn 4 2 7 20 Al4 Transmitter Board Schematic 4 12 40 dBm Distortion 4 22 Partial x an ede rd 7 30 Filler Circus oae e cte 4 23 7 21 A2 Switchboard Component Locator 2152 AL SSSR u 4 25 7 22 A2 Switchboard Schematic Diagram 7 33 4 15 Noise to Ground Test 4 26 7 23 Receiver Board Component Model 4935A Section 7 24 7 25 7 26 7 27 7 28 7 29 7 30 7 3 7 32 8 1 8 2 8 3 8 4 8 5 8 6 8 7 8 8 8 9 8 10 8 11 8 12 8 13 8 14 8 17 8 18 Table of Contents LIST OF ILLUSTRATIONS Title Page LOCO o n vase etu 7 34 Receiver Board Component TOC ALOT u 7 39 Receiver Board Schematic Diagram Sheet 1 02 2
10. KEY CAP BOO SETUP TRMT R I TWISTED PAIR JMPR WASHER FLAT see introduction to this section for ordering information ndicates factory selected value Replaceable Parts fr Part umber 0340 0992 ORDR BY DSCRPTN ORDR BY DSCRPTN ORDR BY DSCRPTN ORDRBYDSCRPTN ORDR BY DSCRPTN 5041 0201 5041 1931 5041 1932 5041 1933 5041 1934 5041 1935 5041 1936 5041 1938 5041 1939 0493561603 ORDR BY DSCRPTN Replaceable Parts eference esignator 6 12 0493564032 0180 3124 0180 1746 0180 1746 0180 1746 0160 6623 0160 5719 0160 6623 0160 6623 0160 6623 0160 6573 0160 6623 0160 6623 01 W 6623 0160 6623 0160 6623 0 160 6623 0160 6539 0160 6623 0160 6623 0160 6623 140 160 0 160 6623 0160 6539 0180 0374 0180 0374 01 80 8 23 0160 6623 0180 6623 0180 0374 0180 0374 0 160 0374 0160 6623 0140 0190 0160 0167 0160 6623 0160 6623 0160 6623 0180 0374 0180 0374 0160 7103 0160 7099 0160 6623 0160 6623 0180 6623 0160 6623 0180 6623 0160 6623 0160 6646 0180 0374 0160 7098 0160 7100 0160 6623 0160 6623 01800197 0 0160 7100 0160 7100 0160 6268 0160 6595 0160 6268 OAN OOH FAO Gong UO hah coco codo NUM AN AG OQpOOGO RECEIVER BOARD Std Units only RECEIVER BOARD ASSY STD UNIT ONLY CAPACITOR FXD 75UF 100 2096 300VDC AL CAPACITOR FXD 1 UF
11. 5 Storage and Shipment 2 2 22 2 Instrument Packaging 2 2 OPERATION eee ett 3 1 eset TURO 3 1 rius 3 1 Operating Instructions 3 6 Measurements oor RH Measurement Principles 3 17 Input Output Switching 3 17 Level and Frequency Measurements 3 18 1000 u u 3 18 Frequency cantare 3 18 Attenuation Distortion 3 18 gb dfe TUE 3 19 Message Circuit Noise Measurements 3 19 Noise Measurements 3 22 Noise with Tone Notched Noise 3 22 Signal to Noise Measurement 3 22 Section 3 48 3 52 3 55 3 59 IV 4 4 3 4 5 4 0 4 12 4 13 4 14 4 15 4 16 4 17 4 18 4 19 4 20 4 21 4 22 4 23 4 24 4 25 5 5 3 5 5 5 9 5 11 5 13 5 14 5 15 5 17 5 18 5 19 Title Page Signal Frequency Interference 3 24 sayu 3 24 Noise to Ground Measurement 3 25 Peak to Average Ratio Measurement 3 2 5 PERFORMANCE TESTS Introduction 4 1 E
12. T 29 i 4 i C32 0 1 2 3 d 14 PETIERE 845 560 IT TRANSMITTER ey em wawara ee w I s n Manual Changes I 1 I t l r 1 P O ARNG P Tp REV Ji TO MONITOR SPEAKER NOTE JI 5 NOT GROUNDED I t ah Pr d ee m E ud s RES TQ Ea 1 1 IMPULSE NOISE DETECTORS 1 i gt TO 5 TRANSMITTER oy Ril RIO AS Re 2150 B Tn IMP NH ah z naar di U2B RT x D 3 5190 IMPNM E ue i cas aac 14 926 R6 Ws qe 6190 IMPNL TR AN o 9 1 12 14 cid jot 14 71 RIT 10K V CIRCUIT APPLIES TO STANDARD UNITS ONLY 1 CIRCUIT APPLIES TO P AR UNITS ONLY 1 i TRUTH TABLE FOR 013 3 Ju2 ADD DIP UB wW e 2j 0 SELECTED LEVEL T LOW THRESH o MIO THRESH EE ER 4
13. 8 26 General Information a 8 1 8 146 Relay Drive Circuitry 8 26 How Measurements are Made 8 3 8 148 COME CUM oet u Susana 8 26 Level and Frequency 8 4 8 153 Maintenance 8 28 NOISE 8 4 8 1 55 Periodic Maintenance 8 28 Noise with Tone 8 4 8 157 Failure Maintenance 8 28 Signal to Noise 8 5 8 159 Component Replacement 8 28 Impulse 8 5 8 164 SO ASHI cust buste iun n 8 28 Noise to Ground Std amp Opt 001 8 6 8 166 leanne saus a muu Q 8 28 10 8 168 Disassembly 8 29 Opt s 002 amp 003 8 6 8 169 Remove C pn 8 29 Frequency Measurement 8 6 8 171 Receiver Board Shield Plate Level Mceasurement 8 7 Battery Charger Board Disassembly 8 29 How to Compute Frequency and Level 8 173 Switchboard Front Panel Removal 8 30 Meas rement uoa cos oO deep
14. 13881 0699 1078 A13R82 0698 4516 A13R83 0698 4158 A13R84 0698 6360 A13R85 A13R86 A13R87 A13R88 13 89 0698 4158 A13R90 A13R91 0757 0280 A13R92 0698 7847 A13R93 0698 6360 A13R94 0698 8638 13895 0698 6445 A13R96 0699 0586 A13R97 0699 0585 A13R98 0698 6467 1 399 A13R100 A13R102 A13R103 A13R104 A13R105 VUNDO OOOGO0 DNOU PNW ougoooo W WON NOTO 0698 8858 0698 8858 0698 6625 A13R106 138107 A13R108 Description RESISTOR 511 1 125W F TC 0 100 RESISTOR 511 1 125W TC 0 100 RESISTOR 511 1 125W TC 0 100 RESISTOR TRMR 5K 10 TOP ADJ 17 TRN RESISTOR 10K 1 125W F TC 0 100 RESISTOR 750 1 125W TC 0 100 RESISTOR 15 8K 1 125W F TC 0 100 RESISTOR 15 8K 1 125W TC 0 100 RESISTOR 1 1K 196 125W TC 04 100 RESISTOR 2 37K 1 125W TC 20 100 RESISTOR 10K 196 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 750K 196 125W RESISTOR 15 8K 1 125W TC 0 100 RESISTOR 15 8K 1 125W TC 0 100 RESISTOR 4 6K 1 125W TC 0 100 RESISTOR 9 76K 1 125W F TC 0 100 RESISTOR 1 111 1 125W F TC 0 25 RESISTOR 10K 1 125W TC 0 25 RESISTOR 2 37K 1 125W RESISTOR 196K 1 125W TC 0 100 RESISTOR 100 1 125W F TC 0 100 RESISTOR 5 11K
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17. 5 8 Hold Circuit Adjustments 5 9 Table of Contents Section VI 6 1 6 3 6 5 7 1 7 3 7 6 VIII 8 8 8 8 10 8 13 8 16 8 19 8 22 8 26 8 29 8 32 8 34 8 38 8 39 8 42 8 44 8 45 8 48 8 51 8 52 8 54 8 57 8 58 8 62 8 64 8 66 8 68 8 73 8 76 yi TABLE OF CONTENTS cont Model 4935A Title Page Section Title Page REPLACEABLE PARTS 8 80 Input Select Notch Filter 25 0B Ana eee ttes usu 8 17 Introduction 2a tte eere Dia 6 1 8 85 Noise Filter Circuitry 8 17 Replaceable Parts List aus eee 6 1 8 97 cussed tes 8 19 Ordering Information 6 1 8 100 Impulse Noise Detectors 8 19 8 102 Transmitter 8 19 MANUAL CHANGES 8 104 Test Signal Generation Method 8 20 8 113 Circuit DeSCEIDLIOTL 8 21 e D 1 1 8 126 Power Supply Theory 8 23 Mangal C hani ESen e 7 1 8 128 AC Line Supplies 8 23 Manual Change Instructions 7 1 8 131 Regulators uwa huan i dba 8 24 8 139 Charger Board Theory of Operation 8 25 SERVICE 8 141 Battery Charging 8 26 8 144 Power Source Selection
18. 6 2 Manufacturer Code 451 6 8 Replaceable Parts cseserst tts 6 9 x blank Table 7 1 8 8 2 8 3 8 5 8 6 8 7 8 8 8 9 8 10 8 11 8 12 8 13 8 14 8 15 8 16 8 17 8 18 8 19 8 20 8 21 8 22 8 23 8 24 8 25 8 26 8 27 8 28 Title Page Manual 7 1 Measurements Summary 8 3 Noise Amplification 8 5 Reference Signatures inae 6 38 Wideband Filter 8 40 5 kHz Low Pass Filter Response 8 40 Output Select MUX 8 41 Transmit Monitor Test 8 43 ASUIB Voltapes made 8 51 TPS ines 8 51 Hand Selection of Noise Filters 8 58 Autorange Cus osse 8 59 Hand Selection of C57 and 160 8 60 4935A C Message 8 61 4935A 3KHZ Filter 8 61 4935A 15 KHz Filter 8 61 4935A Program Filter 8 61 4935A 50 kBit Filter 8 62 4935A Notch Filter 8 62 2035 A P A R Fi
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20. 204751 1 HP204751PF2C1 HP204751PF2C1 0160 0576 0160 0576 7 47 Model 4935 Manual Changes Table 6 3 Replaceable Parts Continued Reference HP Part Mfr Part Designator Number Description Number A3C74 0160 6188 9 CAPACITOR FXD 110PF 4 196 300VDC MICA AE RE A3C75 0160 0576 5 CAPACITOR FXD 20 50VDC CER 28480 0160 0576 A3C76 0160 0576 5 CAPACITOR FXD TUF 0 50VDC 28400 0160 0576 77 0160 0576 5 CAPACITOR FXD tUF 20 50VDC CER 28480 0160 0576 A3C78 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 13 40751PF3C1 9 0160 6317 4 CAPACITOR FXD 4 751 190 300VDC 0140 0225 9 1 CAPACITOR FXD 300 190 200VDC MICA 28480 0160 0218 0160 0218 2 5 CAPACITOR FXD 2400PF 1 300VDC MICA 28480 0160 3291 A3C82 0160 3291 7 CAPACITOR FXD 1200PF 1 1000VDC MICA 28480 0160 0576 0160 0576 5 1UF UF20 CER 284 A3CB4 0160 0218 2 CAPACITOR FXD 2400PF 1 300VDC MICA aang BOGE 5 0160 6320 9 CAPACITOR FXD 1700PF 1 100VDC MICA 08113 204 7 1 1 A3C87 0160 6320 9 1700PF 1 100VDC MICA 28480 0160 0576 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 08113 HP204 751PF3C1 9 0160 6405 1 CAPACITOR FXD 010 1 100VDC MICA A3C90 0160 0576 5 CAPACITOR FXD 01UF 1 20 VDC CER 58150 9 0160 0576 5 CAPACITOR F XD
21. Manual Changes Model 493 4936 50 JU ANALOG OUTPUT Se HOT 1 72 DE ditio I 49 R r nee i 48 2 14 39 13 10 x 1 8 A 51 13 12 IN 10 A Goo e Ka L Mw uw AU gt Pm MO XO gt d EE lt Q hm ac Lo Q G OD o u 1 gt 2 m E 0 m 16 16 18 i 14 amp 4 L 2 15 2 2 14 2 E 2 29 2 13 3 14 3 3 ts 3 14 R R 4 U s 4 s 4 13 14 27 csaz L I si 5 s si d 13 26 t 20 2 6 s 8 2 1 25 2 19 3 see een i 4 C29 T 7 loo 17 24 3 gt x 9 xis j9 a 8 3 18 23 4 175 D LOADED c T R at Y he 19 22 s 1 18 lt z F iz al 1 gt 21 s 3 15 SAR Sire 7 5 i 9 4 o I P D r dq o CLK CLK 5 14 9 9 8 13 5 7 I 2 le 4 if 14 14 W d eio 7 16 3 R 2 1 3 2 13 2 13 2 2 7 3 4 5 L I 3 12 3 1 9 18 u 3 3 3 U oll amp 4 Vt a 4 4 1 11 i
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25. DBE ceBe H Age 2042207 pJeog 1 11 vv 65 8 anid eee us s 8X1 008 5 9 8 9 9012 1 9 5602 8 5 019 9 5 015 5 9 2012 0 tu 5 1019 9 5 0012 962 962 ed 2 3 160 o L 6 3 962 2 63 r60 4 Lo t 3 160 13 cea 062 1 2 23 aso 1 3 822 45 189 t8 985 z 9 8 91g 85 viy 0 9 8 1 9 ceo c a vg 2 8 ilH ra 22 1 8 Dig vg 642 1 8 945 4H 8 5 3 9 2 t ra St PLD e3 2 9 8 2 v 842 98 eo 492 9 0 10 s99 H 90 tH 78D t 5 eo 1 0 2852 12 rH 952 v 552 ea 015 Lana ld rD 555 8 4 PAF 5 262 cor tJ 975 t d Sro tO LAT 8 5 wine g 8 4 enr 5 3 Zro 3 snr 4 ind znr 8 4 ord ro int sa 925 1 er 5 3 55 er 2 3 rco ir i 3 555 5 5 bed eco 8 3 12314 125 LH oco i H 6242 8 0 5 9 sa Beo 5 9 4280 r3 ea s a e0 5 3 222 LG 122 8 2 oe2 ELE 2 0 t
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27. is inscribed rear panel The first four digits and the letter are the serial prefix The serial prefix will change only if changes are made to the instrument a Manual Change Sheet will be included with the manuals of any instruments affected Thelast five numbers form the serial suffix which is unique to each instrument 1 7 SPECIFICATIONS 1 8 Instrument specifications are listed in Table 1 General Information 14 General Information Model 4935A l l Specifications TRANSMITTER RECEIVER Frequency Frequency Frequency Range 20 Hz to 110 kHz Frequency Range 20 Hz to 110 kHz Resolution Accuracy Resolution Accuracy 20 99 999 Hz 1Hz 005 of output frequency 20 9 999 Hz 1 Hz 0 5 Hz 100 1 10 kHz 10 Hz t 012 of output frequency 10 110 kHz 10 Hz 5 Hz Store and Recall Functions SK Skip At power up skips a band from 2450 2750 Frequencies At power up F1 is 404 Hz F2 is 1004 Hz F3 is 2804 Hz 4 is 2713 Hz Level Level Range 40 to 13 dBm Range 69 to 13 dBm Resolution 0 1 dB 0 1 dB ce es in dB ee qusa ia in dB FREQUENCY Hz FREQUENCY Hz 20 200 15k 60k 85k 110k 20 50 200 15k 60k 85k 110k 1 3 um I 1 3 83 55 gt 10 40 2 0 40 6
28. MEASUREMENT FILTER IMPULSE NOISE sss C MESSAGE 15 MIN OLOW SET IEEE 4 NOISE 7 G wiTH TONE 15 KHz FLAT 160 MIN C HIGH PROGRAM STOP x 1 50 MONITOR Wa s VOLUME r NOISE TO GROUND O MEAS A Eis STORE IMPULSE NOISE RECEIVER e Press MEAS key to select IMPULSE NOISE Press DISPLAY TRMT RCV key to display the received signal RCV light will be on Press FILTER key to select the appropriate filter Use STEP UP STEP DOWN and lt gt keys to adjust the level of the LOW threshold shown in the left display The LOW threshold may be set at any value between 30 and 109 60082 Note Err 8 indicates the threshold is set out of limits See paragraph 3 6 for limits Press PERIOD key to set the time of the test to 5 MIN 15 MIN 60 MIN or NON STOP Press START RESET key to start the test The CNTNG LED by the right display will go on to indicate that the test is in progress Note that you can see how many counts have been accumulated at each threshold by pressing DISPLAY key When NON STOP is selected STOP must be pressed to stop counting The left display shows threshold or minutes the right display shows the number of counts for the threshold selected Note The 1010 Hz notch filter is automatically used when the C Message or 3 kHz flat filter is selected it is not used for the other filters Note A minus sign in
29. wd ee xx NOISE FILTER elect according to test C MESSAGE FILTER 1 Select the C MESSAGE filter on 4935 2 Check the response at each frequency in Table 4 7 The 4935A should be within the range given Table 4 7 C Message Filter Test FREQUENCY RECEIVED LEVEL dBrn in Hz ACCEPTABLE READINGS 4 11 Performance Tests Model 4935A PERFORMANCE TESTS T kHZ FLAT FILTER TEST m Select the 3 kHz FLAT Filter on the 4935A 2 Check response at each frequency Table 4 8 The 4935A display should be within the range given Table 4 8 3 kHz Flat Filter Test FREQUENCY RECEIVED LEVEL dBrn in Hz ACCEPTABLE READINGS 90 Jp kHZ FLAT FILTER TEST 1 Select tho 15 kHz FLAT Filter the 4935A 2 Check the response at each frequency in Table 4 9 The 493 display should be within tho range given Table 4 9 15 kHz Flat Filter Test FREQUENCY RECEIVED LEVEL dBrn in Hz ACCEPTABLE READINGS PROGRAM FILTER TEST l Select the PROGRAM filter on the 4935A 2 heck the response at each frequency in Table 4 1 0 The 4935A display should be within the range given Table 4 10 Program Filter Test FREQUENCY RECEIVED LEVEL dBrn in Hz ACCEPTABLE READINGS 4 Model 4935A Performance Tests PERFORMANCE TESTS 50 kBIT FILTER TEST l the SO filter on the 4935A 2 Check the responsc at cach frequency in Tab
30. 44 6 5 6 e 5 i i 78 ayay y TEM r n MT PERNT ey POE df xe gio d 9 a 9 a9 cL S Ab a 4 8 st 81960 d R20 A m cT ai 4 4 E TAI N 4 amp pr n R21 2 ae Nm 9 at 2 2 2 ane RES aye 415 1129 n ee TE pe jn TER OM 16891 _ j JE 843 eye T P TP22 Y 4 te fyi zl gt 2 2 I oe Zw x C Mo e eme T 14 ey o 407 14 q CYR D 5 3 e l vu g 6 5 vd 4 4 4 1 f 9 41 F t a 227 5 Lo 5 2 58 2 i w 2 2 3 5 625 626 6 5 l a a mE 2 pri 5 aw 1 Ee ME 51 _ 632 e c Mui a MuR DET Bie 4 23 S TA 2 wel e 3 U XZ in you A ie ws ao Om s 3 2 Cs E i lei E a a S 5 aa ros 1 4 4 RIR RYR 4 2 I DN 1 3l 2 16 s 8 S 4 15 8 i 3 e a 3 is Bal i i le E if 3
31. 55 ARCEM UICE tior 2i 7 NOTE ONLY ON 109 _ VERSION a 010 BANDPASS FILTER J 01 6 des Me 14 tpis 2 NS E E itum a m i 3KHZ FLAT FILTER gt ae a ah 5 Jb 22 PUES I 1 i I R54 R36 527 837 R44 96K 18 8K 81 18 8K 15 8K Vente i sce rci o EE oss va ISKHZ FLAT F 1 LTER w V 104 l 19 0l NR SEE HERE i FE TPI5 5 u R84 1 Oe Rizs mae n 6190 5190 b L Codae E EAEE 5 Sa as C103 2 Cts 158 2UF e 2UF PES H UNE 1200 0 1 s re ele REN 14 quendi a eee wee E pata L hs 10140 Q 1023 50 KILOBIT FILTER a U U U u HZ 14 12 124 Sane e 8 32 NOTCH 2 RI67 NOTCH 3 163 2400PF Riss 4 000 R166 LIK 49 146 120 O t t 4990 140 158K 01 di Cu RI39 9140 P Ga a 4120 4120 5 RIA4I RI42 C126 i 2210 2210 n jae 22 6 i R143 dica t 2
32. CMOS 4 TO 16 LINE IC PRECISION GEN PURPOSE VOLT REG IC TIMER CMOS IC TIMER CMOS IC LCH CMOS CLOCK QUAD IC LCH CMOS COM CLOCK QUAD IC BFR CMOS LINE DRVR QUAD IC PRECISION GEN PURPOSE VOLT REG IC GATE CMOS NOR QUAD 2 INP IC GATE CMOS NAND QUAD 24 IC GATE CMOS NAND QUAD 6 INP FF CMOS D TYPE POS EDGE TRIG DUAL GATE CMOS NAND QUAD 2 IG GATE CMOS NAND DUAL 4 INP IC AMP LOW BIAS H IMPD 8 DIP P PKG IC OSC ECL IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P COMPARATOR GP QUAD 14 0 PKG IC LCH CMOS COM CLOCK QUAD IC LCH CMOS COM rock QUAD LCH CMOS COM C K QUAD IC LCH CMOS COM CLOCK LCH CMOS COM CLOCK QUAD CNTR ASYNCHRO IC CONV 10 B D A 16 DIP C PKG IC ADDR TTL LS BIN FULL ADDR 4 ADDR TTL LS BIN FULL ADDR 4 BIT IC ADDR TTL LS BIN FULL ADDR 4 BIT IC ADDR LS BIN FULL ADDR 4 BIT IC ADDR TTL LS BIN FULL ADDR 4 BIT IC MULTIPLXR 4 CHAN ANGL DUAL es DIP P IC OP AMP H SLEW RATE 8 DIP P PKG See introduction to this section for ordering information Indicates factory selected value Replaceable Parts fr Part umber 0757 0180 1 1 4 1 8 0 2151 9033R C4 1 8 10 3161 F 0698 8827 C4 1 8 10 1002 F C4 1 8 T0 51R1 F 4 1 amp TO 1002 F 4 1 9937 993 MF4C 1 CEA 9937 0698 8827 104 104 104 104 1251 6947 9100 2647 0360 0535 0360 0535 0360 0535 1251 6947 1251 6947 1251 6947 1251 69
33. Manual Changes Figure 7 7 A4 Transmitter Board Component Locator Manual Changes Model 4935A P O REAR POWER SLPPLY SECTION N TS 16 EE s CROWBAR OVERVCLTAGE PROTECT CIRCUIT ADJ VERE TUER Ce CRIB CR20 Meter CRI SENSE UY 8959 I 5 Rao pa 4 1 L i 19 R36 1 oe HERUM NE M 1000 30 sk Ie ES py gt Saas m i se T bau Z s Z Z s hy 14 C62 2 2 PART OF 2 MINOS 34032 SENSE R2 BIO REAM gut cnm ctr uc EN al LOK PANEL ASSY 15 Figure 7 8 Partial Power Supply Schematic 7 1 Model 4935A Manual Changes ite TPR IPH MED a En PN Par E e e dagen W S 4 oid ed i 43 n LP eR TED m 5 2 4 z ES 4 E a CT V5 4 i zs lt i T i 9 le v 50 ds a isis d 9 9 iw N ud i won ho 42
34. TOOPE ER elay C50 6008 Nu 2 14 1200P 1200827 ee 5008 92 G CT3 ee 4008 RI RTS 0 1 14 3008 TA 3283 3288 M R9 RT2A uas 14 2008 1248 1248 R62 nes 0 1 pog 21 4 6 3 02 I m 1008 2 4 pas 52 T 2 5 P70 r gt 008 T ARNG Wd 4 Era d i 100PF priu 4 V 2 s i UTE p sa E 13 i4y R4e RCV J ot 14 14y EE gt TO MONITOR SPEAKER NOTE Ji 13 MOT TEES ms gt awe lt qmm lt rum lt Suni du u LL onn P TO A4 TRANSMITTER t 1 1 1 e i 4 UA d n 27 rie MES 5 4 6 1 PE alice 1 5 3 i 2 Qo 00 4 2 81 ___0 ai Cee The 5 CRI 2 LEVEL 29 Lo 11 m C 902 SHIFTER a2 02 1 1 E RE 1476 PERA 3 IT I a he Figure 7 12 A3 13 Receiver Board Schematic 2 of 2 7 23 7 24
35. i TPT 3 4 12 3 1 4 I 4 7 10 9 12 9 5 3 big 8 9 10 10 I _ Doc 6 6 7 c57 e Panta ajs 5 5 2 U 716 7 2 UE alia 5 JWS NOT LOADED Figure 7 4 14 Transmitter Board Component Locator 7 15 Manual Changes Model 4935A a Ra ee ea PHYSICALLY CLOSE TO 140 Figure 7 5 A4 A14 Partial Schematic Mee 2 ta t i ie f s 252 ie md jo 41314134018111212 t5 272 Er CA se Be a i i i 1 se gos s Z 2 lt 4 ES H H M Pi mi 13 H A a 5542 E PE 2 ku d amp i f 114 7 67 6 i E 4 PES MEE pei TRI j 1 4474 f ran c bou gt 1 i e Ls 2 4 4 ag OES Ey 7 23 i CE i yi 4002 ET 4 E 2 8 ch PN vat i 4 4 E 4 Ku i al i 1 Writ 4 5 2 Es pe i 21 L3 4v 5 ni no 3 E k 4 y nic i lal
36. sS ut u 8 49 AUIDO E 6 49 Detector Troubleshooting 8 50 Impulse Noise Circuitry 8 50 Charger Board Troubleshooting 8 32 Proc eu u ayau io 8 52 Charge Circuitry Charge Inhibit CIO 8 52 Section 8 259 8 261 8 263 8 265 8 267 8 268 8 270 8 272 8 274 8 276 8 278 8 279 8 282 8 283 Title Page Relay Drive Circuitry Low Voltage Inhibit Circuitry 8 53 Inhibit Circuitry and LOW Voltage aan 8 54 Delay and Relay Drive Circuitry 8 54 Low Voltage Inhibit Troubleshooting 8 55 Service IUS 8 57 Service Selection of Input Notch Filter 25dB Amp 8 57 PIOCCOULE 8 57 Service Selection of Noise Filters oe en 8 58 POCCCUGC 8 58 Service Selection of Autorange Gain for Service 8 58 an ua as 6 58 Hand Selection of A3C57 and 160 A3C57 and A3C160 for Units for Desired Frequency Response 8 59 Hand Selection of C57 and 160 8 60 Filters Response of Each Stage 8 60 Vil Table of Contcnts Mo
37. 00 3 58 010 162 i5 M ed ae necis azi 569 oly 053 25 5 za 6H 9 692 i 2 asi 468 r9 870 M 18 968 za 8 99 29 9H 59 9v2 ace s alal 8 0 ved za 59 Svo 4 a iz gt E 08 59 s sE 68 d Ero ooo 89 Zu 9 92 2 s st eg tg 5 9 gt _ _ _ sr lau 10 00 Tim aaemhr or 90 3 3 eco 777 1 a 3e eR 15 5 55 855 wij ej z 11 Vs si EE ls el s e ia sr 828 oro 269 fel oy 2 S ia 0i 7 js ee ti 0 2 9 2 8 il H iD i i gt 92H 53 S Bailey le n4 Lees urge Sa 018 ID fa 75 gt REX 4 oa Ei ES 5 9 gen pid ry Ld 4 eto i 4 PL 8 9 ien 8 5 Par 252 i 1 1 9281 S 9 Ss 99 59 ie abs zi p i ls IDE 9 9 ren 63 ea 622 WA abn 5 si Je 4 771 7774 99 922 ALL z z ei amp 08
38. 0698 8826 0698 8824 RESISTOR 562K 1 125W 0 100 0698 8824 0757 0442 RESISTOR 10K 1 t25W F TC 0 100 4 1 8 0 1002 0757 0465 RESISTOR 100K 1 125W 0 100 4 1 8 0 1003 0698 6360 RESISTOR 10K 1 125W 0 25 0698 6360 0698 3440 RESISTOR 196 1 125W TC 0 100 C4 1 8 T0 196R F 0757 0465 RESISTOR 100 1 125W 0 100 0757 0280 RESISTOR 1K 1 125W TC 0 100 0757 0442 RESISTOR 10K 1 125W TC 0 100 0757 0442 RESISTOR 10K 1 125W TC 0 100 0757 0442 RESISTOR 10K 1 125W F TC 0 100 Scc introduction to this section for ordering information 7 54 Indicates factory selected valuc Model 4935A Reference Designator 4823 A4R24 A4R25 A4R27 A4H28 A4R29 A4R30 A4R31 AAR33 4834 4935 A4R36 AAR37 A4R38 A4R39 4 40 A4R41 A4R42 A4R43 A4R44 A4R45 A4R46 A4R47 A4R4B A4R49 A4R52 A4RS3 A4R54 A4R55 A4R56 4957 4858 4859 4560 4861 4962 AAR63 4964 4865 4966 4867 4968 4869 A4R70 A4R7 AAR72 4873 4874 A4R75 4876 4 77 A4R78 A4R79 4 A4R81 A4RB2 4883 4 92 4 93 A4R94 44R95 AARIG A4R97 A4R98 A4R99 44 100 Number 0757 0288 0757 0420 0757 0420 0698 0083 0757 0465 1910 0207 0757 0465 2100 3882 0757 0416 0698 0083 0757 0442 0757 0394 0757 0317 0757 0420 0757 0420 0757
39. 7 36 Receiver Board Schematic Diagram Sheet 2 02 1 37 A4 Transmitter Board Component lbs eire TR 7 38 Transmitter Board Component brat ote 7 39 A4 Transmitter Board Schematic Diagram Sheet 1 of 2 7 40 4 Transmitter Board Schematic Diagram Sheet 2 of 2 1 41 A5 Charger Board Component Locator 7 4 2 5 Charger Board Schematic Diagram 7 4 3 4935A Main Block Diagram 8 1 Voltage to Frequency Conversion Characteristics seier UR NR DR n EHE IAE 8 7 Voltage to Frequency Conversion OULD UG 8 8 Frequency and Level Measurement TMG 8 9 Control Circuitry Block Diagram 8 11 Receiver Block Diagram 8 14 Switchboard Block Diagram 8 15 Input Output Switching 8 16 Filter Block Diaeram 8 17 Autorange Block Diagram 8 18 Stair Step Sinewave 8 20 Transmitter Block Diagram 8 21 Power Supply Block Diagram 8 23 Charger Board Block Diagram 8 25 Instrument Troubleshooting 8 22 Stair Step Sinewave 8 39 Section 8 19 8 20 8 21 8 22 8 23
40. CER 28480 0160 0576 A3C143 0160 0576 5 CAPACITOR FXD 1UF 2090 50VDC 144 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER A3C145 0160 0576 5 CAPACITOR FXD tUF 20 50VDC CER 08113 HP204751PF3C1 A3C146 0160 6405 1 CAPACITOR FXD 010 1 100VDC MICA 28480 0160 0576 A3C147 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A3C152 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER A3C153 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 4 154 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 2215 155 0160 2215 3 CAPACITOR FXD 750PF 5 300VDC MICA 02367 CD15FC431J01 A3C156 0160 0939 4 CAPACITOR FXD 430PF 1 300VDC 56289 150D225X9020A2 A3C157 0180 0197 CAPACITOR FXD 2 2UF 105 20VDC 7 48 See introduction to this section for ordering information Indicates factory scleeted value Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued Mfr Part Number Reference HP Part Designator Number D Description CAPACITOR FXD 2 2UF 105 20VDC 1500225X9020A2 CAPACITOR FXD 1UF 20 50VDC CER 0160 0578 36160 CAPACITORLEXD TUE 20 S0VDG CER 20 0160 0576 A 90 CAPACITOR HAND SELECTED ONLY IF NEEDED _ DIODE SM SIG 5 1901 1068 ADU DIODE SWITCHING 30B 50MA 25 0 35 1901 0040 A3CR4 0811 3587 ft Le
41. Oe s s ee A IV U Ines a pe ee x Z in le P T T pc RE a J w vsu 2212 3343 90009 78967 HITA 28 4d3 i333M NT 20809 6660 141357 T2968 1 _ a a3esa 3654 RECEIVER 0 04935 60004 AND Ai3 RECEIVER WITH 04935 50008 SERIES 2102 _ _ ys eet EM Tf a eee F a a a v H ALTC i r 2 aa lt lt I P O 4 i Fle aR 271116 14 l U u sa A b amp 3 01 ee 06 T 1 05 04 4 m I 04 I l 45V 1 4 ciie 0 1 144 1 i FROM 133 4 s 0 IO a 22 Y caio 1 1 LOK cazs Y I cR26 Y FROM 4 TRANSMITTER Rrra R92 1 EN i 5 ANALOG SWITCHES ARE DRAWN AS THEY WOULD BE WITH A LOGIC 1 ON THE CONTROL OUTPUT NN NE M C ee 1 gt wie a CU
42. ag R b 1 2 E As 4 14 i 2 13 Y 2 33 70 2 k 12 3 3a 3 5 E 4 37 4 5 IO 5 38 5 u 5 6 6 U 35 6 2 4 7 6 34 33 8 9 32 9 10 3 10 11 30 2 E 8 12 gt 13 4 1 4 2 7 SA 2 DE 5 15 26 R29 20 5 5 TP 4 6 16 25 e 2 19 5 CLK 2 i I C 7 17 24 a 3 e d 18 23 4 U fir lt Rin R E 22 5 1 tie DANOT LORDEDI gt 3 BE 20 ___ 2 o9 3 15 OQvu PAR SINE e 4 16 5 2 Das 2 ja C LK CLK alle 3 14 6 13 9 2112 C 1 14 I 45 7 BE 1 2 3 3 2 13 2 as c A 3 2 3 U lie 2 9 4 FI 4 2 3 9 5 5 3 12 eee id dai eo 8 9 6 CTA R42 d 7 10 5 ADJ Juss GND JUMPER WIRE eee 0 I 5 I6 16 2 2 15 2 2 I5 2 E 3 3 x 3 3 I 3 14 4 4 7 3 4 n 5 5 12 5 5 fiz 5 12 I 6 6 11 6 6 5 3 7 ID 7 7 10 5 J a 9 8 a oje al 9 3 7 164 7 2 16 if i if 2 15 2 15 2 2 15 2 2 3 14 3 14 3 3 14 5 2 4 4 E 4 5 3 4 4 7 13 4 4 5 12 5 12 5 5 12 5 6 11 6 11 6 6 406 7 7 IG 7 7 7 8 9 9 8j 9 8 I m ig 4 e if leo if S eso 5 2 19 2 9 6 ET 3 18 3 a 7 y 5 A g 3 3 a V4 5 16 5 6 ja 1 ss d ga
43. 8120 1860 Straight 22 VI Systems Cabinet use Straight BS 546 SABS 164 90 So Africa India 8120 4604 8120 4211 N N N CO cO cO Part number shown for plug is industry identifier for plug only Num er shown for cable is HP Part Number for complete cable including plug E Earth Ground L Line N Neutral 2 3 2 4 blank Model 4935A Operation SECTION OPERATION 3 1 INTRODUCTION 32 This section contains information front and re ir panel features self check procedures and error codes Err codes Also covered are the principles of operation for all measurements If any of the automatic self check procedures fail acceptable limits as specified in the checks then adjustment or repair may be necessary 3 3 SELF CHECK 4 4 check procedures are performed automatically at power up by the instrument Most of the major circuits are checked and any problems are identified Self check does not verify performance specifications Performance checks verify that the instrument meets published specifications Failure of the instrument to pass any self check procedure indicate a malfunction that can possibly affect other measurements 3 5 ERROR MESSAGES 3 6 W hen the 4935A is powered up the instrument automatically transmits a signal into its receiver through thr filters The signal is checked after each filter to verify that it is within acceptable limits Err
44. T 151 R75 1210 NOT ALLY R76 RCV R77 500 1 2 N E eee Bee z 14V R53 pe 301K T _ 414 11 C40 wn 082UF CRIS 16 R51 i cae L NOTE 5 1 96K Qum 2 us 14 ode ci V E CD lt NC M MM M 4935 60035 REV A SERIES 2822 38 C15 0 1 6 1 C18 100 C57 1500PF R75 1 1 1210 5199 NOT NORM ALLY LOADED R76 2150 GAIN R77 500 12 nud 2 14V C55 0 1 11 5V 1 927 C54 16 0 1 4 1 3 L ud 5 9 10 13 NOTE 5 N 15 ith 14 C53 25 0 1 JUS roc ES 14V TP14 C76 l 0 1 45V 12 11 1 3 285 9 9354 10 15 14V NOTE 5 5 ANALOG SWITCHES ARE DRAWN AS THEY WOULD BE WITH A LOGIC 1 ON THE CONTROL INPUT __ Iq R54 196K C19 0 01 15 C157 C158 2 202 2 20 FZ7 995 298 16 9K 45V 1 P O R20 100K EA R99 12 918 14V NC NC NC NC 121 11 10 9 6 7 8 NC NC NC NC M A me Heli EE r r r M po oec geo ee 7752 541 po eem memo eem ge 14V 2598 AMP BUFFER AMP C78 5 aoe
45. x E fai 16 2 I 2 SS ad Boa wu 2 s 5 i Ties 4 5 4 n ay 4 5 3 un J 5 9 r gt d Usu S 1 84 45 ity x gt Sort in fy 2 5 EN t ay RYT i 4 w I 14 1 x x Sau i il ake et 4 Lo ae A13 P AR Receiver Board Component Locator 7 11 Manual Changes Model 4935A Model 4935A Page 8 69 Figure 8 29 Receiver Board Schematic A13 Ground the case of 1 located in the upper left corner of the schematic Page 8 71 Figure 8 30 Receiver Board Schematic Page 2 of 2 Change PAR A13 section of schematic to the following s R24 ERIO 383 gt gt gt 4 gt Re 2 R25 2 5785 E RIBS PEAK LATCH i PAR OPTIONS OOI 003 ONLY OFT 1 HL en eae J CHANGE 14 Page 6 17 Table 6 3 Replaceable Parts Change A4CR7 to 1902 3214 DIODE ZNR 16 2V 2 4 CD 6 CODE 28480 P N 1902 3214 Page 6 18 Table 6 3 Replaceable Parts Change A4CRI5 to 1902 3214 DIODE ZNR 16 2V 2 4W CD 6 MFG CODE 28480 P N 1902 3214 Change AJCR23 to 1902 3214 DIODE ZNR 16 2V 2 4W CD 6 MFG CODE 28480 MEG P N 1902 3214 Change
46. 9 1251 6947 10 12515947 11 1251 6947 12 1251 6947 13 125 6947 14 1251 6947 15 1251 8947 21 1251 6947 22 1251 6947 23 1251 8947 24 1251 6947 A3TP25 1251 8947 OO c See Introduction to this section for ordering Information Indicates factory selected value 6 16 Model 4935A Best signa 1826 0712 1826 0138 1626 0624 1826 1071 1826 0742 1820 2326 182 J 1315 1826 1544 1826 0667 1826 07 12 lea 1956 1826 1071 1826 0735 1826 0735 1826 0208 1826 0735 1826 0665 1826 0712 1826 0208 1826 0740 1826 0740 1826 0665 1820 1725 1820 0735 1820 1725 1826 0753 1826 0736 1826 0667 1826 0687 1826 0667 1826 0712 1826 0753 826 1544 1826 0735 a aaO G 00 00 Com OO Q Uh O Description OP AMP LOW BIAS H IMPD DUAL 8 DIP P IC COMPARATOR GP QUAD 14 DIP P PKG CONV V FREQ 14 DIP P PKG IC OP AMP IC PRECISION 10V REFERENCE AD581J CONV 8 E D A 160DIP P PKG IC LCH CMOS COM CLOCK QUAD IC LCH CMOS COM CLOCK QUAD IC LCH CMOS COM CLOCK QUAD IC XLTR CMOS TIL TO MOS HEX MULTIPLAR amp CHAN ANLG 16 DIP P PKG IC OP AMP LOW BIAS H MPD 8 DIP P PKG OP AMP LOW BIAS I I IMPD DUAL S DIP P IC LCH CMOS COM CLOCK QUAD IC OP AMP IC OP AMP
47. RE IPPON SIMS P O P1d 38 10K NOTE R35 CASE TIED TO SUPPORT OUTPUT LEG OF OUTPUT LEVEL POT LEVEL THROUGH WIRE TO GROUND PL 35 SETUP SHIELD TIP at _ 2 SPARK 310 P se LEFT p M SHIELD ESTE 52 0 SPARK RING nis RIGHT pp FP FRONT PANEL GND NOTE SWITCHES 82 amp 53 DRAWN IN NORM POSITION P O P1 FROM A4 A14 TRANSMI TTER ASSY ASSY 04935 60027 REV 2642 38 O NOTE R35 CASE TIED TO SUPPORT OUTPUT LEG OF OUTPUT LEVEL POT THROUGH WIRE TO GROUND PLANE TRMT RCV SPARK CR ER NOR eni TRMT 2 510 to CEN 5 4 P SPARK GAP SETUP E di SETUP 2 5 TRMT ON IN ae i 4 OUT HOLD IS S2 amp 3 DRAWN GN IN 4 POSITION 2 g R71 071 100 E RAO 100 1 C72 gt 1 6 9 0 01 6 9 _ C77 0 1 C73 0 68 0 1 RCV HOLD CURRENT RECEIVE HOLD CIRCUIT _ Uer der Lr J329 99 2 fre Al 9 34 tra X Is re M ON IN 5 4 2 TRANSMIT HOLD CIRCUIT 4 R51 1M R56 Q51 100 hs R60 100 C56 CR51 0 1 0 01 EN XMT HOLD 10 TP4 CURRENT a
48. i Wey 40 nd nod Ag 4 Figure 7 9 A13 P AR Receiver Board Component Locator 7 19 Manual Changes Model 4935A h 1 i T fo LE epee M 4 ni x 14002 4 a 4 2 2 2 15 98 2 Ing fod 15 e f 2 5 i GNO 4 b Re 6 5 41 5 7 1G N LENS N JUMPER WIRE i JE m 3 298 26543 _ f 9 j i 14 POS SHUNT gt i oe 7 0 OV 1 poA n pl 76 lt gt E 2 i 2 ae 22415 2 15 2 u 41 ne jia 4 4 14 2 03 4 5 0 5 gt 5 i 4 Bg 5 2 51 F j e 6 5 Fg i MEM Jy r iu 7 lu 1 al E 2 4 4 ly 9 29 8 19 4 Q3 F SA R2 poer RES 6 I wv 1 Pu 10 SET A px 404 3 H 2 6 i amp 2 t x di 7 1 unn du omm 2 AEN L 4 amindaj C TE E AP 4 4 3 M de
49. s 04935 60029 REV R 2640 38 4935A TK8 88 4935 29C M1 a lt 219 2 19 W 9 f pe d Model 4935A puo mm FV T H8 5 BATTERY CHARGE BOARD 55 04 14V TP 1 x 7 VOLT REFERENCES his ee Gee es ee J4 F2 1 5V 2 NC 4A CR30 42 F1 14 2 1 3 2 14 14V n P O 41 5 AC LINE SUPPLY FROM A4 14 1 414 AC LINE SUPPLY TRANSMITTER 2 14 AC LINE SUPPLY ASSY 5 r CHARGE INHIBIT HEAT 5 19 HEAT SINKED CR26 514 Y _J lt CR3 Tru Euri HIBIT idR 2370 iue CR14 11 R40 17 SY E ire 22 NOTES 1 REFERENCE DESIGNATIONS WITHIN THIS ASSEMBLY ARE ABBREVIATED ADD ASSEMBLY NUMBER ABBREVIAT ION FOR COMPLETE DESCRIPTION 2 UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE MICROFARADS INDUCTANCE IN HENRIES 5VAC LINE SUPPLY 5 18 5v UNREG FROM BATTERIES OR 14 LINE SUPPLY 5 14V UNREG gt UNREG VOLTAGES 14 LINE SUPPLY 14V UNREG XMIT 4 A14 REGULATORS CHARGE INDICATOR CHARGE iNDICATOR ON OFF
50. 0 25 RESISTOR 10K 1 125W TC 0 25 RESISTOR 10K 1 125W F TC 0 25 RESISTOR 15 758 1 125W F TC 0 25 RESISTOR 2 26K 1 125W TC 0 25 RESISTOR 2 26 1 125W F TC 0 25 RESISTOR 10K 1 125W F 0 25 RESISTOR 10K 1 125W F TC 0 25 RESISTOR 21 5 1 125W F TC 0 25 RESISTOR 13 665 1 125W TC 0 25 RESISTOR 13 665 1 125W TC 0 25 RESISTOR 108 502 1 125W F TC 0 25 RESISTOR 140 198K ARR EN TC 25 RESISTOR 11K 1 RESISTOR 1 Nik 1 01 25 RESISTOR 10K 1 125W 0 25 RESISTOR TRMR 5K 10 TOP ADJ 17 TRN RESISTOR 1K 1 125W F TC 0 100 RESISTOR 825 1 125W F TC 0 100 RESISTOR 1K 1 125W F TC 0 100 RESISTOR 100K 1 125WF TC 0 100 RESISTOR100 1 125W F TC 0 100 RESISTOR 16 9K 1 125W TC 0 50 RESISTOR 51 1K 1 125W TC 0 100 RESISTOR 100 1 125W TC 0 100 RESISTOR 51 1K 1 125W TC 0 100 RESISTOR 100 1 125W TC 0 100 RESISTOR 5K 196 125W F TC 0 100 NETWORK RES 6 SIP OHM X5 RESISTOR 8 838K 1 125W F TC 0 25 WIRE 1 2 IN RESISTOR 0 OHMS TRANSFORMER WWER 100 120 220 240V genes Model 4935A r Part umber 0698 8858 NESS MF4C1 8 TO 6191 F MF4C1 8 T0 6191 F 098 64 NC4 1 8 T2 4422 D 0698 4537 0688 7585 2100 3883 0698 6360 0698 6360 06 C4 1 8 10 2873 F 0699 0596 1 8 2 1072 MF4C1 8 T9 4991 C 0699 0597 0698
51. 0 100 RESISTOR 14 7K 1 125W 0 100 RESISTOR 3 48K 1 125W 0 100 RESISTOR 51 1K 190 125W 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 31 6K 1 125W 0 100 RESISTOR 1K 1 125W TC 0 100 RESISTOR 51 1K 1 125W TC 0 100 RESISTOR 133K 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 825 1 125W 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 11K 1 125W 0 100 RESISTOR 8 25K 1 125W TC 0 100 RESISTOR 081 1 125W TC 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR TRMTF 50 10 TOP ADJ 17 TRN RESISTOR 3 16K 1 125W 0 100 RESISTOR TRMR 2K 10 TOP ADJ 17 TRN RESISTOR 10K 1 125 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 10K 190 125W TC 0 100 RESISTOR 31 6K 1 125W 0 100 RESISTOR 31 6 1 125W F FC 0 100 RESISTOR 1 62K 1 125W RESISTOR 2 43K 1 125W RESISTOR 2 5k 1 125W F TC 0 100 RESISTOR 585 1 125W F 0 100 RESISTOR 31 6 1 125W F 0 100 RESISTOR 1 125W F TC 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 51 1 1 125W 0 100 RESISTOR 10K 1 125W TC 0 25 RESISTOR 2 37K 1 125W RESISTOR 1K
52. 2 2 66 2 2 DP 7 16 Figure 7 6 14 P AR Transmitter Board Component Locator Model 4935A i 14 Si is 7 8 9 11 i2 13 114 15 i iF 17 IH 19 212 2 2 23 24 25 26 27 28 29 33 55 36 57 38 39 41 42 45 194 45 4h 4 4A 4 1 4 i 4 R R MU B cA Me 0 ES m AN TH R93 ig c i I h 2 I 3 ja E 3 i L 4 4 U l 4 4 2 2 4 4 5 5 4 I A j V Fe QM 2 HS 2 jes na 4 il i 4 u s 4 dia 9 dz 5 h2 3 ug TE amp 0 Bel io WO 4 8 5 TP20 Nea E MA pa 2 2 13 x 12 3 12 527 u u p 4 I 4 5 In 8 10 NES 6 i 7 gt O 1 6 19 ja vt 3 z a x 16 15 C32 GERE 2 I a a 4 4 5 y 43 X X age 5929 Cain n 003 VLA E mo PWN I 2 4 3 6 2 i Y H 2 T 5 is 1 41 5 41 5 6 d 18 b 10 V i 15 12 14 EI uo 3 r4 15 16 1 19 18 19 4 13 13 2 1A 12 U 12 81 I 8 5 el E 1 SA gt gt GN
53. 9 v REF 4 1 ORMS DET 1 Foi PEAK ee TUS CONT saq a Lu 0 AVE DET px eet HIGH THRESH Figure 7 26 Receiver Board Schematic Diagram Sheet 2 of 2 7 37 1012207 peog 12 6 4 194 gt v8p22 7 535 50 99 556 isn 2 0 Sin 109 Stard 6 4 een sin 63 vin 9 zzn 8 H zin gt 163 t2 a r 068 Z oin 5 4 zr Bas i RS H n lv e z von ei 2 eu i Zr i i 2 vn E i ep i rg sij git 15 e r 2 zd wh i X iH i s jbj 1 3 ru 2 295 x a pa La 62 5 192 t gt i 9 3 i 2 2 H 792 i NL ora ozy 39 62 62 230 9 n a M ail re itd TH 950 i un 18 E M oid 3 6 2 ig ls 3 Yo S ci Peay 9 8 M 59 555 fol sis 242 si gi
54. A a 7 8 7 iue 42 yx l i UT om ELT 73 15 eadi k M i REV GND nr au Eus iow ox m qeu GNO C4 gt 5 NN NI amp rris RS e D RS Be RE 5 15 a 359 6 pg WS 7 n DUA men S i 7 5 TE i NOH i NC xo t wre E s A r Cris 14 kan E t C 5 i Hy 8 2 a XA 427 Z L3 i 5 gv 191 9 2 lt i vod m o cuo E 952 V gn U t 2 rN VEE j 9 E 2 2075 2 RYR i 8 71 4 ga 5 gt zi 5 i po 8075 dapi rs i ZLA 55 ELLO Je Be T Shia a FRA TRY 26 25 1 ON i d 7 23 bs 14 REAR EN uw alli HS g 6 8 9 7 8 8 22 21 N E 600 20 9 PR cede E C A 6 115 ace A na 4 jg 13 vu ES 81 9005 900 ij 2107 ots Ux er os c abun n a 7 a 5 N
55. IMP PEAK PCS ec a E 5 BATA ae a ats ir M M i QRMS DETECTOR i 73 vl 944 P dd ay i d CJs T 10 Ww y 4 A m VV V sul lt j J pe d 7 7 432 4 Si QRM3 m ee es e a a 831 gt PAR PEAK 1 P P GNDEO iN GRA V 830 STO UNT 6 id 44 LEN ide m EU oe gt 28 9 10 2 E E i oe HI DL qul ON cM MEL RM rege 731 tisy i C21 R48 R38 ga 4840 2370 1160 gt Tine ee S to 100K a i C32 E PEAK LATCH OPTIONS 001 003 N ol ae aS a 23 eS ee ea ges BP 222 r 1 _ ERE te ae Manual Changes 7 ss U t KHZ LPF H mS i 16 46 41 AO i
56. hA O ss yC OF Did Era sia E i 1 T ER d M E ICE Lager s T i i p d ADRS MOLINO idi il i i i 1 1 rm 1 j 1 e aie 4 Po 1 1 na 3941803 MO 21901 36 EHI 4 ET i 2704 LINL SY NAYWO ANY 638421145 DOTYNY il t am A 49m iat A sho pe 5 Em i l i ot i ii n i jud mon n E 4 t i i H 1 i 1 94 EI asw awa A is H 1 im ono aw Me out ee s ie m ad al 00 440042 1 212 o 4 4 2 fu Y 9 d 1 i age AH or i 14181 ax i i z 2 412 zz i i r 440011 4 i 14 Im r n i Wira y I i Abis amp ai M ka i i i i t 5 m 2 z i a E AM eee EN
57. 1 125W 0 25 0698 6360 A13R151 0699 0590 4 RESISTOR 15 758 1 125W 0 25 0699 0590 A13R152 0757 0462 3 RESISTOR 75K 1 125W F TC 0 100 C4 1 8 TO 7502 F A13R153 2100 3884 0 RESISTOR TRMR 10K 10 C TOP ADJ t7 TRN 2100 3884 13 154 0698 4520 6 RESISTOR 43K 1 125W 0 100 C4 1 8 TO 1433 F A13R155 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A13R156 0598 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 138157 0698 4505 7 RESISTOR 71 5K 1 125W 0 100 C4 1 8 TO 7152 F A13R158 0699 0597 1 RESISTOR 2 26 1 125W TC 0 25 0699 0597 A13R159 0699 0597 1 RESISTOR 2 26K 1 125W 0 25 0699 0597 A13R160 0698 6360 6 RESISTOR 10K 1 125W F TC 0 25 0698 6360 A13R161 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 138162 0698 8799 9 RESISTOR 21 5 190 125W TC 0 25 0698 8799 A13R163 0699 0593 7 RESISTOR 13 665K 190 125W 0 25 0699 0593 A13R164 0699 0593 7 RESISTOR 13 665 1 125W 0 25 0699 0593 13 165 0699 0600 7 RESISTOR 108 502 1 125W 0 25 0699 0600 A13R166 0699 0591 5 RESISTOR 140 158K 190 125W 0 25 0699 0591 167 0757 0443 0 RESISTOR 11K 1 125W TC 04 100 4 1 8 0 1102 A13R168 0698 4520 6 RESISTOR 43K 1 125W F TC 0 100 C4 1 8 TO 1433 F A13R168 0757 0461 2 RESISTOR 68 1K 1 125W TC 0 100 C4 1 8 TO 6812 F A13R170 0698 6360 6 RESISTOR 10K 1 125W TC 0 25 0698 6360 A13R171 0698 6360 6
58. FREQUENCY TRANSMITTER Use MEAS key to select LEVEL FREQUENCY Press DISPLAY TRMT key to display the transmitted signal TRMT light is ON eve can be read in the left display and frequency in the right If SF signalling units are used on the circuit under test press SF SKIP key to turn on SF SKIP When the light is on the transmitter is blanked from 2450 Hz to 2750 Hz or 150 Hz around a stored SF SKIP frequency SF SKIP frequency is preset at 2600 Hz Skip will be 2600 Hz 150 Hz The SF SKIP center frequency can be changed by putting the desired skip frequency into the transmitted frequency display Then press the STORE key and the SF SKIP key He sure to disconnect the transmit side of the line from the test set first to avoid dropping the circuit during the storage procedure Turn OUTPUT LEVEL knob to adjust the level of the transmitted signal to DATA LEVEL DATA LEVEL is usually 13 dB below the transmission level point TLP sign indicates the level is gt 13 sign indicates the level is lt 40 dBm Use the STEP UP and STEP DOWN keys to set the desired frequency or press F1 F2 F3 or F4 to recall any stored frequency Holding a finger on either the STEP UP or STEP DOWN keys causes the transmitter to sweep STORE and Frequencies There are 4 frequencies stored in locations F1 F2 and F4 when the 4935A is turned on F is 404 Hz F 15 1004 Hz F3 is 2804 Hz and 15 27 3 Hz To store
59. 104 A3CR5 1901 0040 DIODE SWITCHING 30V 50MA 2NS DO 35 1901 0040 A3CR6 1901 0376 DIODE GEN PRP 35V 50 35 1901 0376 A3CR7 1901 0376 DIODE GEN PRP 35V 50MA DO 35 1901 0376 A3CRB 1901 0518 DIODE SCHOTTKY 5082 5509 A3CR9 1901 0518 5082 5509 A3CR11 1901 0518 DIODE SCHOTTKY 5082 5509 5 41 DIODE SWITCHING 80V 200 2NS DO 35 901 0050 i3 copes DIODE SWITCHING 80V 200MA 245 DO 35 1501 0020 A3CR15 1901 0518 DIODE SCHOTTKY 5082 5509 A3CR18 1901 0518 DIODE SCHOTTKY 5082 5509 A3CR26 1901 0050 DIODE SWITCHING 80 200 2NS DO 35 1901 0050 A3CR27 1901 0050 DIODE SWITCHING 80V 200MA 2NS DO 35 1901 0050 x CONNECTR RF SMB M 50 OHM 1250 0257 324 1251 5063 CONNECTA G ree 1351 5063 B SOCKET IC 16 CONT DIP DIP SLDR A3JU1 1200 0473 1200 0473 1251 4398 SHUNT 4 POSITION 12251 4398 A3JUA 1200 0473 8 SOCKET IC 16 CONT DIP DIP SLDR 1200 0473 7 1258 0141 5 JUMPER REMOVABLE FOR 025 IN BSC SZ SQ 1258 0141 2 RESISTOR 10K 1 125W TC 0 100 4 1 8 0 1002 Mice pu RESISTOR 10K 1 125W 0 100 C4 1 8 T0 1002 F A3R3 0698 4465 RESISTOR 931 1 125W TC 0 100 C4 1 8 T0 931R F 4 698 6393 RESISTOR 585 1 125W 0 25 0698 6393 A3R5 0757 0280 RESISTOR 1K 1 125W F TC 0 100 C4 1 8 T0 1001 F RESISTOR 6 19K 1 125W TC 0 100 4C1 8 T0 6 pee 1 RESISTOR 6 19K 1 125W TC 0 100 2 A3RB 0757 0290 RESISTOR 6 19K 1 125W 0 100 1 8 0 619
60. 13 44 13 45 0180 0374 CAPACITOR FXD 10UF 10 20VDC CAPACITOR FXD 1UF 20 CER 1500 106X9020B2 0160 6623 0160 6623 A13C46 0180 0374 CAPACITOR FXD 10UF 1096 20VDC 150D106X9020B2 A13C47 0180 0374 CAPACITOR FXD 10UF 10 20VDC TA 150D106X9020B2 13 49 0160 7103 CAPACITOR FD 600PF 196 300VDC MICA 0160 7103 A13C50 0160 7099 CAPACITOR FXD 1200PF 1 100VDC MICA 0160 7099 A13C51 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C52 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C56 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C57 0160 2222 CAPACITOR FXD 1500PF 5 300VDC MICA 0160 2222 A13C58 A13C59 0160 7100 CAPACITOR FXD 1700PF 1 100VDC MICA CAPACITOR FXD 10UF 1096 20VDC TA 0160 7100 0180 0374 1500106 902082 13 60 0160 7098 CAPACITOR FXD 1100PF 1 100VDC MICA 0160 7098 A13C61 0160 7100 CAPACITOR FXD 1700PF 1 100VDC MICA 0160 7100 A13C62 0160 6623 CAPACITOR FXD 1UF 20 50VDC CER 0160 6623 A13C63 A13C64 0160 6623 CAPACITOR FXD 1UF 2096 CER CAPACITOR FXD 2 2UF 10 20VDC 0160 6623 0180 0197 150D225X9020A2 0180 0197 CAPACITOR FXD 2 2UF 10 20VDC TA 1500225 9020 2 0160 7100 CAPACITOR FXD 1700PF 1 100VDC MICA 0160 7100 0160
61. 2627 5 LF351N LF351N LF351IN LF353N MC34084P MC34081P IH504 3CDE SC77968L 1 MC34081P 2507 5 LF351N 1200 0473 1200 0473 1200 0473 ORDER BY DESCRIPTION ORDER BY DESCRIPTION 8150 0456 TCBS 4N Model 4935A Replaceable Parts Table 6 3 Replaceable Parts Continued Reference HP Part Mfr Part Designator Number Description Number A4 04935 60303 TRANSMITTER BOARD STD UNIT ONLY 04935 60303 AAC1 0160 3963 CAPACITOR FXD 15UF 5 50VDC MET POLY 0160 3963 A4C2 0160 3963 CAPACITOR FXD 15UF 5 50VDC MET POLY 0160 3963 A4C3 0160 3963 CAPACITOR FXD 15UF 5 MET POLY 0160 3963 4 4 0160 0576 CAPACITOR FXD 1UF 20 50VCD CER 0160 0576 A4C5 0180 3045 CAPACITOR FXD 2200UF 50 1096 25VDC AL 0180 3045 4 6 0180 2945 CAPACITOR FXD 100UF 50 10 35VDC AL 0180 2945 AACT 0160 0576 CAPACITOR FXD 1UF 20 50VCD CER 0160 0576 A4CB 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C9 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C10 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C11 0180 3045 CAPACITOR FXD 2200UF 50 10 25VDC AL 0180 3045 4 12 0180 2945 CAPACITOR F XD 100UF 50 10 35VDC AL 0180 2945 A4C13 0160 3456 CAPACITOR FXD 1000PF 10 1 CER 0160 3456 4 14 0160 0576 1UF 20 50VCD CER 0160 0576 4 15 0180 3044 CAPACITOR FXD 3300UF 50 10 16 AL 0180 3044 4 16 0160 0576 CAPA
62. 3 21 Component Locator 1 16 SORBIUPIUGE 3 22 7 7 A4 Transmitter Board Component 3 11 C Message Weighting with Notch LOC OL eee aus 4 17 ien etti asd 3 23 7 8 Partial Power Supply Schematic 7 18 3 12 Signal to Noise Measurement 3 23 7 9 P AR Receiver Board Component 3 13 Impulse Noise Waveform saus t a 7 19 Representation 3 24 7 10 A3 Receiver Board Component 3 14 Noise to Ground Related to Message eR 7 20 Circuit 3 2 5 7 11 Receiver Board Schematic 3 15 Transmit Signal Sheet 1 405 4 21 SPCC IDD bass CUR en 3 26 7 12 A3 Receiver Board Schematic 3 16 P AR Transmit Signal Envelope 3 26 Sheet 2 012 7 23 7 13 Receiver Board Component 4 1 Transmitter Flatness Test Clonal penne 1 25 FES D P EE oer 4 2 7 14 A3 Receiver Board Component 4 2 Transmitter Flatness Test 7 26 nes ott 4 4 7 15 Receiver Board Schematic 4 3 Reccivcr Test at 11 dBm Diagram Partial 7 27 40 a Rd 4 8 7 16 A4 Transmitter Board Component 4 4 Autoranec Test uuu na a aaa 4 10 OC ALOR uon 7 28 4832
63. OVERVOL TAGE JU 5 5V SENSE 45V P OJ3 i 14 CR25 xd 1 REFERENCE DESIGNATIONS WITHIN THIS 6 81V ASSEMBLY ARE ABBREVIATED ADD 5 ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTION 29 2 UNLESS OTHERWISE INDICATED NT CR26 RESISTANCE IN OHMS R36 CAPACITANCE 1 MICROFARADS INDUCTANCE IN HENRIES 3 ASTERISK INDICATES FACTORY SELECTED COMPONENT AVERAGE VALUE SHOWN 4 UNLESS OTHERWISE INDICATED ALL GROUNDS ARE DIGITAL GROUNDS GROUND PLANE DIGITAL GND P 0J3 15 16 OUT 5 J2 JUMPERS REMOVED WHEN BATTERY OPTION INSTALLED CR23 AUDIO OUT 18 0 mam NE _ 41 TO A13 RECEIVER ASSY J3 TO A2 SWITCH ASSY BB Vial P OJ V 17 18 CR16 GROUND PLANE ANALOG GND P OJ3 l 39 40 P 0J3 41 15 P OJ3 CHARGE a2 NS CH BOARD INDICATOR P 0J3 R20 P 0J1 10K 14 19 20 J1 TO A13 RECEIVER BOARD 29 P OJ1 J3 TO A2 SWITCH BOARD 47 50 POWER Hi T VOL TAGE AH SE dde 35A14SH5 10 88 Figure 8 40 A4 Transmitter Board Schematic Diagram Sheet 5 of 5 8 91 Service Model 4935A essi alie 1 00 ql e jt 2 5 2 8 8 A Ilda C J 18 000009000 42 e e AIZIR 959 9 91 3
64. U im FROM A2 assy 10 2 RX IMP 12 gt n Co a Gi ae eee i i TO US 13 SHT TO 010 1353 SHT TO 99 7 SHT 10 2 amp 99 2 SHT TO U4A 1 SHT a TO U4B 13 SHT 226 ERR KE RDUM EMEN CM REM M M MEME REDE TO 5 1 SHT O M 11 5 sur St TC ERES ee ee ee UFOs Rr p moi P FO READ BUFF TL uy E TENDRE E U15C 10 SHT anh OPEN 0188 2 SHT 1 CARA c m SS lt lt c3 amp 0158 5 1 yim 10 EUN E E SEET E EEEE E FROM A2 ASSY RX IMP SS n ma rs Se L U T nn_ P t h 4 6 NOT USED dub d 24 19 Y7 X Y 0 12 4 23 1 2 3 4 5 6 7 7 ST Ct 10 2 CE 1 CE 12 CE 13 37 DO 14 15 34 05 22 D4 L CHIP ENABLE 5V 20 20 U13 DUAL 55 ine tae Service MODE CONTROL AO 9 TO A2 DISP STROBE
65. 1382 0757 0442 RESISTOR 10K 1 125W TC 0 100 24546 4 1 8 1002 A13R3 0698 4465 RESISTOR 931 1 125W 0 100 24546 C4 1 8 TO 931R F A13R4 0698 6393 RESISTOR 585 1 125W 0 25 28480 0698 6393 1385 0757 0280 RESISTOR 1K 1 125W F TC 04 100 24546 4 1 8 1001 A13R6 0757 0290 RESISTOR 6 19K 196 125W TC 0 100 19701 4 1 8 6191 1387 0757 0290 RESISTOR 6 19K 1 125W F TC 0 100 19701 MF4C1 8 TO 6191 F A13RB 0757 0290 RESISTOR 6 19K 1 125W 0 100 19701 MF4C1 8 TO 6191 F 1389 0698 0084 RESISTOR 2 15 1 125W TC 0 100 24546 4 1 8 2151 A13R10 0698 0084 RESISTOR 2 15 1 125W 0 100 25456 C4 1 8 TO 2151 F A13R11 0698 0084 RESISTOR 2 15K 1 125W 0 100 24546 4 1 8 2151 At3R12 0757 0453 RESISTOR 30 1K 1 125W TCF 0 100 24546 C4 1 8 TO 3012 F A13R15 1810 0281 NE FWORK RES 1 0 SIP100 OK OHM X 9 01121 210 104 13 16 0757 0442 RESISTOR 10K 1 125W 0 100 24546 C4 1 8 TO 1002 F A13R17 0757 0442 RESISTOR 10K 1 125W TC 0 100 24546 CR 1 8 TO 1002 F A13R18 0757 0442 RESISTOR 10K 1 125W TC 0 100 24546 CR 1 8 TO 1002 F 13819 0698 3457 RESISTOR 316K 1 125W F TC 0 100 28480 0598 3457 A13R20 1810 0281 NETWORK RES 10 SIP100 0K OHM X 9 01121 210 104 13821 1810 0369 NETWORK RES 6 51 100 OHM X 5 11236 750 61 R10UK A13R22 0698 6360 RESISTOR 10K 190 125W 0 25 28480 0698 6360 See introduction to this secti
66. 2 i TPR 4440 bs 14 R AVE 59 2080 10 E Tras TP24 we Og ane en ae PCT ua e 14 28 c2 R46 RJS R38 VIDA 6 1 L Mean 4840 2370 1400 4 2 goo 4 2 R29 2 io 0 look ay he 1 I Pes 14 di ES iE LATCH 2000 E OPTIONS 001 003 ONLY Y YN t FULL WAVE 7 5 SOM 22 Swamy mma Waaa a f RECTIFIER MEMO MD neo Le s ders du DMP PEAK warnsnrY r FF AR 04935 60006 SERIES 2102 a cens BE ADOS M ER M lt e 5 UU maam m anime o tisy KF A2 Al AO ae ae 46 ig 6129 130 2 te o 10 Ape 6008 14 C62 Ue 5008 9 I 4008 a RTs 120 3008 T V 3286 I 2008 1 121 1 4 1008 0 1 uie ge NOTE 5 v 4 ANALOG SWITCHES ARE ORAWN AS THEY WOULD Wit LOGIC ON THE CONTROL OuT Put MONTES t Am
67. 2 I5 2 u 17 OFFSET g dia af ja 5 i 3 i 14 5 I 14 3 14 mor o T aloe Cree isa a 34 fis 4 5 513 3 m ec S os 4 2 5 i2 5 4 e 5 8 7 5 12 5 1259 rey e Ku amp tl 6 m 6 LIU 11 5 hi 6 n el 111 4 4 R E Tu 0 7 io 7j 1 ho T 7 7 C 2 pog BU wo EDD a n 9 9 a Bl fy 8 __ k i H 5 Pa if 9 T ai m 2 R FEM S si A le 4 20 tg di idi We cL be UD ef an EJ imr oto eu A ave 1 HY C MEUM gt m x A um gt 2 3 P 42 UU ped 23 20 2 reas 229 5 pu 2 I N R 21 6151819 9 ML 2 C 552 waq 2 16 6 nlsls uE 5 m 5 5 T i5 2 to TP22 Y Y 4 4 H 4 3 2 u 5 k BABASA 1 Mog i6 41 4 2 2 Bleu det 2 TN ts ib 2 44 5 6 4 j 4 pus 3 3 4 9 sJ 71 N a a ip 5 920 2 e 025 cas TEE 2 lef 2 52529 NO es mo a 4 5 i6 GND 1G a 7 i i IV E 2 n
68. 4 9 9 C5 TP24 U alls Ls 2 2 J pee UM M I PRIME ba ale tee A i I M BIOG 21 f 2 C T ire 15 BLY a PE 4 u f 5 5 61 al 2 Jej i 4 5152 e PANTS m 27 s 2 4 laa 4 dA RE s A CY fu i VINCE 516 MILD 5 ji 3 s 4 5 24 E E t balls a nc T 2 p c isi ioc a ye C T i 2 EE Wes spo y ac d E YR UY al 6 fot D o dom i 6 R65 amp YRYRY a Ta Ede toe ass i s i i e A rx 2 5983 1 i Ps 8 617 2 U z ej gt i me AT 1412 41 E one en J N l fel ece a i 13 fay peat du 4 s e aj 1 a 2 e sta r m H 4 e i 4 i u fie PG 5 TEST US E uos if teli ares X TM 1 5 B PEDE ers nal pa aYaYaYai 4 5 m GAIN t 8 5 T jsi 130 875 RP 41 9 J 2 52 RYR Ar ye 2876 eot
69. 625 26 I 2 3 lt a e 2 7 10 a OG ails Af alavai f s 14 TP 12 wa E T R M CT fRYRIR 5 5 4 H 2 R 9 i 1 2 u 5 s e a eye C t EE UU Bos s emer R 77 4 a 5 4 lt 416 9 0 imam j AIWY i T 34 k 4 4 D A ae x d m T wee see oo 6 6 5 3 d staan oS EET bo eres CI60 GD CAE ix R PME cp 3 530 que RTT GAIN pi 7 LAM D mes Pt me el a a ae C58 XZ Jie 15 6 2 cte 21 19 4 5 4 xi 4 3 fa i AN 5 he 2 4 pee y ane ow 2102 i in 0 Lf 16 2 221 murs L 1 3 EXE 3 O uso a ae Ee o ZEE 5 2 Rize e RNC B MOE u RIRA 195 Go eng i LU 2 m mm bow je R IR R AY dha sou od _ 5 ffias C al 9 1 f 12 2 ub 8 4 SHUNT XL M id at m enn One ing 44 25727 M 5 5 5 a ang 3 C142 C143 4 2 15 N 5 5
70. 8 3 za 0812 22 5 5512 8 3 2 52 2n 4 3 2612 93 9 5 in 150 895 r2 en 9619 292 8 8 sn 552 r a 492 L8 9 7612 920 9 8 en r9 2 592 98 9 2515 5 3 ID 5 8 ir 1612 G 595 8 G 010 9 3 225 9 0 eH 6riD 8 3 192 9 6231 812 9 5 082 42 Zeal 4312 650 8 5 1241 2 9 912 r3 85 4 5 Sldl Grid 2 0 452 5 3 12 9 3 952 trio t2 SSO t g 2512 459 1 3 D 2 0 8 9 0 12 252 66 3 0 152 441 4 6 4 9 955 Sy 5 9 9ELD 9 0 6rD Sdi 5 9 9 0 172 oy SH 5 0 mo gy 8 9 6513 5 3 75 241 8 9 1 2 iL 8 5 8 8 LO i212 r3 zro 8 8 oH 9215 Iro i g 9 5 S212 0 4 5 95 ito 99 212 9 sco 42 5 2210 8 2 55 8 9 r 9 1212 5 reo e B 0210 1 0 655 eB 1 3 65 zo ES r2 491H s a 625 s lt iH 85 4 9112 5 5 szo iv 8 3 GLLO Ly sn bd rely 22 9 9sn 8 5 ssn 2 8 8 3 Fd ate 9 OC LY 93 92 r5 BH 8 3 01 2 82 zzo zen H 8 4 6012 5 5 122 5 is
71. C155 cis 14 AIB RIB3 14 Yr 825 IK FROM A4 XMIT 23 SCR TRANSMITTER MONITOR 24 55 100 T sore tiay r a c56 t 2 iub A35 R50 1 TPIS 750 2 37 a lx Oa elt zl 3 6 8 3 pa 975 For 20 port 3 i re T i ees FROM 2 ue R53 cieo SWITCH BOARD I ox Tene lt 5 lt 2222 2150 2 ALLY C40 14 n 3 SEE ua RTT 5 s 500 a b GAINS 13 5 9 10 AST Unt ee C ese O RCV GAIN ADJUST 0 1 141 11 12 16 DT N 1 3 Q Q 13 14 IN V 14 T NOTE 5 ANALOG SWITCHES ARE DRAWN AS THEY WOULI BE WITH A LOGIC GN THE CONTROL INPUT D OES E 4 TEES IE r 5 C ale 2 rt T TIT 1 TRANSMITTER I 9 P NC 854 R36 i 196K 15 BK 15 1 AA A h NC P 0 R20 _toox EA 19 NC NC NC 01 13 12 10 9 8184 2 s s NC NC NC NC bci 6157 2 21 az F Sade eee r RIIS 1010 i3 3K HZ ob NOTCH 8132 NOTCH 2 RiiT R134 81 td
72. Z m 4 5 8 0 sen 3 09H 5 55 5 ren 9 Orly VQ r3 5 0 SE E Oo 59 a i 1 5 eo SSY M k ozn SH 2 0 an 29 t 3 98145 22 9 sin 9 rin O 9 5 zin 9 0 Ores 9 2 5 9 iy 2 en gt Es in rd Sr 2 3 Pv ee sn c0 ziy 8 0 98 en 8 5 9 8 5 8 in 7 12 Sedi t J ity i 90 Shiv 2 E see 8 26 3 3 Stu 42 8 3 92 f 1 1241 d Sidi ee __218 1 fidi IEY esla d Is idl id i v Zidi 59 e 628 re CJ 5 0 12 rd JJ o 2 8 631 801H 0 1 3 50 9 0 9 3 seta 8 oY Sal 2 T Sela
73. aaan a j _ a 7 20 R33 I GROUND PLANE 50 E E 1000P 7 ji 511 GROUND PLANE C2 3835 tOK P O REAR PANEL ASSY L 4 uc DEAL J m M4 CRIO X 7 ar T p v d _ RIS cii 100K 2200 CI2 16 R28 CRIS 100 0 1 100 EORR eR NE ll o GROUND PLANE GROUND PLANE RI4 14 RI c5 100K 7 2200 PART OF J2 OPE M el L 2 P O REAR PANEL ASSY 1 ie ee i _ uU Cit SARs ey gt wa NA A2 R35 77 OUTPUT LEVEL go OOP SELECT MUX i C qe RENE JO 5V P O GROUND PLANE DIGITAL GND J3 gt 15 16 11 AUDIO GNO 31 34 t j 1 TO A2 SWITCH BOARD Manual Changes CIRCUIT APPLIES TO P AR UNITS ONLY 41 TO A3 RECEIVER J3 TO A2 SWITCH BOARD NOTES 1 REFERENCE DESIGNATIONS WITHIN THIS ASSEMBLY ARE ABBREVIATED ADD ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTION 14 2 UNLESS OTHERWISE E EP 17 18 RESISTANCE IN OHMS P O CAPACITAN
74. i c E 1 2m 1 vs 52 1j 4 MR 1 m hs t y eS SC AN ape 3 i Come R j iud 6 6 2 u 6 7 6 3 PEL AE 2 iy ks a 1 ds rog LX Rt i m es SO 14 Ren pos e QM 8 m 76 ox gt i 3 sa RYRYRA 9 n E ojoo up s R 2 i s i C94 fe al 9 4 6 S a fue XS Val ORNA T SH Se 3 SNC T MADRE 4 Lu 1 a Py 2 4 aye N E A 4 e Gua t lal a a dajal ni i rice pel 3 2 5 3 EM it et 4 glass 4 i 11 i D alee 5 ra D gt es 1 5 n 4 1 4 6 3 i wa Se uo 209 D 24 eee Nai 2402 Yi 7 P uo 1 ou C ma a dE ay tags spo 4 D EE R c Wee 2 a2 e 2 Pre C128 a t s han S 777 S d 1 4 NN vod T 14 4l 44 G lis i 2 ne 2 ii 2 M 9 2 3 ars 1840805 EES 54 5 6 ig EN Tg 54 BR 2 oa BAR a j MT 2 ima
75. im i 1 49 50 253 4 20 3 i 16 3 18 3 18 7 8 3 94 4 Jt 15 4 ri ig 3 6 3 14 5 16 5 16 i jal i 176 I5 4 13 14 15 BP oa firs 6 16 7 14 5 12 14 1 14 5 3 4 2 5 112 5 is 3 5 1 a 13 13 s a fi 5 14 9 iz 7 10 9 12 i2 2 3 5 6 5 10 O 1410 9 10 tt 10 1 e amp 2 6 T REST c5 o _ R i z 7 4 our PUT c59 04935 60207 inj REV 22074 387 REVISED 10 82 Figure 7 17 14 Transmitter Board Component Locator 7 28 Model 4935 2 2 P O A4 TRANSMITTER BOARD 04935 50205 A 4 TRANSMITTER ASSY WITH 04935 60207 REVC 2208A WAVEFORM 5 sem pc m enr LT DIGITAL TO ANALOG CONVERTER 5V U49D J EN a i Tools NC fe x NC rM NC NC 3 7 7 co N x N 7 2110 0065 2110 0295 AC LINE VOLT 220 740 NOTE FUSES ARE NON TIME DELAY TYPES U49E U49F U498 U49C oda w i 5K sasa e J mA CROWBAR PROTECT I 1 t i T2 R 07 Se I et
76. l oo fus i e 1 EE 13 12h ue x assy UL lt I wr nous 41 TEL TOEONT 351530 SSPIN 7807141 25 2157003 403 NOL YIAGMEGT 2 787555 243 Iy la 34V 84353 SIH NTML Ia 30 12834331 2942 SNAGS 1 i TENDIS S Cb z 5 EE p 4557 Tiia TASNYY V s l f bs n Dd i 32 03 iN3NOGNO 03123735 m 2 SHLVIIOMT a WSIM3iSY f is 531 4N 3HONDIN SINY GNT 129251 Sdvuv4ONO A 32NYiI2TdY2 Y l XA 3 lt 5554 ZY 1 Ba 559 _f 54100515 334338 JAY 801lN0W _ _ r 1 1 se 2 T3 i as 1 PITE J31SIML1 1 EL eat cm aSs E INOW PNE 294 2704 LNX 2 1 iN 38802 NC e wv n 5 1912 M 5112 2 H iN3HHh2 i Iq30H 01415
77. teda egens 6 5 PRO j 7 R28 lota k BRG 5 xm 27 Y Cr 1 i 1 RZE 8 A s LRH sie Soa i 3 2 3 5 J ia d i 25 Figure 7 1 A2 Switch Board Component Locator 7 10 Model 4935A Manual Changes Page 8 68 Figure 8 28 Al 3 Receiver Board Component Locator Change the Component Locator as shown below 124 TPA awi HI MID ar e qe 880 rw E i 49 LI 4 i 2 E 987 r d NA E M 2 2 gt 5 d 200 eee me o b ge 33 4 v fei 5 u 14 gt 6 ur gu 5 3 6 2 J 4 le s 5 B cop tel 4 UA Cebu E cul 404 i R el a QR C Riel ME OU _ YT MEE ae Po 16 Lise No Cs 42 s 5 2j 15 Ss 5 ze as 2 28 az pote u ER a bi Wi E x 7 a Y a Y 14 R EN 4 4 E pon I f ADS 2 8 41 dos 2 ua 4 4 2 13 a 5 22 75 d TEE ug o s 12 12 5 E i 6
78. 0 100 24546 C4 1 8 T0 1002 F 14897 0598 3150 RESISTOR 2 37 1 125W 02995 1 14 898 0757 0280 RESISTOR 1K 1 125W 0 100 24546 4 1 8 70 1001 A14R99 0698 3157 RESISTOR 19 6K 1 125W 02273 CEA 993 41 100 0757 0428 RESISTOR 1 62K 196 125W 02995 4 1 A14T1 9100 2647 TRANSFORMER AUDIO 28480 9100 2647 14 1 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 28480 1251 6947 ATATP2 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 28480 1251 6947 A14TP3 1251 6847 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 28480 1251 6947 14 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 28480 1251 6947 14 5 1251 6847 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 28480 1251 6947 A14TP6 1251 8847 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 28480 1251 6947 14 7 1954 6947 CONNECTOR SGL CONT PIN 025IN BSC 325Q 28480 1251 6947 TA 14 9 1251 0947 CONNECTOR SGL CONT PIN 025IN BSC SZ SQ 28480 1251 6947 A1ATP10 1254 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 28480 1251 6947 A14TP11 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 28480 1251 6947 ATATPS S 1264 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 28480 1251 6947 A14U1 1826 0679 IC OP AMP LOW BIAS H IMPD 99 0192B CA3140AT A14U2 1820 1932 IC MV CMOS MONOSTBL DUAL 04713 MC14538BCP A14U3 1820 1932 iC MV CMOS MONOSTBL DUAL 04713 MC 14538BCP 1404 1820 0939 IC FF CMOS D TYPE DUAL 01928 CD4013AF A14U5 1820 0939 IC FF CMOS D TYPE DUAL 0192B CD4013AF A14U6 1820 2
79. 1 OND Gi 3570 238 o 771 1 war 4 301 xw pE 1 s 1 ay cc ae ri 174 H Dh Dae L H ea td F LL HOLON e _ a M U U U 1 i w 531113 _ 1 Noll2iT s V 4 3owYO3sA 0n E caine j 3314495 i 8 77777 06 3SIn mui 7 7 z a i Ol 359 E 19338 Qasni sii bape j f FP 381 CES i i H31Y INOS DSIN MOBI 35 waaire 9999 P i RENE 1 82 5 35 BSLLINWNSNVH I pietas AE FYS9710 O15 5 VSE 6F 69 8 jeugd 11014 V 2 8 aunBiy pt Si 91 I Bl 6 12 Z 12 22 Z be 292 WO3 3 Id IV 0 4 SHOLVIINONNY MNV8 13431 NIW MV34 HS3HHI 117130 Nid 1917 NM3ii1vd 1113 LNOM4 9 9 32981 3313WiH3d SYOLY
80. 10 Vrms at 60 Hz to these jacks NOR REV l Press in the NOR button to connect the left 310 jack to the transmitter and theright 310 jack to the recelver 2 To reverse the direction of the test press the REV button IN Impedance Press the TRMT impedance button 42 that matches impedance of circuit on side 2 Press the RCV impedance button that matches the impedance of the circuit on the RCV side If the test set is to be used in the bridged mode press the BRG button also This means that in the bridged mode two RCV Setup buttons will be pressed in the correct circuit impedance and BRG button Note Do not leave the BRG button IN while the instrument is actually terminating the circuit as it will cause a 6 dB error Figure 3 2 Measurements Model 4935A Operation 3 9 MEASUREMENTS UJ 4935A TRANSMISSION TEST SET OUTPUT PB HEWLETT PACKARD J THRESH CNTS LEVEL ON i O dBm kHz STRY ae POWER pu RCV TRMT C MESSAGE C tOW SET Cue ome C C with TONE 15 KHz FLAT 60 MIN HIGH GENRES 5222 5 222 SIGNAL NOISE PROGRAM STOP TIMER s IMPULSE MONITOR DIAL OO LEVEL AND 1 NOISE TO A GROUND 50 PERIOD M DISPLAY F2 VOLUME 404 1004 FILTER Med F3 stop F4 STORE 2804 2713 B
81. 11 nn T een 36001 1 4004 1 PO 1004 297 S RE QT rien gt i 7 i n PF r _ gt gt i j 25 tae FT IIT a 2 39v tee fe 4 E i s s T L seit 3 lt www era wa 4 awa Y s ss WE T30099 9t8vO awed 222 3 92 28 43223230 SY sadunu ununnr L ru P O FROM 4 XMIT 23 TRANSMITTER 3 MONITOR 24 gt P O s e Port FROM Af i I lt 1 SWITCH BOARD lt S Us E i i 6 ae i t I 4 FROM 4 x TRANSMITTER re 5 6 T t I t E 27 2 30 gt FROM 44 TRANSMITTER id ANALOG 40 GROUND 4 SHIELO C38 ABS C40 14 UF C34 A Oegur RS 1900 l 13 14 g Res 186 30K c92 01 R97 240 738K 14 55 ag RTS 2150 T 3 12 RTT eR13 EE n3 d RCV 500 v 0 1 GAIN 13 5 9 10 T N 14 5714 17 L RCV GAIN ADJUST AMP 0 1 Pu ee OMNE 7
82. 1251 8947 1258 0141 12516947 1258 0141 1251 6947 1258 0141 1251 6947 1258 0141 1251 6947 12560141 104 104 104 1851 6847 1853 0512 MPS A42 1853 0512 1853 0512 2N2904A 2N2218 1853 0036 6 19 Replaceable Parts Model 4935A eference P Part esignator umber Qty Description 0757 0465 RESISTOR 100K 1 125W TC 0 100 C4 1 8 TO 1003 F 0698 6360 0757 0819 0757 0442 0698 8827 0698 8826 0698 8826 0698 8827 0698 8827 0698 8826 0698 8824 0757 0442 0757 0465 0698 6360 0698 3440 0698 3440 0757 0465 0757 0442 0757 0442 0757 0288 0757 0420 0757 0420 0698 0083 0757 0465 1810 0207 0757 0465 2100 3882 0757 0416 0698 0083 gt NO RESISTOR 10K 1 1259 F 0 25 RESISTOR 909 196 5W 0 100 RESISTOR 10 1 125W F TC 0 100 RESISTOR 1M 1 125W TC 0 100 RESI TOR 825K 196 125W F TC 0 100 ISTOR 825K 1 125W F TC 0 100 RESISTOR 1M 1 125W 0 100 RESISTOR 1M1 125W TC 0 100 RESISTOR 825K 1 125W FTC Ot 100 RESISTOR 562K 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 ESISTOR 100K 1 125W TC 0 100 RESISTOR 10K 1 125W F TC 0 25 RESISTOR 196 1 425W F TC 0 100 RESISTOR 196 1 125W TC 0 100 RESISTOR 100K 1 125W TC O t 100 PESISTOR 125W F TC 0 100 RESISTOR 10K 1 1 TC 04 100 RESISTOR 10K 196 125W TC 0 100 RESISTOR 10K 196
83. 28480 28480 Mfr Part Number 04935 60307 0160 3963 0160 3963 0160 3963 0160 0576 0180 3045 0180 2945 0160 0576 0160 0576 0160 0576 0160 0576 0180 3045 0180 2945 0160 3456 0160 0576 0180 3044 0160 0576 0160 0576 0180 3456 0160 0576 0160 0576 0160 0576 0160 0578 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0180 3050 0160 0576 0160 0576 0160 0576 0160 0576 30D506G025CC2 0160 0576 0160 0576 0160 0576 0160 0576 Ret et ae 60 0576 0160 3291 0160 3291 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0127 0180 T02710 0160 4135 0160 4135 0160 4135 0160 0576 0160 0576 150D225X9020A2 150D225X9020A2 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0127 150D106X9020B2 0180 1746 0160 4833 Manual Changes 7 67 Manual Changes Model 4935 Table 6 3 Replaceable Parts Continued Reference HP Part Designator Number D Description Mfr Part Number 14 74 0100 4835 7 CAPACITOR FXD 10 10 50VDC CER 0160 4835 14 75 0180 0291 3 CAPACITOR FXD 1UF 10 35VDC CER 0180 0291 A14CR 1902 004 4 DIODE ZNR 5 11V 5 00 35 PD 4W 1902 0041 A14CRA 1901 0033 2 DIODE GEN PRP 180V 200MA 00 7 1901 0033 A14CR6 1901 0731 7 DIODE PWR 400V 1A 1901 0731
84. 3407 NOTLdIHIS3G 31371402 H04 Oi W3BWDN ATEW3SSY AlddM S SNI 1 2 QOY QO31vIA3HBEY 3HY A18NGSSY AlddhS ININ OYAv 1 1 NTHLIM 5 011 897520 32N38343M Aldd iS INIT 3 eee vOZ2 8 AJH 50009 35650 do i 2 4 f 39HV 42 2821 98 GV Model 4935A A5 BATTERY CHARGE BOARD 04935 60005 REV B 2204 38 J2 14V BATT 2 515 5 REGULATOR 14 B 2 Sate CIRCUI TRY HEAT R32 R34 4 SINKED 519 3 9 415 CR29 P O CR28 JI R22 Educa 55 AC LINE SUPPLY TRANS EER EINE SUPPLY 5 I 14 AC LINE SUPPLY R37 1000 R33 10 CR24 CR23 R35 2370 140 158K t I R36 383 CR22 1 I RIT 140 158K R14 121 78K RII R20 10 QI s R23 2370 LOW BATTER AC INHIBIT i Manual Changes s NOTES FROM BATTERIES OR 45VAC LINE SUPPLY 5V UNREG UNREG VOLTAGES TO REFERENCE DESIGNATIONS WITHIN THIS 14VAC LINE SUPPLY 14 UNREG gt SMIT BOARD l ASSEMBLY ARE ABBREVIATED ADD 4VAC LINE SUPPLY 14V UNREG REGULATORS ASSEMBLY NUMBER TO ABBREVI
85. 6 Model 4935A a U2 pin 3 should bc 7 0V 40 1 V If not check R38 R39 and the 14V regulated AC supply on the 4935A transmitter board The unit should be ON U2 pins amp 2 should be 7 0 20 If not replace 02 01 U2 pin 7 should be 7 0V equal to U2 pin 1 100mV If not replace U2 UL R14 or R28 as necessary Cheek the inputs to the comparators d References Ul pin 4 47V Ul pin 7 7 Ul pin 8 GND b Scaled Supply Voltages Ul pin 5 gt 7V more positive Ul pin 6 7V morc negalive Ul pin 9 gt OV any positive voltagc If not check the AC supplices and the voltage dividers R9 amp 814 RIG amp R17 Replace Ut if necessary Check Ul With the inputs at levels given in Step 5 the voltage at pins 1 2 and 14 should be OV open collector outputs If not replace Ut and or CRS Model 4935A 8 267 8 268 8 269 Service Check the acinhibit sense The voltage at the junction of CR3 CR5 and R10 should be more negative than 17 v 16 v at the low line voltage limit 21 v at high limit If not check the 17 vac supply and CR3 Check the inhibit circuitry common to both ac and low voltage inhibit functions a Measure each side of C3 then subtract to get the voltage across C3 CAUTION Do not ground either side of C3 b Under ac opertion it should be about 7 volts Remove power Turn cycle power switch from ON to STBY to ON and wait
86. D 919 9 5 5 5 539 i 5 5 8 6 i 5 9 0 cid aS zd 42 15 5 3 1u2 58 0 2 2 L8 82 B 5 0 95 9 2 8v 22 3 ien 9 9 3 c aD iv 92 Q en 9B 5 ein 8 9 BHO Ly ro eg an Uy v3 9 1 IBO e sin 6012 io 321613 9214225 T SEDOS SEE PO UB Se 2e 2 j e m e 4 2977 y ms e ii ree 0 H 1018207 yUsUOdWOD peog 5 py Se 8 eJnDiJ 96 56 v6 ce 06 99 99 8 ve 8 64 44 84 e 04 48 55 ec ss lt tt 29 r er zt ot 5 st et gt Oe Bt eee ae gt a n lt 2282 5 AJJ DIE 5 5 88 81 15089 4018907 pjeog Jaywsuel py 52 8 oJnDiJ 5 8 0 90 0 E wou 2 29 CEDERE t2 en 5 9 101 8 5 an ttu 5 2 00 2
87. GROUND PLANE DIGITAL GND J3 15 16 f s AUDIO GND aaa a 31 34 NOTES REFERENCE DESIGNATIONS WITHIN THIS ASSEMBLY ARE ABBREVIATED 00 ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTION 14 2 UNLESS OTHERWISE INOICATED 1 14 RESISTANCE IN OHMS 17 18 CAPACITANCE IN MICROFARADS Ji INDUCTANCE IN HENRIES 27 30 3 ASTERISK INDICATES FaCTORY SELECTED COMPONENT AVERAGE VALUE SHOWN 4 UNLESS OTHERWISE INDICATED ALL GROUNDS ARE DIGITAL GROUNDS GROUND PLANE ANALOG GND 39 40 A2 37 44 SWITCH BOARD pe J3 35 M Bo POWER 14 19 20 SWITCH P O JI RECEIVER 1 1 i4V Ji J3 TO A2 SWITCH BOARD ON 47 50 0 ON OFF o A ar nsnm ame em P O 32 noI T o N s gt 36 5787 ss sh 5 33 y E c A4 Transmitter Board Schematic Diagram NC mn 2 BO gt pv S EE f w Figure 7 18 _ _ CUM REVISED 107 82 SHEET 2 OF 2 7 29 mes Manual Changes Model 4935A P Q REAR PANEL ASSY Ec M 2 SUPPLY SECTION MERE m LiHEAT SINKED J u kas EE M CROWBAR OVE RVOLTAGE PROTECT CIRCUIT 2 TT Qus
88. I 7 E C i a d 8 B RIIRIIR RIE R R TURER 2 C3 2 2 2 22 21131 4 6 U2 TER 5 7 9 7 _ _ R 2 2 vm CPI smo m oo Caa C 415 5 L _ _ EN CYC R R CF3 e 2 HEATSINK ale E SUD eee Y 22 x Figure 7 2 A5 Charger Board Component Locator 5 AC LINE SUPPLY R24 R2 2370 2 2370 25 CRI5 2370 CHARGE INHIBIT o 7 VOLT REFERENCES Figure 7 3 Partial AS Charger Board Schematic Model 4935A m H i 2 3 4 i d n r Sp pS A 1 e 15 6117 Jei Whe 15 2 152 14 3 i 3 jy i U pa aj u ja 4 2 2 5 3 2 5 6 I 6 7 107 N a j R2 6 1 15 2 15 2 i 14 5 fa 4 u 3 4 j 3 12 5 12 5 b 6 5 IG 7 T 9 B a 14 12 11 10 77 2 13 3 12 4 tl 5 10 al 7 __ 2 u 3 2 4 4 5 0 Manual Changes 14 c5 4 __ ZI 3 04935 60107 REY A 2204 38 LN
89. SU 8 9 LEN 8918 9 4 8H 9 8 ty 912 252 s 19 od een zr 914 9 3 98H 69 52 550 1 n td stn er 9814 94 588 98 620 E nj 9 ad 2 4 or Solu 9 3 vou 5 6 lB r9 culo sa 925 i a s 15 i 3018 31150e 0 83 n UR 59 60 29 2 qeu 9399071 Ud een gar 2 Re eg tee age tl ade 2 94 iEn rH 2914 54 sar 90 520 i I r sj T 2 2 8 4 mri 99 50 2 uda aioi 6 3 LH rd Sa enr 9012 aa Ezo an v2 i 8 3 920 20171 zzo Apu SIN si S a 6 3 LH 89 99 so IZo P diis 2 sen 9H 1519 5 4 923 ca so SOLD id oy i 01 4 al it 6512 ula DEM 3 vcn 97H 9418 5 4 2 23 812 moa 1 3 imus E ic 5 3 ezn 63 rit 68 2012 r is j CDi s ezn 9H 63 68 2012 9 0 pee ale ME GH Sta 83 6 amp 8 6
90. Service Model 4935A 8 272 SERVICE SELECTION OF NOISE FILTERS BY HAND 8 273 noise filter select MUX can be hand programmed to desired filter with a DIP switch inserted in JU1 in place of the shorting bar 8 274 Procedure 8 275 1 Remove shorting bar from JU1 2 Insert DIP switch with all switches open 3 Close the switch between pins 8 and 9 This is the strobe for latch U11 with switch closed latch outputs follow latch inputs 4 Use switches between pins 5 12 6 11 and 7 10 to select filter according to Table 8 10 Table 8 10 Hand Selection of Noise Filters SWITCH SETTINGS S6 PINS 6 amp 11 ADDRESS FILTER D2 S7 PINS 7810 C Message 3 kHz Flat 15 kHz Flat Program 50 kBit P AR Filter Flat No Filter Ground CO O Closed Closed Closed Closed Open Open Open Open Closed Closed Open Open Closed Closed Open Open Closed Open Closed Open Closed Open Closed Open 5 When you are finished replace the shorting bar in JU1 pins 1 16 2 15 3 14 4 13 8 276 SERVICE SELECTION OF AUTORANGE GAIN FOR SERVICE 8 277 The autorange circuit can be forced to a desired gain manually for servicing CAUTION U17 is static sensitive 8 278 Procedure Remove U17 from its socket and insert into protective foam ee Place a DIP switch in JU4 2 Select the desired autorange state according to Table 8 11 Model 4935A
91. TC4 2 098 6423 138127 0698 6754 2 RESISTOR 44 2K 590 125W TC 0 50 NC4 1 8 T2 4422 D A13R128 0698 4537 5 RESISTOR 357K 1 125W F TC 0 100 0698 4537 13 129 0698 7585 9 RESISTOR 316 2 1 125W F 0 25 0698 7585 1 1 2 2100 3883 9 RESISTOR TRMR 5K 10 TOP ADJ 17 TRN 2100 3883 3 1 34 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 13 135 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 136 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A13R137 0699 0590 4 RESISTOR 15 758K 1 125W 0 25 0699 0590 138138 0698 3456 5 RESISTOR 287K 1 125W 0 100 4 1 0 2873 A13R139 0699 0596 0 RESISTOR 4 12K 1 125W 0 25 0699 0596 A13R140 0699 0596 0 RESISTOR 4 12K 1 125W 0 25 0699 0596 138141 0699 0594 8 RESISTOR 2 21K 1 125W F 0 25 0699 0596 A13R142 0699 0594 B RESISTOR 2 21K 150 125W 0 25 0699 0594 A13H143 0698 8337 1 RESISTOR 10 7K 1 125W 0 50 MF4C1 8 T2 1072 B A13R144 0698 8068 5 RESISTOR 4 99K 25 125W 0 25 4 1 8 19 4991 A13R145 0699 0597 1 RESISTOR 2 26K 1 125W 0 25 0699 0597 A13R146 0698 6447 0 RESISTOR 683 8 1 125W 0 25 0698 6447 A13R147 0698 6446 9 RESISTOR 2 162K 1 125M 0 25 0698 6446 1 38148 0699 0592 6 RESISTOR 7 741K 1 125W 0 25 0699 0592 1 3149 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A13H150 0698 6360 6 RESISTOR
92. When the C message filter is selected readings are displaved in units of dBrn C and thenoise level with a C message weighted measuring device is displayed in dBm 3 42 NOISE WITH TONE Notched Noise 3 43 The noise with tone measurement technique is used to condition compandors and or quantizers in the transmission system to their normal operating levels for continuous data signals Therefore noise levels are received which duplicate levels present under operating conditions 3 44 lo make this measurement a 1004 Hz test frequency holding tone is transmitted at a data level At the receiving 4935A the 1004 Hz holding tone is selectively attenuated by 50 dB using a notch filter all frequencies between 995 Hz and 1025 Hz are attenuated by 50 dB The remaining received signal noise is passed through a filter for measurement The received noise level is displayed in units of dBrn Figure 3 1 1 illustrates the combination of the C message weighting and notch filter characteristics The 4935A combines notch with any of the five filters 3 45 SIGNAL TO NOISE MEASUREMENT 3 46 The signal to noise mode allows measurement of the ratio of received signal plus noise power to noise power 5 t N N 3 47 make this measurement a 1004 Hz test frequency is transmitted over the line At the receiving 4935A the 1004 Hz signal is selectively attenuated by 50 dB in the notch filter usually C message weighted The remaining received sig
93. ZERO UP DOWN TRMT MEASUREMENT FILTER IMPULSE NOISE ms R TRMT LJ FREQUENCY 1 C MESSAGE 5 MIN CL LOW SET Re NOISE 1 3 KHz FLAT 15 MIN C MID HERD 115 umm C WITH TONE 15 KHz FLAT 760 MIN C HIGH SIGNAL Sanne C PROGRAM STOP NOISE TO GROUND MEAS IMPULSE NOISE TRANSMITTER C 50 KBIT MONITOR PERIOD F DISPLAv F2 VOLUME 404 1004 mu m ao gt o 79 h Press MEAS key to select IMPULSE NOISE b Press DISPLAY TRMT RCV key to display the transmitted signal TRMT light will be Press FILTER key to select same filter as the receiver will use Although the transmitted signal is not affected by the filter selecting either the 15 kHz FLAT PROGRAM 50 kBit filter will quiet terminate the transmitter instead of sending a hold tone 4 lum OUTPUT LEVEL knob to adjust level to data level usually 13 below transmission level point Figure 3 2 Measurements Continued Mode 4 CA 49354 TRANSMISSION TEST SET OUTPUT HEWLETT PACKARO THRESH 5 LEVEL 2 kHz ON TRMT DISPLAY EE i Hz STBY MIN A A A A A A i SF LEVEL JES s TRMT RCV RCV TRMT
94. dBm 1 3948 Vdc VFC FREQUENCY COUNTS Figure 8 3 Voltage to Frequency Conversion Output 8 37 These dc signals are selected and routed to the voltage to frequency converter The voltage to frequency converter is linear and the 10 volt reference signal is very accurate The 10 volt signal is used to recalibrate the V To F converter whenever a new measurement is selected The 10 volt frequency is approximately equal to 60 kHz Assume that the 10 volt frequency is exactly 60 kHz Then if detector output is 3 volts the V To F frequency will be exactly 3 10 X 60 kHz 18000 Hz The number of 3 volt counts in 70 milliseconds will be 1 8000 x 070 1260 counts 8 38 HOW TO COMPUTE FREQUENCY AND LEVEL MEASUREMENT 8 39 Level Calculation Example 8 40 The 10 volt reference level in dBm is 10 volts 20 log 13948 volts 17 1 dBm Also LOvolts flOvolts _ 10voltcounts Vx vx counts The level in dBm is calculated by the microprocessor as follows 10 volt counts v idBm 17 201060 v counts For a detector voltage of 3 volts the counts in a 070 sec interval would 1260 counts Similarly the 10 volt signal would result in a count of 60 000 x 070 sec or 4200 counts 4200 _ 17 1 20108 1980 6 65 dBm If the microprocessor has added twenty dB of gain to get the signal within the 1 volt to 5 volt level window the microprocessor will subtract 20 dB from the 6 65 dBm signal and display 6 65 20 13 3
95. eH 66 2 8 0 250 42 teat 8 3 5 5 2 9 612 189 5 5 3 Bo 052 8 5 ep ttu 5 etin 8 0 692 iH 514 8 3 eg eeu 8 5 42 5 3 45 22 5 9c 9t2 t3 Elai id L8 95 S212 3 52 e q Zidi 5 9 42 9 5 v3 5 9 12 5 5 2 Olds t J 409 5 9 2212 zro 2 9 691 r3 901H 1 0 9 219 t g iD 1 3 di 5084 9 0 c o 0219 rg ora 9v 9 0 6115 555 oY Sdl 9 12d 29 8112 2 0 922 oy S2 2 9 4112 BD 425 oY 2 3 5 2 8 4 9112 8 9 9 66H gt Bi 8 4 5112 2 Sco 2 1 964 5 8 T3 18H 5 8 93 eg 96H o Gig 9 3 21153 9 9 L8 565 9 6 9 3 iiio LEO 19 8 3 5 8 5 4 620 268 ca Dig 9 3 6012 5 0 829 eeu 5 8 6g 9 3 BOLD 22 8 8 16H 5 5 5 3 019 25 922 9 8 5 8 3 9012 0 Seo 2 81 8 3 68H 5 8 rd S012 22 22 iv S8i5 5 3 895 5 9 Su td rola 2 ezo gsn ied rely 5 3 188 5 8 Td 012 2 0 550 8iH re ty 2 2 122 28 Zee 588 2 3 10
96. gt i a C SY R 3 9 c 25 no die jo je een T 196 nn e 4271204 ae i 253 yey WO la 54 7 gt eee sy 52 CIA i zl 2 SE LJ RTH 5 m 1 3 F 1 4 5 a LOCATOR GRID KEY LOCATOR GRID KEY Jacks Plugs Non Sequenced Components Jacks Plugs Non Sequenced Components TP14 E2 TP15 NONE TP16 NONE J1 TP17 NONE J2 TP18 NONE J3 TP19 NONE 4 TP20 NONE TPIS TP21 C6 7 P1 22 6 TP23 24 6 TP25 C7 Figure 7 14 A3 Receiver Board Component Locator 7 26 FROM 4 TRANSMITTER FROM SWITCH BOARD XMIT 23 ass MONITOR 24 RECEIVER BD 04935 60004 AND A 3_RECEIVER WITH P AR 04935 60006 SERIES 22084 C158 182 R183 14 P O 825 IK 6 CRI2 2 R75 1 l RCV GAIN ADJUST AMP lt lt eee Figure 7 15 13 Receiver Board Schematic Diagram Partial 20 C57 4 2 4 z 1500PF 160 14 C55 R76 0 1 i 2150 ALLY LOADED C40 14 3 Manual Changes EE NOTE 5 ANALOG SWITCHES ARE DRAWN AS THEY WOULD BE WITH A
97. i 562 BO E S 2 2 Sn 9 3 469 1 2 Seu 8 3 962 d zi 5 3 R 2 4 9 8 in 3 555 20 162 813 193 4 Fx E 18 LH 2 3 08D eH 23 LH 1 3 282 SH 991 3 1 9 o 7 3 85 ra 5 2 ia o idi I H r8 18D 5 5 08D il rS 6 2 9 ug 855 1028 1 8 42 6 3 942 6 tQ 2 22 3n 42 12 42 66H 92 045 ceo 29 wey 2 9 482 g es 168 x 5 783 i 90 eso 3 v6 42 292 3 952 UH 268 552 g B 0t 52 818 e zey eso 4 g rH UT cs 5 B O ORY 3 fe fe 5 0 ZA 82H Sro 5 LA 928 r3 5 2 3 esn LH 3 tro 2 5 esn rH 292 P m 8 0 osn 3 iro Ei 45 ern 9 4 8 3 le LD e n d 53 9co 9 Lon 2 3 sco R _ 9 5 Sen d 2 3 co son 5 9 sn d 1 3 EIL 522 5 rd 1 3 eco 5 9 4 o Mr i ro zrn ry eg T ien 2 3 9 0 622 gen 5 3 orn 2 3 0 sco 193 een r3
98. if only a single pin of U6 3 4 5 6 is low then replace U20 2 Check U20 pin 1 with a logic probe It should be low if no membrane switch is pressed It should go high and stay high when any membrane switch is pressed If not check the inputs At least one input U20 pin 2 3 4 or 5 should go low when any membrane switch is pressed If not replace U20 If none of the inputs go low then the front panel key matrix and or wiring 18 suspect 2 Check U3 pin 9 with a logic probe It should pulse low but not stay low when any membrane switch is pressed Replace U3 if not 4 Check U5 pin 12 with a logic probe It should pulse low but not stay low when any membrane switch is pressed 5 Check U5 pin 10 with a logic probe When any membrane switch is pressed it should be normally low and pulse high but not stay high If not then the microprocessor U6 is suspect 6 The line monitor circuit should beep whenever U5 pin 12 pulses low which should happen when any membrane switch is pressed 8 192 CONTROL AND COUNTING SECTION TROUBLESHOOTING 8 193 Use the Diagnostic Service Kit signature analysis procedure to troubleshoot the control and counting section Most of the microprocessor and counting section is located on the transmitter board NOTE This procedure requires the 4935A Diagnostic Service Kit HP 04935 60014 Model 4935A Service 8 194 TRANSMITTER TROUBLESHOOTING 8 195 To troubleshoot the transmitter section
99. relative line balance of an end loop can be calculated by subtracting the measured noise to ground N value from the measured message circuit noise value This calculation is only valid if the measurements are made on a twisted pair and it is assumed that the message circuit noise is caused by longitudinal noise converted to message circuit noise by line imbalance It is recommended that both message circuit noise and noise to ground be measured with the 3 kHz flat weighted filter to include the effects of power line related noise 3 59 PEAK TO AVERAGE RATIO MEASUREMENT 3 60 The 4935A uses the peak to average ratio P AR to measure the channel dispersion spreading in time of signal amplitude due to transmission imperfections As the P AR signal traverses a dispersive medium the peak to average ratio will deteriorate Then by measuring the peak to average ratio at the receiving end a simple measure of dispersion is obtained P AR is measured as the ratio of the peak to full waverectified average values of a specially processed test signal transmitted over a line The test signal has a peak to average ratio and a spectral content that approximates a data signal Figure 3 15 illustrates the frequency spectrum of the transmitted P AR test signal and Figure 3 16 illustrates the signal envelope 3 25 Operation 3 26 Amt ule d B 10 20 40 50 300 Amplitude 2000 3000 Frequency Hz Figure 3 5 P AR Tra
100. 2 3 veo 23 ody riyo 2 3 0 6 3 595 63 erik 13 998 L S30 O36 20 5 338 338 201 530 201 2207 9 13413934 ELY 82 8 aunbiy m 5612 2213 82 8 3815 LINDNID sen 8 92126 3115 J E25 F 7 HOARE 2241 Cae 857 8 w es r 6 113 13 485 Suo Eyo 0 120 voco 103 09 5 6519 8512 15 9 9515 ssi rSid 515 259 1512 0512 6512 85719 715 9215 613 2458 tri2 27 3 4610 185 5 182 6 2 825 9 2 549 27 22 49 2 072 ro 75 575 72 2221 r3 APPLIES TO STANDARD UNITS ONLY APPLIES TO P AR UNITS ONLY P O A13 RECEIVER BOARD ASSY 04935 60035 FROM A4 A14 XMIT 23 TRANSMITTER MONITOR 24 ASSY FROM A2 SWITCH BOARD v2 6 DOUBLE P O J4 A SHIELD 27 28 29 30 47 48 49 50 P O 10 7 o CA FROM 4 A14 __ 7 TRANSMITTER ASSY 9 5V 15 ANALOG GROUND 41 42 C210 43 TP2 01 5 Br Pe id NZ unc RCV GAIN ADJUST AMP
101. 20 50VDC CER CAPACITOR FXD 2 2UF 10 20VDC TA CAPACITOR FXD 2 2UF 10 20VDC CAPACITOR FXD 1700PF 190 100VDC MICA CAPACITOR FXD 1700PF 1 100VDC MICA CAPACITOR FXD 1700 1 100VDC MICA CAPACITOR FXD 1000PF 1 500VDC MICA CAPACITOR FXD 4751 1 300VDC MICA CAPACITOR FXD 1000PF 1 500VDC MICA CAPACITOR FXD 1UF 20 SOVDC CER CAPACITOR FXD 1UF 20 50VDC CER Indicates factory selected valuc Manual Changes Mfr Part Number 04935 60004 0180 3124 150D156X9020B2 150D156X9020B2 150D156X9020B2 0160 0576 0160 2213 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 2225 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 HP204571PF3C1 0160 0576 0160 0576 0160 0576 DM15E390J0300WV1CR 0160 0576 0160 0576 HP204571PF3C1 150D106X9020B2 150D106X9020B2 0160 0576 0160 0576 0160 0576 15D106X8020B2 15D106X9020B2 15D106X9020B2 0160 0576 MD15E390J0300WV1CR 0160 0167 0160 0167 0160 0576 0160 0576 0160 0576 150D106X9020B2 0160 0576 1500106 902082 150D106X9020B2 0160 0340 0160 3281 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 2222 HP204751PF3C1 1500106X9020B2 GO2044751PF3C1 HP204751PF 3C1 0160 0576 0160 0576 1500225 9020 2 150D225X9020A2 HP204751PF3C1 HP204751PF3C1 HP204 51PF3C1
102. 4 470 8 3 072 2 3 i 4 555 250 t o 9 9 0 622 lt lt 922 22 20 5 3 2 522 8 2 D 19 9 2 Z 6 2 Sid 5 5 22 2 82 id 8 52 r2 to ey 20 PD C UD d 2042207 1ueuoduio2 5 py 56 8 5 5 882 9885888282185 4 om o w 1 85 338 G pa _ BE 2282 U A38 DIE 8868 6881 128983 5 as are E 3915 m 8 3 22157 3212 _ 22 OSE 5 88 8 1 SEQQS SE6 Q 190 452 529 42 522 riy 5 0 A LA 5 3 E S 8 9 osn B Gi gen 1 8 9 99 ovr 5 5 9 ren 5 9 1 2 9 zen 9 bd ion 3 orn 4 ecn 9 3 zen 9 3 gen sen 5 3 5 4 rm zen L3 ocn B i 4 9 3 62 FA 9 3 gen 4 ma 5 3 sen d i 4 1 3 L 8
103. 4 MISCELLANEOUS PARTS 0360 0124 CONNECTOR SGL CONT PIN 04IN RSCSZ RND 28480 0360 0124 1200 0666 SOCKET XSTR 3 POWER DIP SLDR 28480 1200 0666 1251 4259 CONNECTOR SGL CONT PIN 031 IN BSC SZ 28480 1251 4259 1251 5063 CONNECTOR 6 PIN M POST TYPE 28480 1251 5063 Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued HP Part Number Description 04935 60005 CHARGER BOARD OPTS 001 8 003 Part Number Reference Designator AS 04935 60005 0180 0291 CAPACITOR FXD 1UF 10 150D105X9035A2 A5C2 0180 1746 CAPACITOR FXD 15 10 20VDC 150D156X9020B2 0190 0097 CAPACITOR FXD 47UF 10 35VDC 150D476X9035S2 ABCA 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A5C5 0160 0576 CAPACITOR FXD 1UF 20 50VDC 0160 0576 ASCE 0160 0576 5 1UF 20 50VDC CER 0160 0576 5 7 0160 0576 5 CAPACITOR I XD 1UF 20 50VDC CER 0160 0576 5 0160 0576 5 CAPACITOR FXD 1UF 20 CER 0160 0576 1 3 DIODE SWITCHING 80V 200MA 2NS 00 35 1901 0050 3 DIODE SWITCHING 80V 200 2NS D0 35 1901 0050 3 DIODE SWITCHING 80V 200 2NS 00 35 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS D0 35 1901 0050 5 5 3 DIODE SWITCHING 80V 200MA 2 5 00 35 1901 0050
104. 8 24 8 25 8 26 8 27 8 28 8 29 8 30 8 31 8 32 8 33 8 34 8 35 8 36 8 37 8 38 6 39 8 40 8 41 Title Page Signal Frequency Spectrum 8 41 Transmit Signal Envelope 8 42 20 Hz Waveform 8 43 Transmit Monitor Test Output 8 44 4935A Signal Flow Block Diagram 8 67 Al Front Panel Schematic Diagram 8 60 A2 Switchboard Component Locator 8 70 A2 Switchboard Schematic Diagram 6 71 A3 Receiver Board Component LoC Or yu suu iu uuu 8 72 Board Component Jo ce agree 8 72 Receiver Board Schematic Diagram Sheet 1 of 4 8 73 Receiver Board Schematic Diagram Sheet 2 of 4 8 75 Receiver Board Schematic Diagram Sheet 3 of 4 8 77 Receiver Board Schematic Diagram Sheet 4 4 8 79 A4 Transmitter Board Component watches erect 8 80 Al4 Transmitter Board Component en 8 80 A4 Transmitter Board Schematic Diagram Sheet 1 of 5 8 81 A4 Transmitter Board Schematic Diagram Sheet 2 of 5 8 83 4 Transmitter Board Schematic Diagram Sheet 9 of 5 8 85 A4 Transmitter Board Schemat
105. 9 4 6H 07 2 53 152 i 5 6 amp 2 59 6 H 932 E 2 ig sn 5 3 90 4 LH 6 3 252 si 1 pL I ER od i or 95 59 015 LG 9 63 155 ae E n i w 6 H ssn 18191 40 GH 55 2 63 052 i LM wn uj 22 SH 3 670 slaj n esa eg sety 2015 92 OZH 6 283 870 9 Is 250 13 reid 5 23 EH isn zo 29 66 6 il 97o isp oa 69 osn 22 z8iu 88H ib 22100 SvO WM E 8 9 zr 29 464 52 LH 210 53 fab LH Lyf 6H ie 955 wg Sig LH 5210 3 3 i 3 3 Sen or 6 4 vsu Ivo 221 99 wi st 83 68 22102 23 855 MEC 59 s r 6 4 68 y SH zo 155 SY g rd st 2113 83 168 98 88 0215 ae E is eo Orn gr 3 064 98 t9 6121 StS dw 6 3 sr 9 12 FED fet iR 1 8 3 sf 93 99 98 sy
106. A3R187 A3R201 202 203 A3R204 A3R205 A3R206 A3R207 A3R208 A3T1 P Part umber 0698 8858 0699 0164 0757 029 J 0757 0290 0698 6423 0698 6754 4537 98 7585 2100 3883 0698 6360 0698 6360 0698 8068 0699 0597 0698 6447 0698 6446 0699 0592 06985360 069 6360 0699 0591 0757 0443 0698 7847 0698 6360 2100 3883 0757 0280 0757 0421 0757 0401 mu 9797 45 0757 0458 0757 0401 0698 4002 181 0369 0698 6445 081 3587 91 W 3489 NINMNOOD O gt Qty Description RESISTOR 12 4K 1 125W F 0 25 RESISTOR 736 5 1 125W F TC O 25 RESISTOR 6 19 1 125W F TC 0 100 RESISTOR 6 19K 1 125W F 0 100 RESISTOR 31 25K 1 125W F TC 2 RESISTOR 44 2 596 125W F 0 50 RESISTOR 357K 1 125W F TC Ot 100 RESISTOR 316 2 1 125W F TC 0 25 RESISTOR TRMR 5K 10 C TOP ADJ17 TRN RESISTOR 10K 1 125W F 0 25 RESISTOR 10K 1 125W F TC 0 25 RESISTOR 10K 1 125W TC 0 25 RESISTOR 15 758 1 125W 0 25 RESISTOR 287K 1 125W F TC 0 100 RESISTOR 4 12 1 125W 0 25 RESISTOR 2 21K SSW 0 25 RESISTOR 10 7K 0 50 RESISTOR 4 99 2596 125W 0 25 RESISTOR 2 26 125W TC 0 25 RESISTOR 6938 1 125 0 25 RESISTOR 2 162 1 125M 0 25 RESISTOR 7 741 1 125W
107. Ad ee eee 10 004 py 52 8 anid 8 9 012 2 0 rin ca 8 5 9012 SEBEIS SEE VG pe pie a a 22 9 9 FOLD ca 5 9 515 B A S Le 3 on 59 2012 22 2 en 9 9 vtu 59 52 8 5 5 9 0012 an TY 2 3 662 p x en 3 960 8 piy u Em 22 sn 160 L Lo n 8 5 9 3 962 1 9 en 6 2 223 5 3 562 zn 43 5 4 s 3 95 9 8 in 3 rd 62 E im kai 2 0 42 162 iH ilal 2 3 062 8 H o 23 ego 2 LH idl r3 992 q S H D 1 3 95 8 rA 2 3 31 1 8 980 e rs Fal ea Sty Seo 9 8 i 790 B gin 5 5 8 1 0 teo E o a m cB 182 5 5 095 i i 2 8 615 gt 9 zozu B8 922 o 1 8 110 r5 oozy 5 3 942 95 0 i8 SH 1 0 2 5 3 8 9 ru 3 2 001 1 8 9 3 iD LO 555 9 8 92 25 eod 9 B Ly eS 190 2 9 263 592 I 96H 795 3 695 t 90 PSH 92 ca 8 8 rH 989 9 8 8
108. CHANGE 5 Delete 13 206 HP Part No 1810 0369 RESISTOR NETWORK 100K x 5 Delete AI3R207 HP Part No 0698 6445 RESISTOR 6 838K 1 Add 13049 HP Part 1826 0735 IC HA 2507 5 Change 7 to HP Part No 0360 0124 TEST PIN Change AL38TP9 15 to HP Part No 0360 0124 TEST PIN Page 6 33 Table 6 3 Replacement Parts 13 Receiver Board Change AIAR88 to HP Part No 0698 8824 RESISTOR LOK 1 Change AIAR89 to HP Part No 0698 8824 RESISTOR 190 Page 8 78 13 PAR Receiver Component Locator Heplace with Figure 7 9 Page 8 79 A3 Reciever Component Locator Replace with Figure 7 10 Page 8 79 Receiver Board Assembly Sheet 1 of 2 Replace with Figure 7 11 Page 8 81 A3 Receiver Board Assembly Sheet 2 of 2 Replace with Figure 7 12 CHANGE 6 Page 6 17 Table 6 3 Replaceable Parts Replace A4 with 04935 60103 Transmitter Board MFG CODE 28480 MFG P N 04935 60103 Page 6 18 Table 6 3 Replaceable Parts Replace A4CR17 with 1901 0731 Diode pwr rect 400V 1A CD 4 MFG CODE 03508 MFG P N 15 Replace A4CR18 with 1901 0731 Diode pwr rect 400V 1A CD 4 MFG CODE 03508 MFG P N 15 Add A4CR21 1901 0754 Diode pwr rect 50V CD 4 MFG CODE 03508 MFG P N Add 4 22 1901 0754 Diode pwr rect 50V CD 4 MFG CODE 03508 MFG P N A15F Page 6 31 Table 6 3 Replaceable Parts Replace A14 with 04935 60107 Transmitter Board MFG CODE 28480 MFG P N 04935 60107
109. LPF C60 1100PF R62 1 33K 14 13 VOLT TO FREQ CONVERTER 5 TENET C50 1200PF JU2 M M TRUTH TABLE FOR U13 1 JU2 ADD DIP P O ARNG P1 RCV GAIN JU7 J1 TO MONITOR SPEAKER NOTE J1 IS NOT GROUNDED DATA BUS PAR PEAK Y 8 D G P O Pt AVE DETECTOR Service 35 TO A4 14 36 TRANSMITTER ASSY TO U6 SHT 4 TO U57 3 5 SHT 4 TO US 2 SHT 4 TO U2 11 SHT 4 TO U57 14 SHT 4 14 TO A4 A14 TRANSMITTER ASSY TO U2A 7SHT 4 50 17 TO A14 TRANSMITTER ASSY P1 IMP 1 SHT 4 35A13SH3 Figure 8 32 Receiver Board Schematic Diagram Sheet 3 of 4 8 79 A3 A13 RECEIVER FROM J42 2 SHT 3 PAR PEAK FROM 013 1 SHT 3 PEAK FROM SHT 3 FROM A14 TRANSMITTER ASSY 20 FROM SHT 3 FROM U13 15 SHT 3 FROM U13 4 SHT 3 FROM 013 13 SHT 3 FROM U13 2 SHT 3 413 RECEIVER BD ASSY 04935 60035 REV A SERIES 2822_38 IMP PEAK Be i et e SOLON SS 1 1 P O R15 c HH 100K EA 6 2315 73 8 6 4 14 45V R2 10K 6 14V 5 N C14 N 0 1 14 4 4 14V TPS R4 585 10 3 13 MM M 22222 C9 12 0 1 R
110. RI21 8137 15 758 US B 2 a 10 V 100 8136 RIBI l iB ITIK 34 33 10K 4V I5 758 E m _ 2 7 21010 gt FROM A4 TRANSMITTER ANALOG GROUND SERIES 2247A a F NOTE 5 ANALOG SWITCHES DRAWN AS THEY WOULO BE WITH A LOGIC ON 91235 i THE CONTROL INPUT 2538 738 5 i 1 C66 TOOPF RBO 2 365K Rea cba 29 4K 432 Ras TOOPF D 3 gt gt 9 T 4 1 R87 V 29 4 0 14 C MESSAGE FILTER 79 c 4751PF mer RIO3 RIOS 2400PF 9 C84 0 2400PF 3 12 4K cao 2 300PF 82 5 200PF 2 U368 17 4K 17 4 R106 RIOT 5 12 4 R109 ROA 4 ry 9090 9090 19 usec cas ITOOPF CHI 9 T 22 0 R127 R128 2 1 44 2K 357K V d B PROGRAM FILTER wer ae c Lo 2 400PF TPI5 4 R104 8126 e gak E 3 26 31 2 NOISE FILTER INPUT
111. Set the displayed frequency the right display to 995 Hz Adjust the OUTPUT LEVEL until the left display reads approximately 0 0 dBm Pres DISPLAY to select RCV mode Move the JU5 shorting bars to the right short pin 5 to 12 6 to 11 7 to 10 and 8 to 9 Connect Oscilloscope to JUS pin 1 Adjust R102 995 Hz for minimum AC signal on the Oscilloscope Change the frequency to 1010 Hz using STEP UP button Connect Osdlloscope to JU5 pin 4 Adjust A3RI 32 1010 Hz for minimum AC signal on the Oscilloscope Change 4935A frequency to 1025 Hz using STEP UP button Connect osdlloscope probe to Adjust 80 1025 Hz for minimum AC signal on the Oscilloscope Move JU shorting bars to original positions shorting pins 1 to 16 2 to 15 3 to and 4 to 13 5 1 Adjustment Calibration Model 4935A 5 18 ADJUSTMENTS P AR Filter and Latch Adjustments Options 002 and 003 REFERENCE A13 Receiver Assembly EQUIPMENT Oscilloscope HP 1741A with 1 1 probes PROCEDURE Oscilloscope select vs B operation and connect the probes to the normal input jack l or HP model 180 series oscilloscopes feed one input to channel and other to external horizontal input not the external trigger input b This setup will display lissajous pattens which are used to adjust the P AR filter If an adjustment is needed rising slope oval waveshape is produced d Whe
112. X 2 aa i DUM IND z als peed 9 OSISIM 1 f Ft 50 9 I 1 324 538 j S ee POS S gt _ _ ASST HillIWNSNYMQ vY MOUs 10 Ar 455 00 mE 2186 7 5 __ 830 ASSY 0 74 29 IME WSNUsS 1952842 yen 3 0 i 2 T7 NUS 15 A DENDO _ X 23328 SY BALiINSNYMI SF gt gt i De l S 27 NBOHS AVIVA 12 83AY iN3NOdMOJ 03123735 S AMOLIVG S3 YOTONI XSIB3iSv os i S3 bN3MOMO N NI 32NY1200NI 85 SOvavs0O4O N NI 32 411244 2 SWHQ NI 19 18153 61 16 S amp 3TNC 7 SL 0812 dOLV ONDNNY ONT Aq TROC ESSE AE gt 1 Ci H3BHMONM 7091557 Jjivi ijBBU JYV 7864355 NIMIQN NSIS 30 j2N3H3438 340 IP F F a e a a m a 4 9 41 a 8222 3214 20199 55670 1972512 HOLIMS 27 2 SWITCH DISPLAY 04935 80102 REV B 2204 lt ee o R
113. k eh a TE 394 B M uL mob f 2 sias AFi i i i 3 Ih 4 h 20 ga ead 4 i S a og 5 J le 2 63 jes s 4 le 4 ales a 5 ME 52 pa igs re 5 3 i a e G i CX i m 4 wid Srey VI ix x 3 3 2 Dao c b C E id i 6 4 f 4 4 i um 0 5 uu 2 els 2 3 uod EY peer im i 3 m RCM 93 19 L t ne SACRA i in Y U 1 Lu 5 1 T m D 54 ei 4 vendes u 12 re RBA E Bia au z gt E E 351 74 i Sioa lt i Y ow E UE 6 2 iy oo 4 5 4 5 3 1 1 i 51575 4 4 al 4 5 RO 1 ad M MEA ea ENS ese oo eg amp oro 4 i a P 2 EE Ju t ther x 6 bray ELS i Fa d 2 1 7 T RYRY
114. lt 918 riy 888885809288 ID 8 9 69 9 9 D 9 5 9 5 9 2032207 jueuoduio7 pyeog 5 py 65 8 2814 5012 50 9 015 20 0 1019 00 2 862 962 462 555555888 3883888885888 2 042 182 592 792 92 ego 5655 SO 88888588388333338338 zo ogo 252 912 520 rit cid LD TRUTH TABLE FOR 011 14 FREQUENCY MEASUREMENT CONTROL FUNCT I ON 11 X x x FREQUENCY SELECT sec READ ENABLE IMPED STATUS ENABLE iX x x 0 READ DISABLE IMPED STATUS DISABLE TRUTH TABLE FOR U12 9 x x o x emet option sevect surrer x x ERO MEASUREMENT O x x X SELECT LEVEL TO COUNTER 1 SELECT EVENTS TO COUNTER 1 MISC CONTROL P O 4 A14 TRANSMITTER BOARD ASSY 04935 uen IMPULSE NC M erm me eee 5V 5V 0 R10 825K 19 8 IMPNH Yasa ONE R9 C1 45V i SHOT 2 2 J 8 d LEVEL SIGNAL T LJ l R47 14 7K AVE DETECTOR DC 3480 AUTORANGE S GNAL SINE WAVE R48 DARD ASSY 04935 60034 REV A 2830 88 7
115. pases ro I i 1 R gt Y Kr BOZ I NT BL Y AU HOT anA EEE EF NT BL GR a iQ dd AC COM C66 Pees Sag 0 1 tO d 1 i a 4 I 1 uu UNS C40 Y x d GROUND PLANE V CHASSIS GROUND PLANE RI 5 2200 I x CURRENT TO VOLTAGE CONVERTER RES T RUE 8250 21 224 R4i E R67 4 1000 ii mre tats cl t 4 D w C46 1 be gt i Q i 4 25 1 R R69 es 7 E 6 mays M 825 750 3 10412 v y IN lt R44 3 12 je uss ED i200P E o sd ge 1200P T 9 1 17 y T 19 WIDEBAND x E LOW PASS FILTER SINE TRANSMIT pL A eei ETE 0 1 4 RBE R85 2 17 DIT 10K 5 79 3 i 9 NA 4 T 4700P NE
116. vH so t aco sr 84H oro j je er 9 3 952 v 6 ovg zo Sto i 6 01 8 lo ry vto f 9 ry Cd 1 j 92 Z i 2 me RENE 1 1 2222224 sj js ACT D 234907 109 Q eii e2 amp 4 T 9 9 9 0 6 3 055 ve it L oj 400 of t 5 3 620 522 21 sel 402 1 1 E 5 4 69H gv enr id 922 zd l 16 af 2 15 82 pine 93 72 12 ivt si n d n iv si n je 4 94 6 3 anr 25 x ae vu jf o je esu 63 sant 222 1 we ay See eee s org 122 lo ie lon 9 inr ora 022 is 2 s 545 Cean er 62 gt iv le 3 3 er 5 5 915 i ds i 1 4 M p E om L ven 53 99 so ro 512 9 14 9 li i 9 3 099 0154 1955 oro Pio ee il mm ode a c EIS 91 3 zen sa 658 ELD es je al ois P i v s 6 3 ocn 5 4 858 ZH 6282 215 sess TET 54 j z 8 3 2n 5 4 158 8240 Lu LLO on 1 plo azn Si 959 1239 5 9 012 ra ig gzuo ag 62 2 3 920 rau 01 0 seuo
117. w 5 i r 9 71 t PY 4 aS d 3 4 1 4 a l i GN i e gt Mes E i E orn 2 al 4 E E 5 n 1 DE LI D LE 4 1 wo s t 2 a DERI 12 P 7 ge i 4 5 xs Fos 4 ob ed i AD A gt K M k 4 gt 9 ie s 2 5 1 gored NEL 40 E E a n 146 S 4 4 f 4 4 4 H 2X 13 LET 4 2 T g C E Pf i 4 24 t 2 6 a 2 Y oq 9 i m DES 194 4 5 iz r 4 5 a H 4405 4 a i 4 3 U 1 h 2 lt y 3 Ut M E 12 x LT i 3i 2 t j t5 7 f e 9 e S 4 6 18 f 4 Re y r Cor tore yy t Yos 2 id PN E jr H i 185 H R Er LSH 19 Eis ee rebut UM 1 516716 alt d h PSP ne 2 C EE op i 2 051 penas gt g INOT DAU TS 7 22 2 2 2 2 js ee D
118. 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD O1UF 1096 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 CER 0160 6500 CAPACITOR FXD 01UF 10 CER 0180 8500 CAPACITOR FXD 01UF 10 CER 0160 8500 CAPACITOR FXD 01 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 CER 0160 6500 CAPACITOR FXD O1UF 10 CER 0160 6500 CAPACITOR FXD 01UF 1096 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 8500 CAPACITOR FXD 1UF 2096 SOVDC CER DIODE ZNR 5 11V 5 00 35 4W 0160 6623 1902 0041 DIODE GEN PRP 180V 200MA 00 7 1901 0033 DIODE PWR RECT 400V 1A 1901 0731 DIODE ZNR 18 0V 2 PD 4W INS248 DIODE PWR RECT 400V 1A 1901 0731 DIODE PWR RECT 400V 1A 1901 0731 DIODE PWR RECT 400V 1A 1901 0731 DIODE PWR RECT 400V 1A 1901 0731 DIODE GEN PRP 180V 200MA 00 7 1901 0033 DIODE GEN PRP 180V 200MA 00 7 1901 0033 DIODE ZNR 18 0V 2 4W INS248 DIODE PWR RECT 400V 1A 1901 0731 DIODE PWR RECT 400V 1A 1901 0731 DIODE PWR RECT 400V 1A
119. 1 3 een rz 9 3 en 9 3 oen 5 4 8 5 5 3 ea zen 9 3 9 3 gzn ien 5 3 4 sen een t 3 ozn 6 7 2 0 gin 2 9 sin UU sin Q d 20Bo H Ag DIE 88 8 1 009 SEGPO sin C 26 J o 2 9 fe a CIE e jJ FE 055 2815 1 Met fe 55 7 2282 A3 012201 pieog py amn id 9 4012 283 5 4 203 u 6 9 E 59 in an B 5 9 2012 1019 ety 9 042 geo 8 9 3 162 L 9 4 962 5 4 5 4 9 5 s B 69 16D ea 02 I ea In 8 3 2 3 r3 seo 8 0 Bin G te TS 2 8 63 gu 8 4H 42 5 3 9 2 Su ia 2 2 2 gt ty 3 uo 92 aD iM 29 482 p 592 90 rH 3 50 ca 92 CET Cas t gt 5 952 Cz 3 a ID 015 9 r95 2552 5 2652 rd 870 r3 r3 S ea 277
120. 14 25 14 26 14 27 14 28 14 29 14 30 A14C31 A14C32 A14C33 A14C34 14 35 A14C36 A14C40 A14C41 A14C42 A14C43 A14C44 14 45 14 46 A14C52 14 53 14 55 14 58 14 57 A14C58 14 59 A14C60 A14C81 A14C62 A14C63 14 84 14 85 A14C67 A14C70 A14C71 14 72 A14C73 A14C74 A14C75 A14C76 A14C77 A14C78 14 79 A14C80 A14C81 14 82 0160 3815 0160 3815 0160 3815 0160 6623 0180 3045 0180 4017 0160 6623 0160 6623 0160 6623 0160 6623 0180 3045 0180 2945 0160 3456 0160 6623 0180 3044 0160 6623 0160 6623 0160 3456 0160 6623 0160 6623 0160 6623 0160 4791 0180 4807 0160 4807 0160 4807 0160 4807 0160 6623 0160 6623 0180 3050 0160 6623 0160 6623 0160 6623 0160 6623 0180 0058 0160 3094 0180 6623 0160 8623 0160 7099 0160 7099 0160 6623 0160 6623 0160 6623 0160 6623 0160 0127 0180 3124 0160 6595 0160 6595 0160 6595 0160 6623 0160 6623 0180 0197 0180 0197 0160 6623 0160 6623 0160 6623 0160 0127 0180 0374 0180 1746 0160 4833 0160 4835 0180 0291 0160 6500 0160 6500 0160 6500 0160 6500 0160 6500 0160 6500 0160 8500 LED 04935 60035 Q OOO Qoo NANEN ANNAA NOU FAA Description A14 TRANSMITTER BOARD Par Units only TRANSMITTER BOARD WITH PAR CAPACITOR FIXED 15UF 4 596 50VDC
121. 2 Connect Voltmeter to A4JU 5 5 Voltmeter should read 5VDC 20 mV If not adjust A4R42 5 V ADJ 4 Remove the Voltmeter and connect the Oscilloscope to A4JU 5 Ripple should not exceed 100 mVAC 5 Connect the Voltmeter to A4JU 14 6 The Voltmeter should read 14 VDC 20 mV If not adjust A4R31 14V ADJ T Remove Voltmeter and connect the Oscilloscope to A4JU 14 Ripple should not exceed 100 mVAC 8 Connect Voltmeter to A4JU 14 9 The Voltmeter should read 14 VDC 25 mV and is not adjustable If the reading is incorrect power supply is defective and should be repaired 10 Remove the Voltmeter and connect the Oscilloscope to A4J U 14 Ripple should not exceed 100 mVAC 5 3 Adjustment Caltbration Model 4935A ADJUSTMENTS 5 14 Output Level and Transmit Monitor Loop Adjustments REFERENCE A4 Transmitter Assembly SET HP MODEL 4935A VOLTMETER Eod qr O b Figure 5 1 Output Level and Transmit Monitor Loop Adjustments PROCEDURE i Connect Equipment as shown in Figure S l R 600ohms 2 4935A select DISPLAY TRMT NOR REV NOR MEASUREMENT LEVEL FREQ SET UP press in TRMT 600 press in RCV 600 BRG out DIAL out both HOLD3 out OUTPUT LEVEL turn full clockwise Jj Adjust A4dR74 OUTPUT ADJ for a reading of 3 42 to 3 43 Volts the 4 Ad just the OUTPUT LEVEL for a reading of 775mVrms 9 Move the AC VM to A3TP25 6 Ad just A4R7
122. 2 FLAT FILTER 15 2 7 A 4 N ern DV C104 14 Re 2400PF 404 3 ree R124 R125 15 5 ofi epee 6190 6190 6 2 e103 1200 50 KILOBIT FILTER f C121 1700PF C124 2400PF TP15 6 R144 4990 C137 5224 1700PF b 7 2210 C125 1700PF 55 6 U46B R143 R160 100 M 2 C123 2 10 7K 1200 9m R158 V 8 2260 10 R159 Y 2260 pees ee ee C97 4700PF esd R90 a 25 5K 14V R113 25 5K C115 3M 7 0 1 114 6 360PF 2 4 C112 0 1 14V V Nu M 226 or exta C79 5100PF C81 C 2400PF 24 R103 21 62K R106 R107 12 4K 12 4K R109 R108 C80 2 18 17K 6K 300PF 1200PF C111 1700PF PROGRAM FILTER 5V U11 1 15 AO BEBE 5 __ 15 2 U37 _____ 7 gt ae aa ae 5E R181 2 1000 V Service CB4 2500 09 R108 17K SK TP15 3 C85 C87 1700PF 1700PF C111 1700PF 1 DO 3 Di o D2 21 CIRCUIT APPLIES TO P AR UNITS ONLY TO U50A 9 SHT 3 NOTES 1 REFERENCE DESIGNATION WITHIN THIS ASSEMBLY ARE ABBREVIATED ADD ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTION 2 UNLESS OTHERWISE INDICATED RE
123. 2048 locations and 1024 ten bit points of P AR waveform in an additional 2048 locations The desired waveform is selected by switching the 12th ROM address bit with the sine P AR select signal clock select 8 113 Circuit Description 8 114 There are seven circuits in the transmit signal generator DIGITAL SIGNALS ANALOG SIGNALS SERIES 12 5 ROM INPUT IN APPROXIMATION BINARY GENERATOR LATCHES SERIES CONVERSION FORM OF BINARY FROM uP VOLTAGE VALUES SELECT SIGNALS ue OUTPUT OUTPUTS TO SWITCHBOARD SIGNAL AMPLIFIER FRONT PANEL 310 JACKS SELECT LOOP AROUND BUFFER TO RECEIVER BOARD Figure 8 12 Transmitter Block Diagram 8 21 Service Model 4935A 8 115 TRANSMIT CLOCK GENERATOR The transmit clock generator provides the proper clock frequency to the phase address generator waveform ROM and ROM latches It also provides a 262 kHz signal to the microprocessor and counting circuit where it is used when measuring frequency In the standard model only the sine clock circuitry is provided 8 116 In P AR models options 002 and 003 sine and P AR clocks are provided as well as a multiplexer 030 The P AR sine select signal from U26 pin 1 low sine clock selected determines which clock is enabled 8117 PHASE ADDRESS GENERATOR The phase step latches hold the binary value of the frequency This value changes only if the frequency is ch
124. 4 2 4 9 s s st s s o 5 s 4 e c 5 9 9 8 9 amp 9 SA 6 7 7 7 7 7 5 7 ADY ues 2 GNO JUMPER WIRE a ed 4 Lu m 6 1 1 6 T ao 5 hs 2 y ps 2 15 I 2 2 14 3 2 14 3 2 Iw 3 2 143 3 14 T i4 3 4 7 cas 4 13 4 3 134 4 13 S l 8 14 6 7 8 9 2 32 9 13 5 6 5 12 5 12 5 12 5 123 12 2 7 R 13 A 3 3 12 8 I u 8 u alaifai 4 3 6 5 12 5 4 14 2 10 4 2 gt 10 T 0 7 7 0 10 i54 12 Au U O 5 9 a 9 w 8 9 13 14 C32 10 6 a a 15 16 JUB js ja H CO ue 25 t 61 18 1 1 5 1 16 1 14 2 I5 2 15 2 15 2 1 2 15 2 15 2 CSAI s s 4 14 3 5 14 3 14 5 14 14 i 14 A 12 L 4 13 4 13 4 34 3 4 I3 4 3 4 3 hi 7 R amp Ed ass e 3 Jes he 5 da 5 s 7 he 595 s 9 ho oe NO ii B TE m u s 6 T 9 21225 2 t 16 2 10 7 10 7 a 3 bi ARP 5 u a 9 a a 9 37 38 4 39 40 Ma 4 13 4 1 14 41 42 2 3 Es 2 4 4 2 u 25 Bs 8 gt 4 24 M A73 a 4 LOOP 7 10 s 9 Q Q Q Q ura de a T nis
125. 8 13 PROC GUNG aa 8 37 Miscellaneous Circuitry 8 13 8 202 Digital to Analog Conversion 8 39 Receiver Theory of Operation 8 15 8 204 Filter and Signal Select Circuitry 8 40 I O Switching Hold Circuits 8 207 Output Amplifier 8 42 Terminato uya 8 16 8 210 Transmit Monitor 8 43 8 212 Receiver Troubleshooting 8 43 Model 4935A Section 8 217 8 219 8 222 8 225 8 227 6 229 8 232 8 233 8 235 8 237 8 239 8 242 8 246 8 248 8 250 8 252 8 254 8 255 8 257 Table of Contents TABLE OF CONTENTS Title Page 8 44 Overall Transmit Monitor Test 8 44 Transmit Monitor Signal 8 45 Noise d usu 8 45 Simplified Autorange 8 46 Detector Select 8 47 Inputs from Front Notch Filter 25dB Amp Tone Dropout Signal Path 8 47 8 48 Input Transformer 8 48 Noise to Ground Input Path Noise to Ground Units only 8 48 Tone Dropout Signal Path 8 49 Notch Filter 8 49 INOISE
126. C64 cx 0 1 2 65 ADJ N 5KHZ LOW PASS FILTER FOR TRANSMIT 2 ae sz er Oe ee ee 2 J 1 R72 500 N LOOP ADJUST P O REAR PANEL ASSY EA ino POWER SUPPLY SECTION aoo wan IER LAGE PARURE ER CD MM CRCWBAR OVERVOLTAGE yj PROTECT CIRCUIT p 5V 8 OVERVOLTAGE SENSE CR26 C20 T 1000P 1 L 621 R35 Tost 10K REAR _ _ PANEL ASSY c JU 14 1 HEAT SINKED PART OF 2 2 2 14 T 0 3 W b du C62 0 22 GROUND PLANE JU 14 00 PART OF J 12 i 44V OVERVOLTAGE SENSE R2 P O REAR 10K PANEL ASSY 1 M hy R74 esp RO 0 2 OUT PUT SA ri il SINKED othe ie ee HEAT SINKED MO UNDE Lr p tr ee E I I OO0K ON P Q J2 5 14 8 gt 7 2 NC o 9 EU TO SWITCH BOARD P 8936 Jl ANALOG OUTPUT 34 JI RECEIVER J3 TO A2 SWITCH BOARO Manual Changes P O
127. OTUF 1 20 VDC CER 08113 HP204751PF3C1 A3C92 0160 6405 1 CAPACITOR FXD OTUF 1 100VDC MICA 28480 0160 0578 A3C93 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 94 0160 0576 5 CAPACITOR FXD 1UF 20 CER A3C95 0140 0177 0 1 CAPACITOR FXD 400 190 MICA a T A3C97 0160 6317 4 CAPACITOR FXD 4751PF 1 300VDC MICA 28480 0160 0576 A3C98 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 56289 1500106 902082 A3C99 0180 0374 3 CAPACITOR FXD 10UF 10 20VDC TA 08113 HP204751PF3C1 A3C100 0160 6405 1 CAPACITOR FXD 010 1 100VDC MICA 101 0160 6405 1 CAPACITOR FXD 010 19 100VDC MICA 28 gt 102 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 3291 A3C103 0160 3291 7 CAPACITOR FXD 1200PF 1 100VDC MICA 28480 0160 0218 A3C104 0160 0218 2 CAPACITOR FXD 2400PF 4 195 300VDC MICA 28480 0160 0576 A3C105 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER A3C106 0160 0576 5 CAPACITOR FXD 1UF 20 CER 58 52 2 107 0160 3291 7 CAPACITOR FXD 1200PF 1 100VDC MICA 28480 0160 0218 A3C108 0160 0218 2 CAPACITOR FXD 2400PF 1 300VDC MICA 28480 0160 0576 109 0160 0576 5 CAPACITOR FXD 1UF 20 50vDC 28480 0160 0576 A3C110 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER A3C111 0140 0235 1 1 CAPACITOR FXD 2250PF 4 196 300VDC MICA eaten Dien e A3C112 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A3C113 0160 0576 5 CAPACITOR FXD 1U
128. Options 002 and 003 only 8 17 Service Model 4935A 8 87 C MESSAGE FILTER The C Message filter consists of five second order networks The first section is high pass network the second is a band pass and the third fourth and fifth are low pass networks Filter gain at 1 kHz is 0 dB 8 58 PROGRAM FILTER This filter has three second order low pass cascaded sections and one second order high pass 8 59 FILTER This is a second order Butterworth low pass filter The dB frequency is 3 kHz 8 90 1 gt kHz FIL TER This is a second order Butterworth low pass filter The 3 dB frequency 18 15 kHz 8 91 00 kBit FILTER This filter consists of a high pass network two low pass networks and a low pass network with a notch It has a 3 3 dB attenuation at 30 kHz 8 92 PAR FILTER OPTION 002 and 003 The PAR filter consists of two band pass filters connected in series The pole and zero frequencies are identical in both stages The gain at 1300 Hzin the first section is 5 61 dB In the second stage the gain is 4 78 dB 8 93 The microprocessor controls the filter multiplexer s selection of the desired signal from the different filter outputs and routes it through a buffer amplifier to the autorange circuit 8 94 AUTORANGE AUTORANGE il 20 dB MICROPROCESSOR Figure 8 10 Autorange Block Diagram 8 95 The autorange circuit amplifies signals up to 60 dB in 10 dB steps or attenuates the
129. PIN 6 PIN 6 PIN 6 FREQUENCY STAGE 1 STAGE 2 STAGE 3 Model 4935A Model 4935A Table 8 21 4935A 110 kHz Low Pass Filter Filter Input 0 50 volts output in mv U33 U28 U26 PIN 6 PIN 6 PIN 6 FREQUENCY STAGE 1 STAGE 2 STAGE 3 8 285 order to check the filters accurately the 4935A can be used asa measuring device To measure use a synthesizer as the input and set 4935A on LEVEL FREQUENCY and RCV Next remove the shorting bar on JU1 and replace it with a DIP switch Using the table for the filter MUX U37 given on the schematic one can manually control which filter is switched in and can read the display to check the filter response Table 8 22 Bell 41009 C Message Filter Filter Input 0 0 dBm ACCEPTABLE OUTPUT LEVEL FREQUENCY minimum maximum 8 63 Model 4935A Table 8 23 Bell 41009 3 kHz Flat Filter Filter input 0 0 dBm ACCEPTABLE OUTPUT LEVEL FREQUENCY minimum maximum Table 8 24 Bell 41009 15 kHz Flat Filter Filter input 0 0 dBm at given frequencies ACCEPTABLE OUTPUT LEVEL FREQUENCY minimum maximum Table 8 25 Bell 41009 Program Filter Filter Input 0 0 dBm ACCEPTABLE OUTPUT LEVEL FREQUENCY minimum maximum 8 04 Model 4935A Service Table 8 26 Bell 41009 50 kBit Filter Filter Input 0 0 dBm ACCEPTABLE OUTPUT LEVEL FREQUENCY minimum maximum 0 2 32 4 2 3 EC Table 8 27 Bell 41009 PAR Filt
130. Pe PS 23 2 ie OTK amp pps Go curd EI V 200PF 7 164 8 758 13 665K io a 1 i RIBI pals 148 R163 IS 758x 108 502 7 741 13 665 p Gps Se 11 4 S Sh RI I E25 1025 Ne 0 9 x AER AR FILTER Ef anc m OPTIONS 002 003 ONLY IUF 1187 16 9K _ maar i n m Saa ru A N E ee V SW Ay conse fm c arae E a6 R83 DOK Av Sm vui F v lo MESSAGE FILTER 6 1 R90 84 2400 54 RIOA 9090 cas 3 1700 2 9360 Chil aj AT ame a 14 22 81272 8 28 13 114 xk RII 350PF amp 9K pte mr eos D 2 V L er N FILTER NOTE ONLY ON NOISE TO GND VERSION gt 1000 4 4 T T C TPI5 8 i C124 2400PF 8144 145 TPI5 amp 2260 Q u37 TRUT
131. Power Supply 3455A AC DC Voltmetei HP 3466A Milliammetet Connect equipment its shown in Figure 4 Check the power supply output with the DC Voltmeter Adjust the output to 6 9V 2 vDC 3 On 4935A select DISPLAY TRMT NOR press in SET UP press in TRMT HOLD press HOLD 4 The current on milliammeter should be 24 0mA 5mA 5 On the 4935A press the REV button Reverse the power supply leads The DC current readings should be 24 0 mA 5mA both the and RCV HOLD circuits Return the power supply to the normal polarity set monitoring Voltmeter to it voltage range of 50V or greater and adjust power supply for 50 VDC The DC current reading should be less than 26 mA Press button The DC current should be less than 26 4 20 Model 4935A Performance Tests PERFORMANCE TESTS 4 23 Distortion Test SETUP MODEL 4935A Q O OO 6000 LOAD Figure 4 1 1 Distortion Test EQUIPMENT HP 6934 Dual Output Power Supply HP 8903A Audio Analyzer 4 kHz Low Pass Filter included in Diagnostic Service Kit 20 dB amplifier included in Diagnostic Service Kit 2 310 to BNC adapter 2 BNC to BNC test cables 6000 load 1 Connect equipment as shown in Figure 4 11 2 On 4935A select POWER 5 2 aa Xe ER be oh oe DISPLAY oye ew es TRMT NOR 5 5 az g cs i toe TRUM b U
132. RCV P AR TRMT Display RCV Display T toggling Table 8 1 Measurements Summary NOTCH INPUT SOURCE SELECTED FILTER DETECTORS USED A3JU3 PIN XMIT MONITOR SOURCE Power Amp Xmit Monitor Output Input Transformer Xmit Monitor Input Transformer Xmit Monitor dient Transformer Xmit Monitor Input Transformer Toggling at 1 Hz Power Amp 1 Qut 1 Avg 1 Wideband LPF Avg 1 Wideband LPF 1 Out 1 Avg 1 Gnd Wideband LPF Xmit Monitor Avg 1 T Wideband 1 LPF input Transformer Out Avg 5 Toggling P AR Peak Input Transformer Xmit Monitor Input Transformer Xmit Monitor Signal to Gnd Power Amp Output 5 kHz Power Amp 1 LPF Output at 1 Hz 8 3 Service Model 4935 8 10 Level And Frequency 8 11 Once frequency is selected front panel and the level adjusted use the OUTPUT LEVEL knob the transmitter generates the appropriate sinewave The level measurement is made in the loop around path on the receiver board The loop around path selects the wideband low pass filter and the transmitter output to make its measurement When monitoring the transmit signal no frequency measurement is made If the input frequency and the output frequency are different the transmitter circuit should be repaired 8 12 DISPLAY RCV The receiver measures the level and frequency of a balanced input signal from the front panel RCV 310
133. SETUP Lo x Y SPARK Rev 562 e Oo 310 1 i RING RIGHT Rev NOTE T SWITCHES S2 53 DRAWN ca IN NORM POSITION a R7I 5 276 100 gt 971 8 190 C78 rd ol 6 9 973 m T 199 77 072 R77 10 a4 e 100 wy C78 R74 R73 T a i RCV HOLD CURRENT Q k a Ne RECEIVE HOLD CIRCUIT 3 TO gt FRONT PANEL l ASSY l MM OO a m a s e NE lt 2 E rs i 3 I i i 1 LIE TOU 3 d 110114 RES TRIG OUT DIS CNT THR eE 9 3 m 2 SWITCH DISPLAY ASSY 4V POWER 17 18 t A2 SWITCH DISPLAY TS 19 20 A4 ASSY 14 POWER I f I L i5 MONITOR AMP TWISTED PAIR IMPEDENCE SENSE LINES P PINS 10 12 SEM PUSH BUTTON a 46 gt 45 REVISED 10 82 LSS wass SED o amasasaasme NOTES REFERENCE DESIGNATIONS WITHIN THIS ASSEMBLY ARE ABBREVIATED ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTI
134. Socket pins through 20 should be at ground 1 volt b Socket pins 38 39 and 40 should be at 5v 4 1 v G No pin should be above 5v l v CAUTION When checking the microprocessor socket pins use a small probe to avoid spreading the socket pins Microprocessor socket pins are connected to STATIC SENSITIVE devices which can be casily damaged Ground yourself If any of the above conditions are not met troubleshoot and fix otherwise power down the 49354 and replace the microprocessor A4U6 and power back up t 3 Check the following pins on thc microprocessor A4 U6 Pin 40 should be 5v this ts Vee U6 b Pin 39 should be 5v I v tf it is grounded the microprocessor rescts Pin 38 should be logic high and pulse low when the PERIOD key is pressed this 15 the microprocessor Interrupt linc 4 Pin 20 should be ground Pins 7 through 15 22 through 25 29 30 and 33 through 37 should be toggling check with a logic probe After the self check 15 completed pins 3 through 6 should be logic high and pins 6 through 21 should be logic low NOTE Signal lines are generally checked at the IC pin but defective socket may stop the signal from to tts destination g If pin 38 does not work see paragraph 8 192 troubleshoot the Key Scan Circuitry and the front panel key matrix 4 Il any other pins are not as described above try inserting another microprocessor A4 U6 8 1
135. U26 selects the appropriate filter or a ground input for quiet termination as the input to the power amplifier NOTE JW5 puts a grounded input in place of the 5 kHz filter when noise to ground measurement is selected in the standard and option 001 instruments 8 206 To troubleshoot the transmit filters Remove A4J U2 2 Feed a 2 v sinewave to the negative end of A4C36 di Monitor the output of the wideband low pass filter at TP5 4 For each frequency in Table 8 4 check for the appropriate output Table 8 4 Wideband Filter Response 2 V P P 0 7 VRMS Input at A4C36 FREQUENCY VOLTAGE AT TP5 IN HZ P P 10000 40000 80000 120000 160000 200000 Monitor the output of the 5 kHz LPF at 11 6 For each frequency in Table 8 5 check for the appropriate output Table 8 5 5 kHz Low Pass Filter Response FREQUENCY VOLTAGE AT TP11 IN Hz P P T Check the output select MUX by selecting measurement and display modes according to Table 8 6 Check for the indicated waveform at the transmitter output or level control amplitudes may vary Model 4935A o 5 a lt Table 8 6 Output Select MUX MEASUREMENT WAVEFORM NOTES Set to 1004 Hz if necessary Sinewave 1004 Hz Level and Frequency Display TRMT Sinewave 1004 Hz Level and Frequency Display RCV Noise Display RCV DC level approx P AR opt
136. i yes i 1 M Jj sni isan B W CIE Pee 395 9 meis Cia Ue 13 1 6 3 8 0 i3 19d v3 3 082 e9 OP v2 645 8 3 sen 9 0 Griy 5 3 UO 82D gen 9 9 9 0 4 2 es 25 2 0 5 8 0 9 2 98D 8 2 9 3 gen eo 8 2 282 8 3 2 8 0 sen 59 3 099 BD 8 3 2 5 0 ven ro OF kd 5 0 854 2 2 tuo to cio t5 so 4589 192 19 e 8 5 zen 2022 8 3 4 2 ian 2 9 SSH 1022 02 9 Q ozn 9ciH 2 0 09 0 9 3 692 Q Zn TSH 2 5 3 892 e2 Sin 29 29H v3 2612 295 to sin i9 20 158 1519 7 3 992 z o vin t2 9512 t3 692 42 tin 94 8248 8 6b 5512 92 9 5 eun 9 9 7 evt LH SiD vg 9 2 5 9 ia Lrj 55 2 9 3 292 5 2 en t4 co ory 9 2512 8 3 182 v o n t co Sty 1619 5 0 095 2 en co 2 9 9712 650 8 9 sn rd g Ery 544 3 63 92 t 5 462 9 8 i 3 O2iH 8 5 eon 2 0 962 9 8 Ind I H 12 o 552 5 i 1 3 28921 EG 644 roo 2 0 Sedi 8 5 orto eso 9 0 Zal 191
137. in the environment or use of the equipment cannot be eliminated appropriate precautionary requirements shall be included blank Model 4935A Section Table of Contents TABLE OF CONTENTS Title Page I GENERAL INFORMATION 1 1 1 3 1 5 1 7 1 9 1 12 1 14 1 16 1 19 1 21 1 23 1 26 1 29 2 1 2 3 2 6 2 7 2 9 2 11 2 13 2 16 2 17 2 19 3 3 3 3 7 3 9 3 10 3 12 3 19 3 21 3 24 3 26 3 30 3 32 3 40 3 42 3 45 1 1 General Description 1 1 Instrument Identification 1 1 Se Cl CALTON Gs to etat dou dottor 1 1 Safety Considerations 1 4 Related Manuals 1 4 iudi 1 4 Options and ACCeSSOTIeS 2 4 44 44 1 4 1 4 Recommended Test Equipment 1 4 Battery Operation Opt s 001 amp 003 1 6 Charging the Batteries 1 6 Operating Temperature 1 6 INSTALLATION sedute estre t 2 1 Initial Inspection 2 1 Preparation for 2 1 Power 2 1 Laine Voltage Selecti fl oie 2 1 Power C ablegen i pid 2 2 Operating Environment
138. inside or outside the instrument or disconnecting the protective earth terminal can make this instrument dangerous Intentional interruption is prohibited HIGH VOLTAGE adjustment maintenance and repair of the opened instrument under voltage should be avoided as much as possible and when inevitable should be carried out only by a skilled person who is aware of the hazard involved Capacitors inside the instrument may still be charged even if the instrument has been disconnected from its source of supply Adjustments and service described herein are performed with power supplied to the instrument while protective covers are removed Energy available at many points if contacted result in personal injury CAUTION LINE VOLTAGE BEFORE SWITCHING ON THIS INSTRUMENT make sure instrument requirements match the voltage of the power source GROUNDING BEFORE SWITCHING ON THIS INSTRUMENT ensure that all devices connected to this instrument are connected to the protective earth ground ii BEFORE SWITCHING ON THIS INSTRUMENT ensure that the line power mains plug is connected to a three conductor line power outlet that has protective earth ground Grounding one conductor of a two conductor outlet is not sufficient Model 4935A IEC Symbols IEC SYMBOLS The following 15 a list Of key EC symbols used by Hewlett Packard All symbols are normally applied adjacent to the device requiring the symbol T
139. lines Functionally the 4935A consists of six parts 8 3 The receiver collects and processes test signals The transmitter generates test signals for making measurements The power supply provides power for the 4935A The charger controls battery operation The microprocessor controller processes data from the receiver and controls counting functions and general operation of the instrument The switchboard display interfaces with communication lines and the operator The microprocessor and counting section is the heart of the 4935A The microprocessor provides control and sequencing functions for all measurements The counting circuitry provides impulse noise detector processing frequency measurement and drop out detection 8 1 Service Model 4935 8 4 The receiver processes signals monitors frequency levels and provides signals to the microprocessor and counting circuits Ac input from the switch board or transmitter board 15 filtered and autoranged by the receiver It detects full wave average or quasi rms level of the signal Then a pulse stream with the frequency proportional to the level detected is sent to the microprocessor and counters It also sends information to the microprocessor if the incoming signal exceeds preset thresholds 8 5 The transmitter receives frequency and signal information from the microprocessor synthesizes the appropriate waveform and sends it out through the switch board which provides
140. oen amp 3 LH 8 3 gen tH 6 3 sen 3 3 in SH azn sa E H 5 5 ZH x rin i H 6 2 s9 8 0 zin e9 8 2 rH 9 2 en 5 gn 8 8 oH t8 on tn i p F lt OO we VU 207 51530 vd Zu ane enr sar enr enr inr LEBO 0853 6252 8280 9 8182 5 82 334 eer pr 3 gt gt 9 9 gt lt H 8212 5240 210 2210 ZZLD 12 0 0242 6LLO 8112 112 9 12 68442 PLLO ELLO 2113 1412 0112 5012 4045 8 3 195 9 O Ot 8 uJ u Q Li e t z m m 8 M 4 e ex n e u e ma O wn v Dire o non a a O O 940 7 A A FROM A4 TRANSMITTER Rw RECEIVER BD 04935 60004 AND A13 RECEIVER WITH P AR 04935 60006 REVC SERIES 22474 m
141. set the AC Calibrator output to 7 702 mV 40 05 dBm into 600 ohms 2 The 4935A level display should be within the limits shown in Table 4 4 Model 4935A PERFORMANCE TESTS Table 4 4 Receiver Accuracy Test Table FREQUENCY MONITOR AT COUNTER 20 Hz 50 Hz 200 Hz 500 Hz 1000 Hz 5000 Hz 15000 Hz 30000 Hz 50000 Hz 85000 Hz 110000 Hz 10 8 to 10 8 to 105to 105to 10 5 to 10 0 to 11 9 105 to 11 4 10 8 to 11 1 10 8 to 11 1 10 9 to 110 9010129 41 0 40 5 402 402 402 402 402 405 40 5 40 5 111 111 114 114 11 4 ABBREVIATED RECEIVER ACCURACY TEST to 39 1 to 39 6 to 39 9 to 39 9 to 39 9 to 39 9 to 39 9 to 39 6 to 39 6 to 39 6 42 0 t0 38 1 1 Use test setup shown in Figure 4 3 2 Set the AC Calibrator to 7791 V 0 05 dBm into 600 ohms 23 Test the 4935A at each frequency given in Table 4 5 Table 4 5 Abbreviated Receiver Accuracy Test Table FREQUENCY 20 Hz 50 Hz 200 Hz 15 kHz 85 kHz 110 kHz LEVEL 0 7791 V 10 to 0 9 dBm 0 5 04 dBm 0 2 to 0 1 dBm 0 2 to 0 1 dBm 0 5 to 0 5dBm 2 0 to 19 dBm FREQUENCY TOLERANCE Performance Tests FREQUENCY TOLERENCE For instruments with serial prefix 2207A and below refer to Section VII Manual Changes backdating information 4 9 Performance Model 4935A PERFORMANCE TESTS 4 16 Autorange Test SETUP AC CALIBRATOR MODEL 4935A Fig
142. wwwaaa ee lt I ewe a w r ee a 1 070 RIS vrl prs ap 16 EAR Fig 77 5 UiT 0r T4 ar L _ _ ES MCN 06 96 yT DOR a Os _ T 05 05 EE ES Fg i 04 Q4 Cm COLE ee RENE MEL VDO hel 6 1 t v I I tisy cis i e 2 11 l FROM 19 qs i 48 3 1 PIN 6 ape 3 T Ju Al ape B NOTE 5 t I I 0 1 L J 4V v 5 ANALOG SWITCHES ARE DRAWN AS THES BE WITH A LOGIC ON THE CONTROL O I dde c RE Em an 522 s CU ES p L eee ___ _ _ uL REED po 7702 03 704 05 i 8 4 i BUS CEP 1 ae RT P NIGERIA E ___ mI e TA E 19v ARRS o 10 ts e 2 1 v R34 e j ov 4 n V ad 7 vt R40 ca 10K R7 CRIB 750 RN h E gt 54 T S C44 3 Ua M 10 A56 P RER RTI jc 21 6K 19 6K Iv 14 4 R 201 51 1 14V AA R202 00 TP22 14 R205 R23 AVE 5 383k
143. 0 78 6 to 70 0 4 5 Performance Tests 4 6 Vout in mV 750 754 758 762 766 770 774 778 782 78 6 720 794 798 802 806 810 814 818 82 2 02 0 830 834 83 8 84 2 R46 85 0 85 4 85 8 86 2 86 6 87 0 874 878 88 2 88 6 89 0 89 4 89 8 90 2 90 6 91 0 FACTOR 1 0 dB 20 Hz 84 2 to 84 6 to 850 to 85 5 to 85 9 to 86 4 to 86 8 to 87 3 87 7 to 88 2 9 2 to 93 93 94 94 94 954 to 95 8 to 96 3 96 7 to 97 2 97 98 98 99 99 O UF o 99 9 to 100 3 to 66 8 672 67 6 67 68 9 3 Wo 701 70 70 711 71 71 72 72 72 73 73 74 74 74 75 75 75 76 76 76 77 77 71 78 78 79 79 79 Wo 1008 to800 101 2 10804 101 7 to 80 7 102 1 to 81 1 1 12202 to 89125 PERFORMANCE TESTS Table 4 2 Transmitter Flatness at 40 dBm Cont d 0 5 dB 50 Hz 79 4 to 70 8 79 9 to 71 2 80 3 to 71 6 807 1071 9 81 1 to 72 3 81 82 82 82 83 72 7 73 1 73 4 73 8 74 2 83 84 84 85 85 74 6 to 75 0 75 3 to 75 7 to 76 1 cr o 86 86 2 76 86 6 to 77 87 to 77 87 to to 76 87 9 to 4 9 81 1 88 3 to 78 7 85 3 to 815 88 8 to 79 1 85 8 to 81 9 89 2 to 79 5 86 2 to 82 3
144. 0160 6623 0160 7101 0160 6595 0160 6623 150D106X9020B2 0160 6539 0160 6539 0160 6623 0160 7099 0160 5877 0180 6623 0180 6623 0160 7099 0160 5877 0160 6623 0160 6623 0160 7100 0160 6623 0160 6623 0160 5863 0160 6623 0160 6623 0160 6623 0160 6539 0160 6623 0160 6539 0160 7100 0160 7088 0160 7089 0160 5877 0160 7100 0160 6623 0160 6623 0160 6623 0160 6623 150D106X9020B2 0160 6623 0160 7100 0160 7100 0160 7100 0160 6623 0160 6623 0160 6539 0160 6623 0160 6623 0160 6623 0160 6623 0160 6539 0160 6623 0160 6623 0160 7100 0160 6623 0160 7100 0160 6623 0160 6623 0160 6623 0160 5814 6 27 Replaceable Parts Model 4935A fr Part P Part umber porno signator umber Description 13 156 0160 5811 CAPACITOR FXD 430PF 196 300VDC MICA 0160 5811 1 157 0180 0197 2 3UF 10 20VDC 150D225X8020A2 A13C158 0180 0197 CAPACITOR FXD 2 2UF 1096 20VDC TA 150D225X9020A2 A13C159 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C160 CAPACITOR HAND SELECTED ONLY IF NEEDED A13C201 0160 6623 CAPACITOR FXD 1UF 20 50VDC CER 0160 6623 A13C202 CAPACITOR HAND SELECTED ONLY IF NEEDED
145. 0180 1746 CAPACITOR FXD 15UF 10 20 VDC TA 150D156X9020B2 A13C3 0180 1746 CAPACITOR FXD 15UF 10 20VDC TA 150D156X9020B2 13 4 0180 1746 CAPACITOR FXD 15UF 1096 150D156X9020B2 13 8 0160 6623 CAPACITOR FXD 1UF 20 50VDC CER 0160 6623 13 6 0160 5719 CAPACITOR FXD 620PF 596 300VDC MICA 0160 5719 A13C7 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C8 0160 6623 CAPACITOR FXD 1UF 20 50VDC CER 0160 6623 A13C9 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 CER 0160 6623 0160 6623 0160 6623 0160 6623 A13C10 A13C11 A13C12 0160 6573 CAPACITOR FXD 2000PF 5 300VDC MICA 0160 6573 A13C13 0160 6623 CAPACITOR FXD 1UF 2096 CER 0160 6623 A13C14 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C15 CAPACITOR FXD 1UF 20 50VDC CER 20 CER 0160 6623 0160 6623 A13C16 0160 6623 CAPACITOR FXD 0160 6623 13 17 0160 6623 CAPACITOR FXD 1UF 2096 CER 0160 6623 13 18 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 13 19 0160 6539 CAPACITOR FXD O1UF 1 100VDC MICA 0160 6539 A13C21 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C22 0160 6623 C
146. 0180 8823 30D506G025CC2 0180 2094 0160 6623 0160 6623 0180 7099 0180 7099 0160 6623 0160 6623 0160 6623 0180 6823 0180 0127 0180 3124 1500225 9020 2 150D225X9020A2 0180 8823 01808623 0180 8823 0160 0127 190D106X9020B2 150D156X9020B2 DYS 0160 4833 0160 4835 0180 0291 Model 4935A Beta 4 103 4 104 4 105 4 106 4 107 A4C108 4 1 A4CR1 A4CR4 A4CR6 A4CR7 A4CR9 4 10 4 14 A4CR15 A4CR16 4 17 4 18 4 19 A4CR20 4 23 A4CR24 A4CR25 A4CR26 AACR27 nator 0160 6500 0160 6500 0160 6500 0160 6500 0160 6500 01606500 01606500 0160 6500 0160 6500 01606623 125 1 6047 1902 0041 1901 0033 1901 0731 1902 1399 1901 0731 1901 0731 1901 0731 1901 0731 1901 0731 1901 0033 1901 0033 1902 1389 1884 0250 1902 0052 190 0731 1901 0033 1801 2208 1902 0202 12516947 12516947 12516656 125 l 4573 1251 6947 1251 6947 1258 0141 1251 6947 1258 0141 1251 6947 1258 0141 1251 6947 1258 0141 12516947 1258 0141 081 1 3587 061 1 3667 0811 3587 1254 8847 4 1853 0512 1854 0575 1853 0512 1853 0512 1853 0012 1854 0053 1853 0036 Oe Q WO O OW DOH HOM O O FO Qty Description CAPACITOR FXD 010 10 SOVDC CER CAPACITOR FXD OIUF 10 50VDC CER CAPACITOR
147. 0376 DIODE GEN Add AI3CR25 HP Part No 1901 0376 DIODE GEN Add A13J2 HP Part No 1250 0257 CONNECTOR Add A13J3 HP Part No 1250 0257 CONNECTOR Change A13JU7 to HP Part No 1251 0473 CONNECTOR Page 6 27 Table 6 3 Replacement Parts A13 Receiver Board Change AI3RAS to HP Part No 0698 8638 RESISTOR 3 16K 1 Change 13849 to HP Part No 0698 6445 RESISTOR 6 838 1 Change AI3R62 to HP Part No 0699 0666 RESISTOR 1 705K 1 Change AI3R63 to HP Part No 0690 0666 RESISTOR 1 705K 1 Change AIBR72A to HP Part No 0699 0665 RESISTOR 1 248K 196 Change AU3R73 to HP Part No 0699 0669 RESISTOR 3 288K 1 Change AI3R74 to HP Part No 0699 0669 RESISTOR 3 288K 1 Change AI3R91 to HP Part No 0699 0665 RESISTOR 1 248K 1 Page 6 28 Table 6 3 Replacement Parts 13 Receiver Board Add A13R130 HP Part No 0757 0442 RESISTOR 1 Add A13R176 HP Part No 0698 8638 RESISTOR 8 16K 1 Add 198177 HP Part No 0698 6445 RESISTOR 6 838K 190 Change AI3RI29 to HP Part No 0698 6362 RESISTOR IK 19 Change AI2RI22 to HP Part No 0698 3268 RESISTOR 11 5K 117 Change AI3RIT23 to HP Part No 0757 0419 RESISTOR 681 1 OHM 1 Change AI3R146 to HP Part No 0698 6446 RESISTOR 2 162K 1 Change AI3RIA7 to HP Part No 0698 6445 RESISTOR 6 838K 1 Page 6 29 Table 6 3 Replacement Parts A13 Receiver Board Delete AL2TP21 25 HP Part No 1251 6947 TEST PIN 2 Model 4935A Manual Changes
148. 0490 0569 2N6476 MPS A42 1853 0036 2N3904 1853 0036 1853 0036 1853 0036 2N3904 2N3904 2N3904 2N6474 1853 0036 2N6476 C4 1 8 TO 619R F C4 1 8 TO 1003 F C4 1 8 TO 5112 F C4 1 8 TO 1002 F C4 1 8 TO 1001 F C4 1 8 TO 1002 F C4 1 8 TO 1003 F 0699 0653 4 1 8 1002 0699 0501 0698 6358 6 23 Replaceable Parts Model 4935A eference P Part ASR14 0699 0653 0 RESISTOR 121 78 1 125W TC 0 25 0699 0653 5 16 0699 0653 0 RESISTOR 121 78 1 125W F 0 25 0699 0653 5 17 0699 0591 5 RESISTOR 140 158K 1 125W F 0 25 0699 0591 5 19 0757 0442 9 RESISTOR 10K 1 125W TC 0 100 C4 1 8 TO 1002 F ASR20 0811 1676 4 RESISTOR 6 8 1 5W TC 100 0811 1676 5 21 0698 3409 8 RESISTOR 2 37 1 SW TC 0 100 0698 3409 5 22 0757 0280 3 RESISTOR 1K 1 125 F TC 0 100 C4 1 8 TO 1001 F A5R23 0698 3407 8 RESISTOR 1 96K 1 5W TC 0 100 0698 3407 ASR24 0698 3409 8 RESISTOR 2 37K 196 5W TC 0 100 0698 3409 A5R25 0698 3150 6 RESISTOR 2 37K 1 125W TC 0 100 C4 1 8 TO 2371 F A5R27 0698 6360 6 RESISTOR 10K 1 125W F TC 0 25 0698 6360 A5R28 0698 6360 6 RESISTOR 10K 1 125W F TC 0 25 0698 6360 5829 0757 0442 9 RESISTOR 10K 1 125W TC 04 100 C4 1 8 TO 1002 F A5R30 0698 0083 8 RESISTOR 1 96 1 125W TC 0
149. 0698 3160 0698 3160 0757 0442 0698 3160 0757 0421 0757 0442 0757 0443 0757 0441 0757 0419 0757 0422 0757 0442 2100 3881 0757 0279 2100 3882 C ROO ADADO NGAA O ID Quouoo BDAONOD DUU Description TRANSISTOR PNP PD 50W FT 20MHZ TRANSISTOR PNP PD 50W FT 20MHZ TRANSISTOR PNP SI 39 PD TRANSISTOR NPN SI TO 5 PD 800MW TRANSISTOR PNP Si PD 310MW FT 250MHZ RESISTOR 100K 1 125W F TC 0 100 RESISTOR 10K 1 125W 0 25 RESISTOR 909 1 5W F TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 1M 1 125W F TC 0 100 RESISTOR 825K 196 125W F TC 0 100 RESISTOR 825K 196 125W TC 0 100 RESISTOR 1M 1 125W TC 0 100 RESISTOR 1M 1 125W F TC 0 100 RESISTOR 825K 1 125W TC 0 100 RESISTOR 562K 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 100K 1 125W F TC 0 100 RESISTOR 10K 1 125W TC 0 25 RESISTOR 196 1 125W F TC 0 100 RESISTOR 100K 1 125W F TC 0 100 RESISTOR 1K 1 125W F TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 10K 1 125W F TC 0 100 RESISTOR 9 09 1 125W TC 0 100 RESISTOR 750 1 125W TC 0 100 RESISTOR 750 1 125W F TC 0 100 RESISTOR 1 96 1 125W TC 0 100 RESISTOR 100K 1 125W F TC 0 100 NETWORK RES 8 SIP 22 0K X
150. 1 125W 0 25 0698 6360 A3R62 0757 0317 2 RESISTOR 1 33K 1 125W 24546 1 8 0 131 A3R63 0757 0317 RESISTOR 1 33K 1 125W 24546 1 8 0 131 A3R64 0757 0442 RESISTOR 10K 1 125W TC 0 100 4 1 8 0 1002 A3R65 2100 3882 RESISTOR TRMR 2K 10 C TOP ADJ 17 TRM 2100 3882 A3R66 0757 0442 RESISTOR 10K 1 125W 0 100 4 1 8 0 1002 A3R67 0698 3157 2 RESISTOR 10 6 1 125W 0 100 4 1 8 10 1962 A3R68 0757 0444 1 RESISTOR 12 1K 1 125W 0 100 4 1 8 0 1212 69 0757 0199 RESISTER 21 5K 125W 0 100 A3R70 0757 0420 RESISTOR 750 1 125W TC 0 100 A3R71 0698 3157 RESISTOR 19 6 1 125W F TC 0 100 A3R72 0757 0420 RESISTOR 750 1 125W F TC 0 100 A3R72A 0757 0280 RESISTOR 1K 1 125W 0 100 A3R73 0698 3150 RESISTOR 2 37K 1 125W CA 1 8 T0 2371 F A3R74 0698 3150 RESISTOR 2 37 190 125W CA 1 8 T0 2371 F A3R75 0757 0274 1 RESISTOR 1 21K 1 125W 0 100 4 1 8 0 1211 A3R76 0698 0084 RESISTOR 2 15K 1 125W 0 100 C4 1 8 T0 2151 F A3R77 2100 3881 2 RESISTOR TRMR 500 10 TOP ADJ 17 TRN 2100 3881 A3R78 0757 0465 2 RESISTOR 100K 1 125W F TC 0 100 4 1 8 0 1003 79 0698 4530 1 RESISTOR 232K 1 125W 0 100 C4 1 8 T0 2323 F A3RB0 0699 0595 1 RESISTOR 365K 1 125W 0 25 0699 0595 A3RB1 0699 1078 1 RESISTOR 134K 1 125W TC 0 100 0699 1078 A 3R82 0698 4516 1 RESISTOR 113K 1 125W TC 0 100 4 1 8 0 1133
151. 1 125W TC 04 100 RESISTOR 51 1K 1 125W F TC 04 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 204 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 31 6K 196 125W TC 04 100 RESISTOR 1K 196 125W TC 0 100 C4 1 8 TO 1001 F RESISTOR 51 1K 1 125W TC 0 100 C4 1 8 TO 5112 F RESISTOR 133K 1 125W TC 04 100 1 8 TO F RESISTOR 10K 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 825 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 11K 1 125W TC 0 100 RESISTOR 8 25K 1 125W TC 0 100 RESISTOR681 1 125W TC 0 100 4 1 8 T0 681R F RESISTOR 909 1 125W TC 0 100 1 8 TO 1002 F RESISTOR 10K 1 125 TC 04 100 C4 1 8 TO 1002 F RESISTOR TRMR 500 1096 C TOP ADJ 17 TRN 2100 3881 RESISTOR 3 16K 1 125W TC 0 100 OA HS TONGE RESISTOR 2K 1096 TOP ADJ17 TRN 21 W 3882 RESISTOR 10K 1 125W TC 0 100 4 1 8 0 1002 4 1 8 0 1002 RESISTOR 10K 196 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 4 1 8 0 1002 RESISTOR 31 6 1 125W TC 0 100 0757 0180 C4 1 8 T0 1002 F 50338 C4 1 8 TO 1331 F 4 1 8 0 751 4 1 8 0 751 0787 0420 0757 04 0757 046 0757 0438 0757 0438 0757 0442 0757 0458 0698 3156 0698 3 152 0757 0458 0757 0442 0698 3160 0
152. 1 125W TC 0 100 RESISTOR 4 64K 1 125W TC 0 100 RESISTOR 21 5K 1 125W F TC 0 100 RESISTOR 10K 1 125W TC 0 25 RESISTOR 1 33K 1 125W RESISTOR 1 33 1 125W RESISTOR 10K 1 125W TC 0 100 RESISTOR TRMR 2K 10 C TOP ADJ 17 TRN RESISTOR 10K 1 125 F TC 0 100 RESISTOR 19 6K 1 125W F TC 0 100 RESISTOR 12 1K 1 125W TC 0 100 RESISTOR 21 5K 1 125W F TC 0 100 RESISTOR 750 1 125W F TC 0 100 RESISTOR 19 6 1 125W F TC 0 100 RESISTOR 750 1 125W TC 0 100 RESISTOR 1K 1 125W TC 0 100 RESISTOR 2 37K 1 1252 RESISTOR 2 37K 1 125W RESISTOR 1 21K 1 125W TC 04 100 RESISTOR 2 15K 1 125W TC 0 100 RESISTOR TRMR 500 10 TOP ADJ 17 TRN RESISTOR 100K 1 125W TC 0 100 RESISTOR 232K 1 125W F TC 0 100 Replaceable Parts fr Part umber CR 1 8 TO 511R F C4 1 8 TO 511R F C4 1 8 TO 511R F 2100 3883 C4 1 8 TO 1002 F CR 1 8 TO 751 F C4 1 8 TO 1582 F C4 1 8 TO 1582 F C4 1 8 TO 1101 F C4 1 8 TO 2371 F CR 1 8 TO 1002 F C4 1 8 TO 1002 F C4 1 8 TO 1002 F CR 1 8 TO 1582 F C4 1 8 TO 1582 F C4 1 8 TO 4641 F 55 1 8 9761 MF4C1 8 T9 11R B 0698 8360 CA 1 80 TO 2371 F C4 1 8 TO 1963 F CR 1 8 TO 101 F C4 1 8 TO 5111 F C4 1 8 TO 4641 F C4 1 8 TO 2152 F 0698 6360 C4 1
153. 1 125W TC 0 100 24546 C4 1 8 T0 1002 F A14R87 0698 4437 RESISTOR 2 94K 1 125W 0 100 24546 4 1 8 0 2941 14888 0698 6360 RESISTOR 10K 1 125W 0 25 28480 0698 6360 A14R89 0698 6360 RESISTOR 10K 1 125W 0 25 28480 0698 6360 A14R90 0757 0442 RESISTOR 10K 1 125W TC 0 100 24546 4 1 8 10 1002 14891 0757 0289 RESISTOR 13 3K 1 125 F 0 100 19701 4 1 8 10 1332 A14R92 0757 0279 RESISTOR 3 16K 1 125W TC 0 100 24546 C4 1 8 T0 3161 F A14R93 0698 8827 RESISTOR 1M 1 125W 0 100 28480 0698 8827 Table 6 3 Replaceable Parts Continued Manual Changes See introduction to this section for ordering information Indicates factory selected value 7 69 Manual Changes Model 4935A Table 6 3 Replaceable Parts Continued HP Part C Number D Description Mfr Part Number Reference Designator A14R94 0757 0442 RESISTOR 10K 1 125 0 100 24546 4 1 8 0 1002 14 95 0 57 0394 RESISTOR 51 1 1 125W 0 100 02995 5033R 14 696 0757 0442 RESISTOR 10K 1 125W
154. 1 125W RESISTOR 19 6K 1 125W RESISTOR 1 62 125W Scc introduction to this section for ordering information Indicates factory sclected value Manual Changes Mfr Part Number MF4C1 8 T0 9091 F 4 1 8 0 751 C4 1 8 T0 751 F 4 1 8 0 1961 C4 1 8T0 1003 F 20BA223 4 1 8 0 1003 2100 3882 C4 1 8 T0 511R F 4 1 8 1961 4 1 8 0 1002 5033R C4 1 8 T0 1331 F 4 1 9 0 751 4 1 8 0 751 4 1 8 0 10 C4 1 8 T0 10 2100 3881 4 1 8 0 5111 4 1 8 0 5111 4 1 8 70 1002 C4 1 8 T0 5112 F CA 1 8 T0 1472 F 4 1 8 0 3481 4 1 8 70 5112 C4 1 8 T0 3162 F C4 1 8 T0 1002 F 4 1 8 0 3162 C4 1 8 T0 B25R F 4 1 8 0 1002 2100 3881 4 1 8 0 3161 2100 3882 4 1 8 0 1002 4 1 8 0 1002 4 1 8 0 1002 0757 0180 075 0180 MFAC 1 MFAC 1 C4 1 8 TO 2151 F 5033R 3 4 1 8 10 3161 0698 8827 4 1 8 10 1002 C4 1 8 T0 51R1 F C4 1 8 TO 1002 F 1 9937 993 MFAC 1 Manual Changes Model 4935A Table 6 3 Replaceable Parts Continued 7 56 Scc introduction to this section for ordering information Indicates factory sclected value Reference HP Part Mfr Part Designator Number Description Number 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 28480 1251
155. 1 8 TO 101 F A2R60 0757 0401 RESISTOR 100 1 125W TC 0 100 4 1 8 0 101 2871 0698 8827 RESOSTOR 1M 1 125W 0 100 0698 8827 A2R72 0757 0199 RESISTOR 21 5K 1 125W TC 0 100 4 1 8 0 2152 A2R73 2100 3164 RESISTOR TRMR 10 20 C SIDE ADJ 17 TRN 4P100 A2R74 0698 3429 RESISTOR 19 6 1 125W 0 100 PME55 1 8 T0 19R6 F A2R76 0757 0401 RESISTOR 100 1 125W TC 04 100 A2R77 0757 0401 RESISTOR 100 1 125W F TC 0 100 A2R78 0757 0401 RESISTOR 100 196 125W 0 100 A2R80 0757 0401 RESISTOR 100 1 125W 0 100 251 3101 2124 1 SWITCH PB ALTNG 25A 115VAC 3101 2124 252 3101 2391 1 SWITCH PB 2 STATION 15 C C SPACING 3101 2391 253 3101 2391 SWITCH PB 2 STATION 15MM SPACING 3101 2391 254 3101 0499 2 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 255 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 A256 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 257 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 258 3101 0499 SWITCH PB 5 STATION 10MM SPACING 3101 0499 259 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 2510 3101 0499 SWITCH PB 5 STATION 10 SPACING 3101 0499 2511 3101 0499 SWITCH PB 5 STATION 10MM SPACING 3101 0499 A2S12 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3104 0499 2513 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 A2SG1 1970 0078 2 TUBE ELECTRON SURGE V PICTR B1 A350 15 2562 1970 0078
156. 1 RESISTOR 10 7K 1 125W TC 0 50 MF4C1 8 T2 1072 B A3R144 0698 8068 5 1 RESISTOR 4 99 25 125W 0 25 MF401 8 19 4991 C A3R145 0699 0597 1 3 RESISTOR 2 26 1 125W 0 25 0699 0597 _ A3R146 0698 6447 0 1 RESISTOR 683 8 1 125W TC 0 25 0698 6447 147 0698 6446 9 1 RESISTOR 2 162K 1 125M 0 25 0698 6446 A3R14B 0699 0592 6 1 RESISTOR 7 741K 196 125W 0 25 0699 0592 A3R149 0698 6360 6 RESISTOR 10K 1 125W TC 04 25 0698 6360 A3R150 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A3R151 0699 0590 4 RESISTOR 15 758K 1 125W 0 25 0699 0590 A3R158 0699 0597 1 RESISTOR 2 26K 1 125W F TC 0 25 0699 0597 A3R159 0699 0597 1 RESISTOR 2 26 1 125W 0 25 0699 0597 A3R160 0698 6360 6 RESISTOR 10K 1 125W F TC 0 25 0698 6360 161 0698 6360 6 RESISTOR 10K 1 125 0 25 0698 6360 162 0698 8799 9 1 RESISTOR 21 5K 1 125W 0 25 0698 8799 A3R163 0699 0593 7 2 RESISTOR 13 665K 1 125W 0 25 0699 0593 164 0699 0593 7 2 RESISTOR 13 665 1 125W 0 25 0699 0593 A3R165 0699 0600 7 1 RESISTOR 108 502K 1 125W 0 25 0699 0600 166 0699 0591 5 1 RESISTOR 140 158 1 125W F 0 25 0699 0591 A3R167 0757 0443 0 1 RESISTOR 11K 1 125W 0 100 C4 1 8 T0 1102 F A3R178 0698 7847 6 RESISTOR 1 111K 1 125W TC 0 25 A3R179 0698 6360 6 RESISTOR 10K 1 125W F TC 0 25 0698 A3R180 2100 3883
157. 10 20VDC TA CAPACITOR FXD 15UF 10 20VDC la CAPACITOR FXD 15UF 10 20V CAPACITOR FXD 1 UF 2096 50V CAPACITOR FXD 620PF 5 30VDC MICA CAPACITOR FXD 20 CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF t 20 CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 2000PF 5 300VDC MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1 UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 4 UF 20 SOVDC CER CAPACITOR FXD 01UF 4 196 100VDC MICA CAPACITOR FXD 1UF 10 SOVDC CER CAPACITOR FXD 1UF 10 SOVDC CER CAPACITOR FXD IUF 10 CER CAPACITOR FXD 39PF_ 5 300VDC CAPACITOR 1UF 20 SOVDC CER CAPACITOR IUF 20 50OVDC CER CAPACITOR FXD O1UF 1 1 100VCD MICA CAPACITOR FXD 10UF 10 20VDC TA CAPACITOA FXD 10UF lIO TA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 5OVDC CER CAPACITOR FXD 1UF 20 SOVDC CER CAPACITOR FXD 10UF 1096 20VDC TA CAPACITOR EXD 10UF 10 20VDCTA CAPACITOR FXD 10UF 1096 20VDC CER CAPACITOR FXD 1 UF 20 CER CAPACITOR FXD 39PF 5 300 VDC MICA CAPACITOR FXD 082UF 10 200VDC POLYE CAPACITOR FXD 8 1 20 SOVDC CE200VCD POLYE 28480 28480 CAPACITOR FXD 1UF 20 5OVDC CER 28480 CAPACITOR F
158. 100 C4 1 8 TO 1961 F 5 1 0757 0465 6 RESISTOR 100K 1 125W F TC 0 100 C4 1 8 TO 1003 F A5R32 0757 0418 8 RESISTOR 619 1 125W F TC 0 100 C4 1 8 TO 619R F A5R33 0811 1676 4 RESISTOR 8 8 1 5W TC 100 0811 1676 AS5R34 0811 1672 6 RESISTOR 3 3 5 2W PW TC 0 400 BWH2 3R9 J ASR35 0698 3407 8 RESISTOR 1 96K 1 5W TC 0 100 0698 3407 A5R36 0698 3404 3 RESISTOR 383 1 5W TC 0 100 0698 3404 A5R37 0757 0280 3 RESISTOR 1K 1 125W F TC 0 100 C4 1 8 TO 1001 F A5R38 0698 6360 6 RESISTOR 10K 1 125W TC 0 25 0698 6360 A5R39 0698 6360 6 RESISTOR 10K 1 125W TC 0 25 0698 6360 ASR40 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 C4 1 8 TO 1001F A5R41 0757 0814 3 RESISTOR 511 196 125W F TC 0 100 0757 0814 ASTP1 0360 0124 3 CONNECTOR SGL CONT P 04 IN BSC SZ 0360 0124 A5TP2 0360 0124 3 CONNECTOR SGL CONT P 04 IN BSC SZ RND 0360 0124 ASU1 1826 0138 8 IC COMPARATOR GP QUAD 14 DIP P PKG LM339N 502 1826 0712 4 IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P LF353N A5 MISCELLANEOUS PARTS 0490 0570 SOCKET RLY 6 CONT CRADLE PC 0490 0570 1205 0309 HEAT SINK 01 015 1205 0309 1205 0512 HEAT SINK SGL TO 220 CS 1205 0512 1251 6859 CONNECTOR 18 PIN POST TYPE 1251 6859 8120 3181 CABLE ASSY FLEX COND 8120 3181 Hense See introduction to this section for ordering information Indicates factory sclected value 6 24 Model 4935A 076066 signator A6LF A6T1 P
159. 100 C4 1 8 TO 1001 F C4 1 8 TO 1003 F 4 1 8 0 101 2100 3882 0698 6467 RESISTOR 100K 196 125W TC 0 100 RESISTOR 100 1 125W TC 0 100 RESISTOR TRMR 2K 10 C TOP ADJ 17 TRN RESISTOR 16 9K 1 125W F TC 0 50 A13R184 0757 0465 0757 0401 2100 3882 0698 6467 A13H185 A13R186 A13R187 AWLOD DONAN 440 MMH ANNA See introduction to this section for ordering information ndicates factory selected value 4935 Replaceable Parts fr Part P Part AM umber Description signator A13R201 0757 0458 7 RESISTOR 51 1K 1 125W F TC 0 100 4 1 8 T0 5112 F A13R202 0757 0401 0 RESISTOR 100 1 125W F 0 100 C4 1 8 TO 101 F A13R203 0757 0458 7 RESISTOR 51 1K 1 125W TC 0 100 C4 1 8 TO 5112 F A13R204 0757 0401 0 RESISTOR 100 1 125W TC 0 100 4 1 8 0 101 A13R205 0698 4002 1 RESISTOR 5K 1 125 TC 0 100 4 1 8 0 5001 A13R206 1810 0369 NETWORK RES 6 SIP OHM X5 750 61 R100K A13R207 0698 6445 RESISOR 6 838K 1 125W F TC 0 25 0698 6445 A13R208 0811 3587 WIRE 1 2 IN RESISTOR 0 OHMS 104 138209 0757 0438 RESISTOR 5 11K 196 125W F TC 0 100 C4 1 8 TO 5111 F A13R210 0698 0085 RESISTOR 2 61K 196 125W F 0 100 0698 0085 9100 3489 TR
160. 100 MF4C1 8 TO 1742 C A13R106 0698 8858 I RESISTOR 12 4K 196 125W F TC 0 25 0698 8858 138107 0698 8858 1 RESISTOR 12 4K 1 125W 0 25 0698 8858 A13H108 0698 7929 5 RESISTOR 9 09 1 125W TC 0 50 MF4C1 8 T2 9091 B A13R109 0598 7929 5 RESISTOR 9 09K 1 125W 0 50 MF4C1 8 T2 9091 B A13R110 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A13R111 0598 6467 4 RESISTOR 16 9K 1 125W 0 50 0698 6467 A13R112 0699 0566 4 RESISTOR 15 5K 1 125W F TC 0 25 0699 0566 A13H113 0699 0566 4 RESISTOR 25 5K 1 125W 0 25 0699 0566 A13R114 0598 6445 RESISTOR 6 838 1 125W 0 25 0698 6445 A13R115 0598 8638 5 RESISTOR 3 16K 1 125W 0 25 0698 8638 A13R116 0757 0289 2 RESISTOR 13 3 1 125W 0 100 138 117 0699 0589 1 RESISTOR 34 334K 1 125W TC 0 25 0699 0589 A13R118 0699 0589 1 RESISTOR 34 334K 1 125W 0 25 0699 0589 119 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A13R120 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A13R121 0699 0588 0 RESISTOR 18 171K 1 125W 0 25 0699 0588 138122 0698 8858 5 RESISTOR 12 4K 1 125W TC 0 25 0698 8858 138123 0699 0164 8 RESISTOR 738 5 1 125W 0 25 NESS At3R124 0757 0290 5 RESISTOR 6 19K 1 125W 0 100 MF4C1 8 T0 6191 F A13R125 0757 0290 S RESISTOR 6 19K 1 125W 0 100 1 8 0 6191 A13R126 0698 6423 2 RESISTOR 31 25 1 125W
161. 125W TC 0 100 24546 C4 1 8 T0 825R F 14866 0757 0442 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 14867 0757 0443 RESISTOR 11K 1 125W F TC 0 100 24546 4 1 8 0 1102 A14R68 0757 0441 RESISTOR 8 25 1 125W 0 100 24546 4 1 8 0 8251 A14R69 0757 0419 RESISTOR 681 1 125W TC 0 100 03293 C4 1 8 T0 681R F A14R70 0757 0442 RESISTOR 10K 1 125W F TC 0 100 24546 4 1 8 0 1002 14871 0757 0442 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 14872 2100 3881 RESISTOR TRMR 500 10 TOP ADJ 17 TRN 28480 2100 3881 14873 0757 0279 RESISTOR 3 18K 1 125W 0 100 24546 4 1 8 70 3161 14874 2100 3882 RESISTOR TRMR 2K 10 TOP ADJ 17 TRN 28480 2100 3882 A14R75 0757 0442 RESISTOR 10K 1 125W F TC 0 100 24546 C4 1 8 T0 1002 F A14R76 0757 0442 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 14877 0757 0442 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 A14R78 0757 0180 RESISTOR 31 6 1 125W F TC 0 100 28480 0757 0180 A14R79 0757 0180 RESISTOR 31 6 1 125W 0 100 28480 0757 0180 A14RBO 0757 0428 RESISTOR 1 62K 1 125W 02995 1 14881 0757 0431 RESISTOR 2 43K 1 125W 02995 4 1 A14R82 0699 0084 RESISTOR 2 15K 1 125W 0 100 24546 C4 1 8 T0 2151 F A14R83 0698 6393 RESISTOR 585 1 125W 0 25 02995 5033R 14885 0699 0763 RESISTOR 10 6K 1 125W TC 0 100 28480 0699 0763 14886 0757 0442 RESISTOR 10K
162. 14 12111 C14 41 vsej 1 Jue 16 e 77 5 2 gt 4 14 c64 017 M 0 1 2 65 14v NOISE FILTER INPL x 222 wl hee Gees vee R122 12 4K R123 30 738 5 1010 BANDPASS FILTER 3 1 14V 2 3 27 2 237 R44 C26 12 0 01 15 8 15 8 5 p8 T 0 1 4 R36 R45 b 7 T 15 BK 15 8K 6 M 4 C25 Bi 0 1 14 ee eee ee ee 520 demo feet ee d rege ee cM Ml ee fore R102 R132 5000 FZ 1010 R116 5000 13 3K Q 995 Hz Q 1010 Hz 34 334 140 158K C101 0 01 C100 C141 0 01 2 R124 R137 K 18 171K 15 758 URE d R118 10 R165 34 334K 108 502k R100 R151 18 171K 15 758K ECT NC NC 12 11 10 16 we TPCT NC NC NC NC Ex ee n r TIn 55757 72 72052 054 144 0 1 14V INPUT n AA R166 140 15BK 141 0 01 R150 1 10K emi TU R1B0 5000 1025 Hz R149 T iok NOTCH 3 C146 0 01 13 R164 14 13 665 12 V R14B R163 7 741K 13 655 FZ 1025 Service SHT 2
163. 1730 1820 1195 1820 1730 1820 1730 1820 1112 1820 1199 1820 1112 1826 0712 1826 0735 1826 0735 1200 0654 1200 0638 0410 1180 0410 1866 0410 1327 1200 0666 1251 6856 0 2 00M 40 0 CNTR TTL LS 12 ASYNC CNTR TTL LS BIN ASYNC 10 BIT D A CONVERTER TTL 4 FULL ADDER TTL 4 BIT FULL ADDER TTL 4 BIT FULL ADDER TTL 4 BIT FULL ADDER TTL 4 BIT FULL ADDER QUAD NAND GATE CMOS 2 INPUT DUAL 4 CHANNEL MULTIPLEXER OP AMP H SLEW RATE OP AMP NMOS 3276B 32K ROM 450 NS 3 S FF TTL LS D TYPE POS EDGE TRIG FF TTL LS POS EDGE TRIG FF TTL LS D TYPE POS EDGE TRIG FF TTL LS D TYPE POS EDGE TRIG FF TTL LS D TYPE POS EDGE TRIG INV TTL LS HEX 1 INPUT FF TTL LS D TYPE POS EDGE TRIG OP AMP LOW BIAS H IMPD OP AMP H SLEW RATE OP AMP H SLEW RATE SOCKET IC 40 CONT 14 PIN CRYSTAL 4 000 MHZ CRYSTAL 4 194304 MHZ CRYSTAL 6 144 MHZ A14 MISCELLANEOUS PARTS TRANSISTOR SOCKET 3 CONT CONNECTOR 18 PIN M POST TYPE See introduction to this section for ordering information Indicates factory selected value SN74LS82N SN74LS93N AD561J0 SN74LS283N SN74LS283N SN74LS283N SN74LS283N SN74LS283N SN74LSOON AD7502JN HA3 2507 5 1826 1071 SYP2332 MASKED SN74LS273N SN74LS175N SN74LS273N SN74LS273N SN74LS74AN SN74LSO4N SN74LS74AN LF353N HA3 2507 5 HA3 2507 5 1200 065
164. 1901 0050 1250 0257 1251 6947 CONNECTOR RF SMB M 50 OHM CONNECTOR SGL CNT PIN 025 IN BSC SZSQ A13J1 A13J4 1250 0257 1251 6947 A13JU1 1200 0607 SOCKET IC 16 CONT DIP IP SLDR 1200 0607 A13JU1 1251 4398 SHUNT 4 POSITION 1251 4398 A13JU2 1200 0607 SOCKET IC 16 CONT DIP DIP SLDR 1200 0607 A13JU3 1200 0607 SOCKET IC 16 CONT DIP DIP SLDR 1200 0607 A13JU4 1200 0607 SOCKET IC 16 CONT DIP SLDR 1200 0607 A13JU5 1200 0607 SOCKET IC 16 CONT DIP DIP SLDR 1200 0607 A13JU5 1251 4398 SHUNT 4 POSITION 1251 4398 A13JU6 1258 0141 JUMPER REMOVABLE FOR 025 IN SQ PINS 1258 0141 A13JU6 1251 6947 CONNECTOR SGL CONT PIN 025 IN BSC SZ 1251 6947 1258 0141 1251 6947 JUMPER REMOVABLE FOR 025 IN SQ PINS CONNECTOR SGL CONT 025 IN BSC 52 RESISTOR 0 OHMS RESISTOR 10K 1 125W TC 0 100 A13JU7 A13JU7 13 2 A13R1 1258 0141 1251 6947 104 C4 1 8 TO 1002 F 0811 3587 0757 0442 A13R2 0757 0442 RESISTOR 10K 1 125W 0 100 C4 1 8 TO 1002 F A13R3 0698 4465 RESISTOR 931 1 125W F TC 0 100 C4 1 8 TO 931R F A13R4 0698 6393 RESISTOR 585 1 125W F TC 0 25 0698 6393 RESISTOR 1K 196 125W TC 0 100 RESISTOR 6 19 1 C4 1 8 TO 1001 F 4 1 8 TO 6191 F A13R5 A13R6 0757 0280 0757 0290
165. 1901 0731 DIODE GEN PHP 180V 200MA DO 7 1901 0033 DIODE GEN PRP 180V 200MA DO 7 1901 0033 DIODE ZNR 18 0V 2 PD 4W INS248 THYRISTOR TRIAC TO 220AB T2500B DIODE ZNR 6 81V 2 PD 4W 5230016 1135 DIODE PWR RECT 400V 1A 1901 0731 DIODE GEN PRP 180V 200MA DO 7 DIODE GEN PRP 180V 200MA DO 7 DIODE ZNR 15V 5 00 15 PD 1W TC 4 05796 DIODE ZNR 15V 5 00 15 PD 1W TC 4 05796 CONNECTOR SGL CONT 025IN BSC SZSQ CONNECTOR SGL CONT P 025IN BSC SZSQ CONNECTOR SGL CONT P 025lN BSC SZSQ CONNECTOR PC EDGE 25 CONT ROW 2 ROWS CONNECTOR SGL CONT P 025IN BSC SZSQ 1901 0033 1901 0033 1902 0202 1902 0202 1251 6947 1251 6947 1251 6856 1251 4573 1251 6947 CONNECTOR SGL CONT P 025IN BSC SZSQ 1251 8947 JUMPER REMOVABLE FOR 025 SQ PINS 1258 0141 CONNECTOR SGL CONT P 025 BSC SZSQ 1251 6947 JUMPER REMOVABLE FOR 025 IN SQ PINS CONNECTOR SGL CONT P 025 5 5250 1251 0141 1251 6947 JUMPER REMOVABLE FOR 025 IN SQ PINS 1251 0141 CONNECTOR SGL CONT P 025IN BSC SZSQ 1251 6947 JUMPER REMOVABLE FOR 025 IN SQ PINS 1251 0141 CONNECTOR SGL CONT P 025IN BSC SZSQ 1251 8947 JUMPER REMOVABLE FOR 025 IN SQ PINS 1251 0141 RESISTOR 0 OHMS RESISTOR 0 OHMS 104 104 CONNECTOR SGL CONT PIN 025 5 525 TRANSISTOR PNP PD 50W FT 20MHZ TRANSISTOR NPN PD 625MW FT 50MHZ 1251 694
166. 2 pue py e 2012207 PLY 82 7 m 291 3 7 78 8622 2 38 20209 5 amp 5 0 im jM I es 82 9 68 Lyd il 58 849 9 sa 6 3 2 be kA 6 2 20 it t 3 222 lt 9i z 4 83 120 1 043 La 692 62 892 8 H bil 62 5 4 132 8H 592 991 28 792 4 ail Sal 9172 6 92 L wm Mud s lo Ter ur de 2 dua qu t e vat j 5 68 SSO q lal 91 9 780 CH eg ESO 9 g sis ra 252 d 60 uu 1 152 6 2 6 28 55 052 868 59 19 672 079 4 E H 2 8 r9 8 0 i1 MHMHR 964 u 95 nos 5 bb eat bt Ed et 2 9 9 970 EAM 82 vey za SH 69 1 5 9 t B 0 8 5 0 68 69 E 55 raze or 288 iH 5 5 LYO sr 26 oro M or s r 95 9 3 652 B s 645
167. 2 5 i 5 9 amp t ps 6 4 5 t 2 eC al A p v r 5 134 4 v 41 M MEM 9 8 8 ET t r UMP 9 5 n 42219 3 a ds L ela 6s pea 1 z if ac 4 oi aja sia i 7 i ack 5 aad bey H E 2 us gl 2 z 179 ued i i 4 4 R i 4 ai 4 x 2 1 I f a is FA 34 4 2 H Acs 2 kh Shot px t x 12 x 26 2 1 6 D je gt 16 25 e gt L Qj ATE QN xag 2 a 1800 E 4 4 42 i a fala a W 9 9 A 21 4 B E Tel bs L 61 07 2 1 al he 19 22 x to me T i 280 21 5 3 4 1 HE iss 9121 ert V m i 4i PEE 1 10 4 2 1 i 4 M 3 P 1919 9 5j 5 r po 4 po 4 4 a b ns 4 7415 HIR R Ic DUREE OM 2 404 4 z P 2 81135 2 4 PE 203 4 4 4 1 4 4 X 6 22
168. 2 2 a 4 p 3 1 t i 4 Si del g t 4 7 N 81 s 7 2 ev crue 1 5 11 HO anh in me US Sum Dmm DD 4l 5 n NI 0 2 we n i 22 SS UR ARR s m i i i 2 E 15 3 2 puy nt A 4 ef Ft 2 4104 5 L Pe to SU badge Bi See 52 WE IL qo 15 gt t a Yn T ig 1 Moy bal E a NE Y 26 5 9 1 dj asap mas S t oo 2 2 6 i lt 43 Y DET RE4 ws Ja i i 4 6 f IRIE gt TT H J 61 17 5 7 QOO Wage I pital 2 BAY 4 2 lg i 3 i 1 4 1 io AUT 1 9 4 ls E i i 2 80 S i oe TRA ce xd ak e E e FS f END 16 NS 4 levee RYE m fr i 7 255 p H i 1 pa a 42244 GAIN vs o 81 a f i by o 3 5456 8 s e P 12 i QA I A A 5 6 y e h r rr epos 2 ro i 4 4 4 1776 m z t I s cas D m m H A
169. 2242 eto 5 5 m 2 3 9 3 M ANE T xe Oldi 659 r ozio 073 Dag c E ow Sj solu 642 v3 652 222 141 5018 22h 8 112 eco ocu ev 941 CH a 450 TURAE sev nus NE gv 884 92 3112 952 oh t 8v rdi ta Suo SED 8v tei 9048 9 vEO zal 865 49 DO tuo eg 2 0 9 ess 92 29 215 2 8 9025 5 U 8 TD 96H 8 8 9 9 0142 622 i 3415 3115030 L2 902u E d 968 thy 75 6045 azo i Eo i 50 89 64 2 99 8012 ico 6 0 roza 63 2 99 1012 920 T 6 5 6 4 9012 Seo Ld Vi i 6 2 2028 83 iBH SH 66 5012 ipl ee gee a es 43 06H 8 59 012 ezo ae ie ls LN uo PN rd 68H 9 8 r9 2010 8 222 is IUP Og iz ag aE EROS 8 9 9 4 ry 2012 liie on is one t3 od ey cu 01
170. 25 dB amp out Detector selected varies Loop around path input is from power amp output in DISPLAY TRMT Loop around path input is from output in DISPLAY RCV 8 32 FREQUENCY MEASUREMENT 8 33 Two counters are used to measure level and frequency These counters are enabled by Port 5 bit 3 of the microprocessor and count pulses present for each counter To select frequency the microprocessor writes a 1 latch 012 Following the procedure given the timing diagram found in figure 8 4 steps 1 through 11 the microprocessor has enough information to calculate frequency The counters are read by addressing and serially reading successive bits from the two counters Counter no 2 contains the number of 262 kHz clock transitions detected during the gating or Open interval Counter no 1 contains a count of the frequency cycles which occurred during this same interval Frequency is the number of complete cycles in a unit time interval i e 10 cycles in 60 msec would be 10 06 sec 167 Hz The time interval is calculated from the number of counts in counter no 2 by calculating N 262 144 which is the amount of timeit takes to 8 6 Model 4935A Service accumulate counts of 262 144 Hz square wave Let Events be the number of frequency cycles and Counts the number of 262 144 Hz cycles the frequency is calculated by the microprocessor using the formula Frequenc ue Hz Events 262 144 DUBIUS 262 144
171. 4476 7120 1155 7120 2388 1120 4194 7120 5370 7205 0356 8120 1521 8120 3126 5040 4467 5040 4468 5040 4469 5040 4470 5040 4471 5060 7159 04935 00002 04935 90018 04935 90023 04935 00007 04935 60011 0460 0880 0460 1601 1400 1076 1420 0284 1420 0284 1420 0285 2950 0043 3050 1114 1540 0835 See introduction to this section for ordering information Description MISC AND CHASSIS PARTS FUSE 250V 120 VAC OPERATION FUSE 25A 250V 220 VAC OPERATION CABLE REC TRAN INTERCONNECT CABLE SHIELDED CABLE ASSEMBLY COAX INSULATOR XSTR THRM CNDCT KNOB BASE 1 2 JGK 125 IN ID KNOB BASE 1 2 JGK 25 IN ID SPACER SNAP IN FOOT BUMPER JUMPER REM OPT 001 amp 003 CLAMP CABLE OPT 001 amp 003 BINDING POST SGL TUR JGK SCREW MACHINE 4 40 SCREW MACH 4 40 375 IN LNG NUT HEX W LKWR 4 40 094 SCREW MACHINE 6 32 SCREW MACH 6 32 375 IN LNG NUT HEX W LCK WSHR SCREW MACH 8 32 375 IN LNG SCREW MACH 8 32 4 IN LNG NUT HEX DBL CHAM 3 8 32 WASHER FL MTLC NO WASHER FL MTLC 5 16 375 WASHER FL MTLC INO 6 NUT HEX 4 40 CASE TOP HALF CASE BIOTTOM HALF LABEL WARNING PLATE IDENT LABEL CAP COVER LABEL INFO HANDLE SUPPORT ROD CABLE ASSY 18AWG 3 CNDCT JUMPER CABLE ASSY SPACER SHORT PLASTIC SPACER LONG PLASTIC COVER FRONT HANDLE CASE FOOT REAR PWR CORD STRAP ASSY SHIELD ALUM INSTRUCTION SUMMARY CARD OPERATING amp SERVICE MANUAL BATTERY INSULATO
172. 4935A display should stop counting Repeat steps 3 through 6 for each level shown in Source in Volts Table 4 13 Set the LOW SE T threshold to 90 dBrn 0 dBm Press DISPLAY in IMPULSE NOISE to select MID threshold Set the AC Calibrator to 0 820 V the 4935A display should not count Set the AC Calibrator to 0 920 V the 4935A display should count Press DISPLAY in IMPULSE NOISE to select HIGH threshold Set the AC Calibrator to 1 299 V the 4935A display should not count Set the AC Calibrator to 1 457 V the 4935A display should count Model 4935A Performance Tests PERFORMANCE TESTS Table 4 13 Impulse Noise DAC Test AC CALIBRATOR PEAK SIGNAL COUNTING NOT COUNTING VOLTAGE IN dBm THRESHOLD THRESHOLD 0 580 0 5 91 0651 1 3 92 0 730 1 5 93 0 820 3 3 94 0 920 4 5 95 1 032 55 96 1158 65 97 1 299 1 5 98 1 457 85 99 1 635 9 5 100 ABBREVIATED IMPULSE NOISE DAC TEST There is no abbreviated Impulse Noise DAC Test Performance Tests Model 4935A 4 16 4 19 SETUP PERFORMANCE TESTS Count Limit Test AC CALIBRATOR MODEL 4935A Figure 4 7 Count Limit Test EQUIPMENT 10 Fluke 5200A Calibrator banana plug test cable I j IO to banana adapter onnect equipment as shown in Figure 4 7 On 4935A select ON DISPLAY RCV MEASUREMENT IMPULSE NOISE FILTER i kHz FLAT IMPULSE NOISE LOW SET Set AC Calibrator to 2000 Hz
173. 5V 8 Rs OVERVOLTAGE pape l SENSE oes PN CR26 ae Cfi 1G JU i4 522 62 7 2 2 Figure 7 19 A14 Transmitter Board Schematic Diagram partial 7 30 A2 SWITCH BOARD OUTPUT SELECT MUX Figure 7 20 A14 Transmitter Board Schematic Diagram partial 7 30 Manual Changes Model 4935A 1 2 3 4 5 6 7 8 9 A A ONE RCV O 04935 60107 e 0 2204 31 E e m 2 a c I 132 laz ie I ipa 054 1 4 055 t 4 2056 4 DS 5 10 105 6 6 Bl ae ea C2 i L uaar n E za 3 veg mn m M 4 ATTN 5 o C amp 9 2 SP RIP 25 RIS gt R20 19 M 17 j MONTE E if 615 D l rcv 215 7 a 37 74 al 5 ao mem pec 1 3 CR26 77 XMIT R36 R esie RS ur 6 4 CRY 9 5 GRID GRID REF GRID REF GAIO GRID REF GRID DESIG LOC LOC DESIG LOC DESIG LOC LOC DESIG LOC ow 5 O D m n D 4
174. 6447 0698 6446 0699 0582 0698 6360 0698 6360 0699 0590 0699 0597 0699 0597 0698 6360 0698 6360 0699 0591 4 1 8 TO 1102 F Deos MEI 111 2555 3883 C4 1 8 TO 1001 4 1 8 T0 825R F 1 8 0 1001 4 1 8 0 1 003 F 4 1 8 0 101 1 1 10 6467 09 455 51 12 C4 1 8 TO 101 F 4 1 8 0 5112 C4 1 8 TO 101 F C4 1 8 TO 5001 F 750 61 R100K 0698 6445 104 91 W 3489 CONNECTR SGL CONT PIN 025 N 56 52 SQ 1251 6947 CONNECTR SGL CONT PIN 025lN SSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 125 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTA SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN B8SC SZ SQ 1251 5947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT 025 5 52 SQ 1251 6947 CONNECTA SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN SSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 125 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 2 1251 6947 1251 6947 4 12516947 5 1251 6947 6 1251 8947 7 1251 6947
175. 7 RESISTOR 100K 1 125W TC 0 100 RESISTOR TRMR 2K 10 C TOP ADJ 17 TRN RESISTOR 511 1 125W F TC 0 100 RESISTOR 1 96 196 125W F TC O 100 RESISTOR 10K 1 125W F TC 0 100 RESISTOR 51 1 1 125W TC 0 100 RESISTOR 1 33K 196 125W TC 0 100 RESISTOR 750 1 125W F TC 0 100 RESISTOR 750 1 125W TC 0 100 RESISTOR 100K 196 125W TC 0 100 RESISTOR 1K 1 125W TC 0 100 RESISTOR TRMR 500 1096 C TOP ADJ 17 TRN RESISTOR 5 11K 1 125W F TC 0 100 RESISTOR 5 11K 1 125W TC 0 100 RESISTOR 10K 196 125W TC 0 100 RESISTOR 51 1K 1 125W TC 0 100 RESISTOR 14 7K 1 125W TC 0 100 RESISTOR 3 48K 196 125W TC 0 100 RESISTOR 51 1K 1 125W F TC 04 100 RESISTOR 10K 1 125W TC 04 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 10K 1 125W F TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 1K 196 125W TC 0 100 RESISTOR 51 1K 1 125W TC 0 100 RESISTOR 133K 1 125W TC 0 100 RESISTOR 10K 1 125W F TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 31 6K 1 125W TC 0 100 RESISTOR 825 1 125W F TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 11K 1 125W F TC 0 100 RESISTOR 8 25 1 125W TC 0 100 RESISTOR 681 1 125W F TC 0 100 RESISTOR 909 1 125W F TC 0 100 RESISTOR 10K 1
176. 8 16 Model 4935A Service 8 80 Input Select Notch Filter 25 dB Amp B 81 INPUT FILTER The 4935A receiver can select any of 3 inputs A balanced input through the receiver input transformer 2 The noise to ground input which senses common mode noise the input 5 The transmit monitor path which allows receiver to measure the transmitted signal Transient protection 1s provided 8 82 An analog switch enables selection of either receiver signal or transmitter signal Each signal can be routed through or by the notch filter The 25 dB amplifier is dependent on the amplitude of the received signal and may be bypassed by the microprocessor A buffer amplifier delivers the signal to the weighting filters 8 83 NOTCH FILTER The notch filter consists of three second order biquad notch filters The first has the zero located at 995 Hz The second has the zero at 1010 Hz The third has the zero at 1025 Hz 8 54 MONITOR 1010 BANDPASS FILTER The tone monitor path detects the holding tone loss in measurements The signal is bandpass filtered amplified and sent to the transmitter assembly ya FILTERS CMESG ISKHZ FLT E 3KHZ FLT PROGRAM 90 KILOBIT FLAT TONE FAR Figure 8 9 Filter Block Diagram 8 85 NOISE FILTER CIRCUITRY 8 86 FILTERS There are 6 noise weighting filters a C Message Filter b Program Filter 3 kHz Flat Filter d 15 kHz Flat Filter e 50 K Bit Filter f PAR Filter
177. 8 8 8 175 Transmitter Board Removal 8 30 Level Calculation Example 8 8 95171 JReassembly 8 31 Control Theory of 8 11 8 179 Power Supply Troubleshooting 8 33 Microprocessor to Instrument 8 11 8 181 Minimum Core Troubleshooting 8 34 System oci oou bb the 8 11 8 183 Procedure eee 8 35 Instrument to Microprocessor 8 12 8 186 Display Troubleshooting 8 36 Operator to Microprocessor 8 12 8 189 Control Troubleshooting 86 36 Keyboard Interrupt 8 12 8 190 Troubleshoot Keyscan Receiver Impedance Switches 8 12 Interrupt Crey ceci tios ess tp 8 36 Microprocessor to Operator 8 13 8 192 Control and Counting Section 8 13 TroubleshOoOLtfig uay 8 36 Instrument to Operator 8 13 8 194 Transmitter Troubleshooting 8 37 Montor Amp 8 13 8 196 Transmit Clock Generator 8 37 Beep Generator 8 13 8 200 Transmitter Signature Analysis Operator to Instrument
178. 82 582 3 9 5 L 8 0 sen 5 5 Lele 43 8 D r32 8 2 ti 5 5 0 ezn TO Qr 1H 5 0 1 2 42 9 50 SH ra 243 m 4 zzn 5 9 RE LY Q 8 3 izn 2 9 ea SSH 1022 042 90 eo ib 0912 9 3 692 M an eo Sti 3 ESH 5 65 9 5 3 990 22 ein 2 9 esu 85 2 Q 182 sin 1 9 v3 1612 3 992 OSH 9612 582 1 0 tin 9 3 8218 6 5812 5 3 98D 9 2 eun 9 4 Sio 9 5 5 9 S21H Lv 58 2 eso 5 5 gn r3 252 a3 199 4n She 1719 9 2 092 t9 9n 7 3 0 912 9 0 8 8 sn d 2214 2 0 2 H rJ 955 L8 n 1 9 5 459 9 8 OZIB 8 9 2 0 eso 58 ES 662 2Epes SEE ve 5 9 Bile O BCH 9 PD 2 f PT eo 2 2 p otio eg Q 9 0 Zdl yd iy 2 8 H 6212 8 0 emn 8 3 Sity c2 2 5 152 AF r D ZZdi 8 5 8 5 rod 55 2 2 962 6 2 19 8 amp 2 8 9 6 8 3 8 8 8 9 112 10 i8 itd 2 9
179. 89 6 to 9 86 6 to 82 7 90 0 to 87 0 to 83 1 90 5 to 87 4 to 83 5 90 9 to 87 8 to 83 8 91 3 to 81 88210 4 2 91 7 to 88 6 to 84 6 92 2 to 89 to 85 0 92 6 to 5 89 4 to 85 4 92 6 to 82 5 93 0 to 82 9 89 8 to 85 8 93 0 to 82 9 93 4 to 83 3 90 3 to 86 2 93 4 to 83 3 93 8 to 6 90 7 to 86 6 83 6 94 3 to 0 91 1 to 87 0 3 84 0 94 7 to 84 4 91 5 to 87 4 94 7 to 84 4 95 1 to 84 8 91 9 to 87 8 95 1 to 84 8 95 5 to 85 2 92 3 to 88 1 95 5 to 852 96 0 to 5 92 7 to 88 5 0 85 5 96 4 to 85 9 93 1 to 88 9 85 9 1 05925 to 94406 1 02329 to 97724 1 05925 to 94406 Model 4935A 10 5 dB 85 kHz 79 4 to 70 8 79 9 to 71 2 803 071 6 80 7 to 719 81 1 to 72 3 81 6 to 72 7 82 0 to 73 1 82 4 to 73 4 82 8 to 73 8 83 3 to 74 2 to 74 6 to 75 0 to 75 3 to 75 7 to 76 1 83 04 04 85 85 Ul Fe N 85 8 to 76 5 86 2 to 76 8 86 6 to 77 2 87 1 to 77 6 87 5 to 78 0 87 88 88 89 89 to 78 4 to 78 7 to 79 1 to 79 5 to 79 9 ce 90 90 90 91 91 to 80 2 to 80 6 to 81 0 to 81 4 to 81 8 UJ 92 92 93 93 93 to 82 1 to 82 5 to 82 9 to 83 3 to 83 6 co 4 94 94 95 95 96 to 84 0 to 84 4 to 84 8 to 85 2 to 85 5 O gr N UJ 96 4 to 85 9 1 05925 to 94406 Model 4935A PERFORMANCE TESTS ABBREVIATED TRANSMITTER FLATNESS TEST Usc test setup
180. 9 v Pdi 2018 53 j 9e _ oy Cdi 2 8 B5H 2282 S v2 T i3 968 1 3 v3 46d 68 91H 2 9 1024 968 TO Shu 2 9 566 _ 2 8 3 58 5 613 98 ted m 3 8 3 26H 5 8 en v 3 8 6 c3 i6d i 9 B ee Or 5 5 9 3 68 i 5 i s 9 LY 957 Ua pele 5 8 vH Es ssh 22 5 3 79 gu g esn 2 9 6 zu i f eo ish L9 18th red 5 fs osn UH le C5 ern ey 6418 3 nr i en 8 H gt 3 E 3 snr i ern rs 2 3 sn i i i igi i 2 9 3 sen gt 5 0 Pnr i I no Sei 23 tnn zd be m een EG 92 enr 2 3 eio i err 2918 2 0 52 inr cg 10 2 2 3 2 9 291 SiH oy 9 2 ma 1 9 Lait 2 in 62 q eer LD 69 93 9 8 e2 een 5SiH 8 3 Wedd 8 4 9245 5 3 5 8 5 cs wn 90 OHO g sen Ceo Sty big 90
181. A13C203 0160 6623 CAPACITOR FXD 1UF 20 0160 6623 A13C204 0160 6623 CAPACITOR FXD 1UF 2096 50VDC CER 0160 6623 A13C205 0160 3824 CAPACITOR FXD 3900PF 1 HEW 248 CAPACITOR FXD 01UF 20 CER 0160 6500 13 210 0160 6500 A13CR1 1901 1068 DIODE SM SIG SCHOTTKY 1901 1068 A13CR3 1901 0040 DIODE SWITCHING 30V 50MA 2NS DO 35 1901 0040 A13CR4 1901 0040 DIODE SWITCHING 30V 50MA 2NS DO 35 1901 0040 A13CR5 1901 0040 DIODE SWITCHING 30V 50MA 2NS 00 35 1901 0040 A13CR6 1901 0376 DIODE GEN PRP 35V 50MA DO 35 1901 0378 A13CR7 1901 0376 DIODE GEN PRP 35V 50MA DO 35 1901 0378 A13CR8 1901 0518 DIODE SCHOTTKY 5082 5508 A13CR9 1901 0518 DIODE SCHOTTKY 5082 5509 A13CR11 1901 0518 DIODE SCHOTTKY 5082 5509 A13CR12 1901 0518 DIODE SCHOTTKY 5082 5509 A13CR15 1901 0518 DIODE SCHOTTKY 5082 5509 A13CR16 1901 0518 DIODE SCHOTTKY 5082 5509 A13CR26 1901 0050 DIODE SWITCHING 80V 200MA 2NS DO 35 1901 0050 A13CR27 1901 0050 DIODE SWITCHING 80V 200MA 2NS DO 35 1901 0050 A13CR28 1901 0050 DIODE SWITCHING 80V 200MA 2NS 00 35 1901 0050 NNONANAG O 0U A13CR29 1901 0050 DIODE SWITCHING 80V 200MA 2NS DO 35 1901 0050 A13CR30 1901 0050 DIODE SWITCHING 80V 200MA 2NS DO 35 1901 0050 A13CR31 1901 0050 DIODE SWITCHING 200MA 2NS DO 35
182. A14CR7 1902 1399 7 DIODE ZNR 18 0V 2 PD 4W INS248 A14CR9 1901 0731 7 DIODE PWR RECT 400V 1A 1901 0731 At4CR10 1901 0731 7 DIODE PWR RECT 400V 1A 1901 0731 A1T4CRI I 1901 0731 7 DIODE PWR RECT 400V 1A 1901 0731 A14CR12 1901 0731 7 DIODE PWR RECT 400V 1A 1901 0731 A14CR13 1901 0033 2 DIODE GEN PRP 180V 200 00 7 1901 0033 A14CR14 1901 0033 2 DIODE GEN PRP 180V 200 00 7 1901 0033 14 15 1902 1399 7 DIODE ZNR 18 0 2 PN 4W INS248 A14CR16 1901 0731 7 DIODE PWR 400V 1901 0731 14 17 1901 0721 7 DIODE PWR 400V 1A 1901 0731 At4CRIB 1901 0731 7 DIODE PWR RECT 400V 1A 1901 0731 A14CR19 1901 0033 2 DIODE GEN PRP 180V 200 00 7 1901 0033 A14CR20 1901 0033 2 DIODE GEN PRP 180V 200MA D0 7 1901 0033 14 23 1902 1399 7 DIODE ZNR 18 0V 2 PD 4W INS248 A1CR24 1884 0250 7 THYRISTOR TRIAC 220 T25008 A14CR25 1902 0052 7 DIODE ZNR 6 81V 2 PD 4W Z 30016 1135 14 26 1901 0731 7 DIODE PWR 400V 1A 1901 0731 14 27 1901 0033 2 DIODE GEN PRP 180 200 00 7 1901 0033 A14CR28 1901 0033 2 DIODE GEN PRP 180V 200MA 00 7 1901 0033 14 29 1902 0202 9 DIODE ZNR 15V 5 D0 15 PD 1W TC 057 1902 0202 A14CR30 1902 0202 9 DIODE ZNR 15V 5 D0 15 PD 1W TC 057 1902 0202 14 1251 6947 0 CONNECTOR SGL CONT P 025IN BSC SZ SQ 1251 6947 A14CSA2 1251 6947 0 CONNECTOR SGL CONT P 025IN BSC SZSQ 1251 6947 A14J2 1251 6947 0 CONNECTOR SGL CONT P 025 5 52 lt 0 1251 6947 1443 1251 4573 4 CONN
183. A3R83 0698 4158 2 RESISTOR 100K 190 125W 0 50 0698 4158 A3RB4 0698 6360 RESISTOR 10K 1 125W 0 25 0698 6360 85 0698 4158 RESISTOR 100K 190 125W 0 50 0698 4158 A3RB6 0698 6360 RESISTOR 10K 190 125W 0 25 0698 6350 A3R87 0698 4490 2 RESISTOR 29 4K 1 125W 0 100 C4 1 8 10 2942 F A 3R88 0698 4490 9 RESISTOR 29 4K 1 125W F TC 0 100 C4 1 8 T0 2942 F A3RB9 0699 0566 4 4 RESISTOR 25 5K 190 125W F 0 25 0699 0566 A3R90 0699 0566 4 RESISTOR 25 5K 1 125W F TC 0 25 0699 0566 A3R91 0757 02B0 3 RESISTOR 1K 1 125W 0 100 C4 1 BT0 1001 F A3R92 0698 7847 6 RESISTOR 1 111K 1 125W 0 25 MFAC1 8 T9 1111R B A3R93 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A3R94 0698 8638 5 2 RESISTOR 3 16 1 125W 0 25 0698 8638 A3R95 0698 6445 B 3 RESISTOR 6 838 1 125W 0 25 0698 6445 A3R96 0699 0586 8 RESISTOR 186 365K 1 125W 0 25 0699 0586 A3R97 0699 0585 7 1 RESISTOR 240 730 1 125W 0 25 0699 0585 A3R98 0698 6467 d RESISTOR 16 9K 196 125W 0 50 0698 6467 A3R99 0699 0587 1 RESISTOR 12 910 1 125W 0 25 0699 0587 A3R100 0699 0588 2 RESISTOR 1817 1 190 125W 0 25 0699 0588 102 2100 3883 RESISTOR TRMR 5K 10 C TOP ADJ 17 TRN 2100 3883 A3R103 0698 7413 2 RESISTOR 17 4K 25 125W 0 100 MF4C1 8 T0 1742 C A3R104 0698 6423 2 RESISTOR 31 25K 1 125W 0 25 0698 6423 A3R105 0698 7413
184. ASCRE 1901 0050 DIODE SWITCHING BOV 200MA 2NS DO 35 1901 0050 ASCR10 1901 1091 DIODE PWR RECT 50 5A 200NS A115F ASCRI2 1902 0041 DIODE ZNR 5 11V 5 00 35 PD 4W 1902 0041 5 14 1901 0050 DIODE SWITCHING 80V 200 2 5 DO 35 1901 0050 A5CR15 1901 0050 DIODE SWITCHING 80V 200MA 2NS DO 35 1901 0050 5 16 1902 0554 DIODE ZNR 10 5 00 15 PD 1W 06 1902 0554 ASCRI7 1902 0184 DIODE ZNR 16 2V 5 D0 35 PD 4W 1902 0184 ASCR18 1902 0184 DIODE ZNR 16 2V 59 2 D0 35 PD 4W 1902 0184 A5CR19 1901 0050 DIODE SWITCHING 80V 200MA 2NS DO 35 1901 0050 A5CR20 1901 0050 DIODE SWITCHING 80V 200MA 2NS D0 35 1901 0050 A5CR2 1 1901 0050 DIODE SWITCHING 80V 200MA 2NS 00 35 1901 0050 A5CR22 1901 0050 DIODE SWITCHING 80V 200 2NS 00 35 1901 0050 A5CR23 1901 0050 DIODE SWITCHING 80V 200MA 2NS 00 35 1901 0050 5 24 1901 0050 DIODE SWITCHING 80V 200MA 2NS 00 35 1901 0050 ASCR25 1901 0050 DIODE SWITCHING 80V 200MA 2NS D0 35 1901 0050 ASCR26 1901 0050 DIODE SWITCHING 80V 200MA 2NS D0 35 1901 0050 ASCR2 1901 0050 DIODE SWITCHING 200MA 2NS 00 35 1901 0050 ASCR28 1901 0050 DIODE SWITCHING 80V 200MA 2NS 00 35 1901 0050 5 29 1901 0050 DIODE SWITCHING 200 2NS 00 35 1801 0050 1901 1091 DIODE PWR RECT 50V 200 5 A115F ASCR31 1901 1091 DIODE PWR RECT 50V 5A 200NS A115F 2110 0568 2110 0568 2110 0568 FUSE 4A 125V 281X 093 F
185. Both switches out simultaneously or depressed simultaneously internally loops the transmitter to the receiver DIAL Binding Posts Handset can be connected to binding posts to dial up a line through the 310 lacks SET UP Switches TRMT 13512 6000 90082 Provides terminating impedance to match the lines characteristic impedance DIAL Disconnects TRMT RCV 310 jack from the transmitter and connects the TRMT RCV 310 jack to the DIAL binding posts HOLD Connects the hold circuits to the TRMT RCV 310 jacks to hold dial up lines RCV 13512 60011 90012 Provides terminating impedance to match the lines characteristic impedance KRG Connects the RCV TRMT 310 jack through high impedance when the 4935 bridges the circuit under test instead of terminating the line HOLD Connects the receive hold circuits to the RCV TRMT 310 jack to hold the dial up lines DISPLAY Key TKMT RCV Selects either the transmitted or the received signal to be displayed Corresponding LED will light SKIP Key Prevents the transmitter from transmitting within 150 Hz 300 Hz band of designated frequency This feature eliminates accidental disconnection by SF signaling units on dial up lines Operates only in LEVEL FREQUENCY LED will light when key is pressed LEVEL ZERO Key Sets a 0 dB reference in KCV LEVEI FREQUENCY mode subsequent measurements will be made in dB relative to this reference DB LED in center of front panel will
186. C En DISPLAY 1 He STBY E POWER dBrn a r A A CNTNG f NOR RCV MEASUREMENT FILTER Ss cn pe NOISE 3 KHz FLAT SSS a NOISE PROGRAM NON STOP TIMER UJ 50 KBIT MONITOR PERIOO DISPLAY VOLUME DIAL NOISE 404 GROUND START MEAS STOP OO IB Gilles Ee leap 5 NOISE WITH TRANSMITTER b NOISE WITH 3 10 Press MEAS key to select NOISE WITH TONE Press DISPLAY TRMT RCV key to display the transmitted signal TRMT light will be on and 1004 Hz should be in right display Turn OUTPUT 1 EVEI knob to adjust 1004 Hz signal to data level in left display usually 13 dB below the transmission level point TONE RECEIVER Press MEAS key to select NOISE WITH TONE Press DISPLAY TRMT RCV key to display the received signal RCV light will be on Read dBrn in left display Note Err 7 in the right display indicates the received 1004 Hz tone has dropped below 46 dBm or exceeded 13 dBm Figure 3 2 Measurements Continued Model 4935A 7 4935A TRANSMISSION TEST SET OUTPUT p HEWLETT PACKARD CJ THRESH CNTS LEVEL ON kHz DISPLAY C dB Hz COMIN A A LJ dBrn A A A A A CNTNG REV SF LEVEL STEP STEP Non SKIP ZERO
187. Carefully pull the front panc directly away from the switch board TRANSMITTER BOARD REMOVAL Remove receiver board shicld battery pack charger board assembly Remove switch board front pancl assembly Remove all spacer parts Gently lift transmitter board and back pancl assembly from lower case as a unit To remove back panel assembly d Remove hardware holding 3 power supply transistors to back panel b Desolder leads from power transformer to transmitter board c Remove 2 screws holding transmitter board to back panel d Back panel will come off Modcl 4935A Service 8 177 REASSEMBLY 8 178 Seating the case top on some 4935A s is difficult The front panel chips or peels at the edges if the case is forced onto the instrument Follow the procedure below for correct reassembly Reassemble the transmitter board and back panel tf necessary 2 Reconnect W2 to the edge connector 3 Replace transmitter board and back pancl in lower half of casc 4 Align and press together switch board and front panel 3 Slide switeh board and front back into retaining grooves To avoid damaging the front panel it should be eased carefully into place 6 Insert the four large plastic standoffs 7 Replace receiver board and shield plate On battery options reconnect ASWI before replacing battery charger board shield plate 8 Route W5 towards the front panel then onto
188. DISPLAY ASSY ANNUN STROBE 58 C81 0 1 P O J1 D MUX EN T 22 TO A3 A13 x 21 RECEIVER ASSY CE 1 P CE 2 3 4 5 UN 6 P ae p occ cp G dau sol cal 35 d j d c i CE 15 MEME s be ES f 45 3 B f 1 5 m K ype 65 2 RECEIVER ASSY 4 06 ENABLE DECODER 5 O X SHT 3 E ey eT O S U28 5 amp U30 5 SHT 3 4 ccs O U29 5 amp 027 5 SHT 3 0 1 OU 026 5 SHT 3 2 5V 20 TP1 2 5V DUAL i ar c ure re QUAD 3UF FER 11 MES c de d T lc 1 i o 2 5 2 2222222 O H 09 10 11 12 SHT 1 a 35A14SH2 10 88 Figure 8 37 A4 Transmitter Board Schematic Diagram Sheet 2 of 5 8 85 _ _ 4 A14 TRAD FROM SHT 2 FROM U7 4 SHT 2 S db ae ugs FROM U7 6 SHT 2 U PHASE ACCUMUL A TOI R73 3 161 5 be CIRCUIT APPLIES TO STANDARD UNITS ONLY fas CIRCUIT APPLIES TO P PR UNITS ONLY Tu i FROM U17 8 SHT 1 s n UIz J P O A4 A14 TRANSMITTER BOARD FROM SHT 25 XC FROM U7 4 SHT 2 S FROM U7 5 SHT 2 T 9 64 FROM
189. F C4 1 8 TO 681R F C4 1 8 TO 1002 F C4 1 8 TO 1002 F 2100 3881 C4 1 8 TO 3161 F 2100 3882 6 35 Replaceable Parts Model 4935A P Part umber Description signator 14875 0757 0442 8 RESISTOR 10K 1 125W TC 0 100 4 1 8 0 1002 A14R76 0757 0442 9 RESISTOR 10K 1 125W F TC 0 100 C4 1 8 TO 1002 F A14R77 0757 0442 9 RESISTOR 10K 1 125W TC 0 100 C4 1 8 TO 1002 F A14R78 0757 0180 2 RESISTOR 31 6 1 125W TC 0 100 0757 0180 A14R79 0757 0180 2 RESISTOR 31 6 1 125W TC 0 100 0757 0180 A14R80 0757 0428 RESISTOR 1 62K 1 125W MF4C 1 A14R81 0757 0431 RESISTOR 2 43K 196 125W 4 1 A14R82 0698 0084 RESISTOR 2 15K 196 125W TC 0 100 C4 1 8 TO 2151 F A14R83 0698 6393 RESISTOR 585 196 125W F 0 25 5033R RESISTOR 10 6K 196 125W TC 0 100 0699 0763 RESISTOR 10K 196 125W TC 04 100 A14R85 0699 0763 A14R86 0757 0442 4 1 8 0 1002 A14R87 0698 4437 RESISTOR 2 94K 1 125W TC 0 100 C4 1 8 TO 2941 F A14R88 0698 6360 RESISTOR 10K 196 125W F TC 0 25 0698 6360 A14R89 0698 6360 RESISTOR 10K 1 125W TC 0 25 0698 6360 A14R90 0757 0442 RESISTOR 10K 1 125W TC 0 100 4 1 8 0 1002 A14R91 0757 0289 RESISTOR 13 3K 1 125W TC 0 100 MF4C1 8 TO 1332 F A14R9
190. FXD O1UF 10 CER CAPACITOR FXD O1UF 10 50VDC CER CAPACITOR FXD 01UF 10 50VDC CER CAPACITOR FXD 01UF 10 5OVDC CER CAPACITOR FXD O1UF 1 10 50VDC CER CAPACITOR FXD OIUF 10 50VDC CER CAPACITOR FXD 01UF 10 CER CAPACITOR FXD O1UF 10 CER CAPACITOR EXD 010 10 CER CAPACITOR FXD O1UF 1 10 50VDC CER CAPACITOR FXD 01UF 10 50VDC CER CAPACITOR FXD 01UF 10 50VDC CER CAPACITOR FXD OTUF 10 50VDC CER CAPACITOR FXD 01UF 10 CER CAPACITOR FXD 01 10 SOVDC CER CAPACITOR FXD 01 0 10 50VDC CER CAPACITOR FXD OIUF 10 CER CAPACITOR FXD IUF 20 50VDC CER CONNECTOR SGL CONT PIN 625IN BSC SZSQ DIODE ZNR 5 1 IV 5 DC 35 PD 4W DIODE GEN PRP 180V 200MA DO 7 DIODE PWR 400V 1A DIODE ZNR 18 0V 2 PD 4W DIODE PWR 4WV IA DIODE PWR RECT 400V 1A DIODE PWR RECT 400V IA DIODE FWR RECT 400V 1A DIODE GEN PRP 180V 200MA Do 7 DIODE GEN PRP 180V 200 DIODE ZNR 18 0V 2 PD 4W DIODE PWR RECT 4WV IA DIODE PWR 4WV 1A DIODE PWR 4WV 1 DIODE GEN PRP 180V 200MA W 7 DIODE GEN PRP 180V 200MA 00 7 DIODE ZNR 18 0V 2 PD 4W THYRISTOR TRIAC 220 DIODE ZNR 6 81V 2 PD 4W DIODE PWR RECT 4WV IA DIODE GEN PRP 180V 200MA DC 7 DIODE GEN PRP 180V 200MA DO 7 DIODE ZNR 15V 5 W 5 PD IW TC 057 DIODE ZNR 15V 5 w 15 PD IW 57 CONNECTOR SGL CONT 025 5 52
191. FXD IUF 20 25VDC CER CAPACITOR 75 300 N P CAPACITOR FXD 2 2UF 10 20VDC TA CAPACITOR FXD 2 2UF 10 20VDC TA CAPACITOR FXD IUF_020 50VDC CER CAPACITOR FXD 20 CAPACITOR FXD 1UF 20 5OVDC CER CAPACITOR FXD UF 20 25VDC CER CAPACITOR FXD 10UF 10 20VDCTA CAPACITOR FXD 15UF 10VDC TAR CAPACITOR FXD 022UF 2096 100VDC CER CAPACITOR FXD IUF 1096 50VDC CER CAPACITOR FXD 1UF 10 35VDC CER CAPACITOR FXD 01UF 10 CER CAPACITOR FXD 1 1096 CER O1UF 10 50VDC CER CAPACITOR FXD 01UF 10 CAPACITOR FXD 01UF 10 5OVDC CER CAPACITOR FXD OIUF 10 50VDC CER CAPACITOR FXD 01UF 10 MVDC CER CAPACITOR FXD O1UF 10 50VDC CER CAPACITOR FXD OIUF 10 5OVDC CER CAPACITOR FXD OIUF 10 5 CER CAPACITOR FXD 01UF 10 CER CAPACITOR FXD OIUF 10 5OVDC CAPACITOR FXD 01UF t lO 5OVDC CER See introduction to this section for ordering information ndicates factory selected value Model 4935A fr Part umber 04935 60031 0160 3815 0160 3815 0160 3815 0160 6623 0180 3045 0180 4017 0160 6623 0160 8623 0160 8623 0180 6623 01 50 3045 0180 4017 01804458 0160 6623 0180 3044 0160 6623 0160 6623 0160 3456 0160 6623 0160 6623 0160 6623 0180 4791 0180 4807 0160 4807 0160 6623 0160 6623 0160 6623 0180 3050 0160 6623 0180 8823 0160 6623
192. OY n Gi fo G2 62 ow H mmoooooocooocoo 6 7 7 B 1 2 2 5 fb Figure 7 21 2 Switchboard Component Locator 22 1 ass i 14084 V Iw QL i ope i DIO6 SMid la S3NI1 3SN3S N sa I assy pi eti ERE OBI et Id Ord E 9 Di a M 1 a irs iN I Cv gt i i B 1 1 1 D E H 8 i i ASST _ 9m S 1 3 gs 1 1 JililfMEMYun O 1 n i i a 9006 NO a foo 9 4 2991 971135 i truoc P P 202 H UP enu te 2 2 fos sz 2 30 55 h i ee ASHP i 5 i YO 2 0 4 4 155 B3A13238 v 49575 c8 zzy os Dio S 39 006 Ts 7 S gos Sz 1 U QAB i 903 S i
193. Page 6 32 Table 6 3 Replaceable Parts Replace AIACRI17 with 1901 0731 Diode pwr rect 400V 1A CD 4 MFG CODE 03508 MFG P N Replace A14CR18 with 1901 0731 Diode pwr rect 400V IA CD 4 MFG CODE 03508 MFG P N 15 Add A14CR21 1901 0754 Diode pwr rect 50V CD 4 MFG CODE 03508 MFG P N 1 Add A14CR22 1901 0754 Diode pwr rect 50V CD 4 MFG CODE 03508 MFG P N 15 CHANGE 7 Page 6 6 Figure 6 2 Exploded View Assemblies and Cables Cont d Replace Item 29 with Rear Panel Assy loaded 04935 60008 Page 6 12 Table 6 3 Replaceable Parts Delete A3C202 Hand Selected Capacitor Page 6 13 Table 6 3 Replaceable Parts Replace A3CR8 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Replace A3CR9 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Replace A3CRI11 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Replace A3CR12 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Replace 15 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Replace 16 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 7 9 Manual Changes Model 4935A CHANGE 7 Contd Replace A3R50 with 0757 0159 Resistor 1K 1 5 W CD 5 MFG CODE 28480 MFG P N 0757 0159 Replace A3R51 with 0757 0280 Resistor 1 125 W CD 3 MFG CODE 24546 MFG P N C4 1 8 TO 1001 F Page 6 14 Table 6 3 Replaceable P
194. SGL CONT PIN 04IN RSCSZ RND 28480 0360 0124 1200 0666 SOCKET XSTR 3 CONT POWER DIP SLDR 28480 1200 0666 1251 4259 CONNECTOR SGL CONT PIN 031 IN BSC SZ 28480 1251 4259 1251 5063 CONNECTOR 6 PINM POST TYPE 28480 1251 5063 Model 4935A See Introduction to this section for ordering information Indicates factory selected value 6 22 Model B 4935A eference esignator 04935 60029 0180 0291 0180 1746 0180 0097 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 1091 1902 0041 1901 0050 1901 0050 1802 0554 1902 0184 1902 0184 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1801 0050 1901 0050 1901 0050 1801 1091 1901 1091 2110 0712 2110 0712 2110 0712 1251 4245 1251 4245 1251 4246 0490 0568 1853 0406 1854 0575 1853 0036 1854 0215 1853 0036 1853 0036 1853 0036 1854 0215 1854 0215 1854 0215 1854 0727 1853 0036 1853 0406 0757 0418 0757 0465 0757 0458 0757 0442 0757 0280 0757 0442 0757 0465 0699 0653 0757 0442 0699 0591 0698 6358 5 3 5 7 5 5 5 5 5 3 3 3 3 3 3 4 4 3 3 4 6 6 3 3 3 3 3 3 3 3 3 3 3 4 4 2 2 2 7 7 8 5 0 6 2 1 2 2 2 1 1 1 ADOMDO WONDOoO ONO P Part 5 BATTERY CHARGER BOARD Opts 001 amp 003 BATTERY CHARGER BOARD OPTS 001 amp 003 CAPACITOR FXD 1UF 10 35VDC TA CAPACI
195. TUBE ELECTRON SURGE V PICTR 81 350 15 25 1 9160 0273 1 LOUD SPEAKER 9160 0273 2 CONNECTOR SGL CONT PIN 025 IN BSC 1251 6947 A2TP4 CONNECTOR SGL CONT PIN 025 IN BSC 1251 6947 202 1920 2132 2 CMOS LED ICM721BA A2U3 1820 2132 IC DRVR CMOS LED ICM721BA A2U4 1826 0205 1 IC TIMER TTL NE556A A2U6 1826 0682 1 IC AUDIO AMPL PWR 8 DIP P PKG LM366N 1 A2U7 1826 0712 1 IC OP AMP LOW BIAS II IMPD DUAL 8 DIP P LF353N A2xDS 1200 0915 9 SOCKET DSPL 14 DIP DIP SLDR 1200 0915 A2XDS2 1200 0915 SOCKET DSPL 14 DIP DIP SLDR 1200 0915 A2XDS3 1200 0915 SOCKET DSPL 14 DIP DIP SLOR 1200 0915 A2xDS4 1200 0915 SOCKET DSPL 14 DIP DIP SLDR 1200 0915 A2XDS5 1200 0915 SOCKET DSPL 14 DIP DIP SLDR 1200 0915 A2XDS6 1200 0915 SOCKET DSPL 14 DIP DIP SLOR 1200 0915 2 057 1200 0915 SOCKET DSPL 14 DIP DIP SLDR 1200 0915 A2XDS8 1200 0915 SOCKET DSPL 14 DIP DIP SLDR 1200 0915 A2XDS9 1200 0915 SOCKET DSPL 14 DIP DIP SLDR 1200 0915 0340 0992 2 INSULATOR TRANSISTOR 0340 0992 0300 1013 2 SPACER RND 688 IN LG 115 IN ID ORDER BY DESCRIPTION 2200 0173 2 SCREW MCH 4 40 1 IN LG 82 DEG ORDER BY DESCRIPTION 2260 0012 2 NUT HEX W LKWR 4 40 THD 094 IN THK ORDER BY DESCRIPTION 2360 0197 4 SCREW MCH 6 32 375 IN LG PAN HD POZI ORDER BY DESCRIPTION 2420 0015 1 4 NUT HEX W LKWR 6 32 094 IN THK ORDER BY DESCRIPTION 5041 0201 6 1 KEY CAP WHITE POWER SWITCH 5041 0201 5041 1931 1 1 KEY CAP NOR REV TRMT 5041 1931 5041 1932 2 1 KEY CAP REV
196. Table 8 11 Autorange States SWITCH SETTINGS S2 PINS S3 PINS GAIN WANTED 2 15 3 14 o a Closed Closed Closed Closed Open Open Open Open Closed Closed Open Open Closed Closed Open Open Closed Open Closed Open Closed Open Closed Open Closed Closed Closed Closed Closed Closed Open Open O OD gt O O O O gt 4 When you are finished remove the DIP switch and replace U7 8 279 HAND SELECTION OF A3C57 AND A3C160 A13 C57 AND A3C160 FOR P AR UNITS FOR DESIRED FREQUENCY RESPONSE 8 280 Three things affect the frequency response of the 4935A receiver in LEVEL FREQUENCY if everything is functioning correctly 1 The input transformer 2 The buffer amp at input 030 3 The 150 kHz low pass filter LPF at the autorange output 8 281 Ifan instrument fails to meet the frequency response specification 5 dB at the frequencies listed in the frequency response table below first check for an instrument failure This might include op amps that distort the signal losses or gains through switches CMOS switches tip or ring on the input terminal being grounded either through a direct short or a finite resistance etc Second the 150 kHz LPF should be rechecked Use the table in the receiver test procedure Third the U30 buffer amplifier should be checked In particular check for incorrect or out of to
197. This provides a firm cushion and prevents movement inside the container Protect the front panel with cardboard or the front cover 4 Seal carton securely and mark FRAGILE to ensure careful handling 2 22 TAGGING FOR SERVICE If the instrument is being returned to Hewlett Packard for service please complete one of the blue tags located at the back of this manual and attach it to the instrument Model 4935A Installation Table 2 1 HP Flug Styles Cable Plug Cable For Use Plug Type Description Length Color In Country inches 8120 1351 Straight BS13634A 90 Mint Gray United Kingdom 8120 1703 90 90 Mint Gray Cyprus Nigeria Rhodesia Singapore 8120 1369 Straight 255193 5 112 79 Gray Australia 8120 0696 90 New Zealand 8120 1689 Straight CEE7 Y 11 79 Mint Gray East and West 8120 1692 90 79 Mint Gray Europe Saudi Arabia Egypt S o Africa India unpolarized in many nations 8120 1348 Straight 5 15 80 Black United Stares 8120 1398 90 80 8120 1754 Straight 5 15 36 Black Japan 100V 8120 1378 Straight NEMA5 15 80 Jade Gray 200 8120 1521 90 80 Jade Gray Mexico 8120 1676 Straight 5 15P 36 Jade Gray Philippines Taiwan 81202104 Straight SEV101 1 Gray Switzerland 1959 24507 Type 12 United States Canada Straight NEMA6 15 8120 0698 8120 1957 2 8120 2956 Straight DHCK 107 90
198. U7 6 SHT 2 U O awan PHASE ACCUMULATOR 5V R73 3 16K 20 5V TRNDARD LINITS ONLY PR UNITS ONLY SINE OSC i U23A FROM U17 8 SHT 1 J 262 KI r p Ya p 1 262 2 R45 10K 5V m XE a 5V I Te 5v V PHASE STEP LATCHES C102 16 10k tars 16 0 01 1 8 bc 35A14SH3 10 88 Figure 8 38 A4 Transmitter Board Schematic Diagram Sheet 3 of 5 8 87 P O 4 14 TRANSMITTER BOARD ASSY 04935 60034 REV A 2830 38 lt m M 59 5V 20 44 18 19 a 12 7 3 CD FF 10 N FOR FUTURE USE lt 94 et o M M 2850 58 455 Bie cem Mies mes que QOL gend ai dd CURRENT TO VOLTAGE CONVERTER 7 TAN EO 2 aoe ___ TEN q R41 WAVEFORM 1000 5V DIGITAL ANALOG CONVERTER C101 0 01 NC z x2 R44 f v vooo ee THERME d EM 14 511 0 01 0 1 9 3 pe Goes ee 2200 ee rem 45V C107 0 01 14 5 U48 6 9 NB NC
199. a transmit monitor signal to the receiver board In several measurement modes the transmitter has no output signal but is quiet terminated 8 6 The switch and display circuits have four major functions First to provide data storage and drive for the segment display and the annunciator LEDs Second connect the front panel membrane switches to the microprocessor and counting circuits Third provide an audio amplifier and speaker to monitor the received signal and generating circuit signal when a touch button 15 pressed Fourth connect the front panel jacks to the transmitter and receiver after selection of the proper impedances Also provides dial connections and hold currents as required receiver termination selections are routed to the microprocessor and control circuits 8 7 The power supply provides 5 V at 600 mA and 14 at 200 mA Options 001 and 003 add batteries and a battery charger board to the power supply Model 4935A 8 8 8 9 Service HOW MEASUREMENTS ARE MADE This section describes how the 4935A makes measurements and conditions that can be expected during normal operation Table 8 1 summarizes some of this information MEASUREMENT Level and Frequency TRMT Display RCV Display Noise TRMT Display RCV Display Noise TRMT Display RCV Display Signal to Noise TRMT Display RCV Display Signal Noise Impulse Noise TRMT Display RCV Display Noise to Ground TRMT
200. and a channel is considered acceptable the P AR rating can he recorded for future reference In case of a suspected trouble on the channel P AR may be measured first and he compared to the benchmark P AR value Deviations in excess of 4 P AR units from an initial P AR value provides sufficient reason to suspect that some channel characteristic has changed significantly 3 27 3 28 blank Model 4935A Performance Tests SECTION IV PERFORMANCE TESTS 4 1 INTRODUCTION 4 2 Tests in this section verify instrument specifications These tests may be used as part of incoming inspection and can be done without accessing the instrument s internal circuits If the instrument fails the tests refer to the Service Section 4 3 EQUIPMENT REQUIRED 4 4 Equipment required for the performance tests is listed in Table 1 2 Test equipment with similar characteristics may be substituted 4 5 TEST RECORD 4 6 Test results may be recorded on the test record located at the end of this section Results of tests recorded during incoming inspection can be used for comparison in maintenance troubleshooting and following repairs and or adjustments 4 7 SELF CHECK 4 x Self check is automatically done each time the instrument is powered up Some circuits and filters arc tested in addition to all the front panel leds and seven segment displays 4 9 PERFORMANCE VERIFICATION 4 10 This instrument requires periodic performance verification Dependi
201. counter is between 84 996 kHz and X5 004 kHz 4 2 Model 4935A PERFORMANCE TESTS Table 4 l Transmitter Flatness at 10 dBm FREQUENCY ACCEPTABLE VOLTAGE 2 17 to 2 73 Vrms 2 38 to 2 49 Vrms 2 38 to 2 49 Vrms 2 38 to 2 49 Vrms 2 30 to 2 58 Vrms 2 30to 2 58 Vrms 2 25 to 2 64 Vrms ABBREVIATED TRANSMITTER FLATNESS AT 10 dBm TEST See the Abbreviated Transmitter Flatness Test RANGE Performance Tests 4 3 Performance Tests 4935A PERFORMANCE TESTS 4 14 Transmitter Flatness at 40 dBm SETUP MODEL 4935A VOLTMETER B AC CALIBRATOR O Q O amp B Figure 4 2 Transmitter Flatness Test at 40 dBm EQUIPMENT Fluke 5200A AC Calibrator j 10 to banana adapter 20 dB amplifier see figure 4 1 3 2 banana plug test cables 6234A Dual Output Power Supply HP 3490A Multimeter l Set up the 4935A as follows DISEEAY 2 C C C f press n SET UP T pres in TRMT 6000 HRG out DIAL out both HOLDs out MEASUREMENT LEVEL FREQUENCY IMPULSEN OISE press DISPLAY 1004 Hz 2 Adjust Power Supply to provide 12 V to the 20 dB Amplifier ne Set the AC Calibrator and the 4935A to exactly 40 dBm as follows a Set the AC Calibrator to 7 746 mV 40 dBm into 600 ohms at 1004 Hz with the output floating Connect the AC Calibrator to the 20 dB amplifier input Record the amplifirr output voltage Connect 20 dB amplif
202. dBm Model 4935A REGI PREG LEVEL ax jon el Service bod FREQUENCY MEASUREMENT LEVEL MEASUREMENT Figure 8 4 Frequency and Level Measurement Timing 5 41 measure level and frequency the microprocessor autoranges the signal until it is within a 14dB window approximately 6 to 30 kHz from the V toF converter in the detector circuit The following is a description of the level and frequency measurement 1 Schmitt triggers U25A and 0258 square the autoranged sinewave If a tone frequency 1s to be measured for example 1000 Hz in noise with tone measurement the microprocessor selects it by writing a 0 to Q3 of latch U11 This signal must be intercepted prior to the notch filter for measurement 2 The start command is generated by writing a one to Q1 of latch U11 3 The microprocessor U6 29 resets counters 1 and 2 4 The microprocessor U6 pin 30 enables counters 1 and 2 to begin counting The Open signal is clocked out of RS flip flop U18 the next rising edge of the frequency waveform This signal is generated to ensure that counting takes place for exactly an integer number of frequency cycles 6 The Open signal is used to gate the frequency signal through NAND gate U16B and into pin 3 of counter no 1 re The Open signal also gates the 262 kHz clock through NAND gate U17C and into pin 3 of counter no 2 8 9 Ser
203. failed components from the board and the desolder and remove lead remains 8 162 VACUUM DEVICE A vacuum device such as the Soldapullt9 Model DS 017 is used with a soldering iron to remove melted solder from the terminals 8 165 DESOLDERING BRAID A copper braided wire such as Solder Wick no 2 size is used with the soldering 1ron to absorb the melted solder 8 164 Soldering 8 165 Integrated circuit or the printed circuit boards can be damaged by excess heat ICs can also be damaged by static charges from handling or from the soldering iron when installing them The recommended soldering iron to use is the Ungar 3 wire type with a 35 watt maximum heat element and the Ungar Micro Spade tip The recommended solder is Kester Rosin Core 60 40 with a diameter of 032 inches This diameter works very well with IC pins and leaves minimum residue 8 166 Cleaning 8 167 Cleaning the board and components after soldering is important Use a cleaning solution such as Reliasolv No 5639 Apply the solution with a small stiff bristle brush and scrub the area previously soldered No residue should remain after the solution dries NOTE not use chlorothene freon or kenco 192 to clean electrolytic capacitors as these cleaners may damage them L a SE Edsyn Company Solder Removal Company Alpha Metals Inc 8 28 Model 4935A 8 168 8 169 8 170 8 171 8 172 Service DISASSE
204. fle SSH 6512 s iH 85120 5 0 j 258 SLO 258 9610 sin I H O 5510 gt vin 7512 52 ein 49 60 SH 2512 8 2 zn 279 60 2510 8 2 so 80 er 1719 i 9 0 sn ro er 82 L i Solet d 9 0 in G tH SPL is a 50 90 ved rH 7710 ig od 6 8 sn is 25 215 66 iti La n 29 jj S 5 24 9 8 6 0919 d 9 8 in 25 826 eu 65 9 os nura 5 0 Szdl 2 5 ra 1612 d 8 0 ted 6H 2 2717 cm 64 Stu 6H 6 5 99121 qon 8 0 2241 64 6 0 1512 4 rO ile Berney 62 tzal 69 62 9 2 70919 1 8 9 Sidi 44 60 212 53 Sro a ea excesserit ON Midi 3 6 0 tro i 5 6194 23 Oily ezto O T i PES 3 2141 od
205. gt l E A T e i i g X a ER quera au ette 66 EE A OE Al pe 137 25 wit 2 2 gt C 0 SAGAS 6 ol 4 2 tora N u i ES D NT 3 9 4 Jg 7094 I 3 iss ri is q i TA el ELE i s D pad i 0040 Do Ie a hn i 5 H ar we ui pet E v dg M 5 2 Xx lt 4 C i ly oi t n au 8 1249 2 e NN nu atb M 1 2 Li 4 1 dd 4 Figure 7 10 Receiver Board Component Locator 7 20 g ig Z 10 1 pieog 1 L EV n UE PER a lt lt gt w s In m m 4 w2 w 45 ac ww a a 1 2 amb 2 meni 2036 1334 t m C O e lt 34 g Tal 26943 fag Ola 5 asp 1 8 ee oe pe Vez i ut 0 4 o 71 i1NO 00 7200 58011440 43 714 _ i A i 1 4
206. input voltage The time constant of this detector is approximately one second An analog multiplexer selects the desired detector signal and sends it to the voltage to frequency converter At this stage the dc level is converted into a frequency measured by the control circuitry associated with the microprocessor The displayed signal level is computed by the microprocessor according to the receiver impedance selected on the front panel Although the voltage to frequency con verter possesses excellent linearity it lacks absolute accuracy By measuring the voltage to frequency characteristics of the accurate 10 volt reference the required accuracy is obtained 8 100 Impulse Noise Detectors 8 01 Theimpulse noise detectors compare the full wave rectified signal from the detector circuitry with the preset high mid and low thresholds When the full wave rectified signal exceeds any preset threshold that threshold comparator sends a signal to the control and counting section impulse noise latches The preset thresholds are set as follows l The tens digit of all thresholds is set by scaling the input voltage by setting the proper autorange state 2 The ones digit of the low threshold is set by the impulse noise digital to analog convertor and the 10 volt reference o The mid and high thresholds are automatically set at 4 and 8 dB higher than the low threshold by a voltage divider Open collector comparators do the comparisons and send ind
207. irrelevant The following DC voltages should appear through 5 8 50 Model 4935A Service 3 Check inverter A3UIB Voltages at pin and pin 7 should be but of opposite sign 20 my if not replace A3UI Table 8 8 A2U1B Voltages ACCEPTABLE RANGE 0 762 0 794 1 207 1 257 1 914 1 992 The following table indicates the DC voltage TP3 HI cach dB of low threshold setting Table 8 9 TP3 Voltages THRESHOLD dB NOMINAL VOLTAGE ACCEPTABLE RANGE 2 144 2 232 2 412 2 510 2 679 2 789 3 024 3 148 3 407 3 547 3 790 3 944 4 249 4 423 4 785 4 981 5 360 5 578 4 Check comparators d Sct the IMPULSE NOISE LOW threshold to 90 dBrn Select the 1 5kHz filter Inject a signal of 2 0v at kHz into the receiver NOTE Transmitter will not work because its signal path is grounded in Impulse Noise using the 15 kHz filter b Monitor the output of the impulse noise comparators A3U2 pins 1 2 and 13 Each output should be squarewave with a voltage swing 5v to 14v Service 8 52 Modcl 4935 8 254 CHARGER BOARD TROUBLESHOOTING 8 255 Procedure 8 256 Check the AC supply at the A5 charger board Connect the 4935A to AC power source cycle the power switch from ON to STBY and check for the following voltages A5J1 pin 12 to 14 DC pin 2 2 23 5 to 29 5 vDC pin 3 29 5 to 23 5 H these voltages are
208. jack The receiver signal path is as follows Balanced input through input transformer Notch filter out 25 dB amp switched in when input signal is less than 5 mVRMS Autorange switched in Average detector selected l oop around path grounded 8 13 Noise 8 14 DISPLAY TRMT The transmitter provides quiet termination for the line The input to the power amp is grounded no output current through the transmit transformer The synthesis of the output waveform is stopped since the phase step latches are set to zero 8 15 DISPLAY RCV The receiver measures the level not frequency of the input to the front panel RCV jacks The receiver signal path is as follows Balanced input through input transformer Notch filter out 25 dB amp switched in when input signal is less than 5 mVRMS Autorange switched in Noise filter selected and displayed on front panel QRMS detector selected 8 16 Noise With Tone 8 17 DISPLAY TRMT The transmitter synthesizes a 1004 Hz signal set by the OUTPUT LEVEL control The wideband low pass filter is selected and the loop around path monitors the output of the power amplifier 8 18 DISPLAY RCV The receiver measures the level and frequency signal from the front panel RCV jack The level is measured with the 1004 Hz signal notched out Frequency measurements occur only when the 4935A is setup with DISPLAY RCV NOISE WITH TONE and LEVEL FREQUENCY modes The signal path is as follows Balanced input th
209. level per the telephone industry convention Figure 3 2 Measurements Continued Model 4935A Operation 4935A TRANSMISSION TEST SET OUTPUT CA HEWLETT PACKARD THRESH CNTS LEVEL wie kHz Cm COMIN OWE dBrn CNTNG POWER A A Tre Y Ee RCV TRMT 27 MEINER FREQUENCY n L LOW SET am NOISE a L 15 KHz FLAT O HIGH saa SIGNAL NOISE PROGRAM NON STOP IMPULSE 50 NOISE PERIOO DISPLAY 2 VOLUME NOISE TO 404 1004 3 GROUND 5 RESET FA STORE 2713 NOISE TRANSMITTER a Press DISPLAY TRMT RCV key to display the transmitted signal TRMT light will be b Press MEAS key to select NOISE There will be no values displayed because in this configuration the transmitter 15 turned off and a quiet termination is supplied to the TRMT jack NOISE RECEIVER a Press DISPLAY TRMT RCV key to display the received signal RCV light will be on b Press MEAS key to select NOISE Press FILTER key to select desired filter d Read the dBrn noise level in the left display A in the left display indicates underrange 0 dBrn Figure 3 2 Measurements Continued Model 4935 2 4935A TRANSMISSION TEST SET OUTPUT HEWLETT PACKARD THRESH CNTS LEVEL ON C dBm kHz
210. light A minus dB reading indicates levels higher than the reference level per the telephone industry convention STEP UP STEP DOWN lt and gt Keys In TRMT Mode right display and LEVEL FREQUENCY lt gt selects the position of digit to be increased or decreased Lighted cursor indicates one of five digit positions Digit value is incremented by pressing STEP UP and decremented by pressing STEP DOWN Holding the STEP UP or STEP DOWN key depressed causes the actions to repeat Figure 3 1 Front and Rear Panel Controls Connectors Indicators Continued 3 3 10 12 Model 4935A RCV Mode left display and IMPULSE NOISE gt selects the position of the threshold digit to be increased or decreased Lighted cursor indicates one of two digit positions Digit value is incremented by pressing STEP UP and decremented by pressing STEP DOWN THRESH LED dBrn and LOW SET LED will be on MEASUREMENT Section MEAS Key Selects measurement to be made Lighted LED indicates selected measurement For detailed measurement information of each mode see Figure 3 3 Measurement modes are LEVEL FREQUENCY Blue NOISE NOISE WITH TONE SIGNAL TO NOISE IMPULSE NOISE NOISE TO GROUND Standard units and option 001 P AR Options 002 003 FILTER Section FI I JTER STORE Key Selects desired weighting filter for Noise Measurements Selected wrighting filter will light
211. load from thc voltmeter cabling to J2 and J3 can be interchanged Check battery voltages at A5J2 5 3 and 5 4 d At A5J4 the 5 V supply should be greater than 6 The low voltage shutdown is 5 75 A5J2 and A5J3 the 14V supply voltages should be greater than 16V absolute valuc The low voltage shutdown is 15 06 If the battery voltages are low charge the batteries by connecting the 4935A to an AC power source Turn the power switch to STBY and let the unit charge overnight If battery voltages do not reach acceptable values after overnight charging and the the unit passes tests 4 above replace the batteries and repeat the charger board troubleshooting tests to verify fix Relay Drive Circuitry Low Voltage Inhibit Circuitry NOTE Batteries must be functional and fully charged for this test to work see paragraph 8 258 Disconnect the 4935A from AC power Cycle the power switch from STBY to ON If the 4935A comes go to paragraph 8 261 1f not continue Short A5C3 to disable low voltage inhibit circuitry Cycle power switch from STBY to ON If unit docs not start scc paragraph 8 263 below and troubleshoot the relay drive circuitry before continuing Service 8 54 8 261 8 262 8 263 8 264 Modcl 4935A Inhibit Circuitry AC And Low Voltage NOTE Batteries must be fully charged this test to be applicable sce paragraph 8 258 6 Turn
212. lt UP DOWN DIAL OO GROUND MEAS O TRMT RCV MEASUREMENT FILTER e RCV TRMT aaa C FREQUENCY C MESSAGE OLOW SET C NOISE She EAT NOISE 5 Es O WITH TONE 15 PLAT Exc cres D PROGRAM NON STOP L JTIMER a IMPULSE D MONITOR NOISE PERIOD F 15 r2 VOLUME NOISE TO 40 1004 ORE 4 FILTER Pe rE ST 2804 2713 SIGNAL TO NOISE TRANSMITTER a Press MEAS key to select SIGNAL TO NOISE b Press DISPLAY TRMT RCV key to display the transmitted signal TRMT light will be on Turn OUTPUT LEVEL knob to adjust 1004 Hz signal to data level usually 13 dB below the transmission level point SIGNAL TO NOISE RECEIVER Press MEAS key to select SIGNAL NOISE b Press DISPLAY key to display the received signal RCV light will be on C Read the Signal to Noise ratio as dB in the right display The received level is displayed in the left display Note Err 7 indicates the received 1004 Hz tone has dropped below 46 dBm or exceeded 13 dBm Figure 3 2 Measurements Continued 3 11 Model 4935A Operation 4935A TRANS S T SET HEWLETT ARF THRESH eveL ON a C dBm i kHz DISPLAY Hz STBY A C MIN L x zi 0 dBrn A A A A A CNTNG NOR LEVEL STEP STEP
213. of 4935A refer to the Diagnostic Service Kit HP 04935 60014 for most of the troubleshooting procedures 8 196 Transmit Clock Generator 8 197 The transmit clock generator provides the proper clock frequency to the phase address generator waveform ROM and ROM latches It also provides 262 kHz signal to the microprocessor and counting block where it is used internally when measuring frequency In the standard 4935A only the sine clock circuitry is provided so wire jumper JW4 shoud be installed CAUTION JW4 should not be installed if U39 is loaded If U39 were loaded two outputs U23 pin 10 U39 pin 11 would drive the same line 8 198 In the P AR model opts 002 and 003 sine and P AR clocks are provided Multiplexer U39 selects the proper clock according to the state of the P AR SINE select signal from U26 pin 1 low sine clock selected When the sine clock is selected the following frequencies should appear CHIP PIN FREQUENCY Low U23 4 194 MHz U32 1 049 MHz U32 262 1 kHz 8 199 When the P AR clock is selected the following IC pins should toggle at the frequencies indicated CHIP PIN FREQUENCY U39 High U23 6 144 MHz U31 512 kHz U32 128 kHz U32 32 kHz 8 200 TRANSMITTER SIGNATURE ANALYSIS PROCEDURE 8 201 The transmit signature analysis procedure is used to check the digital components in the transmit section from the adders phase address generator to the digital inputs to the digital to analog conv
214. other frequencies set the desired frequency in the transmitted frequency display press the STORE key and press whichever location key F1 F2 F3 or F4 that is desired as the storage location Figure 3 2 Measurements Continued 3 7 Operation Model 4935A J 49354 TRANSMISSION TEST SET _ OUTPUT P HEWLETT PACKARD THRESH CNTS LEVEL Rae JdBm kHz DISPLAY susce Hz C STBY MIN A dBrn A A A A LJCNTNG t um TRMI RCV FILTER dI m p C MESSAGE J Low SET NOISE 3 KHz FLAT C MID AEN 15 KHz FLAT O60 MIN J HIGH aa A SIGNAL a NOISE PROGRAM NON STOP TIMER IMPULSE DIAL NOISE 404 1004 GROUND e OO LEVEL AND FREQUENCY RECEIVER a Use MEAS key to select LEVEL FREQUENCY b Press DISPLAY key to display the received signal The RCV light will come ON Read RCV level in the left display A t sign indicates received signal is gt 1 3 dBm A sign indicates received level is lt 78 dBm 4 LEVEL ZERO For attenuation distortion measurements press LEVEL ZERO key to set the received level at 0 dB All subsequent level measurements will be made relative to this point Pressing the LEVEL ZERO key a second time reverts the level to absolute units dBm instead of relative units dB A negative reading indicates levels higher than the reference
215. rz 5 0 ezo a 9 4 en 3 3 i g 2 ser 196 25 i S 3 t3 ogo L i E 54 655 42 442 i 2 3 een t3 esu 12 8 2 CM 3 ocn c3 19 9 12 MS enr 93 8 8 2 ES gir ezn 2 2 556 52 Do Li oj aug 22 9 6 3 125 2 3 22 5 3 2 3 6 5 3 sen 5 8 0 2 Por Eri 2 8 62 ES 3 Bin 8 a 5 0 v3 grt 5 j 120 1 3 iv gv 442 L3 95 c a 52 1 ein rve py 92 1 i 3 by 0 sin US iN i UE te vg sin tO 512 o lt lt 9 M DE P 6 6 6 AJY sese MIENNE M 202207 8 2 1 vy ambia 8 0 9 5 0 9 9012 55209 65658 CS aALLINSNAANL ro cin ra ecu L6 5015 zn 5 2 1 5 9cu 2 1 oin Sty eo 2012 1 2 6n 10 2 2 5 en 0012 r2 4n 9n 9 0 guo eo sn 83 150 2 9 3 962 1 9 en 2
216. see Level and Frequency Range 6008 and 900 2 10 100 dBrn BCCULACY s cue RR Owes 1 dB from 20 to 100 dBrn Signal to Noise Ratio Frequency 1004 Hz fixed tone For other specifications see Level and Frequency 3 Level Impulse Noise Frequency 1004 Hz fixed tone or quiet terminated depending on filter selection For other specifications see Level and Frequency Noise to Ground Transmitter is quiet terminated P AR Optional Frequency Signal spectrum is a complex pulse train of 16 frequencies between 140 Hz and 3890 Hz Level Range 40 to 0 dBm Resolution 1 dB 2 dB from 10 to 20 dBrn For other specifications refer to Message Circuit Noise Signal to Noise Ratio Signal Level Range 40 to 13 dBm Ratio Range IO to 45 dB Resolution 22025552 uoto ad RAE RE 1 3 Level Impulse Noise Level Range 40 to 13 dBm Notch Noise with Tone Threshold Ranges 6000 LOW 30 to 109 dBrn Mid 4 dB above Low to a maximum of 109 dBrn High 8 dB above Low to a maximum of 109 dBrn Loss of Holding Tone Indication Minus sign Threshold Accuracy above 40 Brn 108 5 15 60 min or non stop Count Range O 9999 for ea
217. senuryy P O A4 TRANSMITTER BOARD 04935 60303 14 TRANSMITTER ASSY WITH P AR 04935 60307 REV 23 TM jon i p DIGITAL ANAL 1 C47 x CONVERTER V 07 NC 16 Em IRL m T e z 1 qusB ar 15 i 12 2 115 06 15 52 52 7 y NAE 3 933 SS 12 o Q4 pee Tcl 13 2 22 2 9 TOES 2 24 ek v 10 i 4 dice peas 5 ee QI e pS ee CUP aaa QO D dic Es 5 4 9 4 B 5 1490 049 U49F U498 U49C 4 In Ss gt NC gt gt NC dee zi 72 V V V 2110 0065 2110 0296 AC LINE VOLT 100 120 FUSE 375 AT5MA 200 TOOMA NOTE FUSES APE NON TIME AY TYPES i m mv na o 4 AC HOT GNP ji COM a Li WT BL R erat CHASSIS 1 RI pol X mucus 5 60307 REV C 2314A _ M a Ft _ L L Q I t E lt v
218. shots limit the count rate to 8 per second Edge triggered latches hold the count for the microprocessor The microprocessor reads the latches through I O port 5 and resets them through I O port 4 8 70 MISCELLANEOUS ANALOG The Schmitt trigger circuit squares the incoming signal during frequency measurements Schmitt trigger hysteresis 1s required for good noise rejection The amount of hysteresis 1s proportional to the average detector output to provide wider hysteresis for larger signals 8 71 SQUARING AND DROPOUT The 1004 Hz tone dropout and squaring circuitry measures the 1004 Hz frequency tone in noise with tone signal to noise or impulse noise measurements and detects drops in the tone signal below 46 dB The notch filter removes the 1004 Hz tone before autoranging the tone signal 1s intercepted before the notch filter and amplified through a bandpass filter before being routed to the transmitter board 8 72 To measure the hold tone of 1004 Hz in noise with tone a squared 1004 Hz waveform is selected by the microprocessor The microprocessor determines if the hold tone is present and above 46 2 dBm as follows The microprocessor sets dropout latch through frequency measurement and control latch 2 The microprocessor waits for a short time Service Model 4935A DEr VIC UN TUN a GEX ONY 431313 55 gt gt gt 5 5 5
219. shown in Figure 4 2 2 Setup the 4935A as follows POWER ON DISPLAY TRMT NOR press in SET UP press in TRMT 600 BRG out DIAL out both HOLDS out MEASUREMENT LEVEL FREQUENCY 3 Set the 4935A 10042 4 Adjust the OUTPUT LEVEL until 775V 0 dBm appears the Voltmeter 5 Check the 4935A transmitter at the frequcncics given in Table 4 3 Table 4 3 Abbreviated Transmitter Flatness VOLTAGES VRMS 20 Hz 200 Hz 15 kHz 85 kHz 110 kHz Performance Tests 4 7 Performance Tests Model 4935A PERFORMANCE TESTS 4 15 RECEIVER ACCURACY at 11 dBm and 40 dBm SETUP COUNTER A Ow CALIBRATOR O Q O BNC T Figure 4 3 Receiver Test at 11 dBm and 40 dBm EQUIPMENT Fluke 5200A AC Calibrator 3 BNC cables 53 15 Frequency Counter 2 BNC to banana cables 310to BNC adapter 1 banana plug cable Connect the AC Calibrator to 4935A RCV jack as shown in Figure 4 4 2 Setup the 4935A as follows POWER ON DISPLAY 4 enh Be te ee RCV REV SET UP press in RCV 6000 press in BRG MEASUREMENT LEVEL FREQUENCY RECEIVER ACCURACY AT 11 dBm 1 Set AC Calibrator output to 2 733 V 410 95 dBm into 600 ohms the0 05 dB offsetchecksfor round off errors in the 49354 2 The 4935A level and frequency displays should be within the limits shown in Table 4 3 RECEIVER ACCURACY AT 40 dBm
220. the battery voltages drop below 15V and or 5 75 the relay will switch to AC linc power effectively shutting the instrument off Plugging in the instrument automatically selects the ac line power independent of the power switch setting 8 146 Relay Drive Circuitry 8 147 The relay drive circuitry controls the operation of the relay Figure 8 36 Q2 energizes the relay when the battery option is selected In this state Q3 R2 CR2 and R4 form fecdback loop keeping Q2 latehed The power switch input provides a transient to latch Q2 R5 This transient is the transition switeh between 5 battery and ground When the power switch is on the latch latches Turn the power switch off the feedback loop is broken and Q2 is turned off The only input to the drive circuit is the inhibit signal through Q4 that turns Q2 off and then turns on transient 8 148 Inhibit Circuit 8 149 When thc instrument is connected to linc voltage or if any battery voltage drops too low the inhibit signal is activated 8 150 To check the battery voltages the 3 unregulated voltages are compared to reference voltages with open collector comparators In battery mode these unregulated voltages will be battery voltages The reference vollages are generated from the 14V regulated supplies 8 26 Modcl 4935 Service 8 151 Any of the comparators tripping will turn on the inhibit transistor Q5 Note that if the 15V ac line voltage is present Q5 will b
221. the counts display indicates that the tone has dropped below 46 dBm for more than sec during the test Tone dropout could cause invalid count totals Figure 3 2 Measurements Continued 3 13 Operation Model 4935A 4935A TRANSMISSION TEST SET OUTPUT HEWLETT PACKARD LICNTS LEVEL ON gt x dBm kHz DISPLAY dB D He STRY POWER 1 A dBrn A A A A A NOR REV SF LEVEL STEP STEP M ZERO UP DOWN MEASUREMENT FILTER IMPULSE NOISE me RCV TRMT ne LEVE FREQUENCY MESSAGE MIN JLOW SET NOISE 3 KHz FLAT 115 MIN Li MID Gumi Miu x a WITH 15 KHz FLAT 50 MIN C HIGH E SIGNAL NOISE PROGRAM STOP 2 IMPULSE NOISE 50 KBIT MONITOR PERIOO F1 DISPLAY F2 VOLUME 404 1004 SENT 2804 2713 NOISE TO GROUND TRANSMITTER STANDARD UNIT and Option 001 O a Press DISPLAY TRMT RCV key to display the transmitted signal TRMT light will on b Press MEAS key to select NOISE TO GROUND which provides a quiet termination to the TRMT jack NOISE TO GROUND RECEIVER STANDARD UNIT and Option 001 For valid NOISE TO GROUND measurements the test set must be properly grounded Connect the rear panel chassis ground post to a known good ground a Press DISPLAY TRMT RC
222. through the C message filter the resultant signal is applied to the line monitor speaker The 4935A operator listens for any predomina nt tone which may indicate a single frequency interference problem A1 single frequency tone or tones of long duration is heard single frequency interference may be present and should be measured To determine the frequency and level of the interfering tone a frequency selective volt meter or spectrum analyzer must be used Single frequency interference during a C message filter measurement occurs if the signal is 3 dB or less below C message noise limits 3 52 IMPULSE NOISE 5 90 The S level Impulse Noise Mode measures one of most important transient phenomena Transient phenomena can cause data transmission errors and or interruptions to datacom systems 9 94 Impulse noise is that component of received noise signal which is much greater in amplitude than the normal peaks of the message circuit noise It occurs as short duration spikes and or bursts of energv Studies by Hell Telephone laboratories have shown that impulse noise spikes have a duration of less than one millisecond and that all significant effects of the noise spike disappear within four milliseconds Waveform b in Figure 83 illustrates a received holding tone or test signal that includes interfering impulse noise spikes The impulse noise measurement counts the number of noise spikes above a selected threshold leve d
223. up 4935A as follows POWER re e doe RCV MEASUREMENT LEVEL FREQUENCY OUTPUT DEVEL i x9 m edet adjust to 0 0 dBm Performance Tests PERFORMANCE TESTS 6 Repeat the following test three times The procedure and expected result remain the same termination impedances selected and the value of the resistor placed across the RCV jack will change First use 9000 resistor second a 6000 and finally 1350 resistor Select equal TRMT RCV termination impedances 9000 6000 or 1 3500 h The display should read 0 0 dBm C Press in the button 1 The display should read 61 dBm 1 dBm u Connect the first resistor externally across the right jack If the TRMT and RCV resistance buttons pressed are 9000 the resistor chosen should he 9000 f The display shouftf read 0 0 dBm dBm p Release the button and remove the resistor h Return to step a and select the next resistor ABBREVIATED TERMINATION IMPEDANCE TEST 1 Setup the 4935 as follows POWER DISPLAY 200 ws REV TOU press in simultaneously SET UP M ee sss press in both 6000 buttons MEASUREMENT 8 be LEVEL OU JTPUT LEVEL 2 adjust to 00 dBm 2 Press in the button The display should read 61
224. wv 82 fa v t 658 2 91 ven 3 59 OD 68 32 23 52 3 gn z 2 oen 2 5 22 aud 2 o 23 25 675 OLD ay 279200 527987 phm 7616 918530 207 207 GID ame 1 1 1 pLy pue 6 8 9 5 t t 2 s upuj enue s P O A4 TRANSMITTER BOARD 04938 60303 AND 14 TRANSMITTER ASSY w 4 80 ASSY 77 T N 5 INTERRUPT s Orid CS n aor see ecd l A2 3 J3 r TR EIN 5 11 e5 3e a __ _ I s gt 5 p pad aur Bi N 5 E i I 2 SHEER 5 DISPLAY j cant 2 IMPULSE NOISE LATCHES ___ o O O i gt 15 STEP FILTER STOP T R STORE F4 11 1 i LEFT LEVEL START 1 i ARROW ZERO I 9 LJ RIGHT PERIOD ARROW Fi Lo O 1 1 9 Du Sa
225. 0 Distortion in dB from fundamental Includes harmonics spurious and background noise within a filter with a 3 dB bandwidth of 4 kHz or 4 10 whichever is greater Receiver accuracy not specified below 500 Hz when using 13562 termination At 1004 kHz accuracy is 01 dB from 20 to 13 dBm FREQUENCY Hz Cross talk gt 78 dB isolation 4 kHz decreasing 6 dB per EA octave above 4 kHz 5 ag 5 49 41 At 1004 Hz dBm THD using a 4 kHz filter is more than 65 dB down from the fundamental Message Circuit Noise Message Circuit Noise Transmitter is quiet terminated Range 60082 9002 O to 100 dBrn 13516 lower limit is 7 dB higher RHesol ullOn ic ke ose Been 1 dB 1 dB from 10 to 100 dBrn 2 dB from 0 to 10 dBrn Fiters C Message 3 kHz Flat 15 kHz Flat Program 50 kBit Specifications describe the instrument s warranted performance Supplemental characteristics shown in shaded areas or in italics are intended to provide information useful in applying the instrument by giving typical but non warranted performance parameters 1 2 Model 4935A General Information Table Specifications Continued TRANSMITTER RECEIVER Noise with Tone Noise with Tone Frequency 1004 Hz fixed tone Notch Filter gt 50 dB rejection from 995 to 1025 Hz For other specifications
226. 0 Mfr P N 04935 60207 Page 6 33 Table 6 3 Replaceable Parts Continued Delete A14R97 0757 0442 RESISTOR 10K 1 125W CD 9 Mfr Code 24546 Mfr P N C4 1 4 TO 1002 F Delete A14R98 0757 0278 RESISTOR 1 78K 1 125W CD 9 Mfr Code 02273 Mfr P N CEA 993 Delete 14 99 0698 3157 RESISTOR 19 6K 1 125W CD 0 Mfr Code 02273 Mfr P N CEA 993 Delete 14 100 0757 0428 RESISTOR 1 62K 1 125W CD 7 Mfr Code 02995 Mfr P N MF4C 1 Change A14R80 to 0757 0420 RESISTOR 7509K 1 125W CD 3 Mfr Code 24546 Mfr P N C4 1 8 TO 751 F Change 14 81 to 0757 0290 RESISTOR 6 19K 1 125W CD 5 Mfr Code 19701 Mfr P N 4 1 8 1626 7 7 Manual Changes Model 4935 CHANGE 8 Page 6 34 Table 6 3 Replaceable Parts Continued Delete A14U53 1826 0735 IC AMP H SLEW RATE 8 DIP P PKG CD 1 Mfr Code 34371 Mfr P N HA3 2507 5 Page 6 35 Table 6 3 Replaceable Parts Continued Change 2200 0704 to 2200 0107 SCREW MACH 4 40 37 LG PAN HD POZI CD 6 Mfr Code 0000 Mfr P N order by description Page 8 72 Figure 8 31 A4 Transmitter Board Component Locator Replace with component locator shown in Figure 7 16 Page 8 73 Figure 8 32 Al4 Transmitter Board Component Locator Replace with component locator shown in Figure 7 17 Page 8 75 Figure 8 34 A4 Transmitter Board Schematic Diagram Sheet 2 of 2 Replace with partial schematics shown in Figures 7 18 and 7 19 CHANGE 9 With
227. 0 7 2 CAPACITOR FXD 39PF 5 300VDC MICA 72136 DM15E390J0300WV1CR A13C25 0160 0576 5 CAPACITOR FXD 1UF 4 209 50VDC CER 28480 0160 0576 A13C26 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C27 0160 6405 1 CAPACITOR FXD 01UF 4 196 100VDC MICA 08113 HP204751PF3C1 13 28 0180 0374 3 11 CAPACITOR FXD 10UF 10 20VDC 56289 150D106X9020B2 A13C29 0180 0374 3 CAPACITOR FXD 100 1096 20VDC TA 56289 150D106X902082 13 31 0160 0576 5 1UF 20 50VDC CER 28480 0160 0576 A13C32 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C33 0160 0576 5 CAPACITOR FXD 1UF 4 209 50VDC CER 28480 0160 0576 A13C34 0180 0374 3 CAPACITOR FXD 10UF 10 20VDC TA 56289 150D106X9020B2 A13C35 0180 0374 3 CAPACITOR FXD 100 10 20VDC 56289 1500106 902082 13 36 0180 0374 3 CAPACITOR FXD 10UF 10 20VDC TA 56269 150D106X9020B2 A13637 0160 0576 5 CAPACITOR FXD 1UF 20 CER 28480 0160 0576 13038 0140 0190 7 39PF 5 300VDC MICA 72136 DM15E390J0300WV1CR 13 41 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 13 42 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C43 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C44 0180 0374 3 CAPACITOR FXD 10UF 10 20VDC 56289 150D106X9020B2 A13C45 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C46 0180 0374 3 CAPACITOR FXD 10UF 10 20VDC 56289 150D106X90
228. 0 C4 1 8 TO 751 F A3R37 0698 4480 7 RESISTOR 15 8K 1 125W TC 0 100 C4 1 582 F A3R38 0757 0424 7 RRESISTOR 1 1K 1 125W TC 0 100 C4 1 B FO 11 8 TO 1 i A3R39 0698 3 150 5 RESISTOR 2 37K 1 125W TC 0 100 4 1 amp TO 2371 F A3R40 0757 6360 6 RESISTOR 10K 196 125WF TC 0 100 C4 1 8 TO 1002 F A3R42 0757 6360 6 RESISTOR 10K 1 125W F TC 0 100 4 1 8 0 1002 A3R43 0757 0420 6 RESISTOR 750K 1 125W F TC 0 100 C4 1 8 TO 751 F A3R44 0898 4480 7 RESISTOR 15 8K 1 125W F 0 100 C4 1 8 T0 1582 F 45 98 4480 7 RESISTOR 1 56 1 125W TC 0 100 4 1 8 T0 1582 F A3R46 0698 3155 4 RESISTOR 4 64 1 125W TC 0 100 4 1 8 4641 Model 4935A See introduction to this section for ordering information Indicates factory selected value 6 14 Model 4935A A d ence A3R114 A3R115 A3R116 A3R117 A3R118 A3R119 A3R120 A3R121 gnator P Part umber 0698 4475 0698 7847 0698 6360 0757 0159 0698 0083 0757 0864 0757 0864 0698 3453 0757 0401 0757 0438 0698 3155 0757 0199 0698 6360 0757 0317 0757 0317 0757 0442 2100 3882 07570442 0698 3157 0757 0444 0757 0199 07 0757 04 0757 0280 0698 3150 0698 3150 0757 0274 0698 0084 2100 3881 0757 0465 0698 4530 0699 0595 0699 1078 0698 4516 0698 4158 0698 6360 0698 4158 0698 4490 0698 4490 0699 0566 0699 0566 0757 0280 0698 7847 0698 6445 0698 8638 0797 0289 0699 0589 0699 0589 0698
229. 0160 6320 CAPACITOR FXD 1700PF 1 100VDC MICA HP204751PF3C1 A13C88 0160 0576 1UF 20 CER 0160 0576 A13C89 0160 6405 CAPACITOR FXD O1UF 1 100VDC MICA HP204751PF3C1 A13C90 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 13 91 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A13C92 0160 6405 CAPACITOR FXD O1UF 1 100VDC MICA HP204751PF3C1 13C93 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 13 94 0160 0576 CAPACITOR FXD 1UF 20 50VDC 0160 0576 A13C95 0140 0177 CAPACTOR FXD 400PF 1 300VDC MICA DM15F401F0300WV1CR A13C97 0160 6317 CPACITOR FXD 4751PF 4 196 300VDC MICA HP204751PF3C1 13 98 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A13C99 0180 0374 CAPACITOR FXD 10UF 10 20VDC 150D106X9020B2 A13C100 0160 6405 CAPACITOR FXD 01UF 1 100VDC MICA HP204751P3C1 A13C101 0160 6405 CAPACITR FXD 01UF 1 100VDC MICA HP204751PF3C1 A13C102 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A13C103 0160 3291 ACPACITOR FXD 1200PF 1 100VDC MICA 0160 3291 A13C104 0160 0218 CAPACITOR FXD 2400PF 4 196 300VDC MICA 0160 0218 A13C105 0160 0576 CAPACITOR FXD 1UF 2090 CER 0160 0576 A13C106 0160 0576 CAPACITOR FXD 1UF 2090 50VDC CER 0160 0576 A13C107 0160 3291 CAPACITOR FXD 1200PF 1 100VDC MICA 0160 3291 A13C108 0160 0218 CAPACITOR FXD 2400 1 300VDC 0160 0218 13 109 0160 0576 1UF 20 50VDC CER 0160 0
230. 0442 RESISTOR 1 Add A3R176 HP Part No 0698 8638 RESISTOR 3 16 1 Add A3R177 HP Part No 0698 6445 RESISTOR 6 838K 1 Change A3R129 to HP Part No 0698 6362 RESISTOR 1 Change 146 to HP Part 0698 6446 RESISTOR 2 162K 190 Change A3R147 to HP Part No 0698 6445 RESISTOR 6 838K 1 Change A8TP2 7 to HP Part No 0360 0124 TEST PIN Change ASTP9 15 to HP Part No 0360 0124 TEST PIN Page 6 16 Table 6 3 Replacement Parts Receiver Board Add A3U49 HP Part No 1826 0735 IC HA 2507 5 Page 6 24 Table 6 3 Replacement Parts Receiver Board Change A13C60 to HP Part 0160 3291 CAPACITOR 1200 pF 1 Change AL3C71 to HP Part No 0160 5257 CAPACITOR 1100 pF 1 Page 6 25 Table 6 3 Replacement Parts A13 Receiver Board Add 13 128 HP Part No 0160 0576 CAPACITOR 1 10 Add A13C129 HP Part No 0180 0374 CAPACITOR 10 1075 Add A13C130 HP Part No 0180 0374 CAPACITOR 10 aF 10 Add A13 138 Part No 0160 0576 CAPACITOR 1 10 Delete 13 160 hand selected capacitor Page 6 26 Table 6 3 Replacement Parts A13 Receiver Board Add AI3CRIS8 HP Part No 1901 0376 DIODE GEN Add AL3CRI9 HP Part No 1901 0376 DIODE GEN Add A13CR20 HP Part No 1901 0376 DIODE GEN Add AT3CR21 HP Part No 1901 0376 DIODE GEN Add AT3CR22 Part No 1901 0376 DIODE GEN Add A13CR23 HP Part No 1901 0376 DIODE GEN Add AL3CR24 HP Part No 1901
231. 0465 0757 0280 2100 3881 0757 0438 0757 0438 0757 0442 0757 0458 0698 3156 0698 3152 0757 0458 0757 0442 0698 3160 0757 0442 0698 3160 0757 0280 0757 0458 0698 3451 0757 0442 0757 0442 0698 3160 0698 3160 0757 0442 0698 3160 0757 0421 0757 0442 0757 0443 0757 0441 0757 0419 0757 0422 0757 0442 2100 3881 0757 0279 2100 3882 0757 0422 0757 0442 0757 0442 0757 0180 0757 0180 0757 0428 0757 0431 0698 0084 0698 6393 0757 0279 0638 8827 0757 0442 0757 0394 0757 0442 0698 3150 0757 0280 0698 3157 0757 0428 Table 6 3 Replaceable Parts Continued Description RESISTOR 9 09 1 125W 0 100 RESISTOR 750 1 125W 0 100 RESISTOR 750 1 125W 0 100 RESISTOR 1 96 1 125W 0 100 RESISTOR 100K 1 125W 0 100 NETWORK RES 8 SIP 22 0K OHM X 7 RESISTOR 100K 1 125W F TC 0 100 RESISTOR TRMR 2K 10 C TOP ADJ 17 TRN RESISTOR 511 1 125W 0 100 RESISTOR 1 96K 1 125W F TC 0 100 RESISTOR 10K 1 125W 0 100 RESISTORS 51 5 1 125W F 0 100 RESISTOR 1 33K 1 125W 0 100 RESISTOR 750 1 125W TC 0 100 RESISTOR 750 1 125W F TC 0 100 RESISTOR 100K 1 125W 0 100 RESISTOR 1K 1 125W F TC 0 100 RESISTOR TRMR 500 10 C TOP ADJ 17 TRN RESISTOR 5 11K 1 125W TC 0 100 RESISTOR 5 11K 1 125W 0 100 CO QJ 74 lt gt RESISTOR 10K 1 t25W 0 100 RESISTOR 51 1K 1 125W
232. 1 4 103607 Ed R i ME 1 9 i Lil s 39u 2 2 i 2 s zi s zi lt z zij 5 amp 4 Cm 9 8 1 1 4 a 61 i 5 sl le ej 9 s 6 9 5 ate d l 0 4 M cis q IH Y m J g 11 19 ii 3 9 sii n z 1 A i z eid 21 5 C eH Nized n jz Segen aus 9 ns 3 i 4 ie vd 2 b t 4 EE node Wn je z gt am gt THREE Q s m Q Q a aP h 19 m MF 34 INS i 2 2 21 j j s 1 gt zef i 4 1 3 3 aj 2 931 z 3 9 13 P 5 Seno oi 2 5 sak ay 14 x 2 uj po 19 1 21 zu zi Ie 2 i 5 S 1 vif i i 1 wh I p i Pl RUP z it N Q gt rit al eti si 2 TS IT a is 930907 n ees E 1 4 58 41 24i i amp 2u 75 5 I JOWNY Am u 301 33H 201 201 91530 338 diu OL 6 8 Z 9 S b 2 1
233. 1 A3R9 0698 0084 RESISTOR 2 15K 1 125W TC 0 100 4 1 8 0 2151 RESISTOR 2 15K 1 125W TC 0 100 1 8 0_ 5 AM Nr Ue RESISTOR 30 1K 1 125W TC 0 100 a 0757 0453 4 1 8 0 3012 A3R15 1810 0281 NETWORK RES 10 SIP100 0OK OHM X 9 210A104 A3R16 0757 0442 RESISTOR 10K 1 125W 0 100 V4 1 8 T0 1002 F A3R17 0757 0442 RESISTOR 10K 1 125W TC 0 100 V4 1 8 T0 1002 F A T RESISTOR 10K 1 125W 0 100 1 8 TO _ 43110 Wine RESISTOR 316K 1 125W 0 100 0699 3457 M A3R20 1810 0281 NETWORK RES 10 SIP100 0K OHM 9 210A104 A3R21 1810 0369 NEWTOWRK RES 6 SIP100 0K OHM X 5 750 61 R100K A3R22 0698 6360 RESISTOR 10K 190 125W 0 25 0698 6360 A 2100 3981 RESISTOR TRMR 2K 10 C TOP ADJ 17 Hus RESISTOR 3 48K 1 125W 0 100 1 8 10 3MB F A3R27 0698 3153 RESISTOR 3 83K 1 125W F 0 100 4 1 8 10 3831 A3R28 0757 6360 RESISTOR 10K 1 125W TC 0 100 4 1 8 0 1002 A3R29 0698 6320 RESISTOR 5 1 125W 0 100 C4 1 8 T0 5001 F A3R30 0757 RESISTOR 511 1 125W TC 0 100 1 8 2 DIE RESISTOR 511 196 125W TC 0 100 2100 3883 RESISTOR TRMR 5K 10 TOP ADJ 17 TRN 2100 3883 A3R34 0757 0442 RESISTOR 1 125W F TC 0 100 4 1 8 10 1002 A3R35 0757 0420 RESISTOR 750 1 125W 0 100 C4 1 8 T0 751 F A3R36 0 RESISTOR 15 8K 1 125W F 0 100 A3R37 noe Tino RESISTOR 15 8K 1 1
234. 1 Figure 6 3 Exploded View Battery Option 7 Replaceable Parts SAA P eeN Ewe Re LA 4 OFF OAS 6 7 Replaceable Parts 0000 01121 nic 019 12111 03568 X508 04713 0524 062382 067 n 11226 17856 183224 19701 0435 7 045445 CUDSS 27014 3480 12 293 44x37 8289 AM Xf uan Table 6 2 Manufacturer Code List MANUFACTURER NAME ANY SATISFACTORY SUPPLIER ALLEN BRADLEY TEXAS 19576 INC SEMICOND CMPNT DIU RCA CORP SOLID STATE DIV SPEC TROL ELECTRONICS CORP E CO SEMICONDUCTOR PROD DE PT KDI PYROF CORP MOTOROLA SEMICONDUETOR PRODUCTS CORCOM INC PANDUT f CORP ASHLAND PRODUCTS Cl 5 OF RI LCONTX INC GNE SE CS CORP MI PRO TLEC TRA CORP ANAL OG DEVICES INE CORNING GLASS WORKS CERADFORD SIEMENS CORP NATIONAL SEMICONDUCTOR CORP HEWLETT PACKARD CO CORPORATE HQ INTERSIL ING HARRIS MICON DIM HARRIS INTI SYNE SPRAGUE ELECTRIC ELECTRO MOTIVE CORP SUR TEC TRW TNC PHILADELPHIA DTV LOTTE USE TNC BURR BROWN ADDRESS MIL WALK EF DALLAS GOMERY ELLE CITY END GYRACHSE WHIP PANY PHOENIX CHICAGO TINLEY PARK CHICAGO SANTA CLARA SUNNYVALE MINERAL WELLS NORWOUD ORD ISELIN SANTA CLARA PALO ALTO CUPER TING HOUR NE SANTA CLARA NORTH ADAMS WILLIMANTIC PHILADELPHIA DES PI AINES HUNTGUILLE ZIP CODE 732
235. 1 6947 1251 6947 0 CONNECTR SGL CONT PIN 025 iN BSC SZ SQ 251 6947 A3TP9 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 146 1251 6947 See introduction to this section for ordering information 7 51 Manual Changes Reference Designator A3TP10 A3TP11 A3TP12 A3TP13 A3TP14 15 A3TP21 A3TP22 A3TP23 24 A3TP25 A3U1 A3U2 A3U3 A3U4 A3U6 A3U7 A3U8 A3U11 A3U12 A3U13 A3U14 A3U15 A3U16 A3U17 A3U20 3021 A3U22 A3U23 A3U24 A3U25 A3U26 A3U27 A3U28 A3U28 A3U30 A3U3 1 A3U32 A3U33 A3U34 A3U35 A3U36 A3U37 A3U38 A31 39 A3U40 A3U42 043 A3U44 A3UA5 A3U46 A3U47 A3LIAB A3U50 A3U51 A3US2 A3U55 56 7 A3UXB 17 1826 0712 1826 0138 1826 0624 1826 1071 1826 0742 1826 0639 1820 1956 1820 1958 1820 1956 1820 2326 1920 1315 1826 1544 1826 0667 1826 0712 1820 1956 1826 1071 1826 0735 1826 0735 1826 0735 1826 0735 1826 0735 1826 0208 1826 0740 1826 0208 1826 1544 1826 0735 1826 0665 1826 0712 1826 0208 1826 0740 1826 0740 1826 0665 1820 1725 1820 1735 1820 1726 1826 0753 1826 0736 1826 0667 1826 0667 1826 0667 1826 0712 1826 1422 1826 1544 1826 0740 1826 0753 1826 1544 1826 0735 1826 0667 1200 0473 1200 0473 1200 0473 2260 0002 2260 0009 8120 0456 0380 1157 CO CD gt Table 6 3 Replaceable Parts Continued Description CONNECTR
236. 10 seconds The voltage across C3 should be approximately 0 volts no more than 5 volts d If either of these tests fail check Q4 Q5 CR4 CR1 R7 R8 R10 and C3 If necessary go to the relay drive troubleshooting paragraph 8 263 If all tests pass then the ac and low voltage inhibit circuitry is working SERVICE AIDS SERVICE SELECTION OF INPUT NOTCH FILTER 25 dB AMP The input source selects balanced input transformer vs loop around from transmitter vs noise to ground whether the notch filter is selected or whether the 25 dB amp is selected can be set by hand for servicing 8 270 Procedure CAUTION U7 is static sensitive Remove U7 from its socket and place it in protective carbon foam Install DIP switch in JU3 Select desired conditions using following tables D0 Balanced input noise to ground select Switch open logic 1 Balanced input from transformer Switch closed logic 0 noise to ground input D1 Front panel input transmit monitor loop around switch Switch open logic 1 front panel Input balanced input or noise to ground input Switch closed logic 0 transmit monitor loop around D2 notch filter in out select Switch open logic 1 notch filter in Switch closed logic 0 Notch filter out D3 25 dB Amplifier in out Switch open logic 1 Amp in Switch closed logic 0 Amp out Remove DIP switch Replace U7 in its socket observe CAUTION of Step 1 8 57
237. 10 TO BNC BNC TO DUAL BANANA ADAPTER Figure 4 15 Noise to Ground Test EQUIPMENT Fluke 5200A AC Calibrator 1 shorting strap 310 to BNC adapter 2 banana cables banana to BNC connector female Connect equipment as shown in Figure 4 15 On 4935A select POWER 2 65 ON RCV MEASUREMENT O I S E TO GROUND SL a aac epee ee E press in both 600 buttons BRG in 2 Connect AC Calibrator low ground lug on 4935 rear panel Short 4935A input lip and ring and connect t the Calibrator HIGH 4 Set AC Calibrator output to 7746 Vrms at 1000 Hz 4935A display should typically read 90dBrn 2dBrn ABBREVIATED NOISE GROUND TEST There is Abbreviated Noise to Ground Test 4 26 4935 Performance Tests Performance Test Record 4935A S N gt SHR DATE RESULTS DESCRIPTION Self Check 71 Transmrtter Flatness at 10 dBm D Transmrtter Flatness at 40 dBm MM Receiver Accuracy at 12 dBm and 40 dBm Autorange Filter Tests impulse Norse DAC Count Limit Test Termination Impedance Test r Hold Tone Dropout Detector Test F l P AR Test Options 002 and 003 only Norse To Ground Test Standard Unit Only 1 po Distortion Test Longitutal Balance Setup nee coo ohms PH 4 EIM 295 hear Pane sound Lua 5 E C JUT Specs
238. 1020 1956 IC QUAD LCH CMOS COM CLOCK 01928 CD4042BE A14U031 1820 1420 IC CNTR TTL LS DIV BY 12 ASYNC 01295 SN74LS92N A14U32 1820 1478 IC CNTR TTL LS BIN ASYNC 01295 SN74LS93N A14U33 1826 0508 IC 10 BIT D A CONVERTER 24355 AD561JD A14U34 1820 1441 IC TTL 4 BIT FULL ADDER 01285 5 7415283 A14U35 1820 1441 IC TTL 4 BIT FULL ADDER 01295 SN74LS283N A14U36 1820 1441 iC TTL 4 BIT FULL ADDER 01295 SN74LS283N A14U37 1820 1441 IC TTL 4 BIT FULL ADDER 01295 SN74L 5283N A14U38 1820 1441 IC TTL 4 BIT FULL ADDER 01295 SN74LS283N A14U39 1820 1197 IC QUAD NAND GATE CMOS 2 INPUT 01295 SN74L SOON 14040 1826 0779 DUAL 4 CHANNEL MULTIPLEXER 24355 AD7502JN A14U41 1826 0735 OP H SLEW RATE 34371 2507 5 A14U42 1826 1071 IC OP AMP 28480 1826 1071 A14U43 1818 1574 IC NMOS 32768 32K ROM 450 NS 3 S 55576 SYP2332 MASKED 14044 1820 1730 IC FF TTL LS D TYPE POS EDGE TRIG 01235 SN74LS273N 14045 1820 1195 FF TIL LS D TYPE POS EDGE TRIG 01295 SN74LS175N 14046 1920 1730 IC FF TTL LS D TYPE POS EDGE TRIG 01295 SN74LS273N 14047 1820 1730 IC FF TTL LS D TYPE POS EDGE TRIG 01295 SN74LS273N 14048 1820 1112 FF TTL LS D TYPE POS EDGE TRIG 01295 SN74LS74AN 14049 1820 1199 IC INV TTL LS HEX 1 INPUT 01295 5 741504 A14U50 1820 1112 FF TTL LS D TYPE POS EDGE TRIG 01295 SN74LS74AN 14051 1826 0712 OP AMP LOW BIAS 27014 LF353N introduction to this section for ordering information 7 70 Indi
239. 1071 1826 0742 AD7524JN CD4042BE CD4042BE CD4042BE MC14504BCP CD4051RE LF353N CD4042BE 1826 1071 HA3 2507 5 HA3 2507 5 HA3 2507 5 HA3 2507 5 HA3 2507 5 LM310N 5 4 LM310N MC34081 P HA3 2507 5 IH5043CDE IH5043CDE LF347BN OGS508CJ HA3 2507 5 DG508CJ SC77968L1 HA3 2627 5 LF351N LF351N LF351N LF353N MC34084P MC34081 P IH5043CDE SC77968L1 MC34081P HA3 2507 5 LF351N 1200 0607 1200 0607 1200 0607 ORDR BY DSCRPTN ORDR BY DSCRPTN 8150 0456 TCBS 4N 6 17 Replaceable Parts 6 18 signa or 04935 60031 0160 3815 0160 3815 0160 3815 0160 8623 01804045 0180 4017 01 W 8823 0160 6623 0160 6623 0160 6623 0180 3045 0180 4017 0160 3456 0160 6623 0180 3044 0160 6623 0160 6623 0160 3456 0160 6623 0160 6623 0160 6623 0160 4891 0180 4807 0160 2 0160 6623 0160 6623 018043823 0160 6623 0160 6623 0180 6623 0180 0058 0160 3094 0160 6623 0160 6623 0160 7099 0160 7099 0180 8823 0160 6623 0160 6623 0180 0127 01804374 0180 1746 0180 4833 0180 4835 1080 0291 QOQ 0200090 WHWWO WNW NOOO MANNA wooo AMONG OO 0o A4 TRANSMITTER BOARD Std Units only TRANSMITTER BOARD STD UNIT ONLY CAPACITOR FXD 15UF 4 596 MET POLY CAPACITOR FXD 15UF 5 SOVDC MET POLY CAPACITOR FXD 15UF 5 MET POLY CAPACITOR FXD 1UF 20 50VCD CER
240. 12 6 9 15 2 9 TI 5 3 rey 8 iB 1 3 0012 5 8 2 9 9 osn 144 id 2 0 662 ern 644 nr ia 862 9 2 9 5 iv 8418 isy 3 gar L3 462 619 ro 9en TI 2 3 f sec ee 9 3 99 3 64H 62 LB cid 9 5 en eC 2 3 28 eo co 8 2 ene 2 3 262 3 ern 2918 2G 8 7 162 0 2 u orr 291 L3 069 9 8 62 es TH tik ir og 87 L3 i5 iH 5 9 882 5 8 2 12 zen LD yiv 8 3 5 2 482 17 82 3 5 estt 9 0 9 82 580 5 6 sS 2 3 sen 1 6 T ITS tay 9 0 S gO re 2 2 3 9 5 viH2 5 3 t 8 gt 43 698 Ely r9 L5 frig 3 ziyo 182 i2 201 DIS3G 20 2530 DIS3Q S SS3Q 201 OIS3G 201 9539 438 Ono 338 335 338 Ole 338 41 3 2018207 pjeog 62 8 6 4 5 3 eo 4718 t3 48H 5 eo ocn 9 5 43 8 ezn 9 5 5 3 ezn 95 brib 5 0 2 0 zen 9 5 5 8 3 azn
241. 125W 0 100 A13R7 0757 0290 RESISTOR 6 19K 1 125W TC 0 100 MF4C1 8 TO 6191 F A13H8 0757 0290 RESISTOR 6 19 196 125W F TC 0 100 MF4C1 8 TO 6191 F A13R9 0698 0084 RESISTOR 2 15K 196 125W TC 0 100 C4 1 8 TO 2151 F A13R10 0698 0084 RESISTOR 2 15K 196 125W F TC 0 100 C4 1 8 TO 2151 F A13R11 0698 0084 RESISTOR 2 15 1 125W F TC 0 100 C4 1 8 TO 2151 F A13R12 0757 0453 RESISTOR 30 1K 196 125W F TCF 0 100 4 1 8 3012 A13R15 1810 0281 NETWORK RES 1 0 51 100 OHM X 9 210A104 13816 0757 0442 RESISTOR 10K 1 125W F TC 0 100 C4 1 8 TO 1002 F A13R17 0757 0442 RESISTOR 10K 196 125W TC 0 100 CR 1 8 TO 1002 F A13R18 0757 0442 RESISTOR 10K 196 125W F 0 100 CR 1 8 TO 1002 F A13R19 0698 3457 RESISTOR 316K 1 125W F TC 0 100 0698 3457 A13R20 1810 0281 NETWORK RES 10 SIP100 0K OHM X 9 210A104 A13R21 1810 0369 NETWORK RES 6 SIP100 0K OHM X 5 750 61 R100K A13R22 0698 6360 RESISTOR 10K 196 125W 0 25 0698 6360 2100 3882 CR 1 8 TO 3831 F C4 1 8 TO 5761 F C4 1 8 TO 3481 F C4 1 8 TO 3831 F 1 8 1002 CR 1 8 TO 5001 F RESISTOR TRMR 2K 10 17 TRN RESISTOR 3 83K 1 125W TC 0 100 RESISTOR 5 76K 1 125W F TC 0 100 RESISTOR 3 48K 1 125W TC Q 100 RESISTOR 3 83K 1 125W F TC 0 100 13823 A13R24 2100 3882 069
242. 125W TC 04 100 RESISTOR 9 09 196 125W TC 0 100 RESISTOR 750 196 125W TC 0 100 RESISTOR 750 196 125W TC 0 100 RESISTOR 1 96K 196 125W TC 04 100 RESISTOR 100K 1 125W 0 100 NETWORK RES 8 SIP 22 0K OHM X 7 RESISTOR 100K 136 125W TC 0 100 RESISTOR TRMR 2K 10 TOP ADJ 17 TRN RESISTORS11 1 425W F TC 04 100 RESISTOR 1 96K 1 125W TC 0 100 0698 6360 0757 0819 4 1 8 0 1002 0698 8827 0698 8826 0698 8826 0698 8827 0698 8827 0698 8826 8824 0698 8 C4 1 8 TO 1002 F C4 1 8 TO 1003 F 0698 6360 C4 1 8 TO 196R F C4 1 8 TO 196R F C4 1 8 TO 1003 F C4 1 8 TO 1001 F C4 1 8 TO 1002 F C4 1 8 T0 1002 F C4 1 8 TO 1002 F 1 8 70 9091 4 178 0 751 C4 1 8 T0 751 xn C4 1 8 TO 1961 F C4 1 8T0 1003 F 208A223 4 1 8 0 1003 2100 3882 C4 1 8 TO 51 IR F C4 1 8 TO 1961 F RESISTOR 10K 196 125W TC 0 100 RESISTORS 51 5 1 125W TC 0 100 RESISTOR 1 33K 1 125W TC 0 100 RESISTOR 750 1 125W TC 0 100 RESISTOR 750 1 125W TC 0 100 RESISTOR 100K 1 125W TC 0 100 C4 1 a TO 1003 F RESISTOR 1K 1 125W 0 100 C4 1 8 TO 1001 F RESISTOR TRMR 500 10 C TOP ADJ 17 TRN 2100 3881 RESISTOR 5 11K 196 125W TC 0 100 4 0788 TO 5111 F 5 11K 1 125W F 0 100 RESISTOR TOK T25WF TC 03 100 RESISTOR 51 1K 1 125W TC 0 100 RESISTOR 14 7 1 125W 0 100 RESISTOR 3 48K
243. 125W TC 0 100 19701 MF4C1 8 TO 9091 F A14R24 0757 0420 RESISTOR 750 1 125W 0 100 24546 4 1 8 0 751 14825 0757 0420 RESISTOR 750 1 125W TC 0 100 24546 C4 1 8 10 751 F A14R27 0698 0083 RESISTOR 1 96 1 125W 0 100 24546 4 1 8 0 1961 14828 0757 0465 RESISTOR 100K 1 125 0 100 24546 C4 1 8 T0 1003 F A14R29 1910 0207 NETWORK RES 0 SIP 22 0K X 7 01121 208A223 A14R30 0757 0465 RESISTOR 100K 1 125W TC 0 100 24546 C4 1 8 T0 1003 F 14831 2100 3882 RESISTOR TRMR 2K 10 C TOP ADJ 17 TRN 28480 2100 3882 14833 0757 0416 RESISTOR 511 1 125W 0 100 24546 C4 1 8 TO 511R F 14 34 0698 0083 RESISTOR 1 96K 1 125W TC 0 100 24546 4 1 8 0 1961 14835 0757 0442 RESISTOR 10K 1 125W 0 100 24546 C4 1 8 T0 1002 F A14R36 0757 0394 RESISTOR 51 1 1 125W 0 100 02995 5033R A14R37 0757 0317 RESISTOR 1 33K 1 125W 0 100 24546 4 1 8 1331 14 838 0757 0420 RESISTOR 750 1 125W 0 100 24546 C4 1 8 T0 751 F A14R39 0757 0420 RESISTOR 750 1 125W 0 100 24546 C4 1 8 T0 751 F A14R40 0757 0465 RESISTOR 100K 1 125W 0 100 24546 4 1 8 0 1003 A14R41 0757 0280 RESISTOR tK 1 125W 0 100 24546 4 1 8 0 1001 A14R42 2100 3881 RESISTOR TRMR 500 10 C TOP ADJ 17 28480 2100 3881 A14R43 0757 0438 RESISTOR 5 11K 1 125W TC 0 100 24546 C4 1 8 T0 5111 F A14R44 0757 0438 RESISTOR 5 11K 1 125W 0 100 24
244. 125W F TC 0 100 RESISTOR TRMR 500 10 C TOP ADJ 17 TRN RESISTOR 3 16 1 125W F TC 04 100 RESISTOR TRMR 2K 10 C TOP ADJ 17 TRN Sce introduction to this section for ordering information ndicates factory sclected value Replaceable Parts fr Part umber X45H281 X45H281 2N2904A 2N2218 1853 0036 4 1 8 0 1003 0698 6360 0757 0819 C4 1 8 TO 1002 F 0698 8827 0698 8826 0698 8826 0698 8827 0698 8827 0698 8826 0698 8824 C4 1 8 TO 1002 F 4 1 8 0 1003 0698 6360 C4 1 8 TO 196R F 4 1 8 0 1003 4 1 8 0 1001 4 1 8 0 1002 C4 1 8 TO 1002 F C4 1 8 TO 1002 F MF4C1 8 TO 9091 F C4 1 8 TO 751 F 4 1 8 0 751 C4 1 8 TO 1961 F C4 1 8 TO 1003 F 208A223 C4 1 8 TO 1003 F 2100 3882 C4 1 8 TO 511R F C4 1 8 TO 1961 F 4 1 8 0 1002 5033R 4 1 8 1331 4 1 8 0 751 4 1 8 0 751 C4 1 8 TO 1003 F C4 1 8 TO 1001 F 2100 3881 C4 1 8 TO 5111 F 4 1 8 0 5111 C4 0 1002 0 3481 T0 5112 F 8 8 8 8 8 8 TO 1002 F 8 TO 3162 F 8 0 1002 8 TO 3162 F 8 TO 1001 F T 8 8 8 0 5112 0 1333 0 1002 0 1002 TO 3162 F TO 1002 F T0 3162 F 8 0 825 8 0 1002 8 8 1 8 8 TO 3162 F 8 8 4 4 4 4 4 4 C4 C4 C4 C4 C4 C4 C4 4 4 4 4 4 1 4 1 8 0 1102 C4 1 8 TO 8251
245. 143 13 144 13 145 13 146 13 147 13 148 13 149 A13C150 A13C151 A13C152 13 153 13 154 A13C155 P Part umber 0160 6623 0160 6623 0180 7 102 0140 6918 0160 5877 0160 7099 0160 6623 0160 5877 0160 7100 0160 7100 0160 6623 0160 6539 0160 6623 0160 6623 0160 6539 0160 6623 0160 6623 0160 7101 0160 6595 0160 6623 0180 0374 0160 6539 0160 6539 0160 6623 0160 7099 0160 5877 0160 6623 0160 6623 0160 7099 0160 5877 0160 6623 0160 6623 0160 7100 0160 6623 0160 6623 0160 5863 0180 6823 0160 6623 0180 6823 0160 6539 0160 6623 0160 6539 0160 7100 0160 7098 0160 7099 0160 5877 0160 7100 0160 6623 0160 6623 0160 6623 0160 6623 0180 0374 0160 6623 0160 7100 0160 7100 0160 7100 0160 6623 0160 6623 0160 6539 0160 6623 0160 6623 0160 6623 0160 6623 0160 6539 0160 6623 0160 6623 0160 7100 0160 6623 0160 7100 0160 6623 0160 6623 0160 6623 0160 5814 CONAN _ OOOH OA MN OOM U FROWN OAD NONON COCCO CO Description CAPACITOR FXD 1UF 20 40VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 5100PF 1 300VDC MICA CAPACITOR FXD 300PF 1 300VDC MICA CAPACITOR FXD 2400PF 1 300VDC MICA CAPACITOR FXD 1200PF 4 196 100VDC MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 2400 1 300VDC MICA CAPA
246. 15 1901 0518 DIODE SCHOTTKY 02062 5082 5509 A13CR16 1901 0518 DIODE SCHOT TKY 02062 5082 5509 A13CR26 1901 0050 DIODE SWITCHING 80V 200 2NS DO 35 28480 1901 0050 A13CR27 1901 0050 DIODE SWITCHING 80V 200 2NS 00 35 28480 1901 0050 A13CR28 1901 0050 DIODE SWITCHING 80V 200 2NS 00 35 28480 1901 0050 A13CR29 1901 0050 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 A13CR30 1901 0050 DIODE SWITCI ING 80V 200MA 2NS DO 35 28480 1901 0050 A13CR31 1901 0050 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 A13J1 1250 0257 CONNECTOR RF SMB M PC 50 OHM 28480 1250 0257 A13JA4 1251 6947 CONNECTOR SGL CNT PIN 025 IN BSC SZSQ 28480 1251 6947 A13JU1 1200 0473 SOCKET IC 16 CONT DIP IP SLDR 28480 1200 0473 A13JU1 1251 4398 SHUNT 4 POSITION 28480 1251 4398 A13JU2 1200 0473 SOCKET IC 16 CONT DIP DIP SLDR 28480 1200 0473 A13JU3 1200 0473 SOCKET IC 16 CONT DIP DIP SLDR 28480 1200 0473 A13JU4 1200 0473 SOCKET IC 16 CONT DIP DIP SLDR 28480 1200 0473 A13JU5 1200 0473 SOCKET IC 16 CONT DIP DIP SLDR 28480 1200 0473 A13JU5 1251 4398 SHUNT 4 POSITION 28480 1251 4398 A13JU6 1258 0141 JUMPER REMOVABLE FOR 025 IN SQ PINS 28480 1258 0141 A13JU6 1251 6947 CONNECTOR SGL CONT PIN 025 IN BSC SZ 28480 1251 6947 A13JU7 1258 0141 JUMPER REMOVABLE FOR 025 IN SQ PINS 28480 1258 0141 A13JU7 1251 6947 CONNECTOR SGL CONT PIN 025 IN BSC SZ 28480 1251 6947 A13JW2 0811 3587 RESISTOR 0 OHMS 03123 104 A13R1 0757 0442 RESISTOR 10K 1 125W F TC 0 100 24546 4 1 8 1002
247. 15 1902 1399 14 16 1901 0731 14 17 1901 0731 A14CR18 1901 0731 14 19 A14CR20 1901 0033 1901 0033 A14CR23 1902 1399 A14CR24 1884 0250 A14CR25 1902 0052 A14CR26 A14CR27 A14CR28 A14CR29 A14CR30 A14CSA1 A14CSA2 14 2 1423 1901 0731 1901 0033 1901 0033 1902 0202 1902 0202 1251 6947 1251 6947 1251 6856 1251 4573 A14JU1 1251 6947 A14JU2 1251 6947 1258 0141 A14JU5 1251 6947 1258 0141 A14JU68 1251 6947 1258 0141 A14JU14 1251 6947 1258 0141 A14JU14 1251 6947 1258 0141 A14JW2 14 3 0811 3587 0811 3587 A14P1 4 1 1402 1251 6947 1853 0512 1854 0575 6 34 Model 4935A Qty Description ode umber AO OO OONN NNNNN 9 44 11 XXI WU 2 2 02 G3 0 Ga C Go CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0180 8500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD 01UF 10 50VDC CER 0160 6500 CAPACITOR FXD
248. 15K 196 125 C 0 100 4 1 8 0 0151 A3R10 0698 0084 9 RESISTOR 5 15 1 125 0 100 C4 1 8 TO 2151 F A3R1 RESISTOR 2 15K 1 125W F 0 1 C4 1 8 T0 2151 F A3R12 0089 RESISTOR 30 1K 1 125W TC 0 1 0 3012 A3R15 1810 0281 9 NETWORK RES 10 SIP100 0K OHM x 9 210A104 18 0757 0442 9 RESISTOR 10K 1 125W TC 0 100 V4 1 8 TO 1002 F A3R17 0797 0442 9 RESISTOR 10K 1 125W TC 0 100 V4 1 8 TO 1 002 F A3R18 0757 0442 9 RESISTOR 10K 1 125W 0 100 4 1 8 0 1002 A3R19 0698 3457 6 RESISTOR 318K 1 125W TC 0 100 0698 3457 A3R20 1810 0281 9 NETWORK RES 10 SIP100 0K OHM 9 210A104 A3R21 1810 0369 4 NETWORK RES 6 SIP100 0K OHM X 5 750 61 R100K A3R22 0698 6360 6 RESISTOR 10K 1 125W TC 0 25 0698 6360 A3R23 2100 3882 8 RESISTOR TRMR 2K 10 TOP ADJ 17 TRN 2100 3882 26 0698 3152 8 RESISTOR 3 48 1 125W F 0 109 C4 1 B TO 3481 F A3R27 0698 3153 9 RESISTOR 3 83K 196 125W F TC 0 1 4 1 8 T0 3831 F A3R28 8350 6 RESISTOR 10 1 125 TC 0 cor C4 1 8 TO 1002 F A3R29 9052 RESISTOR 5 196 125W TC 0 100 4 1 8 0 5001 A3R30 0757 0416 7 RESISTOR511 1 125W TC 0 100 C4 1 8 TO 511R F A3R32 0757 0416 7 RESISTOR511 1 125W TC 204 100 C4 1 8 TO 511R F 43883 2100 9 RESISTOR TRMA 10 ADJ 1 dd TRN 2100 3883 3834 57 9 RESISTOR 10K 1 125W 4 1 B TO 1 002 F A3R35 0757 0420 3 RESISTOR 750 1 125W TC OF 10
249. 160 0576 0160 0576 0160 0576 0180 0374 0160 0576 0180 0374 0180 0374 0160 0340 0160 3291 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 2202 0160 6320 0180 0374 0160 6318 0160 6320 0160 0576 0160 0576 0180 0197 0180 0197 0160 6320 0160 6320 0160 6320 0160 6185 0160 6317 0160 6185 0160 0576 0160 0576 O co cO CO 0D Qn O D Ct CO On ww Oro O C C GO Go AON OV A mn mon Aang CD See introduction this section for ordering information Table 6 3 Replaceable Parts Continued HP Part Number Description 04935 60004 RECEIVER BOARD ASSY STD UNIT ONLY CAPACITOR FXD 75UF 100 20 300VDC AL CAPACITOR FXD 15UF 10 20VDC TA CAPACITOR FXD 15UF 10 20VDC TA CAPACITOR FXD 15UF 10 20VDC TA 1UF 2090 50VDC CER CAPACITOR FXD 620PF 5 30VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR F XD 1UF 20 SOVDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 2000PF 4 595 300VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 4 2095 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD O1UF 1 100VDC MICA CAPACITOR FXD 1UF 10 50VDC CER CAP
250. 160 6623 HP204571PF3C1 1500 106X9020B2 150D106X9020B2 0160 6623 01604623 0160 6623 15D106X9020B2 150108X802082 150106X902082 0160 6623 MD15E380J030WV1CR 0160 0167 0160 6623 0160 6623 0160 6623 150D106X9020B2 0160 8623 1500 106X9020B2 180D106X9020B2 0160 7103 0160 7089 0160 6623 0160 6623 0160 6623 0160 6623 0160 6623 0160 6623 0180 7100 150D106X9020B2 0160 7098 0160 7100 0160 6623 0160 6623 150D225X9020A2 150D225X9020A2 0160 7100 0160 7100 0160 7100 0160 6268 01606595 0160 6268 Model 4935A signator 103 104 HP Part umber 0160 6623 01606623 01 W 6823 0160 6623 0160 5877 0160 7099 0160 6623 0160 5877 0160 7100 0160 7100 0160 6623 0180 6539 0160 5877 0160 6623 0160 6623 0160 7100 0160 6623 0160 6623 0140 0228 0160 6623 0160 6539 0160 7100 0160 7098 0160 7099 01805877 0160 6623 0180 0374 0160 7100 0160 6623 0160 6623 01 W 6539 0160 6623 0160 8623 0160 6623 0160 6623 0160 6539 0160 6623 0160 6623 0160 6623 0160 6623 0160 5814 0160 5811 0180 0197 0180 0197 O DOONAN NOANA AN AM m out NOAH U amp ouo Quge ooo wwa C OO m Description CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 4 2096 50VDC CER CAPACITOR FXD 110PF 4 195 300VDC MICA CAPACITOR FXD 1 UF 20 CER CAPACITOR FXD 0 50VDC CER C
251. 1820 2576 IC QUAD NAND GATE CMOS 2 INPUT MC14011BCL A14U18 1820 0939 IC FF CMOS D TYPE DUAL CD4013AF 14018 1820 2576 QUAD NAND GATE CMOS 2 INPUT MC14011BCL A14U20 1820 1960 DUAL NAND GATE CMOS 4 INPUT MC14012BCP 14021 1826 0667 OP AMP LOW BIAS LF351N A14U22 1820 1977 IC ECL OSCILLATOR MC12061P A14U23 1820 3008 IC OSCILLATOR MM74HCUOAN A14U24 1826 0712 IC OP AMP LOW BIAS H IMPD LF353N A14U25 1826 0138 GP QUAD COMPARATOR 14 PIN DIP LM339N A14U26 1820 1956 QUAD LCH CMOS COM CLOCK CD4042BE A14U27 1820 1956 IC QUAD LCH CMOS COM CLOCK CD4042BE A14U28 1820 1956 IC QUAD LCH CMOS COM CLOCK CD4042BE A14U29 1820 1956 IC QUAD LCH CMOS COM CLOCK CD4042BE oppor ONO CONNU AOUR 14030 1820 1956 QUAD LCH CMOS COM CLOCK CD4042BE See introduction to this section for ordering information Indicates factory selected value 6 36 Model 4935A Replaceable Parts Besignator Qty Description 14031 14032 14033 14034 14035 14036 14037 14038 14039 14040 14041 14042 A14U43 A14U44 A14U45 A14U46 A14U47 A14U48 14049 A14U50 A14U51 A14U52 14053 4 A14XU32 A14Y1 A14Y2 A14Y3 1820 1420 1820 1478 1826 0508 1820 1441 1820 1441 1820 1441 1820 1441 1820 1441 1820 1197 1826 0778 1826 0735 1826 1071 1818 1574 1820
252. 189 H Bjuiu u m jw 6 4 ign e vin 93 82 2140 3 a zn 90 ova LHO gH 22 0 80 n gt 164 22 ea 642 if ares CEN 08H 2 9 amp 68 eile zij 5 2 Ew i ie 68 940 1 v H als ey y s D la gt 92 H ar 62 an ova 8 PHO s 4 n 12 af 2 Si 9 cj 3 fe a n 8 s i 488 2 1 org eg 9 4 6 sv 15 4 eei L E 281 Ln ey sg 545 gt l al 1 2 i gt 61 3 99 2 sn SD Ley 53 gt 2 ot de oz gt s n 092 25 ve eo 62 5 2 9 z a zo n T 1 de ef 892 cO n 82H 5 3 249 5 LG de E 4 Lis oj 27 852 oro 3 2 id 9d4 1 f E Sie is gt T rt x ar 199 8 in oro izy 042 Li sri ojia iso ta Odl 3 682 26 gt g E 3 825 562 893 4 n j wwe 3 8H 62 s 80 hee P 9 3 5 tdi H 580 01 lz 2 0 jt O 0
253. 2 6 2 js 4 is E aH EglH 9 3 98H 2H 0012 812 5 22 fs 22 28 18 94 SH L 5 5 662 G il db d ume o 3 is Cun 1 LH 8H ed inf eec 99 SEN dz 5 9 ar osiu ss rH snr 269 515 s Shee cca NE NL 58 8 5 6 54 sn 552 12 e 09 DOMUM HS E P UM f ein Ss nr c 65 i 9 UO PI S Ce ee ee SH iste i SC ent ze ESC 5 5 12 5 _ er 9918 gt enr 262 its n RU 8 9 zr SSid d 8 8 92 inr id 62 og 242 NO ig ro PR 5 2 oen 7915 iM 93 262 98 62 TED i E m i zer 2 4 94b ea in 689 9 0 E dic 5 zs 25 918 i Za 65 255 is 880 8 D 63 1915 63 ld 6S 9 80 3 280 95 UE ee 63 CH oss 53 9190 i 24 582 s a so 92 aR NN EET m DH 65 58 83 velud 552 94 TO UT EE M 9 3 LH 23 4 23 9 9 8 pew e t3 EH 23 3 22 r3 za 92 ve T 05 id iet
254. 2 1820 1956 1826 1071 1826 0735 1826 0735 1826 0735 1826 0735 1826 07 35 1826 0208 1826 0208 1826 1544 1826 0735 1826 0665 1826 0712 1826 0208 1826 0740 1826 0740 1826 0665 1820 1725 1920 1735 1820 1726 Table 6 3 Replaceable Parts Continued HP Part Number Description RESISTOR 71 5K 1 125W F TC 0 100 RESISTOR 82 5K 1 125W 0 100 RESISTOR 68 1K 1 125W 0 100 2 RESISTOR TRMR 10K 10 TOP ADJ 17 TRN ESISTOR 1 111 1 125W F 0 25 RESISTOR 10K 1 125W F 0 25 RESISTOR TRMR 5K 10 C TOP ADJ 17 TRN 1 RESISTOR 825 1 125W TC 0 100 RESISTOR 1K 196 125W TC 0 100 RESISTOR 100K 1 125W F TC 0 100 RESISTOR 100 1 125W 0 100 RESISTOR TRMR 2 10 C TOP ADJ 17 TRN RESISTOR 16 9K 1 125W F TC 0 50 2 RESISTOR 51 1K 1 125W 0 100 6 0 8 4 7 RESISTOR 100 1 125W TC 0 100 RESISTOR 51 1K 1 125W TC 0 100 RESISTOR 100 1 125W F TC 0 100 1 RESISTOR 5K 1 125W 40 100 NETWORK RES 6 SIP OHM X5 RESISOR 6 838K 1 125W TC 0 25 WIRE 1 2 IN RESISTOR 0 OHMS 1 TRANSFORMER INPUT CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT 025 1 5 52 SQ CONNECTR SGL CONT 025 5 52 SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT 025 85 52 SQ CO
255. 2 2 c TL le 27 7 0 7 82 4 5 z 382 GNO JUMPER WIRE 8 9 9 lt gt s D 1 g 14 16 6 I 6 6 E 1 2 vs 2 psej y 5 2 9 3 14 3 3 14 3 14 3 14 cas z 4 2 4 2 2 2 3 13 I3 4 13 4 4 1 C 6 8 9 2 U ul a ix i 5 12 5 12 5 12 5 2 5 12 s 3 4114 3 U 12 4 5 6 1 8 l amp 6 E E al 3 7 to 7 7 7 7 ig 5 ai 9 al 9 a 9 9 a 9 C34 s 19 cer 4 JUG 9 i 5 4 C 16 is TEE 1B 18 2 is 2 18 2 5 2 Is 2 15 2 13 3 14 3 14 3 l4 3 403 A 14 3 14 897 43 4 m 4 5 4 5 Pa pa 72 5 12 5 i2 5 12 5 12 5 125 12 hs E ba It 6 14 0 7 7 io 7 lo 7 T is s s a 3 R 4 zlo i 4 2 3 4 2 650 amp 2 R73 3 4 LOOP 7 TPS 4 B fit 20 6 I 20 is 5 10 1 19 2 19 2 19 5 9 4 IB 18 3 ia 3 i T 72 15 4 5 7 sj m la 3 14 4 T T x od B Cae 3 4 12 aj 5 he 3 4 ii a 13 IQ 7 o 9 12 9 12 9 T 10 T 3 Pubs 2 el 9 6 9 04935 60203 REVC 2208 38 REVISED 10 92 Figure 7 16 4 Transmitter Board Component Locator
256. 2 0757 0279 RESISTOR 3 16K 1 125W TC 0 100 4 1 8 0 3161 A14R93 0698 8827 RESISTOR 1M 196 125W TC 0 100 0698 8827 A14R94 0757 0442 RESISTOR 10K 1 125W TC 0 100 C4 1 8 TO 1002 F 5033R RESISTOR 51 1 1 125W TC 0 100 RESISTOR 10K 196 125W TC 0 100 A14R85 14896 0757 0394 0757 0442 4 1 ee 002 F MF4C 1 OQO0 00 A14R97 0698 3150 RESISTOR 2 37K 1 125W A14R88 0757 0280 RESISTOR 1K 1 125W TC 0 100 C4 1 8 TO 1001 F A14R99 0698 3157 RESISTOR 19 6K 1 125W 993 A14R100 0757 0428 RESISTOR 1 62K 1 125W 1 A14R101 0698 8827 RESISTOR 1M 1 125W F TC 0 100 0698 8827 A14R102 0757 0280 RESISTOR 1K 1 125W F TC 0 100 C4 1 8 TO 1001 F A14R103 0757 0280 RESISTOR 1K 196 125W TC 0 100 C4 1 8 TO 1001 F 0698 8827 9100 2647 A14R104 14 1 0698 8827 RESISTOR 1M 1 125W TC 0 100 TRANSFORMER AUDIO 9100 2647 14 1 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6947 14 2 1251 8947 CONNECTOR SGL CONT PIN 025 5 5250 1251 6947 A14TP3 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6947 14 4 1251 8947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6947 A14TP5 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6847 A14TP6G 1
257. 2 1 x Eu Oe vc OS hye a Re R90 26 5K c79 i 475 PF 4781 14 3 Rios cas ak 006 RIO sake 2400PF et 12 40 12 4 5 Rios 25 114 485 TPiB 3 1 1 700PF 1 Cu 5 t 81275 8128 NI 2 i 44 2K 36TK ae U46 TRE PES EE el i4V pieces Care veer ele ERE cee s E NE C ou sz meee are ME 24 R126 MK 31 2BK NOTE ONLY ON I 200PF I x JJ i pope 14 2 pos 3KHZ FLAT FILTER C104 2400PF 5 5 124 2400 146 16 4 2260 8141 8 42 C126 2210 2210 23 1 200 l L o PAR 71 2 164 74 RITE 143K 66 K 136 8156 1700PF 14 9630 8155 126 10K 48 DM 2 12 5 U37 3 7 JUI TRUTH TABLE al 5 4 PIN 21102 01 100 FILTER RIT3 s 2 5 14 P AR FILTER OPTIONS 002 003 ONLY C155 Ria amp 9X Figure 7 11 A3 13 Receiver Board Schematic 1 of 2 7 21 7 22 blank jo 2 6
258. 2 LOOP ADJ until agrees with the voltage reading in stcp S A Recheck the OUTPUT LEVEL If the HP3455 ACVM still reads within of voltage step X continue Otherwise repeal steps 3 h Model 4935A Adjustment Calibration ADJUSTMENTS 5 15 RECEIVER ADJUSTMENTS REFERENCE A3 Recciver Assembly EQUIPMENT AC DC Voltmeter HP 3455 Calibrator Fluke 5200A PROCEDURE on 4935A select DISPLAY TRMT MEASUREMENT NOISE NOR REV NOR 2 Offset Ad justment Short 10 to A3TP2 I Short A3TP22 to A3TP23 b Measure the DC voltage TP24 Adjust A3R33 OFFSET ADJ if the voltage is not within 0 3 C Remove the shorts placed in Step 2a SET Uf Ho UE MODEL 4935A VOLTMETER FIG 5 2 Receiver Adjustments 3 Connect the equipment as shown in Figure 5 2 4 On 49354 select DISPLAY RCV NOR REV NOR MEASUREMENT LEVEL FREQ SET UP KC V 600 BRG in both HOLDs out 5 Set the AC Calibrator to 8l 6mV 0 5mV frequency to 100 0 Connect the Calibrator into the receiver jack 5 5 Adjustment Calibration Model 4935A 0 10 5 16 1 2 6 ADJUSTMENTS Move ACVM to A3TP25 adjust A3R77 RCV GAIN reading of 8 l6mV 4 5mV Adjust A3R23 AVG DET until the display flickers between 0 4 9 0 5 dBm On 4935A LEVEL FREQUENCY change to NOISE FILTER change to SkHz Check that the ACVM still reads 8 LomV 0
259. 2 and 3 Display RCV Characteristic P AR Waveform See Figure 8 18 DOZ et Tow P 2000 Frequency Hz Figure 8 19 P AR Transmit Signal Frequency Spectrum The characteristic P AR waveform can be checked with a spectrum analyzer using Figure 8 19 or with an oscilloscope using Figure 8 20 FREQUENCY 140 625 390 625 640 625 890 625 1140 625 1390 625 1640 625 1890 625 2140 625 2390 625 2640 625 2890 625 3140 625 3390 625 3640 625 3890 625 Service 8 41 Service 8 42 Model 4935A f 1 y I Figure 8 20 P AR Transmit Signal Envelope 8 207 OUTPUT AMPLIFIER 8 208 The output power amplifier provides the amplification necessary for a 13dBm output level The OUTPUT LEVEL control provides a full dynamic range of 40dBm to 13dBm To test adjust the transmit level to approximately O dBm The output waveform appears at the negative side of C72 as an approximate 8v signal and a 4 to 5v signal at the juncture of R81 R82 and 83 Simple signal tracing should isolate problems to the component level NOTE The signal crest lactor prevents valid signals greater than When the signal level is too high the display blanks At this point the instrument is overranged positive state condition 8 209 At low frequencies and high output levels the 4935A TRMT output has considerable
260. 2000 DET TP23 24 14 C35 R28 R4E R39 R38 4640 2570 100 9 2 HE FORCED CN iD 10 15V 3480 L d4 F 0v V io 4 PES 4 P YYYY is gt 2860 E I M a SERIES 2247 a s ww q a a i TRUTH TABLE FOR 139 06 414 777 77 1150 0 1 Peiper 5141 i 7 j 140 9 Is AR dp C133 99 j GR26 e ae 0 JV IO to a 4 EEEO Gals T bn lass ped OOPF Pt 0 1 f 838 ZR27 79 E 132 dd R94 iE RE V R92 1141 ARE DRAWN AS THEY WOULD ON THE CON ROt OUTPUT IMPULSE NOISE GE MDAC _9 MUX EN Ra 6190 MES PAR PEAK GNDED iN f 24 STI UNIT D A NO 3 2 4 Do LEVEL Al ao 10 Qi DI y DI Q2 02 02 10 5 E 414 V i C21 D 0 1 100 dr pred T
261. 20B2 A13C47 0180 0374 3 CAPACITOR FXD 10UF 10 20VDC 56289 150D106X9020B2 A13C49 0160 0340 1 1 CAPACITOR FD 600PF 1 300VDC MICA 28480 0160 0340 A13C50 0160 3291 7 5 CAPACITOR FXD 1200PF 1 100VDC MICA 28480 0160 3291 A13C51 0160 0576 5 CAPACITOR FXD 1UF 2096 50VDC CER 28480 0160 0576 A13C52 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 13 56 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC 28480 0160 0576 A13C57 0160 2222 2 CAPACITOR FXD 1500PF 1 595 300VDC MICA 28480 0160 2222 A13C58 0160 6320 9 14 CAPACITOR FXD 1700PF 1 100VDC MICA 08113 204751 1 A13C59 0180 0374 3 CAPACITOR FXD 100 10 20VDC 56289 150D106X9020B2 A13C60 0160 6318 5 2 CAPACITOR FXD 1100 1 t00VDC MICA 08113 GO2044751PF3C1 A13C61 0160 6320 9 CAPACITOR FXD 1700PF 196 100VDC MICA 08113 HP204751PF3C1 A13C62 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C63 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C64 0180 0197 8 4 CAPACITOR FXD 2 20 1096 20VDC TA 56289 150D225X9020A2 A13C65 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC 56289 1500225 9020 2 13 66 0160 6320 9 CAPACITOR FXD 1700PF 1 100VDC MICA 08113 HP204751PF3C1 A13C67 0160 6320 9 CAPACITOR FXD 1700PF 1 100VDC MICA 08113 HP204751PF3C1 13 68 0160 6320 9 CAPACITOR FXD 1700PF 1 100VDC MICA 08113 HP204751PF3C1 A13C69 0160 6185 4 2 CAPACITOR FXD 1000PF 1 500VDC MICA 08113 HP204751PF3C1 13 70 0160 6317 4 3 CAPAC
262. 22 MARZO 91747 1 2 01 02981 8506 60477 606278 46711 PI ay 941845 76057 02052 1670 08530 99505 4304 95014 429 1 95051 01747 06226 19102 60015 25801 Model 4935 4935 Replaceable Parts Rete erence P Part m fr Part esignator umber Qty Description umber Al Al A1D1 DS40 04935 80027 55998 98009 80010 80040 1990 0810 0160 0576 0160 0576 0160 0302 0160 0576 0180 029 1060 0576 0160 0576 0160 0576 0180 0373 01 W 3879 0160 3879 0160 0576 0160 0576 0160 0576 0180 0373 0160 3879 0160 3879 0160 0576 0160 0576 1906 0069 1908 0069 1826 0585 1826 0585 1990 0649 1990 0540 1 SW 0540 1990 0540 1990 0540 1890 0540 1990 0540 1990 0540 1990 0540 1990 0805 1251 8947 1252 134 1252 1134 15218947 1251 6937 1250 0257 1854 0643 18540643 18640575 1854 0071 1854 0575 1854 0575 1854 0575 1854 0071 1854 0575 1854 0575 0757 0461 0698 3132 2 3 9 3 5 5 5 5 3 7 4 4 5 5 5 6 5 5 2 7 7 5 5 5 2 7 7 5 5 4 4 9 9 3 3 3 3 3 3 3 3 3 3 7 7 0 4 4 93 A2 SWITCHBOARD All Units SWITCH BOARD ALL UNITS FRONT PANEL W PAR OPT 002 003 ONL FRONT PANEL WNT STD 1 LED SERVICE ONLY CAPACITOR FXD 1UF 20 5OVDC CER CAPACITOR FXD 1UF 20 5OVDC CER CAPACITOR FXD 018UF 10 200VDG POLYE CAPACITOR FX
263. 23 01 W 6623 HP204751PF3C1 01 W 6623 150D106X9020B2 HP204751PF3C1 HP204751PF2C1 0180 6623 0160 7099 01 w 5877 01 W 6623 01 W 6623 01 w 7099 0160 5877 01 W 6823 01 W 6623 0160 7100 01 W 6623 0160 6823 HP204751PF3C1 01 w 6623 01 W 6623 0160 6623 HP204751PF3C1 0160 6623 0160 6539 0160 7100 0160 7098 0180 7098 01 W 5877 0160 7100 0160 6623 0160 6623 01 W 6823 150D106X9020B2 01 w 6530 0160 6623 0160 6823 01 W 6623 0160 8623 01 w 8539 01 W 6623 0180 6623 0160 6623 0160 6623 0160 5814 0160 5811 150D225X9020A2 150D225X9020A2 6 13 Replaceable Parts eference P Part m fr fr Part gnator umber 8 oy Description ode umber 159 0160 6823 CAPACITOR FXD 1UF 20 CER 0160 6623 3 160 CAPACITOR HAND SELECTED IF NEEDED A3C201 0160 6623 CAPACITOR FXD IUF 20 50 0160 6623 30202 CAPACITOR HAND SELECTED ONLY a A3C203 0160 6500 CAPACITOR FXD OIUF 1096 50VDC CER 0160 6500 1 1901 1068 DIODE SM SIG SCHOTTKY 1901 1068 A3CR3 1901 0040 DIODE SWITCHING 308 50MA 2NS DO 35 1901 0040 A3CR4 p ah 3 RESISTOR 0 OHM 104 5 DIODE SWITCHING 30V 2NS DO 35 1901 0040 1j 190 0376 DIODE GEN PRP 35V 50MA CO 35 1901 0376 A3CR8 1901 0518 1901 0476 DODIODE SCHOTTKY GEISOMDO 35 1901 0376 A3CR9 1901 0518 IODE SCHOTTKY 5082 5509 11 1901 0518 IODE SCHOTTKY 5082 5508 A3CR12 1901 0518 DIODE SCHOTTKY 5082 5508 A3CR13 1901 0050 3 DIODE S
264. 251 6947 A13U1 1826 0712 IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P LF353N A13U2 1826 0138 IC COMPARATOR GP QUAD 14 DIP P PKG LM338N A13U3 1826 0624 IC CONV V FREQ 14 DIP P VFC32KP A13U4 1826 1071 IC OP AMP 1826 1071 A13U5 1826 0742 IC PRECISION 10V REFERENCE AD581J 1826 0742 A13U6 1828 0639 IC CONV 8 B D A 160DIP P PKG AD7524JN A13U7 1820 1956 IC LCH CMOS COM CLOCK QUAD CD4042BE A13U8 1820 1956 IC LCH CMOS COM CLOCK QUAD CD4042BE A13U11 1820 1956 IC LCH CMOS COM CLOCK QUA CD4042BE A13U12 1820 2326 IC XLTR CMOS TIL TO MOS HEX MC145048CP A13U13 1820 1315 MULTIPLXR 8 CHAN ANLG 16 DIP P PKG CD4051RE A13U14 1826 1544 IC OP AMP GP 8 DIP P PGK 1826 1544 A13U15 1826 0667 IC OP AMP LOW BIAS H IMPD 8 DIP P PKG LF351N A13U16 1826 0712 IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P LF353N A13U17 1820 1956 IC LCH CMOS COM CLOCK QUAD CD4042BE A13U20 1826 1071 IC OP AMP 1826 1071 A13U21 1826 0735 IC OP AMP H SLEW RATE 8 DIP P PKG HA3 2507 5 A13U22 1826 0735 IC OP AMP H SLEW RATE 8 DIP P PKG HA3 2507 5 A13U23 1826 0735 IC OP AMP H SLEW RATE 8 DIP P PKG HA3 2507 5 5 CONMHR OOOOO OOOOO G DHAURA A13U24 1826 0735 IC OP AMP H SLEW RATE 8 DIP P PKG HA3 2507 5 13025 1826 0735 1 IC OP AMP H SLEW R
265. 251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6947 14 7 1251 8947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6947 A14TP9 1251 6947 CONNECTOR SGL CONT 025IN BSC SZSQ 1251 6947 A14TP10 1251 6947 CONNECTOR SGL CONT 025IN BSC SZSQ 1251 6947 A14TP11 A1ATPS S 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6947 1251 6847 1251 6947 A14U1 1826 0679 OP AMP LOW BIAS H IMPD TO 99 CA3140AT A14U2 1820 1932 IC MV CMOS DUAL MC14538BCP 1403 1820 1932 MV CMOS MONOSTBL DUAL MC14538BCP 1404 1820 0939 IC FF CMOS DUAL CD4013AF A14U5 1820 0939 IC FF CMOS D TYPE DUAL CD4013AF A14U6 1820 2472 MICROPROCESSOR MK3872 1820 2472 A14U7 1820 1827 OCDR CMOS 4 TO 16 LINE 74 154 A14U8 1826 0728 IC PRECISION GEN PURPOSE REG 501532 1409 1826 0411 IC TIMER CMOS MC14536BCP A14U10 1826 0411 TIMER CMOS MC 14536BCP A14U11 1820 1956 QUAD LCH CMOS COM CLOCK CD4042BE A14U12 1820 1956 IC QUAD LCH CMOS COM CLOCK CD4042BE A14U13 1820 2566 IC BFR CMOS QUAD LINE DRIVER MM74C240N A14U14 1826 0728 IC PRECISION GEN PURPOSE REG 61532 A14U15 1820 1745 QUAD NOR GATE CMOS 2 INPUT 14001 A14U16 1820 2576 QUAD GATE CMOS 2 INPUT MC14011BCL A14U17
266. 25W TC 0 100 0757 0424 RESISTOR 1 1K 1 125W 0 100 A3R39 0698 3150 RESISTOR 2 37K 1 125 F TC 0 100 A3R40 0757 6360 RESISTOR 10 1 125W TC 0 100 Scc introduction to this section for ordering information Indicates factory selected value 7 49 Manual Changes Model 4935A Table 6 3 Replaceable Parts Continued Reference HP Part Designator Number D Qty Description 0757 6360 RESISTOR 10K 1 125W TC 0 100 0757 0420 3 RESISTOR 750K 1 125W F 0 100 0698 4480 RESISTOR 15 8 1 125W TC 0 100 0698 4490 RESISTOR 15 8K 1 125W F TC 0 100 0698 3155 2 RESISTOR 4 64K 1 125W F TC 0 100 0698 4475 1 RESISTOR 9 76 1 125W 0 100 PMF55 1 8 T0 9761 F 0698 7847 3 RESISTOR 1 111K 1 125W F TC 0 100 19 111R 8 0698 6360 RESISTOR 10K 1 125W 0 25 0698 6360 0698 3409 1 RESISTOR 2 37K 1 125W 1 8 0 2371 0698 0083 RESISTOR 1 96 1 125W 1 8 0 1961 0757 0864 2 RESISTOR 301K 1 5W F 0 100 0757 0864 A3R53 0757 0864 RESISTOR 301K 1 5W F 0 100 0757 0864 A3R54 0698 3453 1 RESISTOR 196K 1 125W TC 0 100 4 1 8 10 1963 A3R55 0646 0757 4 RESISTOR 100 1 125W TC 0 100 C4 1 8 T0 101 F A3R56 0757 0438 1 RESISTOR 5 11K 1 125W 0 100 C4 1 8 TO 5111 F A3R57 0698 3155 RESISTOR 4 64K 1 125W F 0 100 4 1 8 0 4641 A3R58 0757 0199 2 RESISTOR 21 5K 1 125W TC 0 100 C4 1 8 T0 2152 F A3R60 0698 6369 RESISTOR 10K
267. 28 SHT2 U6 27 SHT2 7 ue 26 SHT2 C TOU7 10 SHT2 4 FEY 0 07 16 SHT2 C 01 1 SC FREQ INTROL MEAS CONTROL READ BUFF MPN RESET 2 READ BUFF O F TO 015 1 SHT2 70 0913 19 SHT2 TO U6 8 9 10 11 SHT2 TO U32 11 5 3 TO 06 29 SHT2 TO U6 30 SHT2 TO 6 33 SHT2 TO 06 52 SHT2 I ee P 9134 SHT2 TO 13 2 SHT2 1 14 C88 5V ES 0 01 x U16AP 2 3 2 J19A TONE FREQ SELECT x C91 D 0188 l 0 01 Paz 2 R O R E N mei Figure 8 36 A4 Transmitter Board Schematic Diagram Sheet 1 of 5 8 83 FRONT PANEL SWITCH BD ASSY P O A2 SF DISPLAY MEAS SKIP F2 DE ce 12 e M DISPLAY STEP FILTER STOP T R UP STORE F4 C C 6 O 11 LEFT LEVEL START ARROW ZERO jRESET F3 10 RIGHT PERIOD ARROW 1 2 TO U9 13 9 TO U10 13 TO 9 7 TO 010 2 amp 09 2 TO U4A 1 TO 048 13 TO U5A 1 CIRCUIT APPLIES TO STANDARD UNITS ONLY TREE CIRCUIT APPLIES TO UNITS ONLY U11 5 U12 5 U12 10 U15C 10 U188 2 U15A 3 amp 0158 5 SHT 1 SHT 1 SHT 1 SHT 1 SHT 1 SHT 1 SHT 1 SHT 1 SHT 1 SHT 1 SHT 1 SHT 1 SHT 1 N m tto 9 i 1G n R OF
268. 2952 1854 0071 TRANSISTOR NPN SI PD 300MW FT 200MHZ 28480 1854 0071 42053 1854 0575 TRANSISTOR NPN 51 PD 625MU FTz S50MHZ 04713 MPS A42 a2055 18054 0575 TRANSISTOR NPN SI PD 625MW FT 50MHZ 04713 5 42 2071 1854 0575 TRANSISTOR NPN SI PD 625MW FT 50MHZ 04713 MPS A42 A2072 1854 0071 TRANSTSTOR NPN PD 300MU FT 200MHZ 28480 1854 0071 820975 1854 0576 TRANSISTOR NPN PD 625MU FT 50MHZ 04712 MP 3 442 62075 1854 0575 TRANSISTOR NPN PD 625MW FTcS0MHZ 04713 5 42 285 0757 0461 RESISTOR 68 1K 1290 TCzs0 100 24946 4 1 8 0 8 APRS 0257 0288 RESISTOR 9 09 1 129W F 0 100 19701 MP 401 8 T0 9091 F 2815 0757 0458 RESISTOR 1 1K 1 125W 1 0 100 24 46 4 1 8 10 9112 APRIB 0757 0461 RESISTOR 68 1K 1X 1254 0 100 24546 CA 1 8 TO0 6812 F 2615 0698 3132 RESISTOR 261 1 125W YC 100 204546 178 10 2610 F APRO 0757 0442 RESISTOR 10K 1 1254 0 100 2446 178 T0 10072 F 2821 0698 0558 67 3 25 1 0 50 20480 069 8558 ASR22 0698 05 58 RESISTOR 67 3 PSZ W TCs0 5 28480 0698 8558 2622 0699 065 RESISTOR 300 25 1 0 50 28480 0699 0657 AOR2A 06599 06757 RESISTOR 300 SW 1020 50 20480 06599 0657 See introduction to this section for ordering information ndicates factory selected value 7 45 Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued HP Part Number Description Mfr Part
269. 3 A13 SoS 2 RECEIVER ASSY CIRCUIT APPLIES TO STANDARD UNITS ONLY uj CIRCUIT APPLIES TO UNITS ONLY 35 145 4 10 88 Figure 8 39 4 Transmitter Board Schematic Diagram Sheet 4 of 5 8 89 i ee ee r P O A4 A14 TRANSMITTER BOARD ASSY 04935 60034 REAR 1 2110 0065 2110 0296 AC LINE VOLT 100 120 220 240 FUSE 375MA 375MA 200MA 200MA NOTE FUSES ARE NON TIME DELAY TYPES CHASSIS N ris E c lt m CHASS eee TOT OTe TRANSMITTER BOARD ASSY 04935 60034 REV 2850 58 POWER SUPPLY SEC pae mem mt CROWBAR OVERVOL TAC PROTECT CIRCUIT REAR PANEL 1 2110 0065 2110 0298 Y R INE VOLT 100 120 220 240 17 R15 FUSE 375MA 375MA 200MA 200MA FUSES ARE NON TIME DELAY TYPES ROS 10K 10 m GROUND PLANE BLACK m e NR _ 15 i Ec x BL GR 22 322 TP GND GROUND PLANE N CHASSIS GROUND PLANE R1 C5 100K 2200 UPPLY SECTION QVERVOL TAGE wie r CIRCUIT Po 2 vax 18 0 LE i 855 CR24 40 100K 4 GROUND PLANE P O REAR PANEL ASSY NOTE 5 C14 R25 750 TP GND C62 C17 NOTE 5 1 473 18 CNET 17 ASSY L SPE SE it Tr 715 amp 414V
270. 31 E amp c efe 2 3 A u 3 12 J 1 s gt po 94 a 4 3 10 al 5 14 gi Wa bere T 5 7 t6 RIR RIR 34 43 4 0 all Jra 315 e ess 5 5 NEMPE p Um Ks 5 E sss 4 9 5 lt 3 1 10 7 4 i 5 a El EA 6 JU 7 2 RN x 3 EN e if te 0 7 e he if M ue e 2 15 t5 2 5 2 13 2 I5 2 15 J a 5 a 5 4 3 13 4 4 13 4i s 3 6 4 gt 4 g 5 2051 2 s 2 5 5 12 5 i2 e 6 6 u 6 4 6 HI e T ID 7 10 7 7 7 19 mI 14 a 7 14 114 124 L 9 NET 22 21 2 2 E _ 2 2 sf al ua Y i 4 4 a 2 5 a 5 5 aj g ita 5 lis 5 RP Re ft RI 17 6 15 3 6 15 61 15 UE 1a 5 T 14 i 1168 13 a Ae om qu 14 42 10 3 12 2 si 3 0 i i a i al 9 S 2 0 1 TPS 7 ti out 4 _________
271. 3C 72 0180 1746 CAPACITOR FXD 15UF 10VDC TAR 150D155X9020B2 DYS 4 73 0160 4833 CAPACITOR FXD 022UF 20 100VDC CER 0160 4833 A4C74 0160 4835 CAPACITC 1UF 10 50VDC CER 0160 4835 4 75 1080 0291 CAPACITOR FXD 1UF 10 35VDC CER 0180 0291 AACP 1 1251 6947 CONNECTOR SGL CONT 025 5 5250 1251 6947 introduction to this section for ordering information Indicates factory selected value Manual Changes Model 4935A Table 6 3 Replaceable Parts Continued HP Part Number Description Reference Designator Mfr Part Number 4 1 1902 0041 DIODE ZNR 5 11V 5 20 35 PD2 4W 1902 0041 A4CR4 1901 0033 DIODE GEN PRP 180V 200 00 7 1902 0033 4 6 1901 0731 DIODE PWR RECT 400 1A 1901 0731 A4CR7 1902 1399 DIODE ZNR 18 0V 2 PD 4W IN5248 A4CR9 1901 0731 DIODE PWR 400 1901 0731 AACR10 1901 0731 DIODE PWR RECT 400V 1A 1901 0731 A4CRI11 1801 0731 DIODE PWR RECT 400V 1A 1901 0731 12 1901 0731 DIODE PWR RECT 400V 1901 0731 AACR13 1901 0033 DIODE GEN PRP 180V 200MA DO 7 1901 0033 A4CR14 1901 0033 DIODE GEN PRP 180V 200MA DO 7 1901 0033 A4CRI5 1902 1399 DIODE ZNR 18 0V 2 PD 4W INS248 A4CRI6 1901 0731 DIODE PWR RECT 400V 1A 1901 0731 A4CR17 1901 0731 DIODE PWR RECT 400V 1901 0731 A4CRI8 1901 0731 DIODE PWR RECT 400V 1A 1901 0731 A4CR19 1901 0033 DIOD
272. 4 25 to 1902 3105 DIODE ZNR 5 62V 2 4W CD 4 MFG CODE 28480 MEG P N 1902 3105 Page 6 32 Table 6 3 Replaceable Parts Change AT4CR7 to 1902 3214 DIODE ZNR 16 2V 2 4W CD 6 MFG CODE 38480 MFG P N 1902 3214 Change AI4CRI5 to 1902 3214 DIODE ZNR 16 2 V 2 AW CD 6 MFG CODE 28480 P N 1902 3214 jp Modcl 4935A Manual Changes Change 14 2 to 1902 3214 DIODE ZNR 16 2V 2 4W CD 6 MFG CODE 28480 MFG P N 1902 3214 Change 14 25 to 1902 3105 DIODE ZNR 5 62V 200 4W CD 4 MFG CODE 28480 MFG P N 1902 3105 Page 6 35 36 blank Table 6 3 Replaceable Parts Change to 2110 0065 FUSE FOR 100 120V INSTRUMENTS 375A CD 4 pP MFG CODE 04492 MFG P N 2110 0065 Change F1 to 2110 0296 FUSE FOR 220 240V INSTRUMENTS 20A CD 3 CODE 28480 MFG P N 2110 0296 ue Page 8 75 Figure 8 34 A4 Transmitter Board Schematic Diagram sheet 2 of 2 Change the following diode values CR15 change to 16 2V CR25 change to 5 62V CR23 change to 16 2V CR7 change to 16 2V 7 13 Manual Changes Model 4935A NOTE FLEX CIRCUIT h 04935 60005 LENA 24 ENG SOLDERED TO JI is C fc R C R lt d 2 3 5 R RI 7 R ME 2 6 3 4 7 PE HE j TSINK x C c 14 8 RI C 5 C r 0 Jd 6 e U sj E un Z 4
273. 4 1200 0638 0410 1180 0410 1866 0410 1327 1200 0666 1251 6856 6 37 Replaceable Parts 6 38 P Part eference umber esignator 04935 00002 04935 00007 04935 60009 04935 600 04935 60019 04935 90018 04935 90023 0340 0949 0370 1089 0370 1091 0403 0294 0460 0880 0460 1601 0590 0076 1258 0141 1400 0510 1400 1076 1420 0284 1420 0284 1420 0285 1510 0076 1540 0835 2110 0012 2110 0004 2200 0143 2200 0521 2260 0012 2360 0117 2380 0370 2420 0023 2510 0103 2520 0014 2950 0043 2950 0087 3050 0001 3050 0067 3050 0100 3050 1114 5040 4467 5040 4468 5040 4469 5040 4470 5040 4471 5041 0750 5060 7159 7120 1155 7120 2388 7120 4184 7120 5370 7205 0356 8120 3126 8120 1521 8120 3126 OU 0 OA O U 60 Model 4935 fr Part Qty Description umber MISC AND CHASSIS PARTS 1 SHIELD ALUM 04935 00002 1 BATTERY INSULATOR 04935 00007 1 CABLE ASSEMBLY COAX 04935 60009 1 BATTERY ASSY OPT 001 amp 003 04935 6001 1 2 CABLE SHIELDED 04935 60019 1 INSTRUCTION SUMMARY CARD 04935 90018 1 OPERATING
274. 4 5 A14C6 14 7 14 8 14 9 14 10 14 11 A14C12 14 13 14 14 A14C15 A14C16 14 17 14 20 14 21 A14C22 A14C23 A14C24 A14C25 A14C26 A14C27 14 28 14 29 14 A14C31 A14C32 A14C33 A14C34 A14C35 14 36 A14C37 A14C38 A14C39 14 40 14 41 14 42 14 43 14 44 A14C45 14 46 14 47 A14C48 14 49 14 50 A14C51 14 52 A14C53 A14C54 14 55 14 56 14 57 A14C58 A14C59 A14C60 14 61 At4C62 A14C63 A14C64 A14C65 14 67 14 68 14 69 14 70 14 71 14 72 14 73 Table 6 3 Replaceable Parts Continued 04935 60307 0160 3963 0160 3963 0160 3963 0160 0576 0180 3045 0180 2945 0160 0576 0160 0576 0160 0576 0160 0576 0180 3045 0180 2945 0160 3456 0160 0576 0180 3044 0160 0576 0160 0576 0160 3456 0160 0576 0160 0576 0160 0576 0160 2257 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0180 3050 0160 0576 D Q Qro 0160 0576 5 0160 0576 5 0160 0576 5 0180 0058 0 0160 0576 5 0160 0576 0160 0576 0160 3094 0180 0576 0160 0576 0160 3291 0160 3291 0160 0576 0160 0576 0160 0576 4 0160 0576 0160 0576 0160 0576 0180 0576 0160 0576 0160 0576 0160 0576 0160 0127 0180 3124 0160 4135 0160 4135 0160
275. 4135 0160 0576 0160 0576 0180 0197 0180 0197 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0127 0180 0374 0180 1746 0160 4833 introduction to this section for ordering information Description TRANSMITTER BOARD WITH PAR CAPACITOR FIXED 15UF 5 50VDC CAPACITOR FIXED 15UF 5 50VDC CAPACITOR FIXED 15UF 5 CAPACITOR FXD 10 20 CER CAPACITOR FXD 2200UF 50 10 25VDC AL CAPACITOR FXD 1000 50 10 35VDC AL CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 2200UF 50 1096 25VDC AL CAPACITOR FXD 100UF 50 10 35VDC AL CAPACITOR FXD 1000PF 1096 1KVDC CER CAPACITOR F XD 1UF 20 50VDC CER CAPACITOR FXD 3300UF 450 1095 16VDC AL CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1000PF 10 1 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 10PF 5 500VDC CER0 80 CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOH FXD 20 50VDC CER CAPACITOR FXD 330UF 50 10 16VDC AL CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPA
276. 44 1826 0667 8 AMP LOW BIAS H IMPD DIP P PKG LF351N A13U45 1926 0667 8 IC OP AMP LOW BIAS H IMPD 8 DIP P PKG LF351N A13U46 1826 0712 4 AMP LOW BIAS H IMPD DUAL 8 DIP P LF353N A13U47 1826 1422 5 1 IC AMP WB QUAD 14 PKG MC34084P A13U48 1826 1544 8 iC OP AMP GP B DIP P PKG MC34081P A13U50 1826 0740 8 IC SWITCH ANLG DUAL 16 DIP C PKG iH5043CDE A13U51 1826 0753 B IC OP AMP LOW BIAS H IMPD SC77968L 1 13052 1826 1544 8 IC OP AMP GP 8 DIP PKG MC 34081P A13U53 1826 0665 6 IC OP AMP LOW BIAS H IMP QUAD 14 DIP P LF347BN A13U54 1926 0712 4 IC OP AMP LOW BIAS H IMP QUAL 8 DIP P LF353N A13U55 1826 0735 1 IC OP AMP H SLEW RATE B DIP P PKG HA3 2507 5 A13U56 1826 0667 8 IC OP AMP LOW BIAS H IMPD B DIP P PKG LF351N A13U57 1826 1189 1 1 IC AMP LOW BIAS H IMP 1826 1189 At3UX7 1200 0473 8 SOCKET IC 16 CONT DIP DIP SLDR 1200 0473 A13UXB 1200 0473 B SOCKET IC 16 CONT DIP DIP SLDR 1200 0473 A13UX17 1200 0473 8 SOCKET IC 16 CONT DIP DIP SLDR 1200 0473 13 MISCELLANEOUS PARTS 2260 0002 6 2 NUT HEX DBL CHAM 4 40 THD 062 IN THK ORDER BY DESCRIPTION 2260 0009 8 2 NUT HEX W LKWR 4 40 THD 094 IN THK ORDER BY DESCRIPTION 8150 0456 7 1 WIRE 24AWG W 300B PVC 7X32 80C 8150 0456 0380 1157 6 2 SNAP IN SPACER TCBS 4N 7 66 see introduction to this section for ordering information Indicates factory selected value Model 4935A Reference Designator 14 14 1 14 2 A14C3 14 4 1
277. 467 4 SPACER LONG PLASTIC 5040 4468 1 COVER FRONT 5040 4469 1 HANDLE CASE 5040 4470 2 FOOT REAR 5040 4471 1 HALF 5040 4475 1 CASE BOTTOM HALF 5040 4476 4 FOOT BUMPER 5041 6750 1 PWR CORD STRAP ASSY 5060 7159 1 LABEL WARNING 7120 1155 1 PLATE IDENT 7120 2388 1 LABEL CAP COVER 7120 4184 2 LABEL INFO HANDLE 7120 5370 1 SUPPORT ROD 7205 0356 1 CABLE REC TRAN INTERCONNECT 8120 3126 1 CABLE ASSY 18AWG 3 CNDCT 8120 1521 1 JUMPER CABLE ASSY 8120 3126 C ET S of 5 i Ac fai Pow c Sce introduction to this section for ordering information Indicates factory selected value Manual Changes Model 4954A SECTION VII MANUAL CHANGES 7 1 INTRODUCTION 7 2 This section contains information to backdate this manual for instreuments with serial prefix numbers lower than the serial prefix listed on the title page 7 3 MANUAL CHANGES 7 4 Using the information provided this manual can be corrected so that it applies to any version or configuration of the 4935A adapt this manual to an earlier instrument refer to Table 7 1 and make all of the manual backdating changes listed opposite your instrument serial prefix number Changes are listed in serial prefix order 7 5 If your instrument s serial number or prcfix number is not listed on the title page of this man
278. 47 1251 6947 125 6947 1251 6947 1251 6947 CA3140AT MC14538BCP MC14538BCP CD401 3AF CD401 3AF 1820 2472 MM74C154N 1826 0728 MC14536BCP CD4042BE CD4042BE MM74C240N 1826 0728 14001 1401 1BCL MC14011BCL CD4013AF MC14011BCL MC14012BCP LF351N MM74HCU04N MC353N LM339N CD4042BE CD4042BE CD4042BE CD4042BE CD4042BE SN57246N 0561 0 SN74LS283N SN74LS283N SN74LS283N SN74LS283N P Y Sh AD7502JN HA3 2507 5 6 21 Replaceable Parts porno 2 fr fr Part signator Qty Description ode umber 1826 1071 OP AMP 28480 1826 1071 1818 1574 IC NMOS 32768 32K ROM 450 NS 3 5 55576 SYP2332 MASKED 1820 1730 IC FF TTL LSD TYPE WS EDGE TRIG 01295 SN74LS273N 1820 1195 IC FF TTL LS POS EDGE TRIG COM 01295 SN74SL175N 1820 1730 IC FF TTL LS D TYPE POS EDGE TRIG COM 01295 SN74LS273N 1820 1 730 IC FF TTL LS D TYPE POS EDGE TRIG COM 01295 SN74LS273N 1820 1112 FF TTL LS D TYPE POS EDGE TRIG 01295 SN74LS74AN 1820 1 199 IC INV TTL LS HEX I INP 01295 SN74LSO4N 1820 1112 IC FF TTL LS D TYPE POS EDGE TRIG 01295 SN74LS74AN 1826 0735 OP H SLEW RATE 8 DIP P PKG 34371 HA3 2507 5 1826 0735 IC OP AMP H SLEW PATE 8 DIP P PKG 34371 HA3 2507 5 0654 SOCKET IC 40 CONT DIP SLDR 26460 1200 0654 A4XU32 1200 0638 SOCKET IC 14 PIN 28480 1200 0638 A4Y1 0410 1180 CRYSTAL 4 000MHZ 26480 0410 1180 A4Y3 0410 1327 CRYSTAL 4 1984304MHZ 28480 0410 1327 A4 MISCELLANEOUS PARTS 0360 0124 CONNECTOR
279. 472 IC MICROPROCESSOR MK3872 28480 1820 2472 1407 1820 1827 IC DCDR CMOS 4 TO 16 LINE 27014 74 154 A14UB 1826 0728 IC PRECISION GEN PURPOSE REG 28480 561532 1409 1826 0411 IC TIMER CMOS 04713 MC 14536BCP A14U10 1826 0411 IC TIMER CMOS 04713 MC14536BCP A14U11 1820 1956 IC QUAD LCH CMOS COM CLOCK 0192B CD4042BE 14012 1820 1956 IC QUAD LCH CMOS COM CLOCK 01928 CD4042BE A14U13 1820 2566 IC BFR CMOS QUAD LINE DRIVER 27014 MM 74C240N A14U14 1826 0728 IC PRECISION GEN PURPOSE REG 28480 561532 A14U15 1820 1745 IC QUAD NOR GATE CMOS 2 INPUT 04713 MC14001BCP 14016 1820 2576 IC QUAD CMOS 2 INPUT 04713 MC14011BCL A14U17 1820 2576 IC QUAD NAND GATE CMOS 2 INPUT 04713 MC14011BCL A14U18 1820 0939 IC FF CMOS D TYPE DUAL 0192B 401 A14U19 1820 2576 IC QUAD NAND GATE CMOS 2 INPUT 04713 MC14011BCL 14020 1820 1960 IC DUAL NAND GATE CMOS 4 INPUT 04713 14012 A14U21 1826 0667 OP AMP LOW BIAS H IMPD 27014 LF351N A14U22 1820 1977 3 IC ECL OSCILLATOR 04713 MC12061P A14U23 1820 1977 3 IC ECL OSCILLATOR 04713 MC12061P A14U24 1826 0712 4 IC OP AMP LOW BIAS H IMPD 27014 LF353N 14025 1826 0138 8 IC GP QUAD COMPARATOR 14 PIN DIP 01295 LM339N A14U26 1820 1956 IC QUAD LCH CMOS COM CLOCK 01928 CD4042BE A14U27 1820 1956 IC QUAD LCH CMOS COM CLOCK 0192B CD4042BE 14028 1820 1956 IC QUAD LCH CMOS COM CLOCK 01928 CD4042BE 14029 1820 1956 IC QUAD LCH CMOS COM CLOCK 01928 CD4042BE A141 30
280. 4807 0160 4807 0160 4807 0160 6623 0160 6623 0180 3050 0160 6623 0160 6623 0160 6623 0160 6623 30D506G025CC2 0160 3084 0160 6623 0160 6623 0160 7099 0160 7099 0180 6623 0160 6623 0160 6623 0160 6623 0160 0127 0180 T02710 0160 6595 0160 6595 0160 6595 0160 6623 0160 6623 1500225 8020 2 1500225 9020 2 0160 8623 0160 6623 0160 6623 0160 0127 150D 106X9020B2 0180 1746 0180 4833 0160 4835 0180 0291 0160 6500 0180 8500 0160 6500 0160 6500 0160 6500 0160 6500 0160 6500 6 33 Replaceable Parts P Part eference Bestgnator umber A14C83 0160 6500 A14C84 0160 6500 14 85 0160 6500 14 86 0160 6500 14 87 0160 6500 14 88 0160 6500 14 89 0160 6500 A14C90 0160 6500 14 91 0160 6500 14 92 0160 6500 14 93 0160 6500 14 94 0160 6500 14 95 0160 6500 A14C96 0160 6500 14 97 0160 6500 A14C98 0160 6500 14 99 0160 6500 14 100 0160 6500 14 101 0160 6500 At4C102 0160 6500 A14C103 0160 6500 14 104 0160 6500 14 105 0160 6500 14 106 0160 6500 14 107 0160 6500 A14C109 0160 6623 A14CH1 1902 0041 A14CR4 1901 0033 A14CR6 1901 0731 A14CR7 1902 1399 A14CR9 A14CH10 1901 0731 1901 0731 A14CR11 1901 0731 A14CR12 1901 0731 A14CR13 1901 0033 14 14 1901 0033 14
281. 4C72 HP Part No 0180 1746 CAPACITOR 15 20V Change A14 board number to HP Part No 04935 60007 Page 6 33 Table 6 3 Replaceable Parts List A14 Transmitter Board Change AI4R70 to HP Part No 0757 0420 RESISTOR 750 OHM 1 Page 6 34 Table 6 3 Replaceable Parts List A14 Transmitter Board Delete HP Part No 1251 6947 CONNECTOR SNGL CONT PIN Add HP Part No 1251 6857 CONNECTOR 2 PIN POST TYPE Add HP Part No 1251 4259 TEST PIN Add HP Part No 1200 0564 SOCKET 8 PIN Change U42 to HP Part No 1826 0735 IC OP Pages 8 82 85 14 A4 Transmitter Boards Add PC board number 04935 60003 Add PC board number 04935 60007 Delete PC board number 04935 60103 Delete PC board number 04935 60107 Model 4935A Manual Changes CHANGE 4 Page 6 13 Table 6 3 Replaceable Parts Change A3R50 to HP Part No 0757 0159 RESISTOR 1K 1 Page 6 17 Table 6 3 Replaceable Parts Delete A4C73 HP Part No 0160 4833 CAPACITOR 022 10 Delete A4C74 HP Part 0160 4835 CAPACITOR 1 aF 210 Delete 4 75 HP Part No 0180 0291 CAPACITOR 1 109 Page 6 18 Table 6 3 Replaceable Parts Change A4R36 to HP Part No 0757 0280 RESISTOR 1K 1 Page 6 31 Table 6 3 Replaceable Parts Delete A14C73 HP Part No 0160 4833 CAPACITOR 022 uF 107 Delete 14 74 HP Part No 0160 4835 CAPACITOR 10 Delete 14 75 HP Part No 0180 0291 CAPACITOR 1 10 Page 6 32 Tabl
282. 5 x 1000 V 14V EE 0 Service rong M P e lt lt a n A ass NOTES 1 REFERENCE DESIGNATION WITHIN THIS ASSEMBLY ARE ABBREVIATED ADD ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTION 2 UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE IN MICROFARADS INDUCTANCE IN MICROHENRIES 3 ASTERISK INDICATES FACTORY SELECTED COMPONENT AVERAGE VALUE SHOWN 4 UNLESS OTHERWISE INDICATED ALL GROUNDS ARE DIGITAL GROUNDS IMPULSE NOISE DETECTORS CL CIRCUIT APPLIES TO STANDARD UNITS ONLY C CIRCUIT APPLIES TO PVAR UNITS ONLY 5V R11 R9 2140 2150 P jan 1 2 MPNH 5 6190 IMPNM 28 2 e 13 TO A14 TRANSMITTER ASSY R6 6190 1 14 Sm PEE 5 1354 TE Figure 8 33 A3 Receiver Board Schematic Diagram Sheet 4 of 4 8 81 x 2042207 62 8 4 3 ben 0 498 3 2 0 oen 8 5 1 9 998 Ho 3 640 95 Sh lid 5 3 BHD 3 820 a ca ezn 5 5 5 0 182 23 5 a 2 0 n 909 2 0 eg W ea 922 5 8 3 sen 5 9
283. 50 CONNECTOR SGL CONT O25IN BSC SZSQ CONNECTOR 18 PINM POST TYPE CONNECTOR PC EDGE 25 CONT ROW 2 ROWS CONNECTOR SGL CONT 025IN BSC SZSQ CONNECTOR SGL CONT PIN 025 BSC SZSQ JUMPER REMOVABLE FOR SQ PINS CONNECTOR SGL CONT PIN O25IN BSC SZSQ JUMPER REMOVABLE FOR 0251 SC PINS CONNECTOR SGL CONT PIN 025 BSC SZSQ JUMPER REMOVABLE FOR 025IN SQ PINS CONNECTOR SGL CONT PIN 025IN BSC SZSQ JUMPER REMOVABLE FOR 025lN SQ PINS CONNECTOR SGL CONT PIN 025IN BSC SZSQ JUMPER REMOVABLE FOR 025IN SQ PINS RESISTOR 0 OHMS RESISTOR 0 OHMS RESISTOR 0 OHMS TRANSISTOR PNP PD 50W FT 20MHZ TRANSISTOR NPN S1PD 625MW FT 50MHZ TRANSISTOR PNP PD 50W 20MHZ TRANSISTOR PNP 50 20MHZ TRANSISTOR PNP SI 39 PD TRANSISTOR NPN 2N2218 SI TO 5 800MW TRANSISTOR PNP SI PD 310MW FT 250MHZ See introduction to this section for ordering information Indicates factory selected value Replaceable Parts 0160 6500 01666500 0160 6500 0160 6500 0160 6500 0160 6500 0160 6500 0160 6500 0160 6500 0160 6500 0160 8500 0160 6500 0160 6500 0160 6500 01606623 125 i 6947 1902 0041 1902 0033 1901 0731 IN5248 1901 0731 1901 0731 190 0731 1901 0731 1901 0033 1901 0033 INS248 1901 0731 1901 0731 1901 0731 1901 0033 1901 0033 INS248 T2500B 0016 1135 1901 0731 1901 0033 1901 0033 1901 0202 1902 0202 1251 6947 1251 6947 12516856 1251 4573 1251 6947
284. 50VDC CER 0160 0576 A13C135 0160 6320 CAPACITOR FXD 1700PF 4 1 10VDC MICA HP204751PF3C1 A13C136 0160 6320 CAPACITOR FXD 1700PF 190 100VDC MICA HP204751PF 3C1 A13C137 0160 6320 CAPACITOR FXD 1700PF 1 100VDC MICA HP204751PF3C1 A13C139 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0578 13 140 0160 0576 1UF 20 50VDC CER 0160 0576 13 141 0160 6405 CAPACITOR FXD 01UF 1 VDC MICA HP204751PF3C1 A13C142 0160 0576 CAPACITOR FXD 1UF 2090 50VDC CER 0160 13 143 0160 0576 CAPACITOR FXD 1UF 20 50VDC 0160 076 13 144 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 13 145 0160 0576 CAPACITOR FXD 1UF 4 2096 CER 0160 0576 A13C146 0160 6405 CAPACITOR FXD 01UF 1 100VDC MICA HP204751PF3C1 A13C147 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A13C148 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 See introduction to this section for ordering information Indicates Factory selected valuc 7 61 Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued Reference HP Part Mfr Part Designator Number Description Number CAPACITOR FXD 1700 1 100VDC MICA 08113 HP204751PF 3C1 A13C149 0160 6320 A13C150 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 13 151 0160 6320 CAPACITOR FXD 1700 1 100VDC MICA 08113 HP204751PF3C1 A13C152 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C153 0160 0576 C
285. 53 55 12 3 5 3 res 9 8 in rd 585 20 12 162 LH 082 641 2 692 1 idl 2 2 8922 SH Sdi co 180 2 3 541 tO guo Pdl 9 8 2 0 522 vd 9 B PIH 52 9 8 ca eig UH z a r8 182 90 5 8 i B 082 cozy 1 8 BH za 525 1 8 gu Lg 8 2 9 LOY 1 19 16 115 i8 95 92 Sy 0 78 63 8 8 1 3 2 2 t2 LB 12 665 98 9 amp 2 2 9 86H 98 bes 2 9 182 2 9 268 9 0 10 2 9 2 0 96H CH 90 92 9 0 50 t 9 9 8 2 42 252 268 8 8 tH 952 LH 9 8 eo 8 H 550 8 8 10 019 SO r H id r 555 18H 8 4 9 255 H 5 9 E H 64H rq t iA E H r a 3 2 3 iH 44H 9 5 rior t3 S z 9 esn rH 84H 8 3 enc 729 1 3 snr 0 en 9 3 5 3 ard c5 ern 8 3 ty inr 5 3 9co 9 5 n 2 3 bJ er 522 9 5 orn 4 sa zr PED 5 9 Sv p d beg 552 5 9 ven 595 52 eco 5 9 rd 89H 8 3 0 120 9 198 IH 2 9 99H 8 0 625 own 2 5 5 0 geo 1 3 sen
286. 546 C4 1 8 T0 5111 F A14R45 0757 0442 RESISTOR 10K 1 125W F TC 0 100 24546 C4 1 8 T0 1002 F 14846 0757 0458 RESISTOR 51 1K 1 125W TC 0 100 24546 4 1 8 0 5112 14847 0698 3156 RESISTOR 14 7K 1 125W 0 100 24546 C4 1 8 TO 1472 F A14R48 0698 3152 RESISTOR 3 48K 1 125W TC 0 100 24546 C4 1 8 T0 3481 F 14849 0757 0458 RESISTOR 51 1K 1 125W 0 100 24546 4 1 8 0 8112 14852 0757 0442 RESISTOR 10K 1 125W 0 100 24546 C4 1 8 T0 1002 F A14R53 0698 3160 RESISTOR 31 6K 196 125W TC 0 100 24546 4 1 8 0 3162 14854 0757 0442 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 14855 0698 3160 RESISTOR 31 6K 1 125W 0 100 24546 C4 1 8 T0 3162 F A14R56 0757 0280 RESISTOR 1K 1 125W 0 100 24546 C4 1 8 T0 1001 F A14R57 0757 0458 RESISTOR 51 1K 1 125W 0 100 24546 C4 1 8 T0 5112 F A14R58 0698 3451 RESISTOR 133K 1 125W 0 100 24546 C4 1 8 T0 1333 F A14R59 0757 0442 RESISTOR 10K 1 125W TC 0 100 24546 C4 1 8 T0 1002 F 14860 0757 0442 RESISTOR 10K 1 125W TC 0 100 24546 4 1 8 0 1002 14861 0698 3160 RESISTOR 31 6K 1 125W TC 0 100 24546 4 1 8 0 3162 14862 0698 3160 RESISTOR 31 6 1 125W 0 100 24546 4 1 8 0 3162 14863 0757 0442 RESISTOR 10K 1 125W TC 0 100 24546 C4 1 8 T0 1002 F At4R64 0698 3160 RESISTOR 31 6K 1 125W TC 0 100 24546 4 1 8 T0 3162 F 14865 0757 0421 RESISTOR 825 1
287. 576 13 110 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A13C111 0140 0235 CAPACITOR FXD 2250PF 4 196 300VDC MICA DM20F2250RF0300WV1C A13C112 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A13C113 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A13C114 0140 0228 CAPACITOR FXD 3600PF 4 196 300VDC MICA HP204751PF3C1 A13C115 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A13C116 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A13C117 0160 0576 CAPACITOR FXD 1UF 2096 50VDC CER 0160 0576 A13C118 0160 6405 CAPACITOR FXD 01UF 4 196 100VDC MICA HP204751PF3C1 A13C119 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 13 120 0160 6405 CAPACITOR FXD 01UF 1 100VDC MICA HP204751PF3C1 A13C121 0160 6320 CAPACTOR FXD 1700PF 1 100VDC MICA HP204751PF3C1 13 122 0160 6318 CAPACITOR FXD 1100 1 500VDC MICA G02044751PF3C1 13 123 0160 3291 CAPACITOR FXD 1200PF 1 100VDC MICA 0160 3291 A13C124 0160 0218 CAPACITOR FXD 2400PF 4 196 300VDC MICA 0160 0218 A13C125 0160 6320 CAPACITOR FXD 1700PF 4 196 100VDC MICA HP204751PF3C1 A13C126 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 13 127 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 13 131 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A13C132 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A13C133 0180 0374 CAPACITOR FXD 10UF 10 20VDC 1500106 902082 13 134 0160 0576 CAPACITOR FXD 1UF 20
288. 59 8 8 10 015 PH 288 ey eso 8 4 eso H CAT 975 H Bid ra EAT tH r a LAP rr e3 esn LH sinn 3 tro G 5 256 fH 94H 8d ear evo osn 4 La enr i2 Do SH viH 9 3 enr 075 8 i L9 ern e tar 5 3 8 9 195 2 4 3 er sco 59 orn 4 50 er vCO 5 9 9 3 ey ir td 5 5 596 52 1 3 e 5 896 3 3 zen 2m 185 4 B 8 9 v d 2 3 6280 62D i own 2 3 2282 0 szo m s bd gen 2 2 ec 1289 3 7 9 3 zen 3 5 9 2 93 gen 5 3 5 3 225 X sen 19e i 22121 5 2 ren 9 5 ozo i T i 449 E m 1 e r 3 zen St 5143 42 9 2 i 1 3 ocn SH 9 2 TS 55 pot i gvn B 4 ss n dd e 2155 eu ha 00 07070700070 SEES NE 922 rz T i a i 1 omo eee CE TAE AR 250795 H 9 4 3 a 9 lt lt lt K
289. 59 NE NAVAT S 9 ZI 33431 119100 GMDOS5 21 104 73 1 iDdinO 30 235 adOadhS 01 3311 3592 iis 310N QNYM 121 3 2 31 2422 38 A38 120109 lt 6 725 0 42 4 27 Mn oan lt 455 names f i 41135 2 2 EV s ASST 7 B3l1i SM 25 4 e bep Z ie o T T 1 vx pio 10 455 Qi T3NYd lt 8 1 t t 1 j 8 27790 Qd 4 ASSY M3llImSNVHI bY id Ofd 100100 assy WALLIMSAYMI pY 01 9 F oe 2 _____ 2 6 85 NOTld182S30 31319902 0 2 5 x m m Y x x x i Id Lv aoe ee Ora ee ps lt A 28 01 23S A 35 557 lt LAX le Io 55 ws NI TY v i 0 v 006 tdi 1 7009 TIE H ui n 2 j B i Y HSNe bsa Z O SNi
290. 5mV at 25 Ad just AJ3RO6S ORMS DET until the display lickers between 90 and 91 dBrn There are problems that could go undetected using only Voltmeter The following test is intended quick check to verify that the instrument basically works Attach a scope probe to A3ITP23 full wave rectificcl output On 4935A select DISPLAY MEASUREMENT LEVEL FREQ Vary the OUTPUT LEVEL from 0 dBm to 2 0 dBm starting at Q and finishing at 2 9 The waveform at A3TP23 should be a full wave rectified sinewave with the peaks within 50 mV of cach other On the 4935A press DISPLAY to change from TRMT to Adjust the AC Calibrator to 2 45 dBm at KHz A rectificcl sinewave should appear On the 4935A change LEVEL FREQUENCY to NOISE Try cach filter and verify in cach case that rectificd sinewave appears at A3TP23 with visual distortion Check the notch filter capacitors A3C92 00 and 4 1 they must lean away from the switch board they pick up noise when too close Bentl the capacitors away from the switch board if necessary Model 4935A Adjustment Calibration ADJUSTMENTS 5 17 Notch Filter Adjustments REFERENCE Receiver Assembly EQUIPMENT Oscilloscope 1741 PROCEDURE 10 11 1 13 Externally loop the TRMT jack to the RCV jack On 1935A select DISPLAY TRMT MEASUREMENT LEVEL FREQUENCY
291. 6 A2 Switchboard Component Locator Replace with Figure 7 1 Page 8 86 Battery Charger Board Component Locator Replace with Figure 7 2 Page 8 87 A5 Battery Charger Board Schematic Replace with partial schematic shown in Figure 7 3 CHANGE 2 Page 6 18 Table 6 3 Replaceable Parts A4 Transmitter Board Add A4JW5 HP Part No 5020 5252 WIRE Add A4JW6 HP Part No 5020 5252 WIRE Page 6 32 Table 6 3 Replaceable Parts A14 Transmitter Board Add A14JW5 HP Part No 5020 5252 WIRE Add A14JW6 HP Part No 5020 5252 WIRE Page 8 82 83 A14 and A4 Transmitter Board Component Locators Replace with Figure 7 4 Page 8 84 14 and A4 Transmitter Board Assembly Schematics Modify as shown in Figure 7 5 CHANGE 3 Page 6 17 Table 6 3 Replaceable Parts List A4 Transmitter Board Delete 4672 HP Part No 0180 1746 CAPACITOR 15 20V Change A4 TRANSMITTER BOARD to HP Part No 04935 60003 Page 6 19 Table 6 3 Replaceable Parts List A4 Transmitter Board Change A4R70 to HP Part No 0757 0421 RESISTOR 823 OHM 1 Page 6 20 Table 6 3 Replaceable Parts List A14 Transmitter Board Delete HP Part No 1251 6947 CONNECTOR SNGL CONT PIN Add HP Part No 1251 6857 CONNECTOR 2 PIN POST TYPE Add HP Part No 1251 4259 TEST PIN Add HP Part No 1200 0564 SOCKET 8 PIN Change A4U42 to HP Part No 1826 0735 IC OP AMP Page 6 31 Table 6 3 Replaceable Parts List A14 Transmitter Board Delete A1
292. 6 0138 1820 1956 1820 1956 1820 1956 1820 1956 D O COCCO W OWO 00 wonwwom OOOOO Qty Description RESISTOR 31 6 1 125W TC 0 100 RESISTOR 1 62 196 125W RESISTOR 2 43K 1 125W RESISTOR 2 5k 1 125W TC 04 100 RESISTOR585 196 125W TC 0 100 RESISTOR 31 6 1 125W TC 0 100 RESISTOR 1M 1 125W F 0 RESISTOR 10K 196 125WF TC 0 1 RESISTOR 51 1 1 125 TC 0 100 RESISTOR 10K 1 125W 04 25 RESISTOR 196 RESISTORS 57 RESISTOR 19 6K 1 125W RESISTOR 1 62 1 125W RESISTOR 1K 1 125W RESISTOR 1M 1 125W F TC 0 100 RESISTOR 0 OHMS RESISTOR 0 OHMS FOR FURTHER USE RESISTOR 0 OHMS RESISTOR 0 OHMS FOR FURTHER USE CONNECTR SGL CONT PIN 025 IN BSC SZ SO TRANSFORMER AUDIO TEST PIN 025 IN BSC SZ SO TEST PIN 025 IN BSC SZ 50 TEST PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN ESC SZ SQ CONNECTR SGL CONT PIN 025IN ESC SZ SQ CONNECTR SGL PIN 025 IN BSC SZ CONNECTR SGL PIN 025 IN BSC SZ CONNECTR SGL PIN 025 IN BSC SZ CONNECTR SGL PIN 025 IN BSC SZ CONNECTR SGL PIN 025 IN BSC SZ CONNECTR SGL CONT PIN 025 IN BSC SZ 50 OP AMP LOW BIAS H IMPD TO 99 PKG IC MV CMOS MONOSTBL RETRIG RESET DUAL IC MV CMOS MONOSTEL RETRI RESET DUAL IC FF CMOS D TYPE POS EDGE 1 RIG DUAL FF CMOS D TYPE POS EDGE TRIG DUAL MICROPROCESSOR 3872
293. 6 1 MICA CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 10UF 10 20VDC TA CAPACITOR FXD 1UF 2096 CER CAPACITOR FXD 1700PF 4 196 10VDC MICA CAPACITOR FXD 1700PF 196 100VDC MICA CAPACITOR FXD 1700PF 1 100VDC MICA CAPACITOR FXD 1UF 2096 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 01UF 1 MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 01UF 1 100VDC MICA CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 1UF 2096 CER CAPACITOR FXD 1700PF 4 196 100VDC MICA CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 1700PF 4 196 100VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 750PF 5 300VDC MICA See introduction to this section for ordering information ndicates factory selected value Replaceable Parts fr Part umber 0160 6623 0160 6623 0160 7102 0160 6818 0160 5877 0160 7089 0160 6623 0160 5877 0160 7100 0160 7100 0160 6623 0160 6539 0160 6623 0160 6823 0160 6539 0160 6623
294. 6360 0698 8360 0699 0588 LP DOC NDOOR NOOUHM PDWALAO 0000 oooo Description RESISTOR 9 76K 1 125W F TC 0 100 RESISTOR 1 111K 1 125W 0 100 RESISTOR 10K 1 125WF TC 0 25 RESISTOR 1 1 125W RESISTOR 1 96 19 125W RESISTOR 301K 1 5W F TC 0 100 RESISTOR 301K 1 5W F TC 0 100 RESISTOR 196K 1 125W TC 0 100 RESISTOR 100 1 125W F TC 0 100 RESISTOR 5 11K 1 125W F 0 100 RESISTOR 4 64K 1 125W F TC 0 100 RESISTOR 21 5K 1 125W F TC 0 100 RESISTOR 10K 1 125W F 0 25 RESISTOR 1 33K 1 125W 24546 RESISTOR 1 33 1 125W 24546 RESISTOR 10K 1 125WF TC 0 100 RESISTOR TRMR 2K 10 C TOP ADJ 17 TRM 1 RESTO 125WF G 0 100 W F TC 0 100 RESISTOR 12 1 1 155 F TG 0 100 1K RESISTER 21 5K 125W F TC 0 RESISTOR 750 1 125W TC ds RESISTOR 19 6 196 Kr TC 0 100 RESISTOR 750 1 125W F TC 04 100 RESISTOR 1K 1 125W TC 0 100 RESISTOR 2 37K 1 125W RESISTOR 2 37 1 125W RESISTOR 1 21K 1 125W TC 0 100 RESISTOR 2 15K 1 125W TC 0 100 RESISTOR TRMR 500 10 C TOP ADJ 17 TRN RESISTOR 100K 196 125W TC 01 100 RESISTOR 232K 196 125W TC 0 100 RESISTOR 365K 1 125W TC 0 25 RESISTOR 134K 1 125W F TC 0 100 RESISTOR 113K 1 125W TC 0 100 RESISTOR 100K 1 125W TC 0 50 R
295. 6947 9100 2647 TRANSFORMER AUDIO 28480 9100 2647 AATP 1 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 28480 1251 6947 AATP2 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 28480 1251 6947 4 1251 6947 0 CONNECTR SGI CONT PIN 025 IN BSC SZ SQ 28480 1251 6947 4 4 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 28480 1251 6947 4 5 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 28480 1251 6947 4 6 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 28480 1251 6947 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 28480 1251 6947 4 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 28490 1251 6947 AATPS 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC S2 SQ 28480 1251 6947 A4TP10 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 28480 1251 6947 AATP11 1251 6947 0 CONNEC R SGL CONT PIN 025 IN BSC SZ SQ 28480 1251 6947 A4U1 1826 0679 2 1 IC OP AMP LOW BIAS H IMPD TO 99 PKG 0192B 140 41 2 1820 1932 0 2 IC CMOS MONOSTBL RETRIG RESET DUAL 04713 MC14538BCP A4U3 1820 1932 0 IC MV CMOS MONOSTBL RETRIG RESET DUAL 04713 MC14538BCP AAUA 1820 0939 5 3 IC FF CMOS D TYPE POS EDGE TRIG DUAL 0192B CD4013AF A4U5 1820 0939 5 IC FF CMOS POS EDGE TRIG DUAL 01928 CD401 3AF 4116 1820 2472 5 1 MICROPROCESSOR 3872 28480 1820 2472 AAU 1820 1827 2 1 IC CMOS 4 T0 16 LINE 27014 MM 74C154N A4U8 1826 0728 2 2 IC PRECISION GEN PURPOSE VOLT REG 28480 1826 0728 A4U9 1826 0411 0 2 IC TIMER C
296. 7 X45H281 MPS A42 Sce introduction to this section for ordering information ndicates factory selected value 4935 esignator A14Q3 A14Q4 1405 A14Q6 A14Q7 A14R1 A14R2 A14R3 A14R4 1485 1486 A14R7 Ai4R8 A14R9 A14R10 A14R11 A14R12 A14R13 14814 A14H16 A14R17 A14H19 14820 14821 A14R22 A14R23 A14R24 A14R25 A14R27 A14R28 14829 A14R30 A14R31 14833 A14R34 A14R35 A14R36 A14R37 A14R38 A14R39 A14R40 14841 A14R42 A14R43 14844 14845 14846 14847 A14R48 14 49 14852 A14R53 A14R54 A14R55 A14R56 A14R57 A14R58 A14R59 A14R60 A14R61 A14R62 A14R63 A14R64 14865 A14R66 A14R67 A14R68 A14R69 A14R70 A14R71 14872 14873 A14R74 P Part umber 1853 0512 1853 0512 1853 0012 1854 0053 1853 0036 0757 0465 0698 6360 0757 0819 0757 0442 0698 8827 0698 8826 0698 8826 0698 8827 0698 8827 0698 8826 0698 8824 0757 0442 0757 0465 0698 6360 0698 3440 0757 0465 0757 0280 0757 0442 0757 0442 0757 0442 0757 0228 0757 0420 0757 0420 0698 0083 0757 0465 1810 0207 0757 0465 2100 3882 0757 0416 0698 0083 0757 0442 0757 0394 0757 0317 0757 0420 0757 0420 0757 0465 0757 0280 2100 3881 0757 0438 0757 0438 0757 0442 0757 0458 0698 3156 0698 3152 0757 0458 0757 0442 0698 3160 0757 0442 0698 3160 0757 0280 0757 0458 0698 3451 0757 0442 0757 0442
297. 7 0180 0291 3 CAPACITOR FXD 1UF4 19 35UDC 55289 150D105X903542 A2C10 0180 0104 7 CAPACITOR FXD 20002 75 10 16UDC AL 26289 3002076015072 A2C11 0180 2206 4 CAPACITOR FXD 60UF 10 6UDC TA 756289 150D606X9 0068 A2C12 0180 2206 4 CAPACITOR FXD 60UF 10Z AYDC TA 6289 150D606X900682 A2C13 0160 0576 s CAPACITOR FXD 1UF 20 50UDC CER 28480 0160 0576 A2C14 0160 0576 s 1UF SOVDC CER 28480 0160 0576 2015 0160 05756 5 CAPACITOR FXD 1UF 20 S0VD CER 29480 0140 0576 A2C16 0160 3878 6 CAPACITOR FXD 1000PF 20 100UDC 28480 0160 3878 A2C17 0160 0576 5 CAPACITOR FXD 1UF 20 SOUDCE CER 28480 0160 0576 2 52 0160 0576 5 CAPACITOR FXD 1UF 20 5S0UDC CER 28480 0160 0576 APCSS 0180 0373 2 CAPACITOR FXD 69UF 10 35UDC 5 652989 150D684X903542 2054 0160 3879 7 CAPACITOR FXD 01UF 20 100UDC CER 28480 0160 3879 A2C56 0160 3879 7 CAPACITOR FXD 01UF 20 100UDC CER 20480 0160 3879 A2C57 0160 0576 5 CAPACITOR FXD 20 SOVDC CER 28480 0160 0576 A2C58 0160 0576 5 CAPACITOR FXD 1UF 20 SOVDC CER 28480 0160 0576 A2C72 0160 0576 s CAPACITOR FXD 1UF 20 SOVDC CER 28480 0160 0576 2 73 0180 0373 2 CAPACITOR EXD 68UF 102Z 35UDC 562089 150D684X903542 A2C74 0160 3879 7 CAPACITOR FXD 01UF 20 100UDC CER 28480 0160 3879 2 76 0160 3879 7 CAPACITOR FXD OLUF 4 20 100UDC 20480 0160 3879 A2C77 0160 0576 5 CAPACITOR FXD 1UF 20 SOVDC CER 28480 0160 0576 A2C78 0160 0576 5 CAPA
298. 7100 CAPACITOR FXD 1700PF 1 100VDC MICA 0160 7100 0160 7100 CAPACITOR FXD 1700PF 1 100VDC MICA CAPACITOR FXD 1000PF 1 500VDC MICA 0160 7100 0160 6268 0160 6268 0160 6595 CAPACITOR FXD 4700PF 1 300VDCMICA 0160 6595 0160 6268 CAPACITOR FXD 1000PF 1 500VDC MICA 0160 6268 0180 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 0160 6623 CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 110PF 1 300VDC MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 CER 0160 6623 0160 6802 0160 6623 0160 6623 0180 6802 0160 6623 0180 6623 OOOOH ANOMH ONAN NGON QOUUO See introduction to this section for ordering information Indicates factory selected value 6 26 Model 4935 esignator 13 77 A13C78 13 79 A13C80 A13C81 A13C82 A13C83 A13C84 A13C85 A13C87 13 88 13 89 A13C90 A13C91 13 92 13 93 13 94 A13C95 A13C97 A13C98 A13C99 13 100 13 101 A13C102 A13C103 A13C104 13 105 13 106 A13C107 A13C108 A13C109 A13C110 13 111 13 112 A13C113 A13C114 A13C115 A13C116 A13C117 13 118 13 119 13 120 A13C121 13 122 13 123 A13C124 A13C125 A13C126 A13C127 13 131 13 132 13 133 A13C134 13 135 13 136 13 137 1 139 A13C140 A13C141 A13C142 A13C
299. 74LS283N A4U35 1820 1441 6 IC ADDR TTL LS BIN FULL ADDR 4 BIT 01295 SN74LS283N 4035 1820 1441 6 IC ADDR TTL LS BIN FULI ADDR 4 BIT 01295 SIN74LS283IN 4037 1820 1441 6 IC ADDR TIL LS BIN FULL ADDR 4 BIT 01295 SN74LS283N A4U 36 1820 144 6 IC ADDR TTL LS BIN FULL ADDR 4 BIT 01295 SN74LS283N A4U40 1826 0779 3 1 IC MULTIPLXR 4 CHAN ANGL DUAL 16 DIP P 24355 AD7502JN A4U41 1826 0735 1 3 IC OP AMP H SLEW RATE B DIP P PKG 34371 HA3 2507 5 AAU42 1826 1071 0 1 28480 1826 1071 A4U43 1818 1574 1 1 IC NMOS 32768 32K ROM 450 NS 3 S 55576 SYP2332 MASKED A4U44 1820 1730 6 3 FF TTL LS D TYPE POS EDGE TRIG 01295 5 7415213 4045 1820 1195 7 1 FF LS D TYPE POS EDGE TRIG COM 01295 SIN74SL175N 4046 1820 1730 6 IC FF LS D TYPE POS EDGE 1RIG COM 01295 SN74LS27 3t 4047 1820 1730 6 FF TTL LS POS EDGE TRIG COM 01295 SN74LS273N A4U48 1820 1112 8 2 IC FF TTL LS POS EDGE TRIG 01295 SN74LS74AN A4U49 1820 1199 1 1 IC INV TTI L S HEX 1 INP 01295 SN74LS04N A41J50 1B20 1112 8 IC FF TTL LS D TYPE POS EDGE TRIG 01295 SN74LS74AN A4U52 1826 0735 1 IC OP AMP H SLEW RATE 8 DIP P PKG 34371 HA3 2507 5 4053 1826 0735 1 OP AMP H SLEW RATE 8 DIP P PKG 34371 2507 5 A4XUG 1200 0654 4 1 SOCKET IC 40 CONT DIP SLDR 28480 1200 0654 4 032 1200 0638 1 1 14 PIN 28480 1200 0638 A4Y1 04 10 1180 0 1 CRYSTAI 4 000MH Z 28480 0410 1180 A4Y2 0410 1220 9 1 CRYSTAL 4 1984 304 2 28480 0410 1220
300. 757 0159 CA l a TO 1961 F 0757 0884 0757 0864 C4 1 8 TO 1963 F C4 1 8 TO 101 F C4 1 8 T0 511 C4 1 8 TO 4641 F 4 1 8 0 2152 0698 6360 CA l a TO 131 F CA l a TO 131 F C4 1 a TO 002 F 2100 3882 4 1 1002 C4 1 a TO 1962 F C4 1 8 TO 1212 F C4 1 8 TO 2152 F C4 1 8 TO 751 F C4 1 8 TO 1962 F C4 1 8 TO 751 F C4 1 8 TO 1001 1 a TO 2371 F a TO 2371 F C4 1 8 TO 1211 F C4 1 8 TO 2151 F 2100 3881 C4 1 a TO 1003 F C4 1 a TO 2323 F 0699 0585 0699 t 078 4 1 1 133 F C4 1 a TO 2942 F 4 1 8 0 2942 06860 5258 Cat 7370 1001 F MFA C1 a TQ 1 111 R B 0698 6360 0698 8638 0698 6445 0699 0586 0688 0585 0698 6467 0699 0587 0588 2100 3883 0698 6444 0698 6423 742 0690 8858 0690 8858 0698 6625 0699 0588 5558 8260 0698 6467 0699 0566 0699 0566 0698 6445 0698 8638 1 8 TO 1332 F3 0689 0589 0699 0589 it 8 6360 0699 0588 See introduction to this section for ordering information Indicates factory selected value o5 Replaceable Parts Bet rence signator A3R122 A3R123 A3R127 A3R128 A3R129 A3R132 A3R134 A3R135 A3R136 A3R137 A3R138 A3R139 A3R140 A3R141 A3R142 A3R143 A3R144 A3R145 A3R146 A3R147 A3R148 A3R149 A3R151 ARIES A3R159 A3R160 A3R161 A3R162 165 166 167 A3R178 A3R179 A3R180 A3R181 A3R182 A3R183 A3R184 A3R185
301. 757 0442 0698 3160 C4 1 8 TO 5111 F C4 1 8 TO 1002 F C4 1 8 T0 5112 F C4 1 8 T0 1472 F C4 1 8 TO 3481 F C4 1 8 TO 5112 F 64 1 8 0 1002 C4 1 8 TO 3162 F 4 1 8 0 1002 4 1 8 0 3162 0757 0280 0757 0458 0698 3451 0757 0442 0757 0442 0698 3160 0698 3160 0757 0442 0698 3160 0757 0421 0757 0442 0757 0443 0757 0441 0757 04 19 0757 0422 ES 1 8 TO 8251 F 0757 0442 2100 3881 0757 0279 2100 3882 0757 0422 0757 0442 0757 0442 0757 0180 ONONO AMOMD qQoO Q 4 ONA OG O OOO COMON Scc introduction to this section for ordering information ndicates factory selected value 6 20 Model 4935A Reference esignator A4R103 A4R104 A4R204 A4S S A4T1 4 A4TP10 AATP11 P Part umber 0757 0180 0757 0428 0757 0431 0698 0084 0698 6393 0757 0279 0698 8827 0757 0442 0757 0394 0757 0442 0698 3150 0757 0280 0698 3157 0757 0428 0757 0280 0698 8827 08 11 3587 08 1 3567 081 3587 08 11 3587 1251 6947 9100 2647 0360 0535 0360 0535 0360 0535 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1826 0679 1820 1932 1820 1932 1820 0939 1820 0939 1820 2472 820 827 1826 0728 1826 0411 1826 0411 1820 1956 1820 1956 1820 2566 1826 0728 1820 1745 1820 2576 1820 2576 1820 0939 1820 2576 1820 1960 1826 0667 1820 3008 1826 0712 182
302. 757 0465 RESISTOR 100K 1 125W 0 100 4 1 8 1003 0699 0653 RESISTOR 121 78 190 125W 0 25 0699 0653 0757 0442 RESISTOR 10K 1 125W TC 0 100 C4 1 8 TO 1002 F 0699 0591 RESISTOR 140 158 1 125W F 0 25 0699 0591 A5R13 0698 6358 RESISTOR 100K 1 125W 0 25 0698 6358 5 14 0699 0653 RESISTOR 121 78K 1 125W 0 25 0699 0653 A5R16 0699 0653 RESISTOR 121 78K 190 125W 0 25 0699 0653 A5R17 0699 0591 RESISTOR 140 15BK 190 125W 0 25 0699 0591 19 0757 0442 RESISTOR 10K 1 125W F TC 0 100 4 1 8 1002 See introduction to this section for ordering information Indicates factory selected valuc 7287 Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued Reference HP Part C Mfr Part Designator Number D Description Number 5820 0757 0984 RESISTOR 10 1 5W 100 0757 0984 A5R21 0698 3409 RESISTOR 2 37K 1 6 TC 0 100 0698 3409 A5R22 0757 0280 RESISTOR 1K 1 125W F TC 0 100 4 1 8 1001 A5R23 0698 3409 RESISTOR 2 37K 1 5W TC 0 100 0698 3409 A5R24 0698 3409 RESISTOR 2 37K 196 5W 0 100 0698 3409 A5R25 0698 3150 6 RESISTOR 2 37 1 125W F TC 0 100 4 1 8 2371 5827 0698 6360 6 RESISTOR 10K 1 125W TC 04 25 0698 6360 A5R28 0698 6360 6 RESISTOR 10K 1 125W TC 0 25 0698 6360 A5R29 0757 0442 9 R
303. 775 V 0 0 dBm into 600 ohms Adjust the 4935A threshold to 75 dBrn Press the START RESET button W ait 60 seconds and press STOP The 4935A right display should indicate 480 48 counts Press Impulse Noise DISPLAY button to select MID threshold The 4935A display should indicate 480 48 counts Press DISPLAY button in IMPULSE NOISE to select HIGH threshold The 4935A display should indicate 480 48 counts ABBREVIATED COUNT LIMIT TEST There is no abbreviated Count Jamit Test Model 4935A Performance Tests PERFORMANCE TESTS 4 20 Termination Impedance Test SETUP MODEL 4935A 310 TO BNC BNC TO DUAL BANANA AN TEST RESISTOR 9000 6000 1350 Figure 4 8 Termination Impedance Test EQUIPMENT HP 3490A Multimeter 1310 to BNC adapter 1 BNC to dual banana adaptor Resistors 9000 6000 13511 1 Disconnnect 4935A from AC power 2 Connect equipment as shown in Figure 4 8 3 4935 select POWER 3 2 woo Aes m STBY ress in simultaneousl REVY docs acus qoos peto des D y vin MM atts as OU cane eh ELT BRG out DIAL out Both HOLDs out press in RCV 9000 press in TRMT 9000 4 Measure the resistance across the transmitter and receiver jacks Both should be greater than 1M ohm a As the DC blocking capacitors charge the measured resistance may slowly rise Set the Multimeter to the lowest resistance and increase the resistance as the meter overranges 5 Set
304. 8 3153 0698 4445 0698 3152 0698 3153 RESISTOR 10K 1 125W TC 0 100 RESISTOR 5K 1 125W F TC 0 100 0757 8360 0698 6320 A13R28 A13R29 OD agomo OWOONHO oonan oc oun See introduction to this section for ordering information Indicates factory selected value Model 4935A P Part umber esignator A13R30 0757 0416 A13R31 0757 0416 A13R32 0757 0416 A13R33 2100 3883 A13R34 0757 0442 A13R35 0757 0420 A13R36 0698 4480 A13R37 0698 4480 A13R38 0757 0424 A13R39 0698 3150 OO OONNN A13R40 0757 6360 A13R42 0757 6360 A13R43 0757 0420 A13R44 0698 4480 13845 0698 4480 A13R46 0698 3155 A13R47 0698 4475 A13R48 0698 7847 A13R49 0698 6360 A13R50 0698 3409 A13R54 0698 3453 13855 0757 0401 A13R56 0757 0438 A13R57 0698 3155 13858 0757 0199 A13R60 0698 6360 A13R62 0757 0317 A13R63 0757 0317 A13R64 0757 0442 A13R65 2100 3882 A13R66 0757 0442 A13R67 0698 3157 A13R68 0757 0444 A13R69 0757 0199 A13R70 0757 0420 A13R71 0698 3157 A13R72 0757 0420 A13R72A 0757 0280 A13R73 0698 3150 A13R74 0698 3150 A13R75 0757 0274 A13R76 0698 0084 A13R77 2100 3881 A13R78 0757 0465 0698 4530 0699 0595 A13R79 A13R80
305. 8 6445 0699 0586 0699 0585 0698 6467 0699 0587 0699 0588 2100 3883 Table 6 3 Replaceable Parts Continued HP Part Number Description RESISTOR TRMR 2K 10 TOP ADJ 17 TRN RESISTOR 3 83K 1 125W F TC 0 100 RESISTOR 5 76K 1 125W F TC 0 100 RESISTOR 3 48K 1 125W F TC 0 100 RESISTOR 3 83K 1 125W F 0 100 RESISTOR 10K 1 125W F TC 0 100 RESISTOR 5K 1 125W TC 0 100 RESISTOR 511 1 125W F TC 0 100 RESISTOR 511 190 125W F TC 0 100 RESISTOR 511 1 125W F TC 0 100 RESISTOR TRMR 5K 10 C TOP ADJ 17 TRN RESISTOR 10K 1 125W F TC 0 100 RESISTOR 750 1 125W F 0 100 RESISTOR 15 8K 1 125W 0 100 RESISTOR 15 8 1 125W TC 0 100 RESISTOR 1 1K 1 125W TC 0 100 RESISTOR 2 37K 1 125W 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 750K 1 125W RESISTOR 15 8K 1 125W F TC 0 100 RESISTOR 15 8K 1 125W TC 0 100 RESISTOR 4 6K 1 125W F TC 0 100 RESISTOR 9 76 1 t25W 0 100 RESISTOR 1 111K 1 125W 0 25 RESISTOR 10K 1 125W 0 25 RESISTOR 2 37K t 125W RESISTOR 196K 1 125W TC 0 100 RESISTOR 100 1 125W 0 100 RESISTOR 5 11K 1 125W TC 0 100 RESISTOR 4 64K 1 125W TC 0 100 RESISTOR 21 5K 1 125W 0 100 RESISTOR 10K 1 125W 0 25 RESISTOR 1 33K 1 125W RESISTOR 1 33K 1 125W RESISTOR 10K 1 125W F TC 0 100 RESISTOR TRMR 2K 10 C TO
306. 8 TO 1331 F C4 1 8 TO 1331 F C4 1 8 TO 1002 F 2100 3882 C4 1 8 TO 1002 F C4 1 8 TO 1962 F 4 1 8 1212 C4 1 8 TO 2152 F C4 1 8 TO 751 F C4 1 8 TO 1962 F C4 1 8 TO 751 F C4 1 8 TO 1001F CA 1 8 TO 2371 F CA 1 8 TO 2371 F C4 1 8 TO 1211 F C4 1 8 TO 2151 F 2100 3881 C4 1 8 TO 1003 F C4 1 8 TO 2323 F RESISTOR 365K 196 125W 0 25 RESISTOR 134K 196 125 F TC 0 25 RESISTOR 113K 1 125W TC 0 100 RESISTOR 100K 1 125W F TC 0 50 RESISTOR 10K 1 125W TC 0 25 RESISTOR 100K 1 125W F TC 0 50 RESISTOR 10K 1 125W F TC 04 25 RESISTOR 29 4K 1 125W TC 0 100 RESISTOR 29 4 1 125W TC 0 100 RESISTOR 25 5K 1 25W TC 0 25 RESISTOR 25 5K 1 125W TC 0 25 RESISTOR 1K 1 125W TC 0 100 RESISTOR 1 11K 1 125W 0 25 RESISTOR 10K 1 125W 0 25 RESISTOR 3 16 1 125W F 0 25 RESISTOR 6 838 1 125W TC 0 25 RESISTOR 186 365K 125W TC 0 25 RESISTOR 240 738K 1 125W TC 0 25 RESISTOR 16 9K 1 125W TC 0 50 RESISTOR 12 918K 1 125 F TC 0 25 RESISTOR 18 171K 1 125W F TC 0 25 RESISTOR TRMR 5K 10 C TOP ADJ 17 TRN RESISTOR 21 62 25 125W TC 0 100 RESISTOR 31 25 1 125W TC 0 25 RESISTOR 12 198K 1 125W F TC 0 100 RESISTOR 12 4K 1 125W 0 25 RESISTOR 12 4K 1 125W F TC 0 25 RESISTOR 6K 1 125W F TC 0 50
307. 82 A13C3 0180 1746 5 CAPACITOR FXD 15 10 20VDC 56289 150D156X902082 13 4 0180 1746 5 CAPACITOR FXD 15UF 10 20VDC 56289 1500156 902082 13 5 0160 0576 5 75 CAPACITOR FXD 1UF4 20 50VDC CER 28480 0160 0576 1306 0160 2213 1 CAPACITOR FXD 620PF 5 300VDC MICA 28480 0160 2213 A13C7 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 13 8 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C9 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C10 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C11 0160 0576 5 1UF 20 50VDC CER 28480 0160 0576 A13C12 0160 2225 5 1 CAPACITOR FXD 2000PF 5 300VDC MICA 28480 0160 2225 13 13 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0180 0576 13 14 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 13 15 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C16 0160 0576 5 CAPACTOR FXD 1UF 20 CER 28480 0160 0576 13 17 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C18 0160 0576 5 CAPACITOR FXD 1UF 20 50 0 CER 28480 0160 0576 A13C19 0160 6405 10 CAPACITOR FXD 01 1 100VDC MICA 08113 HP204751PF3C1 A13C21 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C22 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 13623 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C24 0140 019
308. 85 If the preceeding conditions are met and the display still docs not respond check the control latches to see the microprocessor is configuring the instrument correctly Use Table 8 1 and the How Measurements are Made part of the Theory of Operation Additionally if needed troubleshoot thc display 8 35 8 36 Model 4935A 8 186 DISPLAY TROUBLESHOOTING 8 187 1 Power down the instrument and remove the front panel Reinstall switch board and power up Note that standard ribbon cable extenders not work they reverse the pins d Check for the following pin conditions on both A2U2 and A2U3 a Voltage at power supply pins should be pin 19 5 v 1 pin 28 ground If not repair power supply or power distribution b Both the mode input pin 9 and the write input pin 8 should be toggling use a logic probe to test The data bus should also toggling pins 5 6 7 and 10 through 14 8 188 If these conditions are met and the display is frozen to check change the output level or shows meaningless numbers the display drive chips have probably failed 8 189 CONTROL TROUBLESHOOTING 8 190 Troubleshoot Keyscan Interrupt Circuitry 8 191 1 Look at I O port 0 U6 pins 3 6 and pins 16 19 for a proper setup word If U6 3 4 5 6 lt high and U6 16 17 18 19 low then go to paragraph 8 192 below otherwise a Remove the front panel and try again b try another processor and
309. 899 0589 8 119 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A3R120 0898 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A3R121 0699 0588 0 RESISTOR 18 171K 1 125W TC 0 25 0699 0588 A3R122 0698 8856 5 1 RESISTOR 12 4K 1 125W 0 25 0698 8858 A3R123 0699 0164 8 1 RESISTOR 738 5 1 125W 0 25 NESS A3R124 0757 0290 5 RESISTOR 6 19K 196 125W TC 0 100 A3R125 0757 0290 5 RESISTOR 6 19K 1 125W F TC 0 100 MFACT 8 T0 6191 F A3R126 0698 6423 2 RESISTOR 31 25K 1 125W TC4 2 098 6423 A3R127 0698 6751 2 1 RESISTOR 44 2K 5 125W TC 0 50 4 1 8 72 4422 0 128 0698 4537 5 1 RESISTOR 357K 1 125W 0 100 0698 4537 A3R129 0698 7585 9 1 RESISTOR 316 2 1 125W TC 0 25 0698 7595 A3R132 2100 3883 9 RESISTOR TRMR 5K 10 TOP ADJ 17 TRN 2100 3883 A3R134 0698 6360 6 RESISTOR 10K 1 125W TC 0425 0698 6360 135 0698 6360 6 RESISTOR 10K 1 125W 0 25 0698 6360 A3R136 0698 6380 6 RESISTOR 10K 1 125W 0 25 0698 6360 A3R137 0699 0590 4 2 RESISTOR 15 758 1 125W 0 25 0699 0590 A3R138 0698 3456 5 1 RESISTOR 287K 1 425W TC 0 100 C4 1 8 T0 2873 F A3R139 0699 0596 0 2 RESISTOR 4 12K 1 125W 0 25 2 0699 0596 140 0699 0596 0 RESISTOR 4 12 190 125W 0 25 0699 0596 A3R141 0699 0594 2 RESISTOR 2 21K 1 125W TC 0 25 0699 0596 A3R142 0699 0594 8 RESISTOR 2 21K 1 125W 0 25 0699 0594 A3R143 0696 8337 1
310. 9 1019 Sio M sj 7 MEE ozn 3 zis 58 292 1 9 00 2 E PET ET sss 1 i C Sid 23 45 69 662 8 8 19 no ze E Mar Z sin 0914 3 04H 6 9 8 5 862 eg Zio 22 Gia eee sin z 595 83 9 80 i Ltd pe 9 9 23 SIKO 560 18 0 2 7714 6 0 ao c3 23 62 ls mae 29 gla 13 z3 29 so 2 s of j h UI aas 4 7 I Roy 93 134 252 19 2 DA 42 e w _ ii nos ap on ig CI L 9 2 9 3 BHD 93 169 29 95 M s 5 9 8 3 8802 94 060 98 2 tj 42 i 8 3 29H 582 sg 2 e il 8 8 9 2 9 882 rg 3 39 4 483 8 5 5 9 80 zg YUU NN 58577 22 2 34 201 Sisaq 201 im HS depu sete I 338 435 234 cree E x H Ot 6 8 9 v s o upuO RECEIVER BD 04935 60004 AND AT3 RECEIVER BD WITH P AR 04935 60006 SERIES 2247 Gu i
311. 9 RESISTOR TRMR 5K 10 TOP ADJ 17 TRN 5100 3883 A3R181 0757 0280 3 RESISTOR 1K 1 125W 0 100 C4 1 8 T0 1001 F A3R182 0757 0421 4 1 RESISTOR 825 1 125W 0 100 C4 1 8 10 925 R F 183 0757 0280 3 RESISTOR 1K 1 125W F TC 0 100 4 1 8 0 1001 184 0757 0465 6 RESISTOR 100K 1 125W F TC 0 100 18 10 1003 A3R185 0757 0401 0 RESISTOR 100 1 125W TC 04 100 eat A3R187 0698 6467 4 RESISTOR 16 9K 1 125W F 0 50 6467 A3R201 0757 0458 7 2 RESISTOR 51 1K 1 125W TC 0 100 C4 1 8 T0 5112 F A3R202 0757 0401 0 RESISTOR 100 1 125W 0 100 4 1 8 0 101 A3R203 0757 0458 7 RESISTOR 51 1 1 125W 0 100 12 F A3R204 0757 0401 0 RESISTOR 100 1 125W 0 100 B T0 101 F A3R205 0698 4002 1 1 RESISTOR 1 125W TC 0 100 ca 8 T0 5001 F A3R206 1910 0369 4 NETWORK RES 6 lt OHM X5 750 cales i A3R207 0698 6445 8 RESISOR 6 838K 1 125W TC 0 25 0698 6445 A3R208 0811 3587 5 WIRE 1 2 IN RESISTOR 0 OHMS 104 A3T 9100 3489 3 1 TRANSFORMER NPUT 106 3409 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 8947 1251 6947 0 CONNECTR SGL CONT 025 5 52 SQ 1251 6947 hs ene A3TP4 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 5 1954 6946 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 A3TP6 1251 6944 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 125
312. 9 vP P 1004 2 signal is present A3U33 LPF has failed 8 Check for a signal at A3U39 8 0 39vP P 10042 If signal is present A3U29 LPF has failed 9 Cheek a signal at A3U39 5 0 39 10042 signal is present A3U39 LPF has failed 10 If none of the above brings the correct signal then there is a jumper or trace problem or bad resistors R129 146 147 Trace backwards from A3U39 pin 6 to JI 8 46 Model 4935 8 232 Service Detector Select Check for 10v 30mv at A3UI3 pin 15 this level is not present A3US has failed or 15 being loaded down Check TP6 approximate 2 5vDC level If a signal is present the voltage to Frequency converter A3U3 has failed or the supporting resistors and capacitors are defective See the overall transmit monitor test paragraph 8 219 for a description of the proper output signal If signal is not present continue NOTE If a DC level is present to 4 5v but is not the proper value and the level changes with small input signal changes then it only needs adjustment Also check the signal at TP23 full wave rectifier output for a greater than 5 difference in alternate peak heights 3 Check a3U13 approximate 2 5vDC level If DC level is missing A3U4 RISS5 has failed 4 Check detector select MUX address 101 at A3U13 11 14 pin 10 Ov 9 14 H this address is not presen
313. 90 99 1 3 29 ocu 90 5210 5 3 555 Uv cg 5 9 42 99 veio i3 59 80 42 59 Ezio 8 2 Otdl 401H 428 6 9 2212 v d zro 2 6 691 90 9 92 T0 175 1 3 tdi 7 3 SOiH 9 G 02 9 ora 9v 841 3 be 6112 541 6 2 eo 8 110 20 vto oy 5 5 4412 42 9 5 2 8 3 9119 eo 9co 9 8 241 1 3 66d 2 8 3 SHD 2 sto G 2 lt 1 9 elio 1 0 r3 16H 5 9 8 3 112 ig tto L9 2023 968 2 SIH 9 3 213 L8 9074 8 3 568 9 8 9 3 1143 s a IED 2 0 83 5 3 a 622 e 8 L3 6u 5 8 9 3 8012 szo 8 8 1 3 268 6 9 4 t2 2 9 13 16H 5 8 Su 5 3 019 22 925 9a 5 6 rd 9019 520 9 19 9 9 3 5 8 Fg 6012 ivy esu 5 8 Su t d FOLD 9 2 9sn 3 5 3 488 5 8 PH COLD 9 2 zzo 8 9 557 581 5 3 988 2019 5 5 ico 2 H zan z6 3 588 B 2 3 i012 2 0 512 es isn 1 9 5 3 iH itd 90012 e2 2 8 5 osn v id en 2 413 ern oh 5234 inr 3 9625 E E 5 52 99 Len BH 841 T3 18H enr 162 ea 5 9 23 Sen 1 0 1915
314. 935 8 202 Digital To Analog Conversion 8 203 Table 8 3 Reference Signatures continued P254 H UC56 619H 4P69 25CP 5919 9C3U 2350 7 6 000041 P254 4 H679 803A AA85 63H5 42P0 2C12 P254 H U48 pin 1 P254 H 320P P254 P254 H 320 H05A 0000 1 40F0 A294 P254 H P254 A294 P254 H P254 H 65536 Hz Figure 8 18 Stair Step Sinewave 0000 L P254 H 0000 L A294 320 UC56 25CP 5919 7P6P 34FH 85 2C12 P254 H 0000 L 0000 L To check the D to A conversion circuitry set the transmit frequency to 65 536 Hz Figure 8 18 shows the waveform at JU2 If this waveform is not present check U21 pin 2 of the current to voltage converter It should have 0 v 20 mv If not U21 the current to voltage converter is probably defective Otherwise the D to A converter chip U33 is suspect or the phase address generator is not working Service 8 39 Service 8 40 Model 4935A 8 204 FILTER AND SIGNAL SELECT CIRCUITRY 8 205 The transmit filter and signal select circuit filters the output of the D to A circuit The wideband low pass filter is used when generating a sinewave When generating the P AR waveform the filtering is done by the 5 kHz low pass filter The SO and SI lines from the output select multiplexer
315. 935A eference P Part 27 fr Part umber Qty Description umber 0757 0442 0698 8558 0698 8558 0699 0657 0699 0657 0699 0658 99 0658 06 0757 0346 0757 0442 0757 0447 0757 0442 2100 3857 2100 3529 0787 0195 RESISTOR 10K 1 125W F TC 0 Ux C4 1 8 TO 1002 F RESISTOR 67 3 25 5W TC 0 50 0698 8558 RESISTOR 87 3 25 5W F TC 0 50 0698 8558 RESISTOR 300 25 5W F TC 0 50 0699 0657 RESISTOR 300 25 5W F TC 04 50 0699 0657 RESISTOR 450 25 50 0699 0658 RESISTOR 460 25 SW TC 0 50 0699 0658 RE SISTOR 10 1 0 100 4 1 8 1080 10K 195 125W TC 0 100 C4 1 8 TO 1002 F RESISTOR 16 2 1 125W TC 0 100 4 1 8 1622 RESISTOR 10K 1 125WF 0 100 C4 1 8 TO 1002 F RESISTOR VARIABLE 1 OK 20 SPECIAL 21 W 3857 RESISTOR VAR CONTROL CP 50 20 10CW 2100 3858 RESISTOR 1M 1 125W TC 0 100 0698 8827 RESISTOR 21 5K 1 125W F TC 0 100 C4 1 8 TO 2152F RESISTOR TRMR 10 2096 C SIDE ADJ17 TRN 43P100 RESISTOR 19 6 1 125WF TC 0 100 1 8 TO 19R6 F RESISTOR100 1 125W 0 100 4 1 8 0 101 RESISTOR 100 1 125WF TC 0 100 C4 1 8 TO 101 F RESISTOR 100 196 125W TC 0 100 C4 1 8 TO 101 F RESISTOR 100 1 125W F TC 0 100 4 To 101 F RESISTOR 1M 1 125W TC 20 100 0698 88 RESISTOR 21 5K 1 125W TC 0 100 ree TO 2152 F RESISTOR TRMR 10 20 C SIDE ADJ17 TRN RESISTO
316. 99 0597 RESISTOR 2 26 196 125W F TC 0 25 A13R160 0698 6360 RESISTOR 10K 196 125W TC 0 25 A13R161 0698 6360 RESISTOR 10K 1 125W F TC 0 25 A13R162 0698 8798 RESISTOR 21 5K 1 125W TC 0 25 A13R163 0699 0593 RESISTOR 13 665 1 125W 0 25 138164 0699 0593 RESISTOR 13 665 1 125W F 0 25 A13R165 0899 0600 RESISTOR 108 502K 1 125W F TC 0 25 0699 0600 0699 0591 A13R166 0699 0591 RESISTOR 140 158 1 125W F 0 25 A13R167 0757 0443 RESISTOR 11K 1 125W F TC 0 100 C4 1 8 TO 1102 F A13R168 0698 4520 RESISTOR 43K 1 125W TC 0 100 C4 1 8 TO 1433 F 1 38 169 RESISTOR 68 1K 1 125W F 0 100 C4 1 8 TO 6812 F A13R170 RESISTOR 10K 1 125W 0 25 0688 8360 RESISTOR 10K 1 125 F TC 0 25 RESISTOR 71 5K 196 125W F TC 0 100 A13R171 A13R172 C4 1 8 TO 7152 F 138173 RESISTOR 82 5K 1 125W 0 100 C4 1 8 TO 8252 F A13R174 RESISTOR 68 1K 1 125W TC 0 100 C4 1 8 TO 6812 F A13R175 RESISTOR TRMR 10K 1096 C TOP ADJ 17 TRN 2100 3884 A13H178 RESISTOR 1 111K 1 125W TC 04 25 C4 1 8 T9 1111R B A13R179 RESISTOR 10K 1 125W F 0 25 0698 6360 A13R180 RESISTOR TRMR 5K 10 C TOP ADJ 17 TRN 2100 3883 A13R182 RESISTOR 825 1 125W F TC 0 100 C4 1 8 TO 825R F A13R183 RESISTOR 1K 1 125W F TC 0
317. A4JU 14 1251 6947 CONNECTOR SGL CONT PIN 025 BSC SZSQ 1251 6947 1258 0141 JUMPER REMOVABLE FOR 025IN SQ PINS 1258 0141 A4JU 14 1251 6947 CONNECTOR SGL CONT 025IN BSC SZSQ 1251 6947 1258 0141 JUMPER REMOVABLE FOR 025IN SQ PINS 1258 0141 0811 3587 0811 3587 0811 3587 1251 6947 RESISTOR 0 OHMS RESISTOR 0 OHMS RESISTOR 0 OHMS CONNECTOR SGL CONT PIN 025IN BSC SZSQ 104 104 104 1251 6947 1853 0512 TRANSISTOR PNP PD 50W FT 20MHZ 1853 0512 1854 0575 TRANSISTOR NPN S1 PD 625MW 2 MPS A42 1953 0512 TRANSISTOR PNP PD 50W FT 20MHZ 1853 0512 1853 0512 TRANSISTOR PNP PD 50W FT 20MHZ 1853 0512 1853 0012 TRANSISTOR PNP SI TO 39 PD 600MW 2N2904A 1854 0053 1853 0036 TRANSISTOR NPN 2N2218 SI T0 5 PD800MW TRANSISTOR PNP SI PD 310MW FT 250MHZ 2N2218 1853 0036 0757 0465 RESISTOR 100K 1 125W F TC 0 100 C4 1 8 T0 1003 F 0698 6360 RESISTOR 1 125W 0 25 0698 6360 0757 0819 RESISTOR 909 1 5W TC 0 100 0757 0819 0757 0442 RESISTOR 10K 1 125W 0 100 C4 1 B T0 1002 F 0698 8827 RESISTOR 1M 190 125W TC 0 100 0698 8827 0698 8826 RESISTOR 825K 1 125W F TC 0 100 0698 8826 0698 8826 RESISTOR 825K 1 t25W 0 100 0698 8826 0698 8827 RESISTOR 1M 1 125W F 0 100 0698 8827 0698 8827 RESISTOR 1M 1 125W TC 0 100 0698 8827 0698 9826 RESISTOR 825K 1 125 F 0 100
318. ACITOR FXD 1UF 10 50VDC CER CAPACITOR FXD 1UF 1090 50VDC CER CAPAC TOR FXD 4 596 300VDC CAPACITOR 20 50VDC CER CAPACITOR 1UF 20 50VDC CER CAPACITOR FXD 01UF 1 100VCD MICA CAPACITOR FXD 10UF 10 20VDC CAPACITOR FXD tOUF 1095 20VDC TA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD tUF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 10UF 1090 20VDC TA CAPACITOR FXD 10UF 10 20VDC TA CAPACITOR FXD 10UF 10 20VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 39PF 4 595 300 VDC MICA CAPACITOR FXD 0820 10 200VDC POLYE CAPACITOR FXD 082U 10 200VCD POLYE CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD tUF 20 50VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 100 10 20VDC TA CAPACITOR F XD 1UF 20 CER CAPACITOR FXD 10UF 10 20VDC CAPACITOR FXD 10UF 1090 20VDC CAPACITOR FXD 600PF 1 300VDC MICA CAPACITOR FXD 1200PF1 100VDC MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 2090 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1500PF 4 595 300VDC MICA CAPACITOR FXD 1700 140 100VDC CAPACITOR FXD 10UF 10 20VDC TA CAPACITOR FXD 1100PF 1 100VDC MICA CAPACITOR FXD 1700Pf 01 100VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF
319. AMP H SLEW RATE 8 DIP P PKG MULTIPLXR ANLG 16 DIP P PKG Manual Changes Mfr Part Number C4 1 8 TO 7152 F C4 1 8 TO 8252 F C4 1 8 10 6812 F 2100 3884 C4 1 8 T9 1111R B 0698 6360 2100 3883 4 1 8 0 8258 4 1 8 0 1001 4 1 8 0 1003 C4 1 8 TO 101 F 2100 3882 0698 6467 C4 1 8 T0 5112 F 0698 6445 104 9100 3489 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 LF353N LM339N VFC32KP 1826 1071 1826 0742 AD7524JN CD4042BE CD4042BE CD4042BE MC 14504BCP CD4051RE MC34081P LF351N LF353N CD4042BE 1826 1071 2507 5 2507 5 HA3 2507 5 HA3 2507 5 HA3 2507 5 LM310N LM310N MC34081P HA3 2507 5 LF347BN LM310N LF353N 1 504 5043 LF347BN DG508CJ HA3 2507 5 DG508CJ See introduction to this section for ordering information Indicates factory selected value 7 65 Manual Changes Model 4935A Table 6 3 Replaceable Parts Continued Reference HP Part C Mfr Part Designator Number D Description Number 13 140 1826 0753 3 2 IC OP AMP LOW BIAS HIGH IMPED SC77968L 1 A131142 1828 0738 2 1 IC AMP WB 6 DIP P PKG HA3 2627 5 A13U43 1826 0667 B iC OP AMP LOW BIAS H IMPD 8 DIP P PKG LF351N A13U
320. ANSFORMER POWER 100 120 220 240V 9100 3489 1311 A13TP2 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 A13TP3 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 A13TP4 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 A13TP5 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 8047 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ A13TP6 A13TP7 1251 8947 1251 6947 1251 6947 1 9 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6847 1 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 A13TP11 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6847 A13TP12 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 A13TP13 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 1 14 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 A13TP15 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 A13TP21 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 CONNECTR SGL CONT 025 5 52 SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ A13TP22 A13TP23 A13TP24 A13TP25 1251 6947 1251 6947 1251 6847 1251 6947 1251 6947 1251 6947 1
321. APACITOR FXD 4 2094 CER CAPACITOR FXD 0 20 50VDC CER CAPACITOR FXD 51 196 300VDC MICA CAPACITOR FXD 196 200VDC MICA CAPACITOR FXD 2400PF 1 300VDC MICA CAPACITOR FXD 1200 1 1000VDC MICA CAPACITOR FXD IUF UF20 50VDC CER CAPACITOR FXD 2400PF 1 300VDC MICA CAPACITOR FXD 1700PF 1 100VDC MICA CAPACITOR FXD 1700PF 196 1 WVDC CAPACITOR FXD IUF 20 CER CAPACITOR FXD OIUF 1 1 WVDC MICA CAPACITOR OIUF 1 20 VDC CER CAPACITOR FXD Q4 UF 1 20 VDC CER CAPACITOR FXD OIUF 1 100VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1 UF 20 50VDC CER CAPACITOR FXD 400PF 1 300VDC MICA CAPACITOR FXD 4700PF 1 300VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 10UF 1096 20VDC TA CAPACITOR FXD O1UF 1 1 WVDC MICA CAPACITOR FXD Q1UF 1 100VDC MICA CAPACITOR FXD 2096 50 0 CER CAPACITOR FXD 1200 1 1 100VDC MICA CAPACITOR FXD 24WPF 1 300VDC MICA CAPACITOR FXD IUF 2096 50VDC CER CAPACITOR FXD 20 50VDC CER CAPACITOR FXD 1200PF 1 100VDC MICA CAPACITOR FXD 24WPF 1 300VDC MICA CAPACITOR FXD 1UF 20 SOVDC CER CAPACITOR FXD 1UF 2096 SOVDC CER CAPACITOR FXD 17WPF 4 196 MICA CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 360 1 300VDC MICA CAPACITOR FXD 4 UF 20 CER CAPACITOR FXD IUF 20 50VDC C
322. APACITOR FXD 1UF 2096 50VDC CER 0160 6623 Aan Fanaa Naan A13C23 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C24 0140 0190 CAPACITOR FXD 39PF 5 300VDC MICA DM15E390J030WV1CR A13C25 0160 6623 CAPACITOR FXD 1UF 20 0160 6623 13 26 0160 6623 CAPACITOR FXD 1UF 20 0160 6623 A13C27 0160 6539 CAPACITOR FXD O1UF 1 100VDC MICA 0160 6538 A13C28 0180 0374 CAPACITOR FXD 10UF 1096 20VDC TA 1500106X9020B2 A13C29 0180 0374 CAPACITOR FXD 10UF 1096 20VDC TA 1500106 9020 2 13 31 0160 6623 CAPACITOR FXD 1UF 20 SOVDC CER 0160 6623 A13C32 A13C33 0180 6623 CAPACITOR FXD 10 20 CER CAPACITOR FXD 1UF 2096 CER 0160 6623 0160 6623 0180 6623 A13C34 0180 0374 CAPACITOR FXD 10UF 10 20VDC 150D106X9020B2 A13C35 0180 0374 CAPACITOR FXD 10UF 1096 20VDC 1500106 902082 13 36 0180 0374 CAPACITOR FXD 10UF 1096 20VDC 150D106X8020B2 A13C37 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C38 0140 0190 CAPACITOR FXD 5 300VDC MICA DM15E390J030WV1CR A13C41 0160 6623 CAPACITOR FXD 1UF 20 CER 0160 6623 A13C42 0160 6623 CAPACITOR FXD 1UF 20 SOVDC CER 0160 6623 A13C43 0160 6623 CAPACITOR FXD 1UF 20 50VDC CER 0160 6623
323. APACITOR FXD 1UF 4 209 6 CER 28480 0160 0576 13 154 0150 0576 CAPACITOR FXD 20 CER 28480 016 0576 13 155 0160 2215 CAPACITOR FXD 750PF 5 300VDC MICA 28480 0160 2215 13 156 0160 0939 CAPACITOR FXD 430PF 1 300VDC MICA 02367 CD15F431J03 A13C157 0180 0197 CAPACITOR FXD 2 3UF 10 20VDC 56289 150D225X9020A2 13 158 0180 0197 CAPCITOR FXD 2 2UF 10 20VDC 56289 150D225X9020A2 A13C159 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 13 160 CAPACITOR HAND SELECTED ONLY IF NEEDED 28480 A13C201 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 13 202 CAPACITOR HAND SELECTED ONLY IF NEEDED A13C203 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C204 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C205 0160 3824 CAPACITOR FXD 3900PF 4 195 05176 HEW 249 A13CR1 1901 1068 DIODE SM SIG SCHOTTKY 28480 1901 1068 A13CR3 1901 0040 DIODE SWITCHING 30V 50MA 2NS DO 35 28480 1901 0040 A13CR4 1901 0040 DIODE SWITCHING 30V 50MA 2NS DO 35 28480 1901 0040 A13CR5 1901 0050 DIODE SWITCHING 200MA 2NS 00 35 28480 1901 0050 A13CR6 1901 0376 DIODE GEN PRP 35V 35 29480 1901 0376 A13CR7 1901 0376 DIODE GEN PRP 35V 50MA DO 35 28480 1901 0376 A13CR8 1901 0518 DIODE SCHOTTKY 02062 5082 5509 A13CR9 1901 0518 DIODE SCHOTTKY 02062 5082 5509 1 1901 0518 DIODE SCHOTTKY 02062 5082 5509 A13CR12 1901 0518 DIODE SCHOTTKY 02062 5082 5509 A13CR
324. APACITOR FXD 1200PF 1 100VDC MICA 0160 3291 4 44 0160 3291 CAPACITOR FXD 1200PF 1 100VDC MICA 0160 3291 4 45 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C46 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C47 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 4 48 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 4 49 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A4C50 0160 0576 CAPACITOR FXD 1UF 20 SOVDC CER 0160 0576 A4C51 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 4 52 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 4 53 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 4 54 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4CSF 0160 0127 CAPACITOR FXD 1UF 20 25VDC CER 0160 0127 A4C56 0180 3124 CAPACITOR 75 300 0180 3124 4 62 0180 0197 CAPACITOR FXD 2 2UF 10 20VDC 1500225 9020 2 4 63 0180 0197 2 2UF 10 150D225X9020A2 A4C64 1060 0576 CAPACITOR FXD 1UF 020 50VDC CER 0160 0576 A4C65 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C67 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 4 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 4 69 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C70 0160 0127 CAPACITOR FXD 1UF 20 25VDC CER 0160 0127 4 7 I 0180 0374 CAPACITOR FXD 104 10 20VDC 150D106X9020B2 A
325. ATE 8 DIP P PKG HA3 2507 5 A13U26 1826 0208 3 IC OP AMP GP 8 DIP P PKG LM310N 13028 1826 0208 3 IC OP AMP GP 8 DIP P PKG LM310N A13U29 1826 1544 3 IC OP AMP GP 8 DIP P PKG 1826 1544 A13U30 1826 0735 1 IC OP AMP H SLEW RATE 8 DIP P PKG HA3 2507 5 A13U31 1826 0665 IC OP AMP LOW BIAS H IMPD QUAD 14 DiP LF347BN A13U32 1826 0712 IC OP AMP LOW BIAS H IMPD DUAL 8 DIP LM310N A13U33 1826 0208 OP AMP GP 8 DIP P PKG LF353N A13U34 1826 0740 IC SWITCH ANLG OUAL 16 DIP C PKG IH5043CDE A13U35 1826 0740 IC SWITCH ANLG DUAL 16 DIP C PKG IH5043CDE A13U36 1826 0665 iC OP AMP LOW BIAS H IMP QUAD 14 DIP P LF347BN A13U37 1820 1725 IC MULTIPLXR ANLG 16 DIP P PKG DG508CJ A13U38 1820 0735 IC OP AMP H SLEW RATE 8 DIP P PKG HA3 2507 5 A13U39 1820 1725 IC MULTIPLXR ANLG 16 DIP P PKG DG508CJ A13U40 1826 0753 IC OP AMP LOW BIAS HIGH IMPED SC77968L1 13042 1826 0736 IC WB 8 DIP P PKG 2627 5 A13U43 1826 0667 IC OP AMP LOW BIAS H IMPD 8 DIP P PKG LF351N 13044 1826 0667 IC OP AMP LOW BIAS H IMPD 8 DIP P PKG LF351N A13U45 1826 0667 IC OP AMP LOW BIAS H IMPD 8 DIP P PKG LF351N A13U46 1826 0712 IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P LF353N See introduction to this section for ordering information Indicates factory selected value 6 31 Replaceable Parts Model 4935A Ref ren
326. ATION NC NC FOR COMPLETE DESCRIPTION ON OFF PWR 3 2 UNLESS OTHERWISE INDICATED yee 4 RESISTANCE IN OHMS 3 AE CAPACITANCE IN FARADS INDUCTANCE HENRIES EP NOTE KI DRAWN AS UNENERG IZED AC OPERATION P O JI 5V UNREG 14 UNREG i 14V UNREG 16 A4 TRANSMITTER pwr A2 SWITCH RELAY DRIVE CIRCUIT 7 4V BATT E POWER m SWITCHES l STBY 1 t a E iO0K 2 ZD YQ TJ V R5 R3 CR6 1000 51 1K N 1 0 hee ON OFF 1 _ Figure 7 32 5 Charger Board Schematic Diagram 7 43 7 44 blank Model 4935A Manual Changes Table 6 3 Replaceable Parts Reference HP Part Mfr Mfr Part Number 2 ct lt Description Designation Number Code Al 04935 80009 FRONT PANEL W PAR 002 003 ONLY 28480 04935 80009 Al 80010 80010 FRONT PANEL W NTG STD UNIT ONLY 28480 80010 80010 A1DS1 0540 1990 0810 LED SERVICE ONLY 28480 5082 4160 A2 04935 60102 I SWITCH BOARD ALL UNTTS 28480 04935 60102 2 2 0160 0574 5 CAPACITOR FXD 1UF 207 50UDC 28480 0160 0576 A2C3 0160 0576 5 CAPACITOR FXD 1UF 20 50UDC CER 28480 0160 0576 ACA 0160 0302 5 CAPACITOR FXD 018UF 10 200UDC POLYE 28480 0160 0302 ARCS 0160 0576 5 CAPACITOR FXD 1UF 20 50UDC CER 284860 0160 0576 A2C
327. Board Schematic Diagram 1 of 2 Replace with partial schematic shown in Figure 7 15 CHANGE 8 Page 6 14 Table 6 3 Replaceable Parts Continued Change 8 to 0699 0567 RESISTOR 137K 1 125W CD 5 Mfr Code 28480 Mfr P N 0699 0567 Page 6 17 Table 6 3 Replaceable Parts Continued Change A4 to 04935 60203 TRANSMITTER BOARD std unit only Mfr Code 28480 Mfr P N 04935 60203 Page 6 19 Table 6 3 Replaceable Parts Continued Delete A4R97 0757 0442 RESISTOR 10K 1 125W CD 9 Mfr Code 24546 Mfr P N C4 1 4 TO 1002 F Delete A4R98 0757 0278 RESISTOR 1 78K 1 125W CD 9 Mfr Code 02273 Mfr P N CEA 993 Delete A4R99 9698 3157 RESISTOR 19 6K 1 125W CD 0 Mfr P N CEA 993 Delete 4 100 0757 0428 RESISTOR 1 62K 1 125W CD 7 Mfr Code 02995 Mfr P N MF4C 1 Change A4R80 to 0757 0420 RESISTOR 750K 1 125W CD 3 Mfr Code 24546 Mfr P N C4 1 8 TO 751 F Change A4R81 to 0757 0290 RESISTOR 6 19K 1 125W CD 5 Mfr Code 19701 Mfr P N 4 1 8 6191 Page 6 20 Table 6 3 Replaceable Parts Continued Delete A4U53 1826 0735 AMP H SLEW RATE 8 DIP PKG CD 1 Mfr Code 34371 Mfr P N 2507 5 Page 6 22 Table 6 3 Replaceable Parts Continued Change 1205 0512 to 1205 0309 HEAT SINK SGL TO 220 CS CD 9 Mfr Code 28480 Mfr P N 1205 0309 Page 6 31 Table 6 3 Replaceable Parts Continued Change 14 to 04935 60207 TRANSMITTER BOARD WITH PAR CD 7 Mfr Code 2848
328. CAPACITOR FIXED 15UF 4 596 CAPACITOR FIXED 15UF 4 596 50VDC CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 2200UF 50 1096 25VDC AL CAPACITOR FXD 100UF 50 1096 35VOC AL CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 2200UF 50 1096 25VDC AL CAPACITOR FXD 100UF 4 50 1096 35VDC AL CAPACITOR FXD 1000PF 1096 1KVDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 3300UF 4 50 1096 16VDC AL CAPACITOR FXD 1UF 2096 CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1000PF 1096 1KVDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 SOVDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 10PF 5 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 20 50VDC CER CAPACITOR FXD 330UF 50 1096 16 AL CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 2096 CER CAPACITOR FXD 50UF 75 10 25VDC AL CAPACITOR FXD 1UF 10 25VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1200PF 196 100VDC MICA CAPACITOR FXD 1200 1 100VDC MICA CAPACITOR FX
329. CAPACITOR FXD 2200UF 50 1096 25VDC AL CAPACITOR FXD OOUF 50 10 35VDC AL CAPACITOR FXD IUF 20 50VCD CER CAPACITOR FXD IUF 20 WVCD CER UF 20 50VCD CER CAPACITOR FXD 20 SOVCD CER CAPACITOR FXD 200UF 50 10 25VDC AL CAPACITOR FXD OOUF 50 10 35VDC AL CAPACITOR FXD 1000PF t lO 1KVDC CER CAPACITOR FXD 1UF 2096 50VCD CER CAPACITOR FXD 3300UF 50 10 18VDC AL CAPACITOR FXD IUF 20 WVDC Cen CAPACITOR FXD IUF 20 50VDC C CAPACITOR FXD 1000UF 10UF rKVOG CER CAPACITOR FXD UF 20 CER CAPACITOR FXD 1 UF 20 SOVDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 10PF 5 50VDC CER CAPACITOR FXD 33PF 5 SOVDC CER CAPACITOR FXD 20 50 0 CER CAPACITOR FXD 1 UF 0 50VDC CER CAPACITOR FXD 1 UF 20 CER IUF 20 50VDC CER CAPACITOR FXD 50 1096 16 AL CAPACITOR FXD UF 20 50VDG CER CAPACITOR FXD 1 UF 20 5OVDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD IUF 20 5 CER CAPACITOR FXD 50UF 75 10 25VDC AL CAPACITOR FXD 1UF 10 25VDC CER CAPACITOR FXD 1 UF 20 SOVDC CAPACITOR FXD 1UF 20 5 CER CAPACITOR FXD 1200PF 1 100VDC MICA CAPACITOR FXD 1200PF 1 100VDG MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 5OVDC CER CAPACITOR FXD UF 20 50VDC CER CAPACITOR FXD tUF 20 50VDC CER CAPACITOR
330. CE IN MICROFARADS Jl 27 30 INDUCTANCE IN HENRIES I 3 ASTERISK INDICATES FACTORY SELECTED COMPONENT AVERAGE YALUE SHOWN 4 UNLESS OTHERWISE INDICATED ALL GROUNDS ARE DIGITAL GROUNDS P O GROUND PLANE ANALOG GND 35 39 40 7 ai Xe SWITCH BOARD 7 1 J3 5 M 1 19 20 SWITCH P O my J TO A3 RECEIVER 14 J y 47 50 TO A2 SWITCH BOARD oM P70 ON OF F J3 J 36 5 14 99 uu Z n ss Se 79 aes NC 4 4 26 7 30 v A4 Transmitter Board Schematic _ _ REVISED 1 86 sucer 2 ll Diagram Sheet 2 of 2 7 41 E cr 1018207 peog 6 4 4 1 QD O D D O D 2 v v EU 8 3 q Q q o 201 2630 3889 OlH9 241 19 41 If 01 93930705 SEPTEM ES INS bl f a LINIA X374 0l2 V e e 22 2 L 19 j 0009 5260 1 042 8 9 t PPON weeg peog 1 25 2 an id 28 01
331. CITOR FXD 1UF 20 50900 CER 28480 0160 0576 A2CRB 1906 0069 4 DIODE FU BRDG 400 14 28409 1906 0069 ALCRO 1906 0069 4 DIODE FU 4009 14 29489 1906 0069 A2CR51 1826 0585 9 V REF 92 27014 LM129DZ A2CR71 1826 0585 9 REF 0 92 27014 1 M329DZ A2DS1 1990 0681 3 DISPLAY AN SEG 1 4080 H RED 28480 50882 7656 APDS2 1990 0540 3 DISPLAY NUM SEG 1 CHAR 43 H 2153480 2082 7650 A2DS3 1990 0540 3 DISPLAY NUM SEG 1 CHAR 43 H 28480 082 7650 A2DS4 1990 0540 3 DISPLAY NUM SEG 1 CHAR 43 H 20480 5082 7620 A2DSS 1990 0540 3 DISPLAY NUM SEG 1 CHAR 43 H 28480 5082 7650 gt 056 1990 0540 DISPLAY NUM SEG 1 43 28480 5082 7650 205 1990 0540 DISPLAY NUM SEG 1 43 H 28480 5082 7650 8 2058 1990 0540 DISPLAY NUM SEG 1 CHAR 43 H 28480 5082 7650 A2DS9 1990 0540 DISPLAY NUM SEG 1 CHAR 43 H 28480 5002 7650 a2J2 1251 6947 CONNECTOR SCGL CONT PIN 025 IN BSC 52 50 28480 1251 6947 275 1251 3677 CONNECTOR TEL JACK 2 CKT 25 SHK DTA 28480 1251 3677 2174 1251 3677 CONNECTOR TEL JACK 2 CKT 2 5 5HK DIA 284H0 12551 3677 216 CONNECTOR 13 PIN POST TYPE 20480 1251 5537 2177 125176537 CONNECTOR 13 PIN POST TYPE 28480 1251 6537 78 1250 9257 CONNECTOR RF SME M 20480 1250 0257 204 1854 0644 TRANSISTOR NPN 245585 GL 10 66 PDz35W 01928 ONBSBS 298 1854 0644 TRANSISTOR NPN 2N3585 51 TO 66 PD 35uW 01926 QN3585 A2Q51 1854 0575 TRANSISTOR NPN SI PD 625MW FTz5S0MHZ 04713 5 42
332. CITOR FXD 1UF 20 50VDC CER 0160 0576 4 17 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A4C20 0160 3456 CAPACITOR FXD 1000UF 10UF 1KVDC CER 0160 3456 4 21 0160 0576 CAPACITOR FXD 20 50VDC CER 0160 0576 A4C22 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A4C23 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A4C24 0160 2257 CAPACITOR FXD 10PF 5 50VDC CER 0160 2257 A4C26 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 4 28 0160 0576 CAPACITOR FXD 1UF 0 CER 0180 0576 A4C29 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 4 30 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C31 0180 3050 CAPACITOR FXD 330UF 450 1096 16VDC AL 0180 3050 A4C32 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C33 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 4 34 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C35 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C36 0180 0058 CAPACITOR FXD 50UF4 75 1095 25VDC AL 30D506G025CC2 A4C37 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 4 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 4 39 0160 0576 CAPACITOR FXD 1UF 20 0160 0576 4 40 0160 3094 CAPACITOR FXD 1UF 10 25VDC CER 0160 3094 4 4 1 0160 0576 CAPACITOR FXD 1UF 20 CER 0160 0576 A4C42 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 A4C43 0160 3291 C
333. CITOR FXD 1UF 2090 50VDC CER SQUF 75 10 25VDC AL CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 10 25VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1200PF 1 100VDC MICA CAPACITOR FXD 1200PF 1 100VDC MICA CAPACITOR FXD 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD tUF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 2090 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD tUF 20 25VDC CER CAPACITOR 75 300 CAPACITOR FXD 4700PF 1 300VDC MICA CAPACITOR FXD 4700PF 190 300VDC MICA CAPACITOR FXD 4700PF 4 199 300VDC MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 2 2UF 10 20VDC CAPACITOR FXD 2 20 10 20VDC TA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 10 20 50VDC CER CAPACITOR FXD 1UF 4 2096 50VDC CER CAPACITOR FXD 1UF 20 25VDCCER CAPACITOR FXD tOUF 10 20VDC CAPACITOR FXD t5UF 10 20VDC CAPACITOR FXD 022UF 10 100VDC CER Indicates factory sclected value Mfr Code 28480 28480 28480 28480 28460 28480
334. CITOR FXD 1700PF 1 100VDC MICA CAPACITOR FXD 1700PF 4 196 100VDC MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD O1UF 1 100VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 2096 CER CAPACITOR FXD 01UF 1 100VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 400PF 4 196 300VDC MICA CAPACITOR FXD 4700PF 1 300VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 10UF 10 20VDC CAPACITOR FXD 01UF 4 196 100VDC MICA CAPACITOR FXD 01UF 4 196 100VDC MICA CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 1200PF 1 100VDC MICA CAPACITOR FXD 2400PF 4 196 300VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1200PF 1 100VDC MICA CAPACITOR FXD 2400PF 196 300VDC MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1700PF 1 300VDC MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 2096 50VDC CER CAPACITOR FXD 330PF 196 300VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 01UF 1 100VDC MICA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD O1UF 4 196 100VDC MICA CAPACITOR FXD 1700PF 4 196 100VDC MICA CAPACITOR FXD 1100PF 4 196 500VDC MICA CAPACITOR FXD 1200PF 1 100VDC MICA CAPACITOR FXD 2400PF 4 196 300VDC MICA CAPACITOR FXD 1700PF 4 19
335. D 12 0 TO 0 2A 0 50 0 TO 0 2A INPUT VOLTAGE RANGE 50mV 300V BANDWIDTH 500 2 FILTER 30kHz RANGE AC COUPLED 30Hz TO 100MHz SENSITIVITY 1 0mV TO 1 OOMHz A ADJUSTMENTS T TROUBLESHOOTING 1 3 List of Parts Used for Performance Tests DESCRIPTION 1350hm 1 RESISTOR 6000hm 1 RESISTOR 90 1 RESISTOR TERMINATION 6000hm BNC TO BNC BNC TEE FEMALE BNC TO TYPE 310 POMONA NO 2798 OR EQUIVALENT BNC TO DUAL BANANA JACK POMONA NO 1296 DUAL BANANA COMPONENT CARRIER POMONA NO 1 330 ST DIAGNOSTIC SERVICE KIT General Information Model 4935A 1 23 BATTERY OPERATION Options 001 and 003 24 Nickel Cadmium batteries enable 4935A to be used in areas removed from power Typical operating time 152 5 hrs when fully charged The batteries are trickle charged whenever instrument is connected to an AC source and the POWER switch is in STBY 1 25 Regular discharge charge cycles are recommended to maintain battery capacity The instrument should be operated until batteries are discharged instrument stops working then recharged at least every 30 days Normal recharge time is about 17 hours Typical battery life under normal operating conditions should he at least 100 charge discharge cycles ins u C 0o A 1 26 Charging the Batteries 1 27 The internal battery pack consists of three rechargeable battery packs 6V 15 6V and 15 6
336. D 1UF 2096 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 25VDC CER CAPACITOR 75 300 N P CAPACITOR FXD 4700PF 4 196 300VDC MICA CAPACITOR FXD 4700PF 1 300VDC MICA CAPACITOR FXD 4700PF 4 196 300VDC MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 2 2UF 10 20VDC TA CAPACITOR FXD 2 2UF 10 20VDC TA CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 25VDC CER CAPACITOR FXD 10UF 10 20VDC TA CAPACITOR FXD 15UF 1096 20VDC TA CAPACITOR FXD 022UF 1096 100VDC CER CAPACITOR FXD 1UF 10 50VDC CER CAPACITOR FXD 1UF 1096 35VDC CER CAPACITOR FXD 01UF 10 5OVDC CER CAPACITOR FXO 01UF 10 50VDC CER CAPACITOR FXD 01UF 10 CER CAPACITOR FXD 01UF 10 50VDC CER CAPACITOR FXD 010 10 50VDC CER CAPACITOR FXD 01UF 10 50VDC CER CAPACITOR FXD 01UF 10 CER Sce introduction to this section for ordering information ndicates factory selected value Replaceable Parts 04935 60035 0160 3815 0160 3815 0160 3815 0160 6623 0180 3045 0180 4017 0160 6623 0160 6623 0160 6623 0160 6623 0180 3045 0180 2945 0160 3456 0160 6623 0180 3044 0160 6623 0160 6623 0160 3456 0160 6623 0160 6623 0160 6623 0160 4791 0160 4807 0160
337. D 4UF 20 50VDC CER CAPACITOR FXD 1UF 10 35VDC TA CAPACITOR FXD 200UF 75 10 16VDC AL CAPACITOR FXD QUF 10 6VCD CAPACITOR FXD 60UF 10 6VDC CAPACITOR FXD 20 CER CAPACITOR FXD UF 20 CAPACITOR FXD gt 20 5OVDC CER CAPACITOR FXD 1000PF 95 29 CER 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 5OVDC CER CAPACITOR FXD 10 35VDC CAPACITOR FXD 01 UF 20 OOVDC CER CAPACITOR FXD 01UF 20 100VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD IUF 2096 5OVDC CER CAPACITOR FXD IUF 20 50VDC CER CAPACITOR FXD 68UF 10 35VOC TA CAPACITOR FXD Q1UF 20 1 CER CAPACITOR FXD 20 100VDC CER CAPACITOR FXD 1UF 20 5OVDC CER CAPACITOR FXD UF 20 SOVDC CER DIODE FW BRDG 4WV IA DIODE FW BRDG 400V IA V REF TO 92 V REF TO 92 DISPLAY AN SEG I CHAR 408 H RED OISPLAY NUM SEG I CHAR 43 H DISPLAY NUM SEG I CHAR 43 H DISPLAY NUM SEG I CHAR 43 H DISPLAY NUM SEG I CHAR 43 DISPLAY NUM SEG I CHAR 43 H DISPLAY NUM SEG I CHAR 43 H DISPLAY NUM SEG I CHAR 43 DISPLAY NUM SEG 43 H DISPLAY LT BAR MDL CONNECTOR SGL CONT PIN 025 IN BSC CONNECTOR TEL JACK 2 2 CKT 25 SHK DIA CONNECTOR TEL JACK 2 25 SHK DIA CONNECTOR SGL CONT PIN 025 IN BSC CONNECTOR 13 PIN POST NPE CONNECTOR 13 POST TYPE CONNECTOR RF SMBM PC 50 TRANS
338. D JUMPER WIRE 90 39 is 36 35 34 33 32 31 29 28 2 26 25 24 23 22 2 C 50 IL A ee 2 124 3 122 4i i 6 7 z 8 9 19 MI 12 i csa2 8 ais 2 ja 3 5 u 4 5 5 3 7 7 21 2 2 41 1 5 4 6 E 3 1 I u 1 E 7 Si HIE ES CPI 2 b Loop 4 U 7 SHIFLD 4 6 anu 8 9 4 i ul 4 1048 3 5 4 a 3 use a T3 Fr 2 by J a M WE g 3 Kal 2 5 lt o 7 Pepper 12 c c L 7 2 2 i C 5 8 6 i 5 n i as x P 582 ejs 1 Nice p au 14 7 a y 3 1 C5 Do ERO de c pe ee 6 DIR 5 ae R E 9 nus R r clefs i 4 IR 114 716 7 6 L 1211 1 cui 5 4 5 UP b re cfe 1 6 ci En C C 2 13 E fel U 3j R R x 12 t 2 3 4 4 4 5 y 10 _ 5 10 E T 8 z L T 2 2 isj 13 5 21 PERS J C ui R
339. E DRAWN AS THEY WOULD BE WITH A LOGIC 1 ON THE CONTROL OUTPUT R34 QRMS DETECTOR c34 0 10K R9 2 10 21 884 9 10K R74 M 19 6K x We c36 R40 3 10K 4 C41 v R66 R56 16 10K 5110 em R68 44 v V 6 4 C201 10 12 1K 0 1 OFFSET c23 L R47 R201 9760 14 14V 5 R70 R69 CRIS 750 21 5K EN R29 5000 C59 R67 10 19 8K a 1 R57 0 v 4640 AVE R205 R27 R23 5K 3 83K 2000 DET m V 14V TP23 2t 2 TP24 C35 R28 2 10 10K R46 R39 4640 2370 C47 ROB 10 CR6 3480 L FULL WAVE RECTIFIER gt AUTORANGE BLOCK d 150 KHZ LPF C61 15 1700PF C60 2 1100PF 18 0 21 13 414v T14V C73 0 1 U39 14V R91 R72A 1000 1000 71 2 1 M Fa ooo P a aaan gt 2000 2 ay H5 14v 14 14V QRMS 2 DET m ion 14V 7 0 R32 R185 211 ___15 2 0 1 100 3 3 7 R12 30 1K 1 7 Ur mus VOLT TO FREQ 7 Sis CONVERTER 2200PF R30 511 S 4 SE 4 C6 V 620PF CR7 n M n I M F F C V x lt
340. E GEN PRP 180 200MA 00 7 1901 0033 A4CR20 1901 0033 DIODE GEN PRP 180V 200 00 7 1901 0033 AACR23 1902 1399 DIODE ZNR 18 0V 2 PD 4W INS248 A4CR24 1884 0250 THYRISTOR TRIAC T0 220AB 125008 A4CR25 1902 0052 DIODE ZNR 6 81 2 PD 4W SZ 30016 1135 A4CR26 1901 0731 DIODE PWR RECT 400V 1A 1901 0731 A4CR27 1901 0033 DIODE GEN PRP 180V 200MA DO 7 1901 0033 A4CR28 1901 0033 DIODE GEN PRP 180V 200MA DO 7 1901 0033 A4CR29 1901 0202 DIODE ZNR 15V 5 00 15 PD 1W TC 057 1901 0202 A4CR30 1902 0202 DIODE ZNR 15V 5 00 15 PD 1W 57 1902 0202 A4CSA1 AACSA 2 1251 6947 1251 6947 CONNECTOR SGL CONT 025IN BSC SZSQ CONNECTOR SGL CONT PIN 025 5 5250 1251 6947 1251 6947 A4J2 A4J3 1251 6856 1251 4573 CONNECTOR 18 PIN M POST TYUPE CONNECTOR PC EDIGE 25 CONT ROW 2 ROWS 1251 6856 1251 4573 A4JU1 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6947 A4 JU 1251 6947 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6947 1258 0141 JUMPER REMOVABLE FOR 025 SQ PINS 1258 0141 A4JU5 1251 6947 CONNECTOR SGL CONT PIN 025IN 5 5250 1251 6947 1258 0141 JUMPER REMOVABLE FOR 025IN SQ PINS 1258 0141 A4JUG 1251 6947 CONNECTOR SGL CONT PIN 025IN 5 5250 1251 6947 1258 0141 JUMPER REMOVABLE FOR 025IN SQ PINS 1258 0141
341. ECTOR PC EDGE 25 CONT ROW 2 ROWS 1251 4573 A14JU1 1251 6947 0 CONNECTOR SGL CONT P 025IN BSC SZSQ 1251 6947 AT4JU2 1251 6947 0 CONNECTOR SGL CONT P 025IN BSC SZSQ 1251 6947 1258 0141 5 JUMPER REMOVABLE FOR 025IN SQ PINS 1258 0141 A14JU5 1251 6947 0 CONNECTOR SGL CONT P 025IN 2 1251 6947 1258 0141 5 JUMPER REMOVABLE FOR 025 IN SQ PINS 1251 0141 A14JU6 1251 6947 0 CONNECTOR SGL CONT P 025IN BSC SZ2SQ 1251 6947 1258 0141 5 JUMPER REMOVABLE FOR 025 IN SQ PING 1251 0141 A14JU14 1251 6947 0 CONNECTOR SGL CONT P 025IN BSC SZ7SQ 1251 6947 1258 0141 5 JUMPER REMOVABLE FOR 025 IN SQ PINS 1251 0141 A14JU t4 1251 6947 0 CONNECTOR SGL CONT P 025IN BSC S2 SQ 1251 6947 258 0141 5 JUMPER REMOVABLE FOR 025 IN SQ PINS 1251 0141 Al4Jwe 0811 3587 5 RESISTOR 0 OHMS 104 14 0811 3587 5 RESISTOR 0 OHMS 104 14 1 1251 6947 0 CONNECTOR SGL CONT PIN 025IN BSC SZSQ 1251 6947 A14Q1 1853 0512 9 TRANSISTOR PNP PD 50W F1 20MHZ X45H2B1 A14Q2 1854 0575 6 TRANSISTOR NPN PD 625MW FT 50MHZ MPS A42 A14Q3 1853 0512 9 TRANSISTOR PNP PD 50W FT 20MHZ X45H281 A1404 1853 0512 9 TRANSISTOR PNP PD 50W FT 20MHZ X45H281 1405 1853 0012 4 TRANSISTOR PNP SI 39 PD 600MW 2N2904A A14G6 1853 0053 5 TRANSISTOR NPN SI TO 5 PD 800MW 2N2218 A14Q7 1853 0036 2 TRANSISTOR PNP SI PD 310MW FT 250MHZ 1853 0036 1481 0757 0465 6 RESISTOR 100K 1 125W 0 100 C4 1 8 T0 1003 F 14 2 0698 6360 6 RESISTOR 10K 1 125W TC 04 25 0698 6360 A14R3 0757 0819 4 RESISTO
342. ER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 01UF 4 196 IWVDC MICA CAPACITOR FXD 1 UF 020 5 CER CAPACITOR FXD 01 UF 1 1 WVDC MICA CAPACITOR FXD 1700PF 1 1 MICA CAPACITOR FXD 11 WPF 1 1 WVDC MICA CAPACITOR FXD 1200PF 4 199 100VDC MICA CAPACITOR FXD 24WPF 4 196 MICA CAPACITOR FXD 1700PH 1 100VDC MICA CAPACITOR EI UESTRE EEN A FXO 1 20 50VDC CAPACITOR FXD TUF 20 CER CAPACITOR FXD 10UF 1096 20VDC CAPACITOR FXD 1700PH 1 JDE MICA 1UF 20 SOV ER CAPACITOR FXD 20 50VDC CER CAPACITOR FXD O1UF 1 100VDC MICA CAPACITOR FXD 20 CER CAPACITOR FXO 1UF_ 20 CER CAPACITOR FXD 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD O1UF 1 IWVDC MICA CAPACITOR FXO 1 UF 20 SOVDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD UF 20 50VDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 750PF 5 300VDC MICA CAPACITOR FXD 430PF 1 300VDC CAPACITOR FXO 2 20 105 20VDC CAPACITOR FXO 2206 105 20VDC See introduction to this section for ordering information Indicates factory selected value Replaceable Parts Number 0160 6623 0160 6623 0160 6802 0160 6623 01 W 6623 0160 6623 0160 6623 0180 7102 0160 6918 01 5877 0160 7099 0160 6623 01 W 5877 0160 7100 0160 7100 OIW 6623 HP204751PF3C1 0160 66
343. ESISTOR 10K 1 125W TC 0 25 RESISTOR 100K 1 125W TC 0 50 RESISTOR 10K 1 125W TC 0 25 RESISTOR 29 4K 1 125W TC 0 100 RESISTOR 29 4 1 125W TC 0 100 RESISTOR 25 5K 1 125W TC 0 25 RESISTOR 25 5K 196 125W F TC RESISTOR 1K 1 125W 0 ve 100 RESISTOR 1 111K 1 125W 0 25 838K 1 1 125W 0 25 RESISTOR 365K 1 125W TC 0 25 RESISTOR 240 730K 1 125W TC 0 26 RESISTOR 16 9K 1 125W F TC 0 50 RESISTOR 12 910K 1 125W TC 0 25 RESISTOR 18 171 4 125W TC 04 25 RESISTOR TRMR 5K lo C TOP ADJ 17 RESISTOR 21 62K 196 125W F 0 1 RESISTOR 31 25 1 125W TC 0 25 RESISTOR 17 4 25 125W TC 0 100 RESISTOR 12 4K 1 125W TC 04 25 RESISTOR 12 4K 1 125W F TC 0 25 RESISTOR 18 171K 196 125W TC 0 50 RESISTOR 9 09 1 125W TC 0 50 RESISTOR 10K 1 125W TC 0 25 RESISTOR 16 9 1 125W 0 50 RESISTOR 15 5K 1 125W 0 25 RESISTOR 25 5K 196 125W F 25 RESISTOR 6 838K 196 125W TC 04 25 RESISTOR 3 16K 196 125W TC 0 25 RESISTOR 13 3K 1 125WF TC 0 100 RESISTOR 34 334K 196 125W TC 0 25 RESISTOR 34 334K 1 125W FTC 0 25 RESISTOR 10K 1 125W F TC 0 25 RESISTOR 10K 1 125WF 0 25 RESISTOR 18 171K 1 125W 25 Replaceable Parts fr Part umber PMF55 1 8 T0 9761 F MC2C1 8 T9 111 0698 6360 0
344. ESISTOR 10K 1 125W TC 0 100 4 1 8 1002 A5R30 0698 0083 8 RESISTOR 1 96K 1 125W 0 100 C4 1 8 TO 1961 F ASR31 0757 0465 6 RESISTOR 100K 1 125W TC 0 100 C4 1 8 TO 1003 F A5R32 0757 0418 g RESISTOR 619 1 125W 0 100 C4 1 8 TO 619R F A5R33 0757 0984 4 RESISTOR 10 1 5W TC 100 0757 0984 A5R34 0811 1673 6 RESISTOR 3 9 5 2W PW TC 0 400 BWH2 3R9 J A5R35 0698 3409 8 RESISTOR 2 37K 1 5W 0 100 0698 3409 A5R36 0698 3404 RESISTOR 383 1 5W TC 0 100 0698 3404 A5R37 0757 0280 RESISTOR 1K 1 125W TC 0 100 C4 1 8 TO 1001 F A5R38 0698 6360 RESISTOR 10K 1 125W 0 25 0698 6360 A5R39 0698 6360 RESISTOR 10K 196 125W TC 04 25 0698 6360 ASR40 0757 0280 RESISTOR 1K 1 125W TC 0 100 C4 1 8 TO 1001F ASTP1 0360 0124 CONNECTOR SGL CONT P 04 IN BSC SZ 0360 0124 2 0360 0124 CONNECTOR SGL CONT 04 5 52 0360 0124 4501 1826 0138 IC COMPARATOR GP QUAD 14 DIP P PKG LM339N 4502 1826 0712 IC LOW BIAS H IMPD DUAL 8 DIP P LF353N 0490 0570 SOCKET RLY 6 CONT CRADLE PC 0490 0570 1205 0309 STRAP RELAY HOLD DOWN FOR PC SOCKETS 1205 0309 1205 0512 HEAT SINK SGL TO 220 CS 1205 0512 1251 6859 CONNECTOR 18 PIN F POST TYPE 1251 6859 8120 3181 CABLE ASSY FLEX COND 8120 3181 See introduction to thts section for ordering information 7 58 Indicates factory selected value Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued Re
345. ESISTOR 34 334 1 125W F 0 25 0699 0589 A13R119 0698 6360 RESISTOR 10K 1 125W TC 0 25 0698 6360 A13R120 0698 6360 RESISTOR 10K 1 125W TC 0 25 A13R121 0699 0588 RESISTOR 18 171K 1 125W 0 25 138122 0698 8858 RESISTOR 12 4K 1 125W F 0 25 RESISTOR 738 5 1 125W 0 25 RESISTOR 6 19K 1 125W TC 0 100 0699 0164 0757 0290 A13R123 A13R124 MF4C1 8 T0 6191 F A13R125 0757 0290 RESISTOR 6 19 1 125W TC 0 100 MF4C1 8 TO 6191 F A13R126 0698 6423 RESISTOR 31 25K 1 125W TC 2 098 6423 138127 0698 6754 RESISTOR 44 2 5 125W F TC 0 50 4 1 8 72 4422 0 138128 0698 4537 RESISTOR 357K 1 125W 0 100 0698 4537 A13R129 0698 7585 RESISTOR 316 2 1 125W TC 0 25 0698 7585 A13R132 2100 3883 RESISTOR TRMR 5K 10 C TOP ADJ 17 TRN 2100 3883 A13R134 0698 6360 RESISTOR 10K 1 125W TC 0 25 0698 6360 138135 0698 6360 RESISTOR 10K 196 125W 0 25 0698 6360 A13R136 0698 6360 RESISTOR 10K 196 125W TC 0 25 0698 6380 A13R137 0699 0590 RESISTOR 15 758 1 125W TC 0 25 0699 0590 A13R138 0698 3456 RESISTOR 287K 1 125W TC 0 100 C4 1 8 TO 2873 F A13R139 0699 0596 RESISTOR 4 12K 1 125W TC 20 25 0699 0596 A13R140 0699 0596 RESISTOR 4 12
346. EST SET _ OUTPUT HEWLETT PACKARD L THRESH CNTS LEVEL ON 1 1 kHz STBY C MIN dB A A A A A A UP LEVEL 5 MEASUREMENT FILTER m 23 IMPULSE NOISE 1 MESSAGE tOW SET a i NOISE 3 KHz FLAT LI MID p roni 15 KHz FLAT C HIGH 8 1 PROGRAM TIMER amu 1 wee C 50 MONITOR PERIOD 1 DISPLAY F2 VOLUME DIAL NOISE TO 404 1004 GROUND MEAS FILTER rere F3 stop 4 STORE 2804 2713 DIAL and HOLD WET DIAI UP and 2 two wire circuits DIAL AND HOLD PROCEDURES The 4935A has the capability to hold wet dial up lines lines where the central office provides battery For example IODD Direct Distance Dialing network Dialing can be accomplished with butt in The procedure is as follows 2 Connect circuit to left 310 jack Push NOR switch to connect TRMT side to left jack Connect the butt in handset to the DIAL binding posts Push TRMT DIAL switch Use the butt in to dial the remote end of the circuit After the circuit is answered push the TRMT HOLD switch to hold the circuit Push the TRMT DIAL switch again to release it This disengages the dial circuitry and allows testing If the 4935A is designated the receive set press RCV HOLD switch and then push REV switch to connect RCV side to left 310 jack F
347. Errata Title amp Document Type 4935A Operating amp Service Manual Manual Part Number 94935 90029 Revision Date November 1966 HP References in this Manual This manual may contain references to HP or Hewlett Packard Please note that Hewlett Packard s former test and measurement semiconductor products and chemical analysis businesses are now part of Agilent Technologies We have made no changes to this manual copy The HP XXXX referred to in this document is now the Agilent XX XX For example model number HP8648A 15 now model number Agilent 8648A About this Manual We ve added this manual to the Agilent website in an effort to help you support your product This manual provides the best information we could find It may be incomplete or contain dated information and the scan quality may not be ideal If we find a better copy in the future we will add it to the Agilent website Support for Your Product Agilent no longer sells or supports this product You will find any other available product information on the Agilent Test amp Measurement website www tm agilent com Search for the model number of this product and the resulting product page will guide you to any available information Our service centers may be able to perform calibration if no repair parts are needed but no other support from Agilent 15 available Agilent Technologies Operating and Service Manual HP 4935A Transmission Impairment M
348. F 20 50VDC CER 08113 HP204751PF3C1 A3C114 0140 0228 2 1 CAPACITOR FXD 360PF 1 300VDC MICA 28480 0160 0576 A3C115 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER A3C116 0160 0576 5 CAPACITOR FXD tUF 20 CER A3C117 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 08113 HP204751PF3C1 A3C118 0160 6405 1 CAPACITOR FXD 01UF 1 100VDC 28480 0160 0576 A3C119 0160 0576 5 CAPACITOR FXD 1UF 020 50VDC CER 08113 HP204751PF3C1 A3C120 0160 6405 1 CAPACITOR FXD 019 1 100VDC MICA 121 0160 6320 9 CAPACITOR FXD 1700PF 1 100VDC MICA H id S D A3C122 0160 6318 1 CAPACITOR FXD 01UF 1 100VDC MICA 28480 0160 3291 123 0160 3291 7 CAPACITOR FXD 1200 1 100VDC 28480 0160 0218 13 124 0160 0218 2 CAPACITOR FXD 2400PF 1 300VDC MICA 08113 HP204751PF3C1 A3C125 0160 6320 9 CAPACITOR FXD 1700PH 1 100VDC MICA A3C127 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER pend A3C131 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 132 0160 0576 5 CAPACITOR FXD tUF 20 50VDC CER 56289 1500106 902082 133 0180 0374 3 CAPACITOR FXD 10UF 10 20VDC 08113 HP204751PF 3C1 A3C137 0160 6230 9 CAPACITOR FXD 1700 1 100VDC MICA A3C139 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER ERR degit A3C140 0160 0576 5 CAPACITOR F XD 1UF 20 50VDC CER 08113 HP204751PF3C1 A3C141 0160 6405 1 CAPACITOR FXD 01UF 1 100VDC MICA 28480 0160 0576 A3C142 0160 0576 5 CAPACITOR FXD 1UF 20
349. FL I RII rfe 9 TO Fe ME SPESE Bison A Bus B NOU u GRE CAUTIOM ois at Peg ey sq G WARNING tis E sig rast tt 35911 lt m PEP GE BOGE PA 3 55 BR E o HELTMZ WN PEA VBL SRE WARNING ws SAO RT ee Front and Rear Panel Controls Connectors Indicators Model 4935A Model 4935A CONTROLS CONNECTORS AND INDICATORS Power Cord Module Accepts power cord supplied with instrument Contains line fuse and PC board for selecting line voltage see Section II paragraph 2 9 for procedure to select line voltage WARNING Always connect power cord to a proper y grounded 3 wire power outlet N Do not connect more than 200VDC signal to terminals POWER button Switches power to front panel when in ON position In STBY position power is still applied to some circuits If unit has battery option there will still be power available to some internal circuits even in STBY position NOR and REV switches NOR switch depressed connects the left 310 jack to the transmitter and the right 310 jack to the receiver REV switch depressed connects the left 310 jack to the receiver and the right 310 jack to the transmitter
350. GULATOR The 14 regulator has a 14 v output voltage but otherwise is the same as the 5 v regulator circuit 8 135 14 V REGULATOR The 14 v regulator resembles a unity gain inverting amplifier with drive in only the negative direction Input comes from the 14 v supply so any malfunction in the 414 v regulator supply will affect in the 14 v regulated supply 8 136 There are 2 unusual features in this supply First a local zener voltage regulator provides the supply for the op amp to avoid excessive supply voltage since 14 vac line supplies provide more than 36 v between them Second a diode helps the op amp output to swing as close to the negative Vcc supply rail as possible 8 137 OVERVOLTAGE PROTECTION CIRCUIT The overvoltage protection circuit checks the voltage at 4 points in the power supply and shorts the 5 vac line supply if any of these voltages exceed normal levels The 5 v regulated output the 14 v regulated output and the unregulated 5 vac line supply voltages are checked with simple zener diode series resistor sense circuits The 14 v regulated output sense circult is more complex although it performs the same function When any abnormally high voltage is sensed a triac shorts 5 vac line supply and the inline fuse blows shutting the instrument down 8 138 JUMPERS There are two sets of jumpers in the power supply One set JU45 JU 14 and JU 14 isolates the regulated supply outputs from th
351. H SLEW RATE E DIP P PKG IC OP AMP H SLEW RATE O DIP P PKG IC OP AMP H SLEW RATE E DIP P PKG IC H SLEW RATE 8 DIP P PKG AMP H SLEW RATE 8 DIP P PKG IC OP AMP GP S DIP P PKG IC SWITCH ANLG DUAL 16 DIP C PKG IC OP AMP GP 8 DIP P PKG IC OP AMP GP E DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP LOW BIAS H IMPD QUAD 14 DIP IC OP AMP LOW BIAS H KB DUAL 8 DIP IC OP AMP GP 8 DIP P P SWITCH ANLG DUAL 16 DIP C PKG IC SWITCH ANLG DUAL 16 DIP C PKG IC OP AMP LOW BIAS H IMP QUAD 14 DIP P IC MULTIPLXR ANLG 16 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG MULTIPLXR ANLG 16 DiP P PKG IC OP AMP LOW BIAS HIGH IMPED IC OP AMP WB 8 DIP P PKG IC OP AMP LOW BIAS H IMPD 8 DIP P PKG OP AMP LOW BIAS H IMPD O DIP P PKG OP AMP LOW BIAS H IMPD S DIP P PKG IC OP AMP LOW BIAS H IMPD DUAL 8 OIP P IC OP AMP WE QUAD 14 DIP P PKG IC OP AMP GP 8 DIP P PKG IC SWITCH ANLG DUAL 16 DIP C PKG IC OP AMP LOW BIAS H IMPD IC OP AMP GP 8 DIP PKG IC OP AMP H SLEW RATE B DIP P PKG OP AMP LOW BIAS H IMPD 8 DIP P PKG SOCKET IC 16 CONT DIP DIP SLDR SOCKET IC IE DIP DIP SLDR SOCKET IC 16 DIP DIP SLDR A3 MISCELLANEOUS PARTS NUT HEX DBL CHAM 4 40 062 IN THK NUT HEX W ILKWR 4 40 084 IN THK WIRE 24AW 3 W 300B PVC 7X32 80C SNAP IN SPACER See introduction to this section for ordering information ndicates factory selected value Replaceable Parts LF353N LM338N VFC32KP 1826
352. H TABL s m I NsrArnAO REVISED 86 ee D SHEET OF 2 Manual Changes CIRCUIT APPLIES TO STANDARD UNITS ONLY CIRCUIT APPLIES TO P AR UNITS ONLY Figure 7 25 Receiver Board Schematic Diagram Sheet 1 of 2 7 35 01 79 L 1048201 p1eog 1 V 1 e Nds sm a 4 221 2 8 wv 504 6 d n 3 5 Le igie y BARG 4 a m w r w jenue v lt CANNHS 41 655 ore wmv nor m 0912 13918 31156940 037v07 3018 31130440 NO 730901 13 AN OG 1 8 2 24 2 38 x x L 9 8 8 8 8 8 9 8 6 8 6 8 6 8 2 3 8 H LO 62 5 5 r8 250 62 961 50 ro UH ca SH c 8 8 rH zsn zo 5 5 zo 8 9 gen zr TH orn 8 H or 9 9 wb sf 5 9 sr zen sr 8 4 sr gen sr 85 Zen rt 9 3 gen 3 stn or 23 ven 84 ten er Ud zn 9 4 LEN
353. HP PART NO QUANTITY Cable Batt Opt Interconnect Standoff Plastic Cable Rec Tran Interconnect Shouldered Fiber Washer Transistor Insulator Nut Hex No 4 Trans MTG Screw No 4 MTG Transistor Pwr PO Item 17 Nut Hex Solder Terminal Lock Washer Line Filter Module Rear Panel Assy Loaded Consists of Items 26 26A 27 28 29 32 33 34 35 36 for Repair Replacement only Rear Panel Unloaded Foot Rear Screw No 4 Binding Post Ground Screw Transformer MTG Cover Transformer Nut Transformer MTG Transformer T1 Standoff Nut Hex Plastic Nylon Washer 5 4 7 4 M Figure 6 2 Exploded View Assemblies and Cables Continued s be 22 BAL 8120 3181 5040 4467 8120 3126 3050 1 021 0340 0949 0590 0663 2200 0521 1853 05 12 2950 0006 0360 1 251 2190 0027 91350284 04935 60108 04935 00001 50404471 2200 0 143 151 O 0038 2360 0242 7100 288 2420 0023 9100 4205 2040 4468 2950 0043 3050 114 At 70 7 6 G WwW A Model 4935A DESCRIPTION Battery Assy Screw Washer Screw Battery Charger Board Receiver Assy Std Receiver Assy P Screw Shield Metal MTG Insulator Label ID Cable P O Battery Charger Board HP PART NO 04935 62904 2510 0103 3050 0001 2360 0117 04935430029 04935 60032 04935 60034 2360 0370 04935 04701 04935 45401 04935 800 14 8120 318
354. Hz Events The microprocessor will detect an error and blank the frequency display if l The 262 kHz signal fails to fill Counter 2 to the 1 4th full condition in approximately 63 milliseconds This is an indication that the 262 kHz clock NAND gate U17 or Counter no 2 is not operating properly gt If the Not Open signal fails to toggle within 50 milliseconds then this indicates that the frequency is not present or is less than 20 Hz 8 34 LEVEL MEASUREMENT 8 35 Level measurement is gated by an internal timed loop in the microprocessor The interval is accurately controlled by the microprocessor using the Inhibit command to counter no 1 as shown in Figure 8 4 items 12 through 16 8 36 There is no need to calculate the voltage to frequency converter output from the gated count since the ratio of counts is equal to the ratio of frequencies The microprocessor reads the level counts 10 v counts for the same 70 msec interval have been accumulated during calibration and have been stored in RAM for later recall There are 4 inputs 10 Volt Reference QRMS AVE PEAK detector signals oe w RCV BOARD BOARD p 5 cun DC TOM REF ANALOG LEV ORMS MUX CONVERTER CONTROL FREQ MUX AVE PEAK uP Arr Ly FREQUENCY Figure 8 2 Voltage To Frequency Conversion Characteristics 8 7 Service 8 8 Model 4935A VFC CHARACTERISTIC VOLTS DC 5
355. I re 3 C OD C dio t I C144 145 L gt Ol 6 i e 2 2 o 151 CN p 149 PHASE SH 9 LOCATOR GRID KEY LOCATOR GRID KEY Non Sequenced Non Sequenced TP15 CONN Figure 7 13 A13 Receiver Board Component Locator 7 25 Manual Changes Model 4935A 19 Pa IPS TPS Wt MID i0 DET pr e 1 n l i m 1 1 af he Lay TS 2 3 A al 2 3 dui uM eL pad 5 t i i 00 227 1 b b os SUAM 6 19 LE E a 2 B Pale 5 J i US JUMPLR WIRE angie 7 E ON DERE M rp c DN PHI i09 8765243527 hie qu C RIR 6 8206 B HE 019 27 4 HUNT 1 C SANE 196 Pe ieee INA e MY S4 hs je Y 3 Gt I 6 A Wa 2 3 2 T QUEE E
356. INANI 2 1 3504 35 kim 135 5 Tov NOD t M 5 33 isa j E 5378 32 3 I 3 P3 33 NIY9 6002 Fen T ajs aNs W315A Oana 01 KIYIYA Ad A NOTL2NF3 9 9 33 i zs ee J 066 dm 1 is E 1 Fr PERA 220712 3 1 word D ACC 43143AN02 11 VOLU sak E 5 EX wear zi t i fessus sie mossa i E E 3515 3S ifioNl RE NS ES PC a ec ce IU C 2 an Meee etch og A 2 nicis lt 54 819 1 2d coc wr curii ues ee u H Xm awer 2 1 Zum a aee i Bees i 2072 i loi ais 7 1 1
357. INE SUPPLY RELAY DRIVE CIRCUIT OURING INHIBIT OPERATION TURN ON el ruen orr _ RELAY DRIVE CIRCUITRY _ ON STBY FROM SWITCH Figure 8 14 Charger Board Block Diagram Service Model 4935A 8 141 Battery Charging 8 42 There arc three battery packs to charge The ac line supply provides necessary current to charge the batteries when the unit is plugged in and turned to STBY The batteries are regulated at approximately the C IO rate for cach battery so overcharge poses no problem When the power switch is turned on the charge current is reduced to a trickle charge Thus full charging of the batteries takes place only in STBY 8 143 The 14V current source circuit Figure 8 36 is an example of the instrument charging circuits The full charge current is supplicd by QI through R20 CR2 and CR20 hold the voltage across R20 nearly constant which keeps the charge current nearly constant When the instrument ts no base current flows through R23 so QI is off and therefore R22 provides a trickle charge 8 144 Power Source Selection 8 145 Battery power or ac line power to the unregulated power supplies is selected through a relay The battery supplies are selected by the relay whenever the batteries are charged the power switch is and the instrument is unplugged STBY mode switches the power to AC line power which sits at zero volts If
358. ISTOR NPN 2N3585 Si TO 66 35W TRANSISTOR NPN 2N3585 SI TO 66 PD 35W TRANSISTOR NPN SI PD 625MW FT 50MHZ TRANSISTOR NPN SI PD 300MW FT 200 TRANSISTOR NPN SI PD 625MW FT TRANSISTOR NPN SI PD 625MW FT 50MHZ TRANSISTOR NPN SI PD 625MW 50MHZ TRANSISTOR NPN SI 300MW 200MHZ TRANSISTOR NPN SI 625MW FT 50MHZ TRANSISTOR NPN DI PD 625MW FT 50MHZ RESISTOR 68 1K 1 125W F TC 0 100 RESISTOR 9 09 1 125W TC 0 100 RESISTOR 51 1 1 125W F TC 0 100 RESISTOR 68 1K 1 125W F IC 0 100 RESISTOR261 1 125W TC 0 100 See introduction to this section for ordering information Indicates factory selected value 04935 60027 04935 80009 04935 5082 4160 01600576 0160 0576 0160 0020 0160 0576 1500105 9035 2 30D207G016DF2 150D606X9006B2 1500608 900682 0160 0576 01 W 0576 0160 0576 0160 3878 0160 0576 0160 0576 150D684KX9035A2 0160 3879 0160 3879 0160 0576 0160 0576 0160 0576 150D684X9035A2 01 80 387 9 0160 3879 0160 0576 0160 0576 LM329DZ 1990 0649 1 sso 0540 1990 0540 1990 0540 1990 0540 1990 0540 1990 0540 1990 0540 1990 0540 1990 0805 1251 6947 1252 1134 12524 134 1251 6947 1251 6537 1251 6537 125 1 0257 2N3585 2N3585 MPS A42 1854 0071 MPS A42 MPS A42 MPS A42 1094 M MoS MS el 8 TO 6812 F 1 8 0 9091 8 0 5112 C4 1 8 TO 6812 C4 l amp TO 2610 F Replaceable Parts Model 4
359. ITOR FXD 4751PF 1 300VDCMICA 08113 HP204751PF3C1 A13C71 0160 6185 4 CAPACITOR FXD 1000PF 1 500VDC MICA 08113 HP204751PF 3C1 A13C72 0160 0576 5 CAPACITOR EXD 1UF 20 50VDC CER 28480 0160 0576 A13C73 0160 0576 5 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 Scc introduction to this section for ordering information 7 60 Indicates factory selected value Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued Reference HP Part Mfr Mfr Part Designator Number Description Code Number A13C74 0160 6188 CAPACITOR FXD 110PF 1 300VDC MICA HP204751PF3C1 A13C76 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 13 76 0160 0576 CAPACITOR FXD 1UF 20 50VDC CER 0160 0576 13 77 0160 0576 CAPACITOR FXD 1UF 20 40VDC CER 0160 0576 13 78 0160 0576 1UF 20 CER 0160 0576 13 79 0160 6317 CAPACITOR FXD 4751 1 300VDC HP204751PF3C1 13 80 0140 0225 CAPACITOR FXD 300PF 1 300VDC MICA 204751 1 13 1 0160 0218 CAPACITOR FXD 2400 1 300VDC MICA 0160 0218 A13C82 0160 3291 CAPACITOR FXD 1200PF 4 196 100VDC MICA 0160 3291 A13CB3 0160 0576 CAPACITOR FXD 1UF 2090 50VDC CER 0160 0576 13 84 0160 0218 CAPACITOR FXD 2400 1 300VDC MICA 0160 0218 A13C85 0160 6320 CAPACITOR FXD 1700PF 1 100VDC MICA HP204751PF3C1 A13C87
360. ITS ame h w eai 14 5V R6 of 14 9 09K RES OUT RES OUT R18 R2 BEEP CONTROL 6 TRIG 9 68 1K 16 2K __ x 015 a 5 CNT THR CNT THR ua RS 68 1K C4 14V C5 S C13 0 1 0 1 R30 10K 5 Vs R28 7 10K C16 1000PF VS AEN d MONITOR AMP i R36 5 MONi TOR VOLUME 5 CHARGE INDICATOR BEEPER CIRCUITS A2 SWITCH DISPLAY TN ASSY 14 POWER x 2 SWITCH DISPLAY ASSY 14V POWER 19 20 15 5 40 T m 35A2SH2 10 88 NOTES FROM A4 A14 TRANSMITTER ASSY FROM A4 A14 TRANSMITTER ASSY Service REFERENCE DESIGNATION WITHIN THIS ASSEMBLY ARE ABBREVIATED ADD ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTION UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE IN MICROF ARADS INDUCTANCE IN MICROHENRIES ASTERISK INDICATES FACTORY SELECTED COMPONENT AVERAGE VALUE SHOWN S SIGNAL GROUND DeD GITAL GROUND T amp TRANSMITTER GROUND Figure 8 27 A2 Switchboard Schematic Diagram Sheet 2 of 2 8 73 tL8 207 JUaUOdWOD Janlsoay EL V 82 8 aniy 299 98 994 5 P B gt 8 5 L
361. In LEVEL FREQUENCY the STORE function enables frequencies on right display to he stored for recall using the F1 F2 F3 or F4 keys The STORE function is also used to change the SF SKIP Frequency IMPULSE NOISE Section Impulse Noise controls are used in KCV and in conjunction with the MEASUREMENT section IMPULSE NOISE mode Four keys control this section PERIOD F1 404 DISPLAY F2 1004 START RESET F3 2804 STOP 4 2713 PERIOD Sets the instrument timer for the impulse noise test 5 MIN 15 MIN 60 MIN or NON STOP Also provides the F1 404 Hz preprogrammed frequency for LEVEL FREQUENCY Mode DISPLAY Changes the display through each of the threshold values and their impulse noise counts then displays the TIMER setting selected by the PERIOD key Also provides the F2 1004 Hz preprogrammed frequency for LEVEL FREQUENCY Mode START RESET Starts the impulse noise test and resets the count to zero for every threshold Also provides the F3 2804 Hz preprogrammed frequency for LEVEL FREQUENCY Mode STOP Stops the impulse noise test but retains the displayed count values Also provides the F4 2113 Hz preprogrammed frequency for LEVEL FREQUENCY Mode Figure 3 1 Front and Rear Panel Controls Connectors Indicators Continued Model 4935A Operation OUTPUT LEVEL Control Adjusts the transmitter output level continuously from 40 dBm to 13 dBm Output level is displayed on left display MONITOR VOLUME Control and Speaker Permits
362. K 196 125W TC 0 25 0699 0596 A13R141 0699 0594 RESISTOR 2 21K 196 125W TC 0 25 0699 0596 A13R142 0699 0594 RESISTOR 2 21K 1 125W 0 25 0699 0594 A13R143 0698 8337 RESISTOR 10 7K 1 125W F TC 0 50 MF4C1 8 T2 1072 B A13R144 0698 8068 RESISTOR 4 99 25 125W TC 0 25 MF4C1 8 T9 4991 C A13R145 0699 0597 RESISTOR 2 26 196 125W 0 25 0699 0597 138146 0698 6447 RESISTOR 683 8 1 125W TC 0 25 0698 6447 A13R147 0698 6446 RESISTOR 2 162K 1 125M TC 0 25 0698 6446 A13R148 0699 0592 RESISTOR 7 741K 1 125W TC 0 25 0698 0592 A13R149 0698 6360 RESISTOR 10K 1 125W TC 0 25 0698 6360 A13R150 0698 6360 RESISTOR 10K 1 125W F 0 25 0698 6360 138151 0699 0590 RESISTOR 15 758 1 125W F TC 0 25 0689 0590 A13R152 0757 0462 RESISTOR 75K 1 125W F TC 0 100 C4 1 8 TO 7502 F A13R153 2100 3884 RESISTOR TRMR 10K 10 17 TRN 2100 3884 A13R154 0698 4520 RESISTOR 43K 1 125W TC 0 100 C4 1 8 TO 1433 F A13R155 0698 6360 RESISTOR 10K 1 125W F TC 0 25 0698 6360 0698 6360 C4 1 8 TO 7152 F RESISTOR 10K 1 125W TC 0 25 RESISTOR 71 5K 1 125W TC 0 100 0698 6360 0698 4505 138156 138157 A13R158 0699 0597 RESISTOR 2 26K 1 125W F TC 0 25 0699 0597 A13H159 06
363. LOGIC ON J THE CONTROL INPUT 6 T i 200PF T 31 26 31 28K 000 3KHZ FLAT FILTER 5 2 FLAT FILTER C104 2400PF gt 197 5138 2 20 2 2UF i iu w pee r 1019 cu 8102 NOTCH R132 NOTCH 2 RII 8134 5009 RISG lik 49 5000 146 129 34 334 146 01 00 t 01 14 ciol c lt Cile 0 142 i W460 8138 90 1 42 1 4 13 Ri i 10 164 jak l V 16 20519 13 668K 5 E L iv Y cit V i 0 R100 RIBI IB 7 I lt 12 34 334 14 5 758 13 665 lt gt ana es Bios agio a Ld FZas 1025 NC NG t8l 1813 12 11 0 9 m 78 j Jut 4 NF M 2 1 14 6 fe Manual Changes NOISE TO GNO VERSION RIBI looo cae 476 1 PF 01 I i4V nae c5a 29 4k Rag 912 gages TOOP i 25 5K 26 5K 5 z 7 C95 5 E I 400PF
364. LOGIC ON THE CONTROL INPUT 7 27 2 Pi 501 4936A 14 ANALOG OUT ur e puce pep 3 s Eb ir u Be C75 r if V I N 24 2 2 13 sao 2 23 5 d 3 22 5 i 4 4 m 2 31 4 2 5 5 19 5 36 5 y 20 5 5 5j 5 33 a 1 al 1 7 8 6 34 7 a a 33 a 17 32 9 16 10 3 15 Cis 16 E 30 E 3 2 2 18 12 29 t2 13 5 3 3 14 13 28 14 ADJ 4 4 14 127 C3A2 9 TE 5 s fiz 13 24 TP TP2 P 3 2 6 16 25 52505 7 10 17 2 3 e c tar TE 2 9 16 U R 19 22 4 s wi i sP Mi n zi 3 iis Jui SINE T Q ip 3 T9208 5 CLK 5 4 amp a 13 2 RI R Is 7 fhe 1 14 I 14 14 i He d V i 5 7 16 R 2 lis 2 13 2 13 2 13 oe j a is 4 17 2 3 3 4 3 2 af 2 12 3 12 z U q ia 5 3 1 ai T i I 4 E 4 B 4 i M 2 4 o 5 s fo Sf s 10 si s o tas s 5 9 2 r a S el 2 i9 9 68 a 9 6 438 2 16 T R4
365. LPAE a e 22 221 L gt gt gt i 1 DO a eat 3 SO p CR IMP PEAK __ ENS eee SV 2 S De Sb s r 542r 3 b hy I T HIOOK H 4 CODE a7 CRANA ys woac 7727 _ __________ eae 20 _ D Cte ee aaa 1 1 t ene Be n p gv M EE 4 ee De sm QRMS DETECTOR p ES t n 864 Jn ee U V M Gd 147 cic T i 14 rr C34 d pe diu R72 Aes e OK 5 nee orm 1 r CRIS 10K f BE I 6 9 C44 3 s 0 ea v 256 abe RTI Tte 0 1 2 5K 19 6K rv eL DE E Wes RaT Ov w 2 5 dy R33 Q amp OFFSET DADO R32 VA 511 14 14 QRMS NEN i 4 QRM 7 lt v 611 o PAR PEAX T GNDEO Nf nn STO UNIT 129 cbe 3 gt i s000 4719 19 6 RAE AVE Pinetree maa i Y
366. LXR ANLG 16 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG MULTIPLXR ANLG 16 DIP P PKG IG OP AMP LOW BIAS HIGH IMPED IC OP AMP WB 8 DIP P PKG IC OP AMP LOW BIAS H IMPD 8 DIP P PKG AMP LOW BIAS H IMPD 8 DIP P PKG IC OP AMP LOW BIAS H IMPD 8 DIP P PKG IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P IC OP AMP WB QUAD 14 DIP P PKG IC OP AMP GP 8 DIP P PKG IC SWITCH ANLG DUAL 16 DIP C PKG IC OP AMP LOW BIAS H IMPD IC OP AMP GP 8 DIP PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC AMP LOW BIAS H IMPD 8 DIP P PKG SOCKET IC 16 CONT DIP DIP SLOR SOCKET IC 16 CONT DIP DIP SLDR SOCKET IC 16 CONT DIP DIP SLDR A3 MISCELLANEOUS PARTS NUT HEX DBL CHAM 4 40 THD 062 IN THK NUT HEX W LKWR 4 40 THD 094 IN THK WIRE 24AWG W 300B PVC 7X32 80C SNAP IN SPACER See introduction to this section for ordering information Model 4935A Mfr Part Number 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1251 6947 LF353N LM339N VFC32KP 1826 1071 1826 0742 AD7524JN CD4042BE CD4042BE CD4042BE MC14504BCP CD4051RE MC34081P LF351N LF353N CD4042BE 1826 1071 2507 5 2507 5 2507 5 2507 5 2507 5 LM310N 1H504CDE LM310N MC34081P HA3 2507 5 LF347BN LM310N LF 353N IH5043CDE IH5043CDE LF347BN DG508CJ HA3 2507 5 DG508CJ SC77968L1
367. MBLY Remove Case Place instrument bottom up on bench and remove the 4 screws holding the feet on Hold the two halves of the case together and turn the instrument upright Remove the top half of the case by lifting it upward The case top should separate from the rest of the instrument without pulling other parts with it Slip the handle out of the lower case half Remove the 4 black plastic posts from their holes in the receiver board top PC board Disconnect W5 monitor amp cable Remove 3 screws securing the shield plate to the rear panel a The receiver board with shield plate will now fold up and over and will lay on the bench beside the rest of the instrument when access is required b If you have the Diagnostic Service Kit P N 04935 6001 4 1 Lift the receiver board 2 Remove the 2 left hand black plastic parts spacers between transmitter and receiver board 3 Slip service kit support posts in place of posts removed in step 6 above 4 Slip the receiver shield plate into the service kit support posts to support receiver board in a vertical position 5 Connect the monitor amp cable to J1 using the extension cable provided with the service kit RECEIVER BOARD SHIELD PLATE BATTERY CHARGER BOARD DISASSEMBLY 1 Disconnect the cable between the switch board and the receiver board receiver board Disconnect W5 cable from monitor amp at receiver board Disconnect W2 cable from the transmitter
368. MHZ TRANSISTOR PNP SI PD 310MW 250MHZ TRANSISTOR NPN St PD 350MW 300MHZ TRANSISTOR PNP St PD 310MW FT 250MHZ TRANSISTOR PNP SI PD 310MW 250MHZ TRANSISTOR PNP SI 310MW 250MHZ TRANSISTOR NPN SI PD 350MW FT 300MHZ TRANSISTOR NPN SI 350MW FT 300MHZ TRANSISTOR NPN SI 350MW FT 300MHZ TRANSISTOR NPN 2N647 SI TO 220AB TRANSISTOR PNP SI PD 310MW FT 250MHZ TRANSISTOR PNP 2N6476 SI TO 220AB RESISTOR 619 1 125W TC 04 100 RESISTOR 100K 1 125W F TC 0 100 RESISTOR 51 1K 1 125W TC 0 100 RESISTOR 10K 1 125W F TC 0 100 RESISTOR 1K 1 125W TC 0 100 RESISTOR 10K 1 125W TC 0 100 RESISTOR 100K 1 125W F TC 0 100 RESISTOR 121 78K 1 125W TC 0 25 RESISTOR 10K 1 125W 0 100 RESISTOR 140 158 1 125W TC 04 25 RESISTOR 100K 1 125W F TC 04 25 Sec introduction to this section for ordering information Indicates factory selected value Replaceable Parts 04935 60029 150D105X9035A2 150D156X9020B2 1500476X9035S2 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 A115F 1902 0041 1901 0050 1901 0050 1902 0554 1902 0184 1902 0184 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 A115F A115F 2110 0712 2110 0712 2110 0712 1251 4245 1251 4245 1251 4246
369. MOS 04713 MC45368CP A4U10 1826 0411 0 IC TIMER CMOS 04713 MC14536BCP 4011 1820 1956 7 IC LCH CMOS COM CLOCK QUAD 01928 CD4042BE AAW12 1820 1956 8 IC LCH CMOS COM CLOCK QUAD 0192B C404 2BE AAW13 1820 2566 8 1 IC BFR CMOS LINE DRVR QUAD 27014 MM74C240N A4U14 1926 0728 2 IC PRECISION GEN PURPOSE VOLT REG 28480 1828 0728 4016 1820 1745 3 1 IC GATE CMOS NOR QUAD 2 INP 04713 MC14001BCP A4U16 1820 2576 0 3 IC GATE CMOS NAND QUAD 2 INP 04713 MC14011BCL 4017 1820 2576 0 GATE CMOS NAND QUAD 2 INP 04713 MC14011BCL 4018 1820 0939 5 FF CMOS D TYPE POS EDGE TRIG DUAL 01928 CD4013AF 4119 1820 2576 0 IC GATE CMOS NAND QUAD 2 INP 04713 MC 14011BCL A4U20 1820 1960 4 1 IC GATE CMOS NAND DUAL 4 INP 04713 MC 14012BCP A4U21 1826 0667 8 1 IC OP AMP LOW BIAS H IMPD 8 DIP P PKG 27014 LF351N A4U23 1820 1977 3 1 IC OSC ECL 04713 MC12061P 4024 1826 0712 4 1 IC AMP LOW BIAS H IMPD DUAL 27014 MC353N A4U25 1826 0138 8 1 IC COMPARATOR GP QUAD 14 DIP P PKG 01295 LM339N 4026 1820 1956 8 IC LCH CMOS COM CLOCK QUAD 0192B CD4042BE A4U27 1820 1956 8 IC LCH CMOS COM CLOCK QUAD 01928 CD4042BE A4U28 1820 1956 8 IC LCH CMOS COM CLOCK QUAD 0192B CD4042BE 4129 1820 1956 8 IC LCH CMOS COM CLOCK QUAD 0192B CD4042BE 41130 1820 1956 8 IC LCH CMOS COM CLOCK QUAD 01928 CD4042BE A4U32 1820 1478 0 1 IC CNTR ASYNCHRO 01698 SN57246N A4U33 1826 0508 6 1 IC CONV 10 B D A 16 DIP C PKG 24355 AD561JD A4U 34 1820 1441 6 5 IC ADDR TTL LS BIN FULL ADDR 4 BIT 01295 SN
370. N Add 19 HP Part No 1901 0376 DIODE GEN Add A3CR20 HP Part No 1901 0376 DIODE GEN Add A3CR21 HP Part No 1901 0376 DIODE GEN Add A3CR22 HP Part No 1901 0376 DIODE GEN Add A3CR23 HP Part No 1901 0376 DIODE GEN Add A3CR24 HP Part No 1901 0376 DIODE GEN Add A3CR25 HP Part No 1901 0376 DIODE GEN Add A3J2 HP Part No 1250 0257 CONNECTOR Add A3J3 HP Part No 1250 0257 CONNECTOR Change A3JU7 to HP Part No 1200 0473 CONNECTOR Add A3R48 to HP Part No 0698 8638 RESISTOR 3 16K 1 Add A3R49 to HP Part No 0698 6445 RESISTOR 6 838K 1 Page 6 14 Table 6 3 Replacement Parts A3 Receiver Board Change A3R62 to HP Part No 0699 0666 RESISTOR 1 705K 19 Change A3R63 to HP Part No 0699 0666 RESISTOR 1 705K 1 Change A3R72A to HP Part No 0699 0665 RESISTOR 1 248K 1 Change 7 to HP Part No 0699 0669 RESISTOR 3 288K 19 7 3 Manual Changes Model 4935A CHANGE 5 Cont d Change A3R74 to HP Part No 0699 0669 RESISTOR 3 288K 1 Change A3R91 to HP Part No 0699 0665 RESISTOR 1 248K 1 Change A3R122 to HP Part No 0698 3268 RESISTOR 11 5K 1 Change A3R123 to HP Part No 0757 0419 RESISTOR 681 OHM 1 Page 6 15 Table 6 3 Replacement Parts Receiver Board Delete ABTP21 25 HP Part No 1251 6947 TEST PIN Delete A3R206 Part No 1810 0369 RESISTOR NETWORK LOOK x 5 Delete A3R207 HP Part No 0698 6445 RESISTOR 6 838K 1 Add A3R130 HP Part No 0757
371. NANNY 2 YNYS 3412238 uV d SION OL 1VN9IS SYOLVIDNONNY i 3SION 35717941 1 i 1 5 8 35108 REN ldi Yy 4135 45 w A ALIM gt O d i 39VSS3W 2 SHOLVIONANNY 9317113 li 9 E QO H3d 1185 05 01 ae 4 13538 13915 dOIS NON 38915 P I 3 331173 widsig HS3HHl 3610 zi 23 NMOC 4315 4S 5 01912 i a NONNY VANVd LINON gt T s G oe M J w Q s U as 015 8670 0860 9690 0560 NMOHS H LIM T3NVd 14043 iV IIAG 0L 8 102207 62 8 eJnBrj 2 lors g Cr LOLOT X 0000 222 88 81 HSE6P 2022 8 AZM eon en ERG 185 Cle e 4211 E E i Y VEIT i NS 521111 _ E f Ls NS 650 250 950 550 PS esa esa EN b i
372. NCY OUTPUT EVEL DISTORTION 4 22 Model 4935A Performance Tests PERFORMANCE TESTS p n 4KHZ LOW PASS R OUTPUT AMPLIFIER 4 kHz Low Pass Filter Circuit 20 dB Amplifier Circuit Figure 4 13 Filter Circuits Table 4 14 Filter Circuit Parts List REFERENCE HP DESIGNATOR PART NO DESCRIPTION 0160 3468 0160 3468 0160 6405 0160 6185 1901 0040 1901 0040 0698 7408 0757 0442 0757 0442 0757 0465 0757 0442 0757 0465 0757 0442 0698 3450 0698 3450 0698 3151 0698 7408 1826 0712 3101 0973 3101 0973 1251 3677 151 0 0076 151 0 0076 151 0 0076 1251 1780 0 12uf 5 Q 12uf 5 10K pf 1 1K pf 1 Diode Diode 6000hm 0 1 1O0Kohm 1 1 0Kohm 1 100Kohm 1 1 1 100Kohm 1 1 4 1 42 2Kohm 1 42 2 1 2 87 1 6000hm 0 1 IC OP Amp DPDT Switch DPDT Switch 310 Jack Binding Post Binding Post Binding Post BNC Connector The Diagnostic Service Kit HP 04935 60014 contains a test board with this circuit 4 23 Performance Tests Model 4935A PERFORMANCE TESTS ABBREVIATED DISTORTION TEST I I Jisconnect all cables from 4935A input 2 4935A select POWER ON DISPLAY RCV SETUP press in both NOR and REV buttons MEASUREMENT SIGNAL NOISE OUTPUT LEVEL adjust to 0 0 dBm each filter in Table 4 15 displayed level should be within given range I
373. NNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT 025 5 52 SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT 025 5 52 SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 4 IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P 4 IC COMPARATOR GP QUAD 14 DIP P PKG 1 iC CONV V FREQ 14 DIP P PKG 1 PRECISION 10V REFERENCE AD581J 4 IG CONV B B D A 160DIP P PKG 8 4 IC LCH CMOS COM CLOCK QUAD 8 IC LCH CMOS COM CLOCK QUAD 8 IC LCH CMOS COM CLOCK QUAD 3 1 XLTR CMOS TIL TO MOS HEX 1 IC MULTIPLXR 8 CHAN ANLG 16 DIP P PKG 4 IC OP AMP GP 8 DIP P PGK 5 IC OP AMP LOW BIAS H IMPD 8 DIP P PKG IC OP AMP LOW BIAS H IMPD DUAL B DIP P IC LCH CMOS COM CLOCK QUAD IC OP AMP 8 IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG 3 IC OP AMP GP 8 DIP P PKG IC OP AMP GP 8 DIP P PKG OP AMP GP 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG 2 IC AMP LOW BIAS H IMPD QUAD 14 DIP IC OP AMP LOW BIAS H IMPD DUAL B DIP IC OP AMP GP 8 DIP P PKG IC SWITCH ANLG DUAL 16 DIP C PKG IC SWITCH ANLG DUAL 16 DIP C PKG IC OP AMP LOW BIAS H IMP QUAD 14 DIP P 2 MULTIPLXR ANLG 16 DIP P PKG IC OP
374. NOMINAL 25 C CAPACITY 0 2 4 6 8 10 12 14 16 18 20 CHARGING TIME IN HOURS 0 1 CHARGE RATE Figure 1 2 Charge Acceptance at Various Temperatures Model 4935A Installation SECTION II INSTALLATION 2 l INTRODUCTION 2 2 This section contains information initial inspection preparation use power requirements and storage and shipment Table 2 1 shows all power cords available 2 3 INITIAL INSPECTION 2 4 Inspect the shipping container for damage the container or cushioning material is damaged keep it Check the contents of the shipment for completeness then check the unit mechanically and electrically Refer to Section IV for electrical checks 2 5 If the unit is mechanically damaged or fails electrical tests notify the carrier and the nearest HP office listed at the rear of this manual Hewlett Packard will arrange for repair or replacement of the instrument without waiting for claim settlement CAUTION Before connecting this instrument to an AC power source be sure that the rear panel line module is set to the same voltage as the AC source and that the correct fuse for that AC voltage is installed SS Amp for 120 Vac 200 Amp for 220 Vac c 2 2 6 PREPARATION FOR USE eAS 2 T POWER REQUIREMENTS 2 8 This instrument requires a power source of 100 120 220 or 240 Vac 5 10 48 to 66 Hz single phase Power consumption is no more than 25 Vac 2 9 LINE VOLTAGE
375. Number Reference Designator A2R25 0699 0658 RESISTOR 450 2590 5W 0 50 0699 0658 A2R26 0699 0658 RESISTOR 450 25 5W 0 50 0699 0658 A2R27 0757 0346 1 RESISTOR 10 1 125W 0 100 4 1 8 10 0 A2R28 0757 0442 RESISTOR 10K 1 125W 0 100 C4 1 8 TO 1002 F A2R29 0757 0447 1 RESISTOR 16 2K 1 125W TC 0 100 C4 1 8 TO 1622 F A2R30 0757 0442 RESISTOR 10K 1 125W 0 100 4 1 8 0 1002 A2R35 2100 3857 1 RESISTOR VARIABLE 10K 20 SPECIAL 2100 3857 A2R36 2100 3859 1 RESISTOR VAR CONTROL CP 50K 20 10CW 2100 3858 A2R51 0698 8827 2 RESISTOR 1M 1 125W TC 0 100 0598 98927 A2R52 0757 0199 2 RESISTOR 21 5K 1 125W 0 100 C4 1 8 TO 2152F A2R53 2100 3164 2 RESISTOR TRMR 10 20 C SIDE ADJ 17 TRN 43P100 A2R54 0698 3429 2 RESISTOR 19 6 1 125W 0 100 PME55 1 8 TO 1 9R6 F 2 56 0757 0401 8 RESISTOR 100 190 125W TC 0 100 4 1 8 0 101 A R57 0757 0401 RESISTOR 100 1 125W 0 100 C4 1 8 T0 101 F A2R58 0757 0401 RESISTOR 100 1 125W TC 0 100 C4
376. OCKET DSPL 14 PIN DIP SLDR SOCKET DSPL 8 DIP SLDR 2100 3164 0698 3409 0757 0401 0757 0401 0757 0401 0757 0401 0698 8827 0757 0199 2100 3164 0698 3429 0757 0401 0757 0401 0757 0401 0757 0401 3101 2124 3101 2391 3101 2391 3101 0499 3101 0499 3101 0499 3101 0499 3101 0499 3101 0499 3101 0499 3101 0499 3101 0499 3101 0499 1970 0078 1970 0078 9160 0273 1251 6947 1251 6947 1820 2132 1820 2132 Ocio AON A gt G CO e ouo WOW CO Co CO I O p O See Introduction to this section for ordering Information Indicates factory selected value 6 10 Model 4935A P Part umber 0340 0992 0380 1013 2200 0173 2260 0009 2360 0197 0590 0076 5041 0201 5041 1931 5041 1932 5041 1933 5041 1934 5041 1935 5041 1936 9041 1938 5041 1939 04935 61602 2190 0138 O 02 Description AZ MISCELLANEOUS PARTS INSULATOR TRANSISTOR SPACER RND 888 IN LG 115 IN ID SCREW MCH 4 40 1 IN LG 82 DEG NUT HEX W ILKWR 4 40 094 IN THK SCREW MC H 6 32 375 IN LG PAN HO POZI NUT HEX W LKWR 6 32 THD 094 IN THK KEY CAP WHITE POWER SWITCH KEY CAP NOR n TRMT KEY CAP REV REV TRMT KEY CPA DIAL SETUP TRMT KEY CAP HOLD SETUP TRMT Rt KEY CAP BRDG SETUP TRMT R KEY CAP 135 SETUP TRMT R KEY CAP 800 5
377. ON 2 UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE IN MICROFARADS INDUCTANCE IN MICROHENRIES 3 ASTERISK INDICATES FACTORY SELECTED COMPONENT AVERAGE VALUE SHOWN FROM 44 r 35 TRANSMLTTER ASSY 4 S SIGNAL GROUND D DIGITAL GROUND T TRANSMITTER GROUND gt TRANSMITTER ASSY 16 BLACK BROWN CLEAR aa RECEIVER ASSY ZZ CABLE TO INPUT TRANSF ORMER RED ORANGE TO 4 TRANSMITTER ASSY OUTPUT TRANSFORMER P O PI FROM A4 TRANSMITTER ASSY P O J6 J7 TO a FRONT PANEL ASSY Manual Changes Figure 7 22 A2 Switchboard Schematic Diagram 7 33 2042207 JuaUCdWOD 22 4 91530 i 201 8 3 een 23 639 23 id zen I H erig 43 esh 82 5 4 itn 23 882 24 otn 89 3 63 620 43 448 9 0 8 3 azn LH 93 69 den rH 3 595 62 5 3 amp 3 wy 60 ora 09H La SH 93 gozo 3 3 93 60 1020 SH 53 9912
378. P ADJ 17 TRN RESISTOR 10K 1 125W TC 0 100 RESISTOR 19 6K 1 125W F TC 0 100 RESISTOR 12 1K 1 125W F TC 0 100 RESISTOR 21 5K 1 125W 1C 0 100 RESISTOR 750 1 125W F TC 0 100 RESISTOR 19 6K 1 125W F TC 0 100 RESISTOR 750 1 125W 0 100 RESISTOR 1K 1 125W TC 0 100 RESISTOR 2 37K 1 1252 RESISTOR 2 37K 1 125W RESISTOR 1 21 1 125W TC 0 100 RESISTOR 2 15K 1 125W F TC 0 100 RESISTOR TRMR 500 10 TOP ADJ 17 TRN RESISTOR 100K 1 125W F 0 100 RESISTOR 232K 1 125W 0 100 RESISTOR 365K 1 125W F TC 0 25 RESISTOR 134K 1 125W 0 25 RESISTOR 113K 1 125 TC 0 100 RESISTOR 100K 1 125W 0 50 RESISTOR 10K 1 125W 0 25 RESISTOR 100 1 125W TC 0 50 RESISTOR 1 125W 0 25 RESISTOR 29 4K 1 125W F TC 0 100 RESISTOR 29 4K 1 125W F TC 0 100 RESISTOR 25 5K 1 25W TC 0 25 RESISTOR 25 5K 1 125W 0 25 RESISTOR 1K 1 125W 0 100 RESISTOR 1 11K 1 125W F TC 0 25 RESISTOR 10K 1 125W 0 25 RESISTOR 3 16 1 125W 0 25 RESISTOR 6 838K 1 125W F TC 0 25 RESISTOR 186 365 125W 0 25 RESISTOR 240 738K 190 125W 0 25 RESISTOR 16 9K 1 125W F TC 0 50 RESISTOR 12 918K 1 125W 0 25 RESISTOR 18 171K 1 125W 0 25 RESISTOR TRMR 5K 10 C TOP ADJ 17 TRN introduction to this section for ordering information Indicat
379. PWR SW 14V REG NC NOTE K1 DRAWN AS UNENERGIZED OPERAT ON P O 5V UNREG P1 14V UNREG 14V UNREG 18 17 16 ON OFF 4935 5 10 88 H Figure 8 42 A5 Charger Board Schematic Diagram 8 93
380. Part umber 04935 60108 9135 0284 9100 4205 0360 1251 0890 0311 0890 0100 1400 0249 1510 0038 2190 0027 2360 0242 2420 0023 2950 0006 8150 2846 04935 00001 7100 1288 04935 61601 04935 61602 AOS CQ G Q Description A6 REAR PANEL ASSEMBLY REAR PANEL ASSEMBLY LINE MODULE FILTER TRANSFORMER AC POWER TERMINAL SLDR LUG FOR 12 SCR TUBING HS 187 D 083 RCVD TUBING HS 093 D 046 RCVD CABLE TIE O62 625 DIA NYL BINDING POST ASSY SGL THD STUD WASHER LK HLCL 1 4 IN 255 IN ID SCREW MACH 6 32 1 25 IN LG NUT HEX W LKWR 6 32 THD 094 IN THK NUT HEX DBL CHAM 1 4 32 THD WIRE 18AWG 300V PVC 19X30 105C REAR PANEL BLAN TRANSFORMER COVER JUMPER CABLE JUMPER CABLE Replaceable Parts 04935 60108 0960 0443 9100 4205 0360 1251 ORDR BY DSCRPTN ORDR BY DSCRPTN PL1M 8 1510 0038 2190 0027 ORDR BY DSCRPTN ORDER BY DSCRPTN ORDR BY DSCRPTN 8150 2846 04935 00001 7100 1288 04935 61601 04935 61602 Sec introduction to this section for ordering information ndicates factory selected value 6 25 Replaceable Parts Model 4935A P Part fr fr Part 8 oy Description umber A13 RECEIVER BOARD Par Units only Referenca signator A13 04935 60034 RECEIVER BOARD WITH PAR 04935 60034 A13C1 0180 3124 CAPACITOR FXD 75UF 100 2096 300VDC AL 0180 3124 A13C2
381. R BATTERY ASSY OPT 001 amp 003 TAPE INDUSTRIAL 25 TAPE INDUSTRIAL FOAM BATTERY HOLDER BATTERY 15 6V BATTERY 15 6V BATTERY 6V NUT HEX 3 8 32 NYLON WASHER CARRYING CASE 7 72 Indicates factory selected value Model 4935A Mtr Part Number 2110 0012 2110 0004 8120 3126 04935 60019 04935 60009 0340 0949 0370 1089 0370 1091 0403 0294 5041 6750 1258 0141 1400 0510 1510 0076 ORDER BY DESCRIPTION ORDER BY DESCRIPTION ORDER BY DESCRIPTION ORDER BY DESCRIPTION ORDER BY DESCRIPTION ORDER BY DESCRIPTION ORDER BY DESCRIPTION ORDER BY DESCRIPTION ORDER BY DESCRIPTION 3050 0001 3050 0067 3050 0100 0590 0076 5040 4475 5040 4476 7120 1155 7120 2388 7120 4184 7120 5370 7205 0356 8120 1521 8120 3126 5040 4467 5040 4468 5040 4469 5040 4470 5040 4471 5060 7159 04935 00002 04935 90018 04935 90023 04935 00007 04935 60011 0460 0880 0460 1601 1400 1076 1420 0284 1420 0284 1420 0285 2950 0043 3050 1114 1540 0835 Model 4935 8 1 8 2 SECTION VIII SERVICE RECEIVER TRANSMITTER SWITCH AND MP AND COUNTING DISPLAY OPTIONAL BATTERIES AND CHARGER BOARD POWER SUPPLY Figure 8 1 4935 Block Diagram GENERAL INFORMATION Service FRONT PANEL JACKS The 4935A is a Transmission Impairment Measurement Set which provides both the test signals and measurement capabilities required for testing the transmission characteristics of communications
382. R 19 6 1 125WF TC 0 100 PMESS 1 8 TO 19R6 F RESISTOR 100 1 125WF 0 100 C4 1 8 TO 101 F RESISTOR 100 1 125WF 0 109 C4 1 8 TO 101 F RESISTOR 100196 125W F TC 0 100 C4 1 8 TO 101 F RESISTOR 100 1 125W TC 0 100 C4 1 8 TO 101 F SWITCH PB ALTNG 25A 1 15 3101 2124 SWITCH PB Z STATION 15MM C C SPACING 3101 2301 SWITCH PB P STATION 15MM C C SPACING 3101 2391 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 SWITCH PB J STATION 10MM C C SPACING 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0499 SWITCH PB J STATION 10MM C C SPACING 3101 0499 SWITCH PB 5 STATION10MM C C SPACING 3101 0499 SWITCH PB 5 STATION 10MM C C SPACING 3101 0489 TUBE ELECTRON SURGE V PICTR B1 A350 15 TUBE ELECTRON SURGE V PICTR B1 A350 15 LOUD SPEAKER 9160 0273 CONNECTOR SGL CONT PIN 025 IN BSC 1251 6947 CONNECTOR SGL CONT PIN 025 IN BSC 125 6947 IC ORVR CMOS LED DRVR ICM7218A IC DRVR CMOS LED DRVR ICM7218A IC TIMER TTL IC AUDIO AMPL PWR 8 DIP P PKG IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P SOCKET DSPL 14 PIN DIP SLDR SOCKET DSPL 14 PIN DIP SLDR SOCKET DSPL 14 PIN DIP SLDR SOCKET DSPL 14 PIN DIP SLDR SOCKET DSPL 14 DIP SLDR SOCKET DSPL 14 DIP SLDR SOCKET OSPL 14 PIN DIP SLDR SOCKET DSPL 14 PIN DIP SLDR S
383. R 909 1 5W TC 0 100 0757 0819 A14R4 0757 0442 9 RESISTOR 10K 1 125W TC 0 100 4 1 8 0 1002 1485 0698 8827 4 RESISTOR 1M 1 125W F TC 04 100 0698 8627 1486 0698 8826 3 RESISTOR 825K 1 125W TC 04 100 0698 8826 A14R7 0698 0826 3 RESISTOR 825K 1 125W TC 04 100 0698 8826 1488 0698 8827 4 RESISTOR 1M 1 125W TC 0 100 0698 8827 1439 0698 9827 4 RESISTOR 1M 1 125W 04 100 0698 8827 14810 0698 8826 3 RESISTOR 825K 1 125W F 0 100 0698 8826 14811 0698 824 1 RESISTOR 562K 1 125W 0 100 0698 8824 14 812 0757 0442 9 RESISTOR 10K 1 125W F TC 04 100 4 1 8 0 1002 A14R 13 0757 0465 6 RESISTOR 100K 1 125W 0 100 4 1 8 0 1003 14814 0698 6360 6 RESISTOR 10K 1 125 0 25 0698 6360 14816 0698 3440 7 RESISTOR 196 1 125W F TC 0 100 C4 1 8 10 196R F Sce introduction to this section for ordering information 7 68 Indicates factory selected value Model 4935A Reference HP Part Mfr Part Designator Number Description Number 14817 0757 0465 RESISTOR 100K 1 125W 0 100 24546 4 1 8 0 1003 A14R19 0757 0280 RESISTOR 1K 1 125W F TC 0 100 2454 1 0 1001 A14R20 0757 0442 RESISTOR 10K 1 125W 0 100 24546 1 8 T0 1002 F A14R21 0757 0442 RESISTOR 10K 1 125W 0 100 24546 Ca 1 8 T0 1002 F A14R22 0757 0442 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 14823 0757 0228 RESISTOR 9 09 1
384. REQUENCY VARIABLE TELEPHONE CIRft UT noe ee e a Oe gt gt gt TRMT TIMS RCV TIMS Figure 3 4 Level and Frequency Measurements 3 21 1000 Hz LOSS 352 The 1000 Hz loss measurement determines the point to point loss gain of a 1000 Hz test tone transmitted over a voice channel To make this measurement a 1004 Hz test frequency is transmitted at the data level At the receiving 4935A the received loss or gain is measured in dBm m The wakeup transmit frequency is actually 1004 Hz not 1000 Hz to prevent errors over certain circuits This 4 Hz offset avoids measurement errors caused by test frequencies which are submultiples of the 8 kHz T carrier sampling rate The other preset frequencies Fi F are offset for the same reason 3 24 FREQUENCY SHIFT 3 25 frequency shift measurement checks for any difference in the received frequency with reference to the transmitted frequency frequency translation as caused by carrier facilities make this measurement a test tone of known frequency is transmitted At the receiving end the received frequency is observed and compared with the transmitted frequency Any difference between transmitted and received frequencies indicates a frequency shift in the test signal This measurement is not valid when measured looped around carrier facilities since the frequency shift in one direction near end to far end may b
385. RESISTOR 10K 195 125W 0 25 0698 6360 7 64 See introduction to this section for ordering information Indicates factory selected value Model 4935 Reference Designator A13R172 A13R173 13 174 A13R175 138178 A13R179 A13R180 A13R102 A13R183 A13R184 A13R185 A13R186 138187 138201 A13R202 A13R203 A13R204 A13R205 A13R206 At3R207 138208 1 1 2 AT3TP3 A13TP4 1 5 A13TP6 A13TP7 A13TP9 A13TP10 AT3TP11 A13TP12 A13TP13 A13TP14 1 15 A13TP21 A13TP22 A13TP23 A13TP24 A13TP25 A13U1 A13U2 13123 1304 1305 1306 1307 A13U8 A13U11 A13Ut2 A13U13 A13U14 A13U15 A13U16 A13U17 A13U20 A13U21 A13U22 A13U23 A13U24 A13U25 A13U26 A13U28 A13U29 A13U30 A13U31 A13U32 A13U33 A13U34 A13U35 A13U36 A13U37 A13U38 A13U38 0698 4505 0757 0463 0757 0461 2100 3884 0698 7847 0698 6360 2100 3883 0757 0421 0757 0280 0757 0465 0757 0401 2100 3882 0698 6467 0757 0458 0757 0401 0757 0458 0757 0401 0698 4002 1810 0369 0698 6445 0811 3587 9100 3489 H251 6947 1251 6947 1251 6947 1251 6947 1251 6947 1254 6947 1854 8947 1251 6947 1251 6847 1826 0712 1826 0138 1826 0624 1826 1071 1826 0742 1826 0639 1820 1956 1820 1956 1820 1956 1820 2326 1820 1315 1826 1544 1826 0667 1826 071
386. RESISTOR 17 4 25 125W 0 100 4 1 8 0 1742 A3R106 0698 8858 3 RESISTOR 12 4K 196 125W 0 25 0690 885 A3R107 0698 8858 RESISTOR 12 4K 190 125W 0 25 0690 885 A3R108 0699 7929 2 RESISTOR 9 09 1 125W 0 50 MF4C1 8 T2 9091 B A3R109 0698 7929 RESISTOR 9 09 1 125W TC 0 50 MF4C1 8 T2 9091 B A3R110 0698 6360 RESISTOR 1 125 F 0 25 0698 6350 A3R111 0698 6467 RESISTOR 16 9K 1 125W TC 0 50 0698 6467 A3R112 0693 0566 RESISTOR 15 5K 190 125W 0 25 0699 0566 A3R113 0699 0566 RESISTOR 25 5K 1 125W TC 0 25 0699 0566 Scc introduction to this section for ordering information 7 50 Indicates factory selected valuc Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued HP Part Mfr Part Number Description Number Reference Designator 1 14 0698 6445 8 RESISTOR 6 838K 1 125W 0 25 0698 6445 A3R115 0698 8638 5 RESISTOR 3 16 190 125W TC 0 25 0698 8638 116 0757 0289 2 1 RESISTOR 13 3K 1 125W 0 100 1 8 0 1332 117 0699 0589 1 2 RESISTOR 34 334K 1 125W 0 25 0699 0589 A3R118 0699 0589 1 RESISTOR 34 334K 1 125W 0 25 0
387. REV TRMT 5041 1932 5041 1933 3 1 KEY CPA DIAL SETUP TRMT 5041 1933 5041 1934 4 2 KEY CAP HOLD SETUP TRMT REV 5041 1934 5041 1935 5 1 KEY CAP BRDG SETUP TRMT REV 5041 1935 5041 1936 6 2 KEY 135 SETUP TRMT REV 5041 1936 5041 1938 8 2 KEY 600 SETUP TRMT REV 5041 1938 5041 1939 9 2 KEY CAP 900 SETUP 1RMT REV 5041 1939 See introduction to this section for ordering information 7 46 Indicates factory selected value Model 4935A Reference Designator A3 1 2 4 A3C5 A3C6 A3C7 A3C9 A3C10 A3C11 A3C12 A3C13 3 14 A3C15 A3016 A3C17 1 19 21 A3C22 A3C23 A3C24 A3C25 A3C26 A3U27 A3C28 A3C29 1 A3C32 A3C33 A3C34 A3C35 A3C36 A3C37 A3C38 A3C39 A3C40 A3C41 A3C42 A3C43 A3C44 45 A3C46 7 A3C49 A3C50 A3C51 A3C52 A3C53 A3C54 A3C55 A3C56 A3C57 A3C59 A3C60 A3C61 A3C62 A3C63 A3C64 A3C65 A3C66 A3C67 A3C68 69 A3C70 A3C71 A3C72 A3C73 0180 3124 0180 1746 0180 1746 0180 1746 0160 0576 0160 2213 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 2225 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 0576 0160 6405 0160 0576 0160 0576 0160 0576 0140 0190 0160 0576 0160 0576 0160 6405 0180 0374 0180 0374 0160 0576 0160 0576 0160 0576 0180 0374 0180 0374 0160 0374 0160 0576 0140 0190 0160 0167 0160 0167 0
388. S X at cz d press in Pv press in TRMT 6000 MEASUREMENT LEVEL FREQUENCY d Set the Audio Analyzer to measure distortion in dB The input should be floating 4 Enable the 30 kHz low pass filter on the Audio Analyzer D Measure distortion at the following points FREQUENCY OUTPUT LEVEL DISTORTION 100 Hz a 10 dBm b 0 dBm 4000 Hz a 10 dBm b dBm see figure 4 13 for circuits 4 21 Performance Tests Model 4935A PERFORMANCE TESTS 6 Turn off the 30 kHz low pass filter on the Audio Analyzer Measure distortion at following points FREQUENCY OUTPUT LEVEL DISTORTION i 110 kHz 9 dBm bi 0 dBm c 20 dBm 8 Connect an amplifier with 20 gain in the signal path as shown Figure 4 12 Power Supply should supply 12 V to the 20 dB Amplifier and 4 kHz Low Pass Filter Board See Figure 4 1 3 for the circuit and Table 4 14 for the Parts List MODEL 4935 AUDIO ANALYZER 20 dB AMP AND 4kHr LPF Figure 4 12 40 dBm Distortion Test 9 Enable 30 kHz low pass filter on the Audio Analyzer 10 Measure distortion at the following points The 4 kHz low pass filter should not be used in the measurement FREQUENCY OUTPUT LEVEL DISTORTION al 100 Hz 40 dBm 4000 Hz 40 dBm 11 Change 20 amplifier to unity gain and switch in 4 low pass filter 0 Measure distortion at the following point FREQUE
389. SC versa 8 221 this signal is present varies with output level and the left hand display indicates approximate ly 5 0 dBm then go to the inputs from the FRONT PANEL NOTCH FILTER 25 dB AMP TONE DROPOUT SIGNAL PATH section paragraph 8 232 Figure 8 22 Transmit Monitor Test Output 4 VOLTS APPROX 60uS AT 5 dBm 8 44 Model 4935A Service 8 222 Transmit Monitor Signal 8 223 Check for a 3 9v signal at This signal should be a clean 1004 Hz sinewave If this signal is not present fix the transmitter circuit 3 224 INPUT Check a signal at JU6 approximately 3 9v 1004 Hz the signal is present go to paragraph 8 225 Check JU3 for proper latch contents pin 15 logic 0 pin 14 logic pin 13 logic 0 If not latch microprocessor or data bus problems are probable After fixing return to step 1 Check for signal at TP14 3 9v 1004 Hz signal is present A3U35 has failed Check for signal at A3U34 pin 5 If signal ts present A3U34 has failed Fix it and return to step 1 If no signal is present at A3LI34 pin 5 then the low pass filter using A3UI4 has failed Fix and return to step 1 8 225 Noise Filter Check for a signal at U48 pin 6 3 9v 1004 Hz If signal 1 present the flat filter path and MUX are working go to paragraph 8 227 If not continue to step 2 Check MUX select address A3UI I 2 logic 0 pin 10 logic pin 11 lo
390. SELECTION 2 10 Figure 2 1 provides instructions for line voltaze selection Card and fuse are factory installed for 120 Vac operation PROCEDURE Slide cover door to left the line power cord must be disconnected Rotate FUSE PULL to left Remove the fuse Remove the PC board by pulling it out Select operating voltage by positioning PC board to show the desired voltage on top left side Reinsert the PC board Operating voltage 15 Rotate FUSE PULL back into normal position shown in module window and reinsert fuse Use caution to select correct fuse value Figure 2 1 Line Voltage Selection 2 1 Installation Model 4935A 2 2 2 11 POWER CABLE Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting the protective earth terminal can make this instrumenl dangerous Intentional interruption 15 prohibited 2 12 This instrument is supplied with a three wire power cable When connected to an appropriate three wire power receptacle the cable grounds the instrument chassis 2 13 OPERATING ENVIRONMENT 2 14 TEMPERATURE The instrument may be operated in temperatures from 0 to 50 C 32 F to 122 F Temperature for battery unit operation is 0 to 40 C 32 F to 103 F 2 15 HUMIDITY The instrument may be operated in environments with humidity from 5 to 95 R H 40 C However the instrument should be protected from temperature extre
391. SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT 025 5 52 SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SG CONNECTR SGL CONT 025 5 52 SQ CONNECTR SGL CONT PIN 025 IN BSC SZ SG IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P COMPARATOR GP QUAD 14 DIP P PKG IC CONV V FREQ 14 DIP P PKG IC OP AMP IC PRECISION 10V REFERENCE AD581J IC CONV 8 B D A 160DIP P PKG IC LCH CMOS COM CLOCK QUAD IC LCH CMOS COM CLOCK QUAD IC LCH CMOS COM CLOCK QUAD IC XLTR CMOS TIL TO MOS HEX IG MULTIPLXR 8 CHAN ANLG 16 DIP P PKG IC OP AMP GP 8 DIP P PGK AMP LOW BIAS H IMPD 8 DIP P PKG IC OP AMP LOW BIAS H IMPD DUAL 8 DIP P IC LCH CMOS COM CLOCK QUAD IC OP AMP IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP GP 8 DIP P PKG IC SWITCH ANLG DUAL 16 DIP C PKG IC OP AMP GP 8 DIP P PKG IC OP AMP GP 8 DIP P PKG IC OP AMP H SLEW RATE 8 DIP P PKG IC OP AMP LOW BIAS H IMPD QUAD 14 DIP IC AMP LOW BIAS H IMPD DUAL 8 DIP IC OP AMP GP 8 DIP P PKG IC SWITCH ANLG DUAL 16 DIP C PKG IC SWITCH ANLG DUAL 16 DIP C PKG IC OP AMP LOW BIAS H IMP QUAD 14 DIP P IC MULTIP
392. SISTANCE IN OHMS CAPACITANCE IN MICROFARADS INDUCTANCE IN MICROHENRIES 3 ASTERISK INDICATES FACTORY SELECTED COMPONENT AVERAGE VALUE SHOM 4 UNLESS OTHERWISE INICATED ALL GROUNDS ARE DIGITAL GROUNDS 35A13SH2 10 88 Figure 8 3 Receiver Board Schematic Diagram Sheet 2 8 1 9V 2 ov 8 FROM U48 6 SHT2 P O P1 22 9 JU4 1 9V 3V L 13 4 o ov 10 2 eae gt 1 FROM A14 zm EE as TRANSMITTER N OF ae OW 0 55 T ey ee RM jf 122220 CIRCUIT APPLIES TO STANDARD UNITS ONLY we CIRCUIT APPLIES TO P AR UNITS ONLY NOTES 1 REFERENCE DESIGNATION WITHIN THIS ASSEMBLY ARE ABBREVIATED ADD ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTION 2 UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE N MICROFARADS INDUCTANCE IN MICROHENRIES 3 ASTERISK INDICATES FACTORY SELECTED COMPONENT AVERAGE VALUE SHOWN 4 UNLESS OTHERWISE INDICATED ALL GROUNDS ARE DIGITAL GROUNDS NL 5V 4V 116 C131 0 1 0 1 NAT 12 11 C140 e 0 1 U50A C1 C133 C99 10 10 R95 R179 6838 10K N C132 14 3160 R178 1111 Te ed F 14V 115 15V T ds C 3 7 CR26 1 6 4 R92 i 1111 C98 0 1 CR27 gt 14 14 5 ANALOG SWITHCES AR
393. Select MUX and Power Amplifier sections of the schematic Change R80 to 1 62K Change R81 to 2 43K Change R97 to 2 37K Change R98 to 1K 7 8 Model 4954A Manual Changes CHANGE 11 Page 6 5 Figure 6 2 Exploded View Assembly and Cables Change Item 13 to Insulator binding posts HP 03770 50004 Page 6 35 6 36 blank Table 6 3 Replaceable Parts Continued Change 04936 40001 to 03770 50004 INSULATOR BINDING POSTS CD 2 Mfr Code 28480 P N 03770 50004 CHANGE 12 Page 6 16 Table 6 3 Replaceable Parts Change A3U20 to 1826 0741 IC Op Amp low bias CD 4 MFG CODE 04713 MFG P N MC34002AG CHANGE 13 Page 6 16 Table 6 3 Replaceable Parts Change A3U20 to 1826 0741 IC Op Amp low bias CD 4 MFG CODE 04713 MFG P N MC34002AG Page 6 16 Table 6 3 Replaceable Parts Add A13C48 0180 0374 Capacitor fxd 10uf 10 CD 3 MFG CODE 56289 MFG P N 150DI06X9020B2 Page 6 16 Table 6 3 Replaceable Parts Add 13 10 1901 0376 Diode Gen Prp 35 50mA CD 6 MFG CODE 28480 MFG P N 1901 0376 Delete A13C203 0160 0576 Capacitor fxd 1 uF 20 CD 5 MFG CODE 28480 MFG P N 0160 0576 Delete A13C204 0160 0576 Capacitor fxd 1 uF 20 CD 5 MFG CODE 28480 MFG P N 0160 0576 Delete A13C205 0160 3824 Capacitor fxd 3900 pF CD 2 MFG CODE 05176 MFG P N HEW 249 Delete A13CR28 0190 0050 Diodc switching 80V 200MA 2ns CD 3 MFG CODE 02237 MFR P N FDH 6308 Delete A13CR29 0190 0050 Diode switching 80V 200MA 2
394. TONE TO A4 A14 TRANSMITTER ASSY 1 REFERENCE DESIGNATION WITHIN THIS ASSEMBLY ARE ABBREVIATED ADD d ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTION 2 UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE iN MICROFARADS INDUCTANCE IN MICROHENRIES 3 ASTERISK INDICATES FACTORY SELECTED COMPONENT VALUE SHOWN UNLESS OTHERWISE INICATED ALL GROUNDS ARE DIGITAL GROUNDS 35A13SH1 10 88 E Figure 8 30 Receiver Board Schematic Diagram Sheet 1 of 4 8 7 P O A3 A13 RECEIVER BOARD ASSY 04935 uy Wu Vete ee es Esa R79 232K C66 C67 1700PF 1700PF R81 R80 1 134K 365K 2 V MESSAGE FILTER L e S FROM U52 6 SHT 1 r 4 T JKHZ FLAT FILTER C108 14V 2400 R104 31 25K 31 25 15 4 1200PF l ee ee ee 14V 120 0 01 R140 4120 R138 287K C122 Y w lt m 04935 60031 REV A SERIES 2822 38 3 ew O O sOs 70 RIC C68 1700PF 4700PF 25 R81 R11 1700PF 89 25 5 0 1 12 V 11 N N 14 7 seeds Fg 15
395. TOR FXD 15UF 10 20VDC CAPACITOR FXD 47UF 10 35VDC CAPACITOR FXD 1UF 20 SOVDC CER CAPACITOR FXD 1UF 20 5OVDC CER CAPACITOR FXD 1UF 20 CER CAPACITOR F XD 1UF 20 CER CAPACITOR FXD 1UF 2096 50VDC CER DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE PWR RECT 50V 5A 200NS DIODE ZNR 5 11V 5 00 35 PD 4W DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE ZNR 10V 5 00 15 1W TC 0696 DIODE ZNR 16 2V 5 00 35 PD 4W DIODE ZNR 16 2V 5 DO 35 PD 4W DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE PWR RECT 50V 5A 200NS DIOOE PWR RECT 50V 5A 200NS FUSE 4A 125V 281X 093 FUSE 4A 125V 281X 093 FUSE 4A 125V 281X 093 CONNECTOR 2 M POST CONNECTOR 2 PIN M POST TYPE CONNECTOR 3 PIN M POST TYPE RELAY 4C 24VDC COIL 2A 115VAC TRANSISTOR PNP 2N6476 SI TO 220AB TRANSISTOR NPN S PD 625MW 50
396. TRMT f 101 D to 4 DC current reading of 24 0mA mA 011 the 4935A press in the REV button Adjust A2R73 RCV 1 IOLD lo DC current reading of 24 0mA 1 mA Reverse the power supply leads The DC current readings should be 24 0mA in both the TRMT and HOLD circuit Return the power supply leads to the normal polarity Set the monitoring Voltmeter to a voltage range of 50V greater and adjust he Power Supply for 30V DC The DC current reading should bc less than 26mA Press in the NOR button The current should be less than 26mA 5 0 5 1 0 BLANK Model 4935A Replaceable Parts SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for ordering replacement parts Table 6 lists abbreviations Table 6 2 is the Manufacturer s Code List and Table 6 3 lists replaceable parts Figures 6 1 6 2 and 6 3 are exploded views of the instrument 6 3 REPLACEABLE PARTS LIST 6 4 Table 6 3 1s the list of replaceable parts with parts listed in alphanumerical order Included is the description quantity total used in the instrument HP Part Number and manufacturers part number Chassis and mechanical parts are also listed in Table 6 3 and Figures 6 1 6 2 and 6 3 6 5 ORDERING INFORMATION 6 6 To order a listed part quote the HP Part Number indicate the quantity needed and address the order to the nearest Hewlett Packard Office When ordering a non listed part include the instr
397. U49C 45V Kien see 8 NC U49E U49F 11 t 10 9 8 NC 13 12 NC U49B 7 1 1490 ST P y e n r ooo axo v pn M R68 8250 RBO 1 62K R67 14V 14 0 1 11 0 Wy 0 4 cae R70 R69 6 c45 50 909 681 5 a R71 C43 10K 1200P C44 14 W 1200P Ep nh oa WIDEBAND LOW PASS FILTER SINE TRANSMIT 2K R97 2 57 825 72 R65 G LooP ADU 500 LOOP ADJUST AMP Service P O J3 38 m R35 OUTPUT LEVEL a te S S eee ay 222 c ML 7 POWER AMPLIFIER 14V 883 R76 585 10K R81 dm X C53 UN 0 1 28 0 2 Ww SWITCH ASSY R79 7 31 6 CR29 15V gt IW CR30 cat m CR27 oy Iw R75 10K NOTES 1 REFERENCE DESIGNATIONS WITHIN THIS ASSEMBLY ARE ABBREVIATED ADD ASSEMBLY NUMBER TO ABBREVIATION C72 FOR COMPLETE DESCRIPTION 0 15 2 UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE IN MICROFARADS INDUCTANCE IN HENRIES 3 ASTERISK INDICATES FACTORY SELECTED COMPONENT AVERAGE VALUE SHOWN 4 UNLESS OTHERWISE INDICATED ALL GROUNDS ARE DIGITAL GROUNDS NC ANALOG OUTPUT TO 9 XMIT TO A
398. USE 4A 125V 281X 093 FUSE 4A 125V 281X 093 216004 276004 276004 ASF 1 A5F2 ASF 3 1251 4245 1251 4245 1251 4246 CONNECTOR 2 PIN M POST TYPE CONNECTOR 2 PIN M POST TYPE CONNECTOR 3 M POST TYPE 1251 4245 1251 4245 1251 4246 A5J2 A5J3 A5J4 0490 1570 RELAY 4 24VDC COIL 2A 115VAC 2470 0369 1853 0406 TRANSISTOR PNP 2N6476 SI TO 220AB 2N6476 1854 0575 TRANSISTOR NPN SI PD 625MW FT 50MHZ MPS A42 1853 0036 TRANSISTOR PNP SI PD 310MW FT 250MHZ 1853 0036 1854 0215 TRANSISTOR NPN S PO 350MW 300 2 2N3904 1853 0036 TRANSISTOR PD 310MW 250 2 1853 0036 1853 0036 TRANSISTOR PNP SI PD 310MW FT 250MHZ 1853 0036 1853 0036 TRANSISTOR SI PD 310MW FT 250MHZ 1853 0036 1854 0215 TRANSISTOR NPN SI PD 350MW FT 300MHZ 2N3904 1854 0215 TRANSISTOR NPN SI PD 350MW 300 2 2N3904 1854 0215 TRANSISTOR NPN St PD 350MW 300 2 2143904 1854 0727 1853 0036 1853 0406 TRANSISTOR NPN 23647 SI TO 220AB TRANSISTOR PNP SI PD 310MW FT 250MHZ TRANSISTOR PNP 2N6476 SI TO 220AB 2N6474 1853 0036 246476 0757 0418 RESISTOR 619 1 125W TC 0 100 0757 0465 RESISTOR 100K 1 125W F 0 100 0757 0458 RESISTOR 51 1K 1 125W 0 100 0757 0442 RESISTOR 10K 1 125W F 0 100 0757 0280 RESISTOR 1 125W 0 100 0757 0442 RESISTOR 10K 1 125W F 0 100 C4 1 8 TO 1002 F 0
399. V These provide typically 2 5 hours of continuous use without recharging To recharge the battery packs connect the HP 4935A to an AC power source and press the power switch to STBY Normal recharge time is about 17 hours 1 28 The batteries may be charged at temperatures between 5 C and 40 C 41 F and 104 F but have greater charge capacity if charged between 5 and 25 C 41 F and 77 F At temperatures above 25 C the charge acceptance falls off as shown in Figure 2 For example cell charged at 45 C accepts about 60 70 of its rated capacity Temperatures below 5 C cause pressure to build up within the cell as it is charged which could result in venting of the cell This results in a permanent degradation of the battery capacity due to loss of electrolyte 1 29 Operating Temperature 1 30 Normal operating temperature of the 4935 with batteries options 001 and 003 should be between 20 C and 409 However there will be a loss of capacity when operating at the extremes At low temperatures the batteries cannot fully discharge even if they were fully charged at room temperature At high temperatures this same effect take place to a lesser degree in addition to the problem of charge acceptance previously mentioned 100 EFFICIENCY P d 7 80 LINE 60 40 20 oc lt L LL LLI lt Y 4 40 60 120 160 200 CHARGE INPUT OF NOMINAL CAPACITY CHARGE RATE
400. V KEY to display the received signal RCV light will be on Press MEAS key to select NOISE TO GROUND C Use FILTER key to select the desired filter d Read dBrn noise level in the left display Figure 3 2 Measurements Continued 3 14 Model 4935A Operation KA 4935A TRANSMISSION TEST OUTPUT P de PACKARD C THRESH Llonts LEVEL aw dBm D kHz 9 1 Hz A od Sua rn A A A A A v3 Ta STEP MEASUREMENT FILTER IMPULSE NOISE a y dE C FREQUENCY 1 C MESSAG 15 MIN SET NOISE 3 KHz FLAT 15 MIN O MID Ku EINE 15 KHz FLAT C 60 MIN HIGH NOISE C PROGRAM STOP L JTIMER CIE C 50 KBIT MONITOR PERIOD F DISPLAY F2 VOLUME C P AR 1004 MEAS RESET STOP 2713 P AR TRANSMITTER Option 002 and 003 a Press DISPLAY TRMT RCV key to display the transmitted signal TRMT light will be b Press MEAS key to select P AR C Use OUTPUT LEVEL knob to adjust signal level to data level Maximum output for P AR is 3 dBm P AR RECEIVER Option 002 and 003 a Press DISPLAY TRMT RCV key to display the received signal RCV light will be on b Press MEAS key to select P AR Read units in right display Figure 3 2 Measurements Continued 3 15 Operation TRM T RCV RCV TR Model 4935A 4935A TRANSMISSION T
401. WITCHING 80V 200MA 2NS DO 35 1901 0050 R14 1901 0050 2 DIODE SWITCHING 80V 200 2NS DO 35 1901 0050 A3CR15 1901 0518 DIODE SCHOTTKY 5082 5509 A3CR16 1901 0518 2 DIODE SCHOTTKY 5082 5509 26 1901 0050 DIODE SWITCHING 80V 200 235 00 35 1901 0050 A3CR27 1901 0050 3 DIODE SWITCHING gov 200MA 2NS W 35 1901 0050 1 A3J1 1250 0257 9 CONNECTR RF SMB M 50 1250 0257 4 1251 5063 CONNECTR 6 POST 1251 5063 1251 6947 0 CONNECTR SGL CONT PIN 025 IN BSC SZ SQ 1251 6947 A3JU1 1200 0607 a SOCKET IC 16 CONT DIP DIP SLDR 1200 0607 A3JU2 1251 4398 SHUNT 4 POSITION 1251 4388 A3JU3 1200 0607 8 SOCKET IC 16 DIP DIP SLDR 1200 0607 1200 0607 8 SOCKET IC 16 DIP DIP SLDR 1200 0607 1200 0607 8 16 DIP SLDR 1200 0607 A3JU5 1200 0607 8 SOCKET IC NT DIP SLDR 1200 0607 AU 1258 0141 5 JUMPER SEVA ae FOR 025 IN BSC SZ SQ 1258 0141 7 1258 0141 5 JUMPER REMOVABLE FOR 025 IN BSC SZ SQ 1258 0141 A3R1 0757 0442 9 RESISTOR 10K 1 125W TC 0 100 C4 1 8 TO 1002 F A3R2 0757 0442 8 RESISTOR 10K 1 125W TC 0 100 C4 1 8 TO 1002 F A3R3 0698 4465 5 RESISTOR931 1 125W TC 0 100 C4 1 8 TO 831R F A3R4 0698 6393 rene 0698 6393 3 RESISTOR 585 1 125W TC 0 25 4 1 8 0 1001 A3R7 0757 0290 5 RESISTOR 6 19K 1 125W TC 0 100 MF4C1 8 TO 6191 F 5 A3 0757 0290 5 6 19K 196 125W y 04 100 MF4C1 8 T0 6191 F A3R9 0898 0084 9 RES
402. XD 1 UF 20 CER 28480 CAPACITOR FXD 10UF 0 20 0 CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 10UF 10 20VDC TA CAPACITOR FXD 10UF 10 20VDC TA CAPACITOR FXD 60OPF 1 300VDC MICA CAPACITOR FXD 1200PF 196 1900VDC MICA on Meer A 1UF 20 50V CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 3 UF 20 CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD CAPM 5001700PF 100VIZOOVDC MICA CAPACITOR FXD 10UF 10 20VDC CAPACITOR FXD 1100PF 196 MICA CAPACITOR FXD 1700PF 01 MICA CAPACITOR FXD 1UF 20 CER CAPACITOR FXD 1UF 20 50VDC CER CAPACITOR FXD 2 2UF 10 20VCC CAPACITOR FXD 2 2UF 10 20VDC TA CAPACITOR FXD 1700PF 196 100VDC MICA CAPACITOR FXD 1700PF 1 1 OOVDC MICA CAPACITOR FXD 1700PF 1 IWVDC MICA CAPACITOR FXD 1000 1 500VDC MICA GAPACITOR F XD 4700PF 1 300VDC MICA CAPACITOR FXD 1000PF 1 MIC See introduction to this section for ordering information Indicates factory selected value Model 4935A fr Part umber 04935 60032 0160 3124 150D156X9020B2 150D156X9020B2 150D156X9020B2 0160 6623 0160 5719 0160 6623 0160 6623 0160 6623 0160 6623 0160 6823 0160 6573 0160 6623 0160 6623 0160 6623 0160 6623 0160 6623 0160 6623 HP204571PF3C1 0160 6623 0160 6623 0160 6623 DM15E39J0300WV1CR 0160 6623 0
403. a a a a a a a a a a uu 752 2382 d 39 mea Y 20 P O TIP 13 RCEIVER ASSY CABLE INPUT TRANSFORMER J4 c 135 600 RING 6 ORANGE P O 46 47 TO A1 FRONT PANEL ASSY PUSH BUTTON B ACTUAL 2 ee 600 omms 0 900 OHMS INE 900 OHMS EJ 155 OHMS 758 OHMS TO A4 A14 TRANSMITTER ASSY OUTPUT TRANSFORMER P O 46 7 K3 5 6 7 B P O J6 J7 9 1 10 FRONT PANEL 11 ASSY K4 12 NC GND 2 NC 1 35A2SH1 10 88 Figure 8 26 A2 Switchboard Schematic Diagram Sheet 1 of 2 8 71 FROM A14 TRANSMITTER ASSY 8 32 FROM A3 A13 RECEIVER ASSY P O A2 DISPLAY ASSY 04 P O P1 MODE CONTROL 9 MODE C ois 8 write gt lla DS 103 12 104 100 j s C u smk 052 053 054 101 102 03 ee LEFT HAND DIGITS J6 051 J7 26 EXC 5 E T E 22 NM PEE 4 E 18 EE 16 p 15 14 13 _FRONT PANEL 058 RD4 RIGHT HAND DIG
404. adjustable volume for listening to the circuit under test or to the Test Set Transmitter Figure 3 1 Front and Rear Panel Controls Connectors ndicators Continued 3 5 Operation Model 4935A 3 7 OPERATING INSTRUCTIONS 3 8 Figure 3 9 lists the various measurement modes available A brief Power On and Set Up procedure precedes detailed explanation Each measurement mode is explained with a drawing and accompanving text POWER ON and SET UP A C POWER Connect power cord to rear line module on which correct line voltage has been selected See paragraph 2 9 of Installation section for procedure to select line voltages WARNING Always connect power cord to a properly grounded 3 wire power outlet 2 Press POWER button ON The 4935A will automatically do a self check of the transmitter the filters and the LEDs Be CHAE OE II O PS p AT ro For operator protection during battery operation connect the chassis terminal on the rear panel to earth ground BATTERY POWER Optional 1 Press POWER button ON with no power cord connected When switching between battery and A C power cycle the POWER button from STBY to ON again NOTE Proper care in charging and discharging NiCad batteries can dramatically improve their lives Consult Section I of this manual for recommended procedures SET UP Connect circuit to 310 jacks Do not connect more than 200VDC
405. ae 1 JUS 4 NC NC 1311211 10 amp P O R20 se NC NC NC V R12 18 iTIK 7 AL NOTE 3 ANALOG SWITCHES ARE ORAWN AS THEY WOULD BE WITH LOGIC ON THE CONTROL INPUT 54 106K 01 q iQOK 1010 Whar Ri32 NOTCH 2 5000 140 168K RIST 16 T6aK RISI R186 13 758 2 R44 15 R45 5 8k 4148 7 741 FZ 1025 4 4 Se A ED RN 2 1413 RECEIVER BD WITH P AR 04935 80006 SERIES 2115 M mmm 4 qa F y 14 33 ea ee eee ee kus pss ET 5155 R78 482 44 242K 113K 182 RIS Uia 258 A C66 55 Toopr 7 4 rdi i4V ME usns CTS 0 1 x 12 T mE E x 1 3 LE a 4 6 N _ 2 gt q _____ _ _ _ ___ _ _ _ _ _ ji 673 47 cai NOTE 5 R103 2108 2400PF ANALOG SWITCHES ARE IT eK 17 3 RIOT U36 ORAWN AS THEY WOULD 5 BE WITH
406. al the problem is on the switch board input and impedance selection sections If no signal appears at TP11 the input transformer and associated eircuitry including noise to ground circuitry is suspect Replace the cable 8 237 Noise To Ground input Path Noise To Ground Units Only 8 238 Remove the receiver input cablc W3 Jumper pins 3 and 6 together and feed input signal to pin 3 vs ground pin is ground pin 2 is missing Monitor TPI3 with an oscilloscopc check U27 signal Close the DIP switch between JU3 pins and 16 The signal should appear at TP13 if not check U30 and U27 NOTE If U27 ts not installed W2 must be installed Replace recciver input cablc W3 Open the DIP switch between pins 1 16 of JUJ 8 48 Model 4935A Service 8 239 Tone Dropout Signal Path 8 240 Adjust input signal to 2004 Hz approximately 5dBm TP13 approx 3 9v The signal at TPI2 should be about 42v P P Check the signal at A3UIS pin 6 it should be approximately 12 6 2004 Hz 31 times whatever signal is at TP12 the 12 6 assumes 4v at TP12y if not check A3UI5 and associated eircuitry 8 241 Change input signal to 1004 Hz Voltage at TP12 should be approximately 7 8v 1 not check U 16 bandpass filter The signal at both sides of C159 should be rouglily 1004 Hz squarewave 23v P if not check 1115 8 242 Notch Filter 8 243 At TPI4 the input signal of 1004 Hz is approximately 54 Close t
407. amp SERVICE MANUAL 04935 90023 INSULATOR XSTR THRM CNDCT 0340 0949 1 2 JGK 125 IN ID 0370 1089 KNOB BASE 1 2 JGK 25 IN ID 0370 1091 SPACER SNAP IN 0403 0294 TAPE INDUSTRIAL 25 0460 0880 TAPE INDUSTRIAL FOAM 0460 1601 NUT HEX 4 40 0590 0076 JUMPER REM OPT 001 amp 003 CLAMP CABLE OPT 001 amp 003 BATTERY HOLDER ERY 56 Y 15 6V 6 BINDING POST SGL SGL TUR JGK CARRYING CASE FUSE 5A 250V 120 VAC OPERATION FUSE 25A 250V 220 VAC OPERATION SCREW MACH 4 40 375 IN LNG 1258 0141 1400 0510 1400 1076 ONY 1420 0284 1420 0284 1420 0285 1510 0076 1540 0835 2110 0012 2110 0004 ORDR BY DSCRPTN SCREW MACHINE 4 40 ORDR BY DSCRPTN NUT HEX W LKWR 4 40 094 ORDR BY DSCRPTN SCREW MACH 6 32 375 IN LNG ORDR BY DSCRPTN SCREW MACHINE 6 32 ORDR BY DSCRPTN NUT HEX W LCK WSHR ORDR BY DSCRPTN SCREW MACH 8 32 375 IN LNG ORDR BY DSCRPTN SCREW MACH 8 32 4 IN LNG ORDR BY DSCRPTN NUT HEX 3 8 32 2950 0043 NUT HEX DBL CHAM 3 8 32 WASHER FL MTLC NO 8 ORDR BY DSCRPTN 3050 0001 N ARAN WASHER FL MTLC 5 16 375 3050 0067 WASHER FL MTLC NO 6 3050 0100 NYLON WASHER 3050 1114 4 SPACER SHORT PLASTIC 5040 4
408. anged The adders add the phase step size the binary frequency value to the old phase address to get a new phase address The new phase address 18 latched into the phase address latch on the positive going transition of the clock line The output of the phase address generator 15 a series of ROM addresses 8 118 ROM AND LATCHES and latches convert the series of addresses from the phase address generator and into a series of binary voltage values which represent the output waveform These values are held in the voltage value latches This section unpacks the 8 most significant bits and the 2 least significant bits of voltage data so that the D to converter can get the entire 10 bits at one time 8 119 DIGITAL TO ANALOG CONVERSION The digital to analog conversion circuit takes the binary voltages from the voltage value latches and converts them to a series of step voltages approximating the output waveform Both the D to A converter and current to voltage converter are in this circuit The current to voltage converter converts the output of the D to A converter to a series of voltage not current values 8 120 FILTER AND SIGNAL SELECT The output of the digital to analog conversion circuit is an approximation of the desired output Unwanted high frequency components introduced by the step nature of the waveform must be filtered The P AR waveform is filtered by the 5 kHz low pass filter The output select multiplexer selects the approp
409. arts Add AS3R59 0698 3156 Resistor 14 7K 1 125 W CD 2 MFG CODE 24546 P N C4 1 8 TO 1472 F Replace A3R62 with 0698 3223 Resistor 1 24K 1 125 CD 4 MFG CODE 24546 MFG P N C4 1 8 TO 1241 F Replace A3R63 with 0698 3223 Resistor 1 24K 1 125 W CD 4 MFG CODE 24546 MFG P N C4 1 8 TO 1241 F Replace A3R73 with 0757 0431 Resistor 2 43K 1 125 W CD 6 MFG CODE 24546 MFG P N 4 1 8 2431 Replace A3R74 with 0698 3223 Resistor 1 24K 1 1925 W MFG CODE 24546 MFG P N 4 1 8 2431 Page 6 15 Table 6 3 Replaceable Parts Delete 208 5020 5252 Wire 1 2 CD 3 MFG CODE 28480 MFG P N 5020 5252 Page 6 23 Table 6 3 Replaceable Parts Replace with 04935 60008 Rear Panel Assembly CD 8 MFG CODE 28480 MFG P N 04935 60008 Replace A6T1 with 9100 2676 Transformer AC pwr CD 3 MFG CODE 28480 MFG P N 9100 2676 Add 7100 0389 Transformer Cover 62 DP CD 9 MFG CODE 28480 MFG P N 7100 0389 Page 6 26 Table 6 3 Replaceable Parts Delete A13C202 Hand Selected Capacitor Replace A13CR8 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Replace A13CR9 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Replace A13CR10 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Replace A13CR12 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Replace A13CR15 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Repla
410. at the rear power input module is set to the line voltage im use and that the correct fuse is installed P10 Whenever internal circuits are exposed caution must be used Observe all warnings and cautions marked on the instrument or listed in the procedures When using AC power for test equipment the chassis must be connected to earth ground When the power bution ison STBY standby AC and DC voltages are present in the instrument completely power down disconnect the AC power cord from the 4935A The batteries in options 001 and 003 provide continuous power to 4935A circuits follow the disassembly procedures in Section Service to access the instrument WARNING Power switeh does not turn off AC power and some DC circuits 1 12 RELATED MANUALS 15 Operating information is summarized on card in the instrument cover 1 14 USER REPAIR I1 5 1 nternal repairs to the instrument should be done by authorized repair shops only For assistance contact the nearest t lewlett Packard Sales and Service Office listed at the rear of this manual 1 16 OPTIONS AND ACCESSORIES 1 17 Options available are Option 001 Adds a rechargeable battery pack Opt ton 002 Adds P AR Peak Average Ratio measurement in place of Noise to Ground Option 003 Adds P AR Peak Average Ratio measurement in place of Noise to Ground and a rechargeable battery pack Option 917 Adds a South Africa Power Cord 1 18 Aecessories availab
411. ate U20 When hex is written into the keys a key closure causes an interrupt via external interrupt of the microprocessor A 50 millisecond one shot and a D type flip flop form the switch debounce circuitry Bit 2 of I O Port 5 is programmed by the microprocessor to reset the interrupt latch after the key has been read 8 54 Receiver Impedance Switches 8 55 The receiver impedance selected the front panel setup switches is sensed through the option and miscellaneous sense latch The microprocessor uses the receiver impedance to compute the power level of the input signal 8 56 When the 4935A is in BRG receive impedance mode the receiver has a high impedance input However the received level is still computed from the input voltage per the receive impedance selected on the setup switches For correct level measurement the proper receive impedance MUST BE SELECTED Model 4935A 8 57 MICROPROCESSOR TO OPERATOR 8 58 Displays 8 59 The microprocessor sends information to the operator through the front panel numeric displays and annunciators The displays and annunciators are driven by two display decoder drivers on theswitch board which provide all multiplexing and drive requirements The display or the annunciator decoder drivers are selected by the chip enable decoder outputs DISP or ANNUN AO of I O port 4 If control or data is input to the display chips through the system data bus from I O port 1 of the
412. ations The 10 most significant bits of the address counter are used for the ROM ROMs generally have 8 bit words available The 4935A needs 10 bits of binary voltage value to keep waveform distortion to an acceptable level The8 most significant bits ofthe voltage value are saved in the first 1024 placesin the ROM and the 2 least significant bits ignoring extra bits in the next 1024 locations in the ROM The ROM is accessed twice for each voltage value The 2 least significant bits are saved in an intermediate latch until the 8 most significant bits are available and the whole 10 bit number can be latched and presented together to the digital to analog conversion circuit which changes the binary number to a voltage value 8 111 Thellth address bit is used to select whether the 8 most significant or 2 least significant bits are accessed The 11th ROM address bit is driven by the transmit clock When the clock is high the 2 least significant bits are accessed and latched into the intermediate latch on the falling edge of the clock When the clock goes low the 8 MSB s are accessed and latched on rising clock edge into the final latch where they are presented to the D to A converter The D to A converter output is the stepped approximation of the desired wave in current form The output of the current to voltage converter changes the current waveform to a voltage waveform 8 112 The 4935A ROM contains 2 full waveforms 1024 ten bit points of sinewave
413. blank Model 4935 Manual Changes A 13133 501 TPS ri HE LO DET Ali 24915 60008 1 5 C 2208 vo Jf 5 13 1 2 12 hie gates 2 ed TP2 7 14 uoi 14 P ua B Dos 5 e C1 a us TL D Als rs 9 Gu ON DPPOGII SIDE i09 875654521 C jc d dns eee eco 06 R T 26 _ le gt me UE C156 ir Ve a SZ 2 w X 2 15 2 18 2 15 2 Is 2 15 i z E FFSET 1 x 14 3 14003 i 14 3 140 P Ry nas A 4 13 13 5 13 NEM Gis 12 s 2 a 5 st 2 he 5 3 2 ud s C 6 T 6 11 6 Il 6 fh amp 201 sl i 5 PETS T 7 ie 7 10 5 1 N 8 9 Z 2 i s x 3 8 7 D 3 T oN L iaia s 2 24 25 Mec hate 21 74 ome Tt 2 NI c e 5 r 2 2 R 2 C Mh P 3 ee n 5 22 623 x 2 6 C 16 3 2 u R 15 A 5 E H A 2 2 u d 22 X 4 UN 4 fal s 16 l 52 2 2 uPPOSTQTE S DE 5 46 si 5 13 2 1 7 P
414. cates factory value Model 4935A Number Reference Designator 14052 1826 0735 A14U53 1826 0735 Al4XU6 1200 0654 14 032 1200 0638 14 1 0410 1180 0410 1220 0410 0800 1472 A14Y3 1200 0666 1251 6856 Table 6 3 Replaceable Parts Continued D Qty Description 1 3 IC OP AMP H SLEW RATE 1 3 IC OP AMP H St EW RATE 6 1 40 5 1 SOCKET IC 14 PIN 0 1 CRYSTAL 4 000 MHZ 9 1 CRYSTAL 4 194304 MHZ 9 1 CRYSTAL 6 144 MHZ 14 MISCELLANEOUS PARTS 9 3 TRANSISTOR SOCKET 3 CONT 0 1 CONNECTOR 18 PIN M POST TYPE Manual Changes Mfr Part Number HA3 2507 5 HA3 2507 5 1200 0654 1200 0638 0410 1180 0410 1220 0410 0800 1200 0666 1251 6856 See introduction to this section for ordering information Indicates factory selected value 7 71 Manual Changes Table 6 3 Replaceable Parts Continued HP Part C Number D Reference Designator 2110 0012 2110 0004 8120 3126 04935 60019 04935 60009 0340 0949 0370 1089 0370 1091 0403 0294 5041 6750 1258 0141 1400 0510 1510 0076 2000 0521 2200 0143 Cc gt 2260 0012 2360 0370 2360 0117 2420 0023 2510 0103 Bw 2520 0014 2950 0087 3050 0001 3050 0067 3050 0100 0590 0076 5040 4475 5040
415. ce AI3CR16 with 1901 0376 Diode Gen prp CD 6 MFG CODE 28480 MFG P N 1901 0376 Page 6 27 Table 6 3 Replaceable Parts Replace A13R50 with 0757 0159 Resistor IK 1 5 W CD 5 MFG CODE 28480 MFG P N 0757 0159 Replace A13R51 with 0757 0280 Resistor 1 125 W CD 3 MFG CODE 24546 MFG P N 4 1 8 1001 Page 6 14 Table 6 3 Replaceable Parts Add 13 59 0698 3156 Resistor 14 7K 1 125 CD 2 MFG CODE 24546 MFG P N C4 1 8 TO 1472 F Replace A13R62 with 0698 3223 Resistor 1 24K 1 125 W CD 4 MFG CODE 24546 MFG P N C4 1 8 TO 1241 F Replace A13R63 with 0698 3223 Resistor 1 24K 1 125 W CD 4 MFG CODE 24546 MFG P N C4 1 8 TO 1241 F Replace A13R73 with 0757 0431 Resistor 2 43 1 125 W CD 6 MFG CODE 24546 MFG P N C4 1 8 TO 2431 F Replace A13R74 with 0698 3223 Resistor 1 24K 1 125 W CD 6 MFG CODE 24546 MFG P N C4 1 8 TO 2431 F Page 6 29 Table 6 3 Replaceable Parts Delete A13R208 5020 5252 Wire 1 2 in CD 3 MFG CODE 28480 MFG P N 5020 5252 Page 6 34 Table 6 3 Replaceable Parts Replace 14017 with 1826 0686 IC Gate CMOS NAND quad CD 0 MFG CODE 04713 MFG P N MC14011BCL 7 6 Model 4935A Manual Changes CHANGE 7 Cont d Page 8 69 Figure 8 28 13 Receiver Board Component Locator Delete C202 R208 and add R59 as shown in Figure 7 13 Page 8 68 Figure 8 27 A3 Receiver Board Component Locator Delete C202 R208 and add R59 as shown in Figure 7 14 Page 8 69 Figure 8 29 A13 Receiver
416. ce P Part esignator umber Description IC OP AMP WB QUAD 14 DIP P PKG MC34084P IC OP AMP GP 8 DIP P PKG 1826 1544 IC SWITCH ANLG DUAL 16 DIP C PKG IH5043CDE IC OP AMP LOW BIAS H IMPD SC77968L1 IC OP AMP GP 8 DIP PKG 1826 1544 IC OP AMP LOW BIAS H IMP QUAD 14 DIP P LF347BN OP AMP LOW BIAS H IMP QUAL 8 DIP P LF353N IC OP AMP H SLEW RATE 8 DIP P PKG HA3 2507 5 IC OP AMP LOW BIAS H IMPD 8 DIP P PKG LF351N IC OP AMP LOW BIAS H IMP 1828 1189 13047 1826 1422 A13U48 1826 1544 A13U50 1826 0740 A13U51 1826 0753 A13U52 1826 1544 A13U53 1826 0665 13054 1826 0712 13055 1826 0735 A13U56 1826 0667 A13U57 1826 1189 O SOCKET IC 16 CONT DIP DIP SLDR 1200 0607 SOCKET IC 16 CONT DIP DIP SLDR 1200 0607 SOCKET IC 18 CONT DIP DIP SLDR 1200 0607 A13UX7 1200 0607 A13UX8 1200 0607 A13UX17 1200 0607 13 MISCELLANEOUS PARTS NUT HEX DBL CHAM 4 40 THD 062 IN THK ORDR BY DSCRPTN NUT HEX W LKWR 4 40 THD 094 IN THK ORDR BY WIRE 24AWG W 3008 PVC 7X32 80C 8150 0456 SNAP IN SPACER TCBS 4N 2280 0002 0590 0076 8150 0456 0380 1157 See introduction to this section for ordering information Indicates factory selected value 6 32 4935 eference signator 14 14 1 A14C2 14 3 14 4 14 5 14 14 7 14 8 14 9 14 10 14 11 14 12 A14C13 14 14 14 15 A14C16 A14C17 A14C20 A14C21 14 22 14 23 14 24
417. ch threshold Count Rate Sper sec Noise to Ground Range 6008 and 900 50 to 130 dBrn Resolution 1 dB x dere Ud E a hut acd t1 5dB Optional P AR Range to 120 P AR units Resol tlon sees vee eae ieee aes 1 P AR unit Accuracy from 30 to 110 P AR units 2 P AR units Level Range dps saris ass ao Rd 40 to 3 dBm RE ee a bw ue ae 1 dB Temperature Range Operating 0 to 50 32 F to 122 F with batteries 0 to 40 C 32 F to 10496 Storage 209 to 75 C 4 F to 1679 F with batteries 20 C to 45 C 4 F to 113 Warm up time 20 C for stated accuracy min Dimensions 11 2 x 25 9 x 28 6 cm 4 4 x 10 2 x 11 25 in Weight 5 0 kg 11 Ibs 6 5 kg 14 Ibs with battery OPTIONS DOT 5 Adds rechargeable battery pack 002 Adds P AR measurement in place of Norse to Ground 009252 pun EE Adds both battery pack and P AR Deletes Noise to Ground ACCESSORIES 15519 e de Ret Test cord w 31 0 male at both ends TRTMA Xt i EA 19 rack mount adapter 18134A u Soft pack carrying case 18161 A NS Ladder bracket 1 3 General Information Model 4935A 1 9 SAFETY CONSIDERATIONS CAUTION Before applying power make sure th
418. circuits and assemblies are accessed by removing case top The case top is secured by four screws located on the bottom of the instrument For the complete procedure refer to the Mechanical Disassembly Procedure in Section VIII Service Section CAUTION When the 4935A is in STBY AC power is still present in the instrument as well as some DC voltages Disconnect AC power from the instrument before opening the case or removing any assemblies 5 9 ADJUSTMENT LOCATIONS 5 10 Adjustment locations are shown on the component locaters at the end of Section VIII 5 1 Adjustment C alibration Model 4935A 5 11 ADJUSTMENTS Adjustments should be done in the given Power Supply adjustments should be done prior to making any internal adjustments Access instrument circuits as described in paragraph 5 7 There are six adjustment procedures the 4935 Power Supply Adjustments b Output Level and Transmit Monitor Loop Adjustments Receiver Ad justments d Notch Filler Adjustments 13 P AR Filler and Latch Adjustments Hold Circuit Adjustments Model 4935A Adjustment Calibration ADJUSTMENTS 5 13 5 V 14 V and 14 Power Supply Adjustments REFERENCE A4 Transmitter Assembly EQUIPMENT DE Voltmetr e 3490A Oscilloscope 1740 PROCEDURE Press power button ON
419. cuit under test or erroneous measurements will be obtained 3 16 The receive input may he internally terminated or bridged across the circuit under test 4935A internal termination provides a resistive load which matches the impedance of the line under test If the line is terminated externally the internal termination is switched out of the circuit by pressing in the BRG button The bridged mode provides a high impedance receive input greater than 50 kohms RANSMIT RECEIVE JACKS TRMT IMPEDANCE SELECT FROM TRMT RCV INPUT XFMR HOLD b RCV NOISE TO GND RCV IMPEDANCE RCV IMPEDANCE SELECT Figure 3 3 Input Output Switching Operation Model 4935A 3 18 dT 4935A input and output circuits are balanced to match standard voice channel lines balanced line is electrically symmetrical the two sides of the line have equal series resistance series inductance shunt capacitance and leakage to ground 3 18 To allow dialing talking and listening the circuit under test the lineman may plug his handset into the handset terminals binding posts 3 19 LEVEL AND FREQUENCY MEASUREMENTS 1 20 LEVEL FREQUENCY measurement identifies the amplitude versus frequency response of a voice channel 1000 f Is loss frequency shifts and attenuation distortion The setup as shown in Figure 3 4 is used for all of these functions m VARIABLE F
420. d d S3NI1 3SN3S 3 1 gt ke ne a l m x 59 10 243 322 242 550 NOILISOa WMON 45 8 25 S3HOLIMS 3 5 1170 3410 LM o DC Leus A 9 a pH 9E 009 C338 5 Q 2 38 934 f r3 uen Y IYO 4SN YI AIWS L dNI OL anawa C THINS i 30438 ASSY M3AI323H OL 47373 1 4 NON v lt 509 aug 8 01 5 1 FUN pe 104 13 31 102200 0 93 00 15 XZ9 I 1309405 0 224 359 GEN 19 O d 4 2 Q 2 719 2938 Bas e l 18 i 39M110A i ave zr 914 L y 5 5 sv A 5109812 434338 YOLINOW d 0 A pete NL 26009 s A ASSY 43413235 x SQ Ne tet TON 9 v 83 7 i gio vo i gt i bpi 1 t
421. d 50 vac or greater working voltage you might measure its value to be sure Put this capacitor in the circuit and recheck the frequency response at all frequencies math errors aside it should pass with a high degree of confidence 8 283 FILTERS RESPONSE OF EACH STAGE 8 284 The following are the nominal design responses to each filter in 4935A 8 00 Model 4935A Table 8 13 4935A C Message Filter Filter Input 1 000 volts output in mv U31 1 U31 8 U32 1 U32 7 TP15 1 FREQUENCY STAGE 1 STAGE 2 STAGE 3 STAGE 4 STAGE 5 300 148 900 946 1000 988 852 734 85 Table 8 14 4935A 3 kHz Filter Filter Input 1 000 volts output mv U36 1 U36 7 U36 8 TP15 3 FREQUENCY STAGE 1 STAGE 2 STAGE 3 STAGE 4 100 500 1000 2000 5000 10000 Table 8 15 4935A 15 kHz Filter Filter Input 1 000 volts output in mv Table 8 16 4935A Program Filter Filter Input 1 000 volts output in mv Service 8 61 Service 8 62 Table 8 17 4935A 50 kBit Filter Table 8 18 4935A Notch Filter Filter Input 1 000 volts output in mv U40 7 U51 7 STAGE 1 STAGE 2 U51 14 STAGE 3 FREQUENCY Table 8 19 4935A PAR Filter Filter Input 1 000 volts output in mv TP15 7 TP15 8 FREQUENCY STAGE 1 STAGE 2 300 232 49 1 1000 1312 1566 0 2300 736 492 0 Table 8 20 4935A 150 kHz Low Pass Filter Filter Input 0 20 volts output in mv U33 U28 U26
422. dBm 1 dBm Release the button 4 Press hoth 1350 impedance buttons The display should read 0 0 dBm 0 1 dBm Mode 4935A FREQUENCY Press in both 900 impedance buttons The display should read 0 0 dBm 0 1 dBm Model 4935A Performance Tests PERFORMANCE TESTS 4 21 Hold Tone Dropout Detector Test SETIJT MODEL 4935A Figure 4 9 Hold Tone Dropout Detector Test EQI JITMENT Fluke 5200A AC Calibrator BNC to dual banana test cable 1 310 to RNC adapter Connect equipment as shown in Figure 4 9 2 On 4935 select POWELL a 2265 ws onmi ON DISPLAY ede 2508 Mp hs dns RCV oak e Geeta eae ta aee Daear press in 22 eee po che ade press in RCV 6000 MEASUREMENT esas ena sss NOISE WITH TONE FILTER SG LL nns C MESSAGE D Set AC Calibrator to 10mV at 1004 Hz 4 Lower the AC Calibrator level until Err 7 appears on the 4935A between 3 4 mVrms 5 On 4935A select LEVEL FREQUENCY and read the signal level from the display It should be 46 dBm 2 dBm ABBREVIATED HOLD TONE DROPOUT DETECTOR TEST There is no abbreviated Hold Tone Dropout Detector Test 4 19 Performance Tests Model 4935A PERFORMANCE TESTS 4 22 HOLD CIRCUIT TEST SE T UP MODEL 4935A POWER SUPPLY VOLTMETER S 310 TO BANANA PLUG Figure 4 10 Hold Circuit Test EQUIPMENT 621
423. del 4935A LIST OF ILLUSTRATIONS Section Title Page Section Title Page 1 Model 4935A Transmission Impairment 5 1 Output Level and Transmit Monitor SOL 1 0 Loop Adjustments ecc cette 9 4 1 2 Charge Acceptance at Various 5 2 Receiver Adjustments 5 5 Temperaire 1 6 5 3 Hold Circuit Adjustments 5 9 2 1 Line Voltage Selection 2 1 6 1 Exploded View Case and Covers 6 4 6 2 Exploded View Assemblies and Cables 6 5 3 1 Front and Rear Panel Controls 6 3 Exploded View Battery Option 6 7 Connectors lodiari oot 3 2 3227 IMEASUICTHIODES oar eto 3 6 7 1 A2 Switch Board Component Locator 7 10 3 3 Input Output Switching 3 17 7 2 A5 Charger Board Component Locator 7 14 3 4 Level and Frequency Mcasurcments 3 18 7 3 Partial A5 Charger Board Schematic 4 14 3 5 Message Circuit Noise Measurements 3 19 7 4 Al4 Transmitter Board Component 3 6 C Mcssage Weighting Characteristic 3 20 ERR 7 15 3 7 3 kHz Flat Weighting Characteristic 3 20 7 5 Partial A4 and Schematic 7 16 3 8 Program Weighted liltcr 3 21 7 6 Al4 P AR Transmitter Board 3 9 15 kHz Flat Filter
424. distortion introduced in the output transl ormer sec Figure 8 19 All signals to the TRMT output transformer should be clean sinewaves except in P AR mode or quiet termination n P AR mode the characteristic signal should be present see Figure 8 20 Model 4935A Service 2 GND 2 Figure 8 21 20 Hz Waveform 8 210 TRANSMIT MONITOR 8 211 The transmit monitor circuitry provides signal path used by 4935A receiver circuitry when monitoring the 4935A transmit signal in the display transmit mode Troubleshoot the transmit monitor circuit by monitoring the signal at A3TP9 on receiver board Select the measurement modes in the following table and check for the indicated waveforms Table 8 7 Transmit Monitor Test MEASUREMENT MODE WAVEFORM NOTES 4935A Transmitter Set to 1004 Hz Sinewave 1004 Hz Level and frequency Display TRMT DC level approx Level and frequency Display RCV DC level approx O V Noise Display RCV Characteristic P AR waveform P AR opt 2 and 3 Display RCV See Figure 8 20 8 212 RECEIVER TROUBLESHOOTING 8 213 This section contains troubleshooting procedures for the A3 receiver board Discussed first is troubleshooting the signal path used by 4985A to monitor its own transmit signal this is the XMIT monitor path referred to in the main troubleshooting tree The following parts of thereceiver are checked in the sec
425. e cancelled by the frequency shift in the other direction far end to near end 3 26 ATTENUATION DISTORTION CCEA The attenuation distortion measurement checks the amplitudeversus frequency characteristics of a circuit using a single frequency measurement technique and defines the circuits usable bandwidth To make the measurement a 1004 Hz test frequency is transmitted at the data level At the receiving 4935A the power is recorded as the reference level at 1004 Hz Frequencies between 20 Hz and 110 Hz can be transmitted The different power readings may be compared to the 1004 Hz reference to obtain the frequency attenuation characteristics of the voice channel dBm Model 4935A Operation 3 28 To obtain loss deviations relative to 1004 Hz the LEVELZERO button is pressed during reception of the 1004 I z reference signal The received power level is stored in dBm and simultaneously displayed as 0 dB Level readings taken at other frequencies are compared to the 1004 Hz reference and displayed in dB The 1004 Hz reference level will not have to be subtrartrd from levels at other frequencies to obtain dB readings 3 29 According to telephone industry convention attenuation is defined as a change in loss of a telephone circuit compared to the loss of a nominal 1000 Hz signal on that circuit For example a circuit with 6 dB more loss at 2800 Hz would have an attenuation distortion of 6 dB 3 30 SF SKIP 3 3 SF Skip single freque
426. e 6 3 Replaceable Parts Change 14 36 to HP Part No 0757 0416 RESISTOR 511 OHM 1 Page 8 82 Al4 Transmitter Board Component Locator Replace with Figure 7 6 Page 8 83 A4 Transmitter Board Component Locator Replace with Figure 7 7 Page 8 83 A4 Transmitter Board Assembly sheet 1 of 2 Delete A4C75 the CAPACITOR on the trace between U6 pin 39 and R12 Page 8 85 A4 Transmitter Board Assembly sheet 2 of 2 Modify as shown in Figure 7 8 CHANGE 5 Paragraph 4 15 Table 4 3 Receiver Accuracy Test Table For instruments with serial prefix 2207A and earlier the level tolerance at 11 dBm is 11 6 to 7 0 dBm At 40 dBm the level tolerance is 39 1 to 44 0 dBm Paragraph 4 15 Table 4 4 Abbreviated Receiver Accuracy Test Table For instruments with serial prefix 2207A and earlier the level tolerance is 4 0 to 0 6 dBm Page 6 11 Table 6 3 Replacement Parts Receiver Board Change A3C60 to HP Part No 0160 3291 CAPACITOR 1200 pF 19 Change A3C71 to HP Part No 0160 5257 CAPACITOR 1100 pF 1 Page 6 12 Table 6 3 Replacement Parts A3 Receiver Board Add A3C128 HP Part No 0160 0576 CAPACITOR 1 Add A3C129 HP Part No 0180 0374 CAPACITOR 10 Add A3C130 HP Part No 0180 0374 CAPACITOR 10 uF Add A3C138 HP Part No 0160 0576 CAPACITOR 1 Delete A3C160 hand selected capacitor Page 6 13 Table 6 3 Replacement Parts A3 Receiver Board Add 14 HP Part No 1901 0376 DIODE GE
427. e front panel Autorange set by 10 s digit of Low Threshold An average detector is selected but not used The threshold detector circuitry is used instead of the detector select MUX and voltage to frequency converter Loop around path input grounded RCV display Loop around path input monitors transmitter output TRMT display 8 26 Noise To Ground Standard and Option 001 8 27 DISPLAY TRMT The transmitter provides a quiet termination for the line In put to the power amp is grounded 8 28 DISPLAY RCV The receiver measures the common mode to ground input signal from the front panel 310 jacks The receiver input in RCV display is from the noise to ground input source With the exception of the input source selected noise to ground mode works in the same way as the noise measurement mode 8 29 Peak To Average Ratio P AR Options 002 and 003 8 30 DISPLAY TRMT The transmitter synthesizes the P AR signal defined in Bell Publication 41009 8 31 DISPLAY RCY The receiver measures the signal input to the 4935A front panel jacks It measures the total signal level through the QRMS detector to ensure that the received signal is within the proper level range The signal level is measured by the average detector and peak latch The comparison of these two measurements gives the peak to average ratio P AR The receiver signal path is as follows Balanced input through input transformer in DISPLAY RCV Notch Filter out
428. e rest of the instrument This allows troubleshooting the power supply under no load conditions without endangering the rest of the instrument The other set of jumpers goes into the first 3 pins of J2 they isolate the ac line supplies from the regulators to allow troubleshooting the ac line supplies and the OVP circuit In battery units J2 connects the batteries and charger board to ac line supplies and the regulators 8 24 Model 4935 Service 8 139 CHARGER BOARD THEORY OF OPERATION 8 140 The charger Board has three primary functions 1 It connects the charging current to the batteries 2 The charger board connects the batteries to the unregulated side of the power supply The instrument must be unplugged operate from the batterics 2 If any battery voltage goes too low or if the ac power cord is plugged in the batterics are disconnected from the unregulated side of the power supply and the line supplies are connected 3 Low BATTERY VOLTAGE SENSE CIRCUITRY LOW BATTERY LINE SUPPLIES ON XMITTER BOARD UNREGULATED REGULATED SUPPLY _ON XMITTER BOARDO t7 VOLT 2 VOLTAGE REFERENCES COMPARATORS 15 5V REGULATORS tay FOR 7 VOLT REFERENCE AND LOW BATTERY SENSE BLOCKS FROM tiav L Z a ies cas 5V BATTERIES 3 w sm ee CONSTANT UNREGULATED CURRENT 3 SUPPLY LINES CHARGING CIRCUIT 14 AC L
429. e turned on through CR3 thus and CR5 effectively form OR function Note that the Low Battery Sense Circuit has a regulator for the power supplies formed by Olt and Q9 because of the wide range of voltages seen at the 14 volt unregulated supplies 8 152 When the power switch is turned on QI2 turns off Current flow to R23 stops and the charging current turns off 012 is turned on by R21 and R24 in the STBY mode In the on mode QIO turns QI2 off 14 inverts the base current enabling the 14V battery to turn off Service Model 4935A 8 153 MAINTENANCE 8 151 Maintenance consists of periodic type and failure type maintenance 8 155 Periodic Maintenance 8156 Periodic maintenance should be done at least once per year It consists of preventive maintenance and Adjustment Calibration Preventive maintenance consists of incorporating any modifications to the instrument and cleaning of all assemblies to minimize leakage paths etc Following any preventive maintenance do the Performance Tests of Section IV As part of the Periodic Maintenance cycle do the Adjustment Calibration procedures of Section V 8 157 Failure Maintenance S155 This of maintenance identifies the failure and troubleshoots the instrument to locate the defective part See the troubleshooting procedures of subsequent paragraphs 8 159 Component Replacement 8 160 Failed components can be replaced by any of three methods 8 161 CLIP OUT Clip
430. easuring Set Serial Numbers This manual applies to instruments with serial numbers prefixed 2846 Copyright Hewlett Packard Telecommunications Division 1987 5070 Centennial Blvd P O Box 7050 Colorado Springs Colorado 80933 ALL RIGHTS RESERVED Manual Part No 04935 90029 Printed Nov 1966 Microfiche Part No 0493598804 Printed in U S A Warnings Cautions Model 4935A WARNING SAFETY If this instrument is to be energized via an autotransformer for voltage reduction make sure the common terminal is connected to the earthed pole of the power source BEFORE SWITCHING ON THIS INSTRUMENT the protective earth terrninals of this instrument must be connected to the protective conductor of the mains power cord The rnains plug shall only be inserted in a socket outlet provided with a protective earth contact The protective action must not be negated by use of an extension cord power cable without a protective con ductor grounding Make sure that only fuses with the required rated current and of the specified type normal blow time delay etc are used for replacement The use of repaired fuses and the short circuiting of fuse holders must be avoided Whenever It is likely that the protection offered by fuses has been impaired the instrument must be made inoperative and be secured against any unintended operation GROUNDING Any interruption of the protective grounding conductor
431. ee b j 4 4 4 i 2 n S bn dj 5 si 12 5 5 ES i 5 6 i T it 5 gt hi I 9 E 2 4 pet SD RY STR 3 Qo ors op 210 wo d A 9 0 De z ig i 9 Bi 7 qom 9 TEE 9 A 9 21 19 1 2 4 R 3 F 7 R20 e TP23 4 NI Et p im lows T e e TEN gt gt lt 21 ae 2 R23 2 212 212 yz TE bet AGE i TN ig Ve a1 MA 5 j3454s 5 9 fee D iss c w NS Sc 627 E E TE i fpi 2 i T Vou 2 i 2 i 5 4 R 4 4 x E 4 z 22040 x o 4 E 1 x 4 gt 3 4 4 4 a 3 a x oe n 5 P 05 1 045 TE e 3 3 a 922 26 1 1 6l I p i i i 8 E uy aY n gt 7 PU i 5m di Ws 2 m 2 2 Dax 1 e in 4 a 4 i z 5 2 T 7 P 2 4 3 RY RY B e 6 r 1 ace 9 4
432. ent NRFR not recommended for field replacement NS normally shorting nanosecond NSR not separately replaceable NYL nylon OBD order by description OD outside diameter ORN orange Model 4935A Replaceable Parts Table 6 1 Reference Designations and Abbreviations 2 of 2 ABBREVIATIONS x pico 110 printed circuit printed circuit assembly picofarad Peak Inverse Voltage pegk panel positive negative positive peak to peak parts per million polycarbonate polyethylene polystyrene porcelain position s pozidrive peak reverse voltage peak working voltage Dart of SZ ning T random access memory TA read only memory TEL rectifier TC radio frequency right hand THKNS root mean square TI round TGL right hand THD resistor transistor logic THK retainer TOL rotary TRMR rivet reverse working voltage second slow blow silicon controlled rectifier selenium single silicon shank single in line package socket solder spacing single pole double throw single pole single throw stainless steel steel tantalum telephone Temp Compensated temp coefficient thickness titanium toggle thread thick tolerance trimmer turn transistor transistor logic typical micro 109 microfarad microseconds volt s vartable voltage controlled oscillator direct current working volts violet no polarity voltage watts weight wirewound wh te wip
433. er NOMINAL PHASE FREQUENCY NOMINAL LOSS RESPONSE Degrees 140 625 390 625 640 625 890 625 1140 625 1390 625 1640 625 1890 625 2140 625 2390 625 2640 625 2890 625 3140 625 3390 625 3640 625 3890 625 Table 8 28 Bell 41009 Notch Filter Filter Input 0 0 with 15 kHz flat ACCEPTABLE OUTPUT LEVEL FREQUENCY minimum maximum lt 400 Hz 400 lt f lt 862 Hz 862 lt f lt 995 995 lt f lt 1025 1025 lt f lt 1182 1182 lt f lt 1700 1700 f 8 65 8 66 blank HULIQ 89 8 29 8 oj4 1 16 Z 8 ni ze s UT Sus k 1713 CTWNOTIdO B d 1 i 98 aff 2208 Wai li 0 1 9 ort 1804 0 1 0 ite 1 i E31714 2 T eS iaa 1914 3 HYN3 x a NECI T Bald 39YSS3 2 j i 936 b i BEN 3030 13 rite eres E i 03 01 SIN3A3 123136 H21Y1 KAW 93 713 4 32 122136 i3 mee 2222 123136 EENT i le 5314102 0 13437 123135 Tt 13538 ig WB23INTI ed 3300230 H31NnO2 GiUmI E S
434. er working inverse voltage washer times multiple yellow zener phi phase Replaceable Parts 6 4 i O cO OND OBR OW no Model 4935A DESCRIPTION HP PART NO QUANTITY Case top half ely yes Front Cover 5046 1496 Instruction Card 0493590018 Handle Case 5040 4470 Cap Handle 7120 5370 Screw Machine 2520 0014 Foot Bumper 5041 6750 Screw Machine 2520 0014 Case Bottom Half 5940 4476 Metal Rod 7205 0356 Spring Handle 1460 2096 fees CAREC 9096 5296 Figure 6 1 Exploded View Case and Covers Model 4935A Receiver Assy Std Receiver Assy P AR 04935 60068 Coax Cable 0493560009 Shield Metal Mounting 04935 00002 Cable 4 wire twisted 5060 7167 Switch Board Assy 04935 1102 Front Panel Std 04935 Front Panel P AR 04935 4 Knob Output Level 0370 Knob Monitor Volume 0370 089 Key Cap White 5041 0201 Nut Hex 2950 0087 Washer 5 16 375 3050 1 288 Binding Posts Dial Jacks 1510 0131 Insulator 04936 40001 Washer No 6 147 ID 3050 0100 Nut No 6 2420 0023 Washer Flat 3050 0105 Transmitter Assy Std 04935 60388 Transmitter Assy P AR 04935 6038T Figure 6 2 Exploded View Assemblies and Cables 04935 60004 Replaceable Parts QUANTITY ee eee ee eae S 3 PC 3 SY aD pe ME Replaceable Parts 6 6 Model 4935A ITEM DESCRIPTION
435. er repair information SECTION II INSTALLATION Contains unpacking and inspection information power requirements packaging and storage instructions SECTION III OPERATION Includes an explanation of controls connectors indicators and an automatic self check procedure Describes measurement principles and front panel instructions for making each measurement SECTION IV PERFORMANCE TESTS Gives test procedures required to verify that the instrument s performance is in accordance with the specifications SECTION V ADJUSTMENTS Provides adjustment and calibration procedures SECTION VI REPLACEABLE PARTS Lists and identifies the instrument assemblies and replaceable parts SECTION MANUAL CHANGES Cor tains information to backdate the manual for instruments with earlier serial numbers SECTION VIII SERVICE Includes theory of operation troubleshooting procedures flowcharts component locators and schematic diagrams 1 3 GENERAL DESCRIPTION 1 4 HI Model 4935A is a Transmission Impairment Measuring Set TIMS which measures wideband data and voice impairments The frequency range over which measurements are made is 20 Hz to 110 kHz in steps of I 10 100 1000 or 10 000 Hz There are four permanently stored fixed frequencies 404 1004 2804 and 2713 Hz Any other four frequencies may be temporarily assigned and stored by the user 1 5 INSTRUMENT IDENTIFICATION 1 6 character serial number
436. erter 0733 The procedure is as follows 1 Put the 4935A in level and frequency mode The frequency 128 Hz 25 Set up 5004 signature analyzer a Connect the start and stop with the inputs of the 5004 connected to TP6 Start and stop on the positive transition both buttons out b Connect the clock input of the 5004 to TP7 and clock on the negative transition pushbutton in Connect ground to TP 9 or any clean digital 5 The reference signature for 5 P254 remember to push reset button The following IC pins can be checked 8 37 Service 8 38 55CU AAHU 0000 L 3PCH 0000 L 1U5P 21P3 0000 L 86C3 P688 603A 0000 L PFFA 0000 L 1665 P254 H P254 H 1U5P UHOA 55CU 488C AAHU 0000 L P254 U665 1431 PFFA P688 826P 603A P254 H Table 8 3 Reference Signatures 7CU5 2 3HUA 3 0000 L 4 9422 5 0000 L 6 FA11 7 5P33 8 0000 1 9 FC6F 10 6U4A 11 7 5 12 0000 L 13 25 1 14 0000 L 15 12U0 16 P254 H FC75 65 0000 L 8HC7 0000 L 46HC FC6F 0000 L 21P3 2482 9241 0000 L 15U7 0000 L P254 H AAHU 1U5P 9241 8AUC 65CA 46HC C7A5 12U0 619H 4P69 9C3U 0000 L 2350 H679 803A 63H5 42 0 0000 L P254 0000 L P254 H 603A U665 P254 H Model 4935A Model 4
437. es factory selected value Manual Changes Mfr Part Number 2100 3882 1 8 3831 4 1 8 5761 4 1 8 3481 4 1 8 3831 CR 1 8 TO 1002 F CR 1 8 TO 5001 F CR 1 8 0 61 1R F C4 1 8 TO 511R F C4 1 8 TO 511R F 2100 3883 C4 1 8 TO 1002 F CR 1 B TO 751 F 4 1 8 1582 4 1 8 1582 4 1 8 T9 11R B 0698 6 360 CA 1 80 TO 2371 F 4 1 8 1963 CR 1 8 TO 101 F C4 1 8 TO 5111 F C4 1 8 TO 4641 F 4 2152 0698 6360 C4 1 8 1O 1331 F C4 1 8 TO 1331 F 4 1 8 1002 2100 3882 1 8 1002 4 1 9 1962 TO 1212 F 2152 F 4 1 8 1001 1 8 2371 CA 1 8 TO 2371 4 1 8 0 1211 4 1 8 2151 2100 3881 4 1 8 10 1003 C4 1 8 TO 2323 F 0699 0595 0699 1078 4 1 8 1133 0698 4158 0698 6360 0698 4158 0698 6360 4 1 8 2942 C4 1 8 TO 2942 F 0699 566 0699 0566 C4 1 87 TO 1001 F T9 1111R B 0698 636 0698 8638 0698 6445 0699 0586 0699 0585 068 6467 0699 0587 0699 0588 2100 3883 7 63 Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued Reference HP Part Mfr Part Designator Number D Description Number A13R103 0698 7413 p RESISTOR 17 4K 25 125W TC 0 100 4C1 8 TO 1742 C A13R104 0698 6423 2 RESISTOR 31 25 190 125W 0 25 0698 6423 13 105 0688 7413 2 RESISTOR 17 4K 250 125W 0
438. f either level is out of tolerence perform the complete Distortion Test before troubleshooting Table 4 15 Abbreviated Distortion Test FILTER DISPLAY C Message 73 dB 2 50 kBit 58 dB 1 4 24 Model 4935A Performance Tests PERFORMANCE TESTS 4 24 P AR Test SETUP AC CALIBRATOR E oe Figure 4 14 P AR Test EQUIPMENT Fluke 5200A AC Calibrator I BNC to dual banana test cable 1310 to BNC adapter 1 Connect equipment as shown in Figure 4 14 4935A select POWER ee DISPIZAY REY DL lt press in SETUP press in both 6000 buttons BRG out MEASUREMENT m Huet P AR 2 Set the AC Calibrator for a 300 Hz sinewave at 0 495 Vrms 3 9 dBm For each frequency in Table 4 16 check that right display is within the acceptable limits Table 4 16 P AR Filter Responses FREQUENCY ACCEPTABLE LEVEL 1 Press DISPLAY to change 4935A to TRMT mode The right display should read 100 1 5 Vary the OUTPUT LEVEL to obtain a left display reading between 12 dBm and 1 dBm The P AR reading in the right display should not change by more than 1 P AR unit ABBREVIATED P AR TEST 1 Perform only steps 4 and 5 of the P AR Test Performance Tests 4935A PERFORMANCE TESTS 4 25 Noise To Ground Standard and Option 001 SETU GROUND LUG AC CALIBRATOR MODEL 4935A SHORTED 3
439. ference HP Part C Mfr Part Designator Number D Description Number A6 04935 60108 REAR PANEL ASSEMBLY 28480 04935 60108 AGLF 9135 0284 LINE MODULE FILTER 28480 0960 0443 A6T 1 9100 4205 TRANSFORMER AC POWER 28480 9100 4205 0360 1251 TERMINAL SLDR LUG FOR 12 SCR 28480 0360 1251 0890 0311 TUBING HS 187 D 093 RCVD 00000 ORDEI BY DESCRIPTION 0890 0100 TUBING HS 0983 D 046 RCVD 00000 ORDER BY DESCRIPTION 1400 0249 CABLE TIE 062 625 DIA NYL 06383 PL1M 8 1510 0038 BINDING POST ASSY SGL THD STUD 28480 1510 0038 2190 0027 WASHER LK HLCL 1 4 IN 255 IN ID 28480 2190 0027 2360 0242 SCREW MACH 6 32 1 25 IN LG 00000 ORDER BY DESCRIPTION 2420 0023 HEX W LKWR 6 32 THD 094 IN THK 00000 ORDER BY DESCRIPTION 2950 0006 NUT HEX DBL CHAM 1 4 32 THD 00000 ORDER BY DESCRIPTION 8150 2846 WIRE 18AWG 300V 19X30 105C 28480 8150 2846 04935 00001 REAR PANEL BLANK 28480 04935 00001 7100 1288 TRANSFORMER COVER 28480 7100 1288 04935 61601 JUMPER CABLE 28480 04935 61601 04935 61602 JUMPER CABLE 28480 04935 61602 See introduction to this section for ordering information 7 59 Model 4935A Manual Changes Table 6 3 Replaceable Parts Continued HP Part Number Description Mfr Part Number Reference Designator A13 04935 60006 6 1 RECEIVER BOARD WITH PAR 28480 04935 60006 13 1 0180 3124 7 1 CAPACITOR FXD 75UF 100 20 300VDC AL 28480 0180 3124 A13C2 0180 1746 5 3 CAPACITOR FXD 15UF 10 20 56289 1500156 9020
440. giat Pato cd wl Coo gt 1 9i 9 Y M SEM A Lu 1 Se Tt i ONE rm yv T m 2 831713 ONG OL 350 gt 14002 333478 JALON i L li sia i 1 i i 1 i Ed 1 1 i 1 IE i E l L NO 1 21007 iim 18 Pm AT 0 127004 SY i 031 i gt i pi i 53821165 COTeN il i PO 4 iL 5 i uk i 2 i i asee 319094 i i id 1 a rd ILON CC t 2 ead 2 74 i LT UG Ix B i 1 i i i 1 EE RECTE i Pod 1 i MATT ns 5 tr rte i j nr P x 13 7 gt eh 3317173 35753 __ LLL di Ui A iets i 1 T 1 T im 1 Atl S Avie I d ie l 1 i US j 129 i T i T L
441. gic 1 If select address 110 is not present there is a microprocessor latech A3U 11 chip enable or bus problem or the jumper in 15 missing Check for a signal at 15 2 3 9v 1004 Hz If the signal is present A3U37 or buffer A3U48 have failed If no signal is present at TP15 pin 2 then buffer 1 52 has failed 8 45 Service Model 4935A 8 227 Simplified Autorange Check 8 228 l Check Section VII Manual Backdating before troubleshooting the autorange or 150 kHz low pass filter 2 Check for a signal 3 9v 1004 Hz at TP25 If the signal is present go to paragraph 8 229 If not continue NOTE The housing of Jt ts not connected to ground and another signal ground must be provided 3 Check the MUX select address at JUA pin 16 logic 0 pin 15 logic O pin 14 logic pin 13 logic 0 If these addresses are not present there is flatch A3U 17 chip enable line microproces sor or a data bus problem or the latch is being loaded down Fix and return to step t 4 Check a signal at A3U26 pin 6 0 39 vP P 1004 2 If the signal is present buffer A3U25 has failed Signal at A3U26 15 2v for serial prefix 2207A and earlier 5 Check for a signal at A3U28 pin 6 0 39 vP P 1004 2 signal is present 30026 LPF has failed 6 Check for a signal at A3U33 pin 6 0 39vP P 1004 If signal is present 3028 LPF has failed 7 Check for a signal at A3U29 pin 6 0 3
442. he DIP switch between pins 3 and 14 of JU3 1 l6 open 2 1 5 3 14 closed and 4 1 3 closed The signal at TP14 should drop to 1 300th or less than tts original level If not U34 or the notch filter has failed For a more complete test of notch filler see the Performance Cheeks in section IV Open the DIP switch between pins 3 and 14 at JU 8 244 Check the 25 dB amp Reduce the input signal until the signal at TP14 is about 2v P P Open DIP switch pins 4 13 at JU3 1 16 open 2 15 3 14 4 1320pen Signal at A3U6 should be ap proximately 3 5v If not 25 dB amp is bad Close DIP switch pins 4 13 of JU3 8 245 When finished remove the jumpers on the DIP switch Icaving all pins open 8 246 NOISE FILTERS 8 247 M any noise filter responses are incorrect go to paragraph 8 280 and troubleshoot cach filter Stage 8 248 8 249 Loop 4935A TRMT 310 jack to the RCV 310 jack through attenuator HP 4436A Set the attenuation O dB 2 Adjust the signal level to approximately 5 0 dBm 3 9v P P Monitor the autorangc output at 2 5 NOTE JI case is not grounded so some other signal ground must be uscd 8 49 Service Mode 4935A 4 Leave the attenuator inputs and outputs floating and ground the attenuator case to the 4935A Step the attenuator from to 60 dB attenuation in steps of 109 dB With each the autorange output will drop and then stabilize at its
443. he OUTPUT LEVEL control The wideband low pass filter is switched in For measurements using the other filters the loop around signal path is connected to ground 8 24 DISPLAY RCV The receiver monitors the level of the input signal through the selected noise filter The 1004 Hz component of the signal is notched out and the residual noise routed through the selected noise filter The noise is amplified by the autorange circuit which is set according to the 10 s digit of the low threshold level selected This enables the user to set the autorange to a desired state while troubleshooting the receiver Table 8 2 Noise Amplification 105 DIGIT AUTORANGE OF LOW THRESHOLD AMPLIFICATION 8 5 Service Model 4935A 8 25 After being autoranged the noise is full wave rectified and sent to the impulse noise comparators where it is compared to three preset thresholds These thresholds are set by the microprocessor through the receiver board D to A converter and associated circuitry Outputs of the comparators go to microprocessor and counting circuit where they are processed to limit the repetition rate to about 8 per second and counted by the microprocessor The processor keeps a running total of the number of counts from each comparator and also keeps track of the test time interval Receiver signal path is as follows Balanced input through input transformer Notch filter in 25 dB amp out Noise filter selected from and displayed on th
444. hey shall not be placed on removable parts likely to be detached orlost Instruction Manual symbol If necessary to preserve the apparatus from damage 15 necessary for the user to refer to the instruction manual then shall the apparatus be marked with this symbol 348 16a Terminal devices fad from the interior by live voltages that may be dangerous when connecting to ordisconnecting from those devices shall be marked with the flash shown when the voltage exceeds 1 KV The flash shall be red 348 18c Earth Terminals f the use of this symbol for the protective earth terminal 15 not permitted by National Standards it may be modified for example by being placed inside a circle 348 18 AC 117 1 symbol 3 DC curent 117 1 symbol 2 DC 1 17 1 symbol 8 Frame chaws connection The hatching may be com pletely or partly omitted if there no ambiguity If the hatching isomitted the line representing the frame or chassis shall be thicker 117 1 symbol No 87 Ampere 1174 symbol 356 Rien Volt 1174 symbol 357 Voltampere 1 EC 1174 symbol No 358 w Watt 1 EC 1174 symbol No 360 Wh Watthour 1 1174 symbol 361 VAh Voltamperehour 1174 symbol 362 Hz Hertz IEC 1174 symbol No 365 Contactor normally closed In order to avoid confusion wi
445. i 1200P Sh e 1 5 2 CURRENT VOLTAGE CONVERTER R68 AH n SEEN E 8250 R35 GITAL TC ANALOG RAI N OUTPUT LEV CONVERTER a IOPF 1000 Er k NC az C23 16 2 jud C46 NECEM I MSB 5 I C36 EE RTO 859 450 909 681 933 3 2 3 X t 3 Y 4 4 120 4 WIDEBAND a Say OW PASS FILTER 00 58 1 0 9 4 3 TRANSMIT E GND m wi een pee en asa m 3 om on n cd 45V TPII P O REAR PANEL ASSY 1 eo SUPPLY SECTION ds JU 45 Don cal 71 M T CROWBAR OVERVOLTAGE PROTECT CIRCUIT o 1 960 fee NT E D 5V8 amp 4l4v CR 7 ule T OVERVOLTAGE o SENSE d p CL C30 L62K i NM i 29 MEN 65 ENS 330 100K i i PIS L
446. ic Diagram Sheet 4 of 5 8 87 A4 Transmitter Board Schematic Diagram Sheet 5 Of 8 89 A5 Charger Board Component Locator 8 90 A5 Charger Board Schematic Diagram 8 9 1 Table of Contents 2 1 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 10 4 11 4 12 4 13 4 14 4 15 4 16 6 1 6 2 Model 4935 LIST OF TABLES Title Page Specifications 1 2 Recommended Test Equipment 1 5 List of Parts Used for Performance et E 1 5 PPP Se 5 yku ua un 2 3 Transmitter Flatness at 10 dBm 4 3 Transmitter Flatness at 40 dBm 4 5 Abbreviated Transmitter Flatness 4 7 Receiver Accuracy Test Table 4 9 Abbreviated Receiver Accuracy A 9 Autorampe Tes 4 10 C Messace Filter Test eene dus 4 11 Filter estu uuruuu 4 12 kiz Filter 4 12 Program Filter Des atn es 4 12 50 Filter Test 4 13 Notch Filter eere 4 13 Impulse Noise DAC 4 15 Filter Circuit Parts List 4 23 Abbreviated Distortion Test 4 24 P AR Filter Responses 4 25 Reference Designation and
447. ier input to thr 4935A TRMT 310 jack Monitor the 20 amplifier output with the voltmeter d Adjust the 4935A OUTPUT LEVEL control until the voltmeter reading is the same as the 20 dB amplifier output voltage in step b The AC Calibrator and the 4935A are both se to exactly 40 dBm NOTE A 600 ohm termination is provided by the 20 dB amplifier in the Diagnostic Service Kit and must be added if a high impedance amplifier is used 3 4 Model 4935A Performance Tests PERFORMANCE TESTS 1 Do not change 40 dBm setting the AC Calibrator 4935A OUTPUT LEVEL settings during the rest of this test 5 Connect the AC Calibrator to the 20 amplifier input a Set the AC Calibrator to 20 Hz b Record the voltage C From Table 4 2 locate the horizontal voltage line closest to the recorded voltage reading Use this voltage line see example EXAMPLE Ifthe Voltmeter reading is 71 0 mV locate the 71 0 mV line from the Vou column of Table 4 2 Locate the 20 Hz frequency column The allowable voltage reading when the AC Calibrator is substituted by the 4935A transmitter is 79 7 mV to 63 3mV 6 Substitute the 4935A TRMT output in place of the AC Calibrator Use the STEP UP or STEP DOWN buttons in conjunction with the or buttons to set the 4935A TRMT frequency to 20 Hz ido not adjust the OUTPUT LEVEL 7 From Table 4 2 locate voltage line identified in Step 3 In the vertical frequency column frequency unde
448. ividual signals for high mid and low thresholds to the receiver board 8 102 TRANSMITTER 8 103 The transmitter circuit is responsible for digitally synthesizing the 4935A output signal It takes inputs from the microprocessor through the data bus I O port 1 which determines the frequency and type of output waveform The transmitter circuit supplies outputs through a transformer to the switch board for the output 310 jacks and to the receiver circuit to internally monitor the transmitted signal through the transmitter monitor loop around path 8 19 Service Model 4935A 8 104 Test Signal Generation Method amp L05 SINEWAVES If the instantaneous voltage of a sinewave is sampled at many points in time along the wave a series of numbers representing the wave is obtained Each number represents the voltage of the sinewave at a single point in time This series of numbers can be saved in ROM and later recalled by stepping through or scanning the ROM Convert this series of numbers back to a series of voltage levels and the result is a stair step approximation of the original sinewave 65536 Hz Figure 8 11 Stair Step Sinewave 8 106 difference between the original sinewave and the stair step approximation occurs only at frequencies higher than the original sinewave frequency These high frequency distortion components be eliminated with a filter leaving a very good approximation of the original sinewave 8 107 This 18
449. le 41 The 4935A display should bc within the range given NOTE Test must bc performed in sequence given Table 4 11 50 kBIT Filter Test FREQUENCY RECEIVED LEVEL dBrn in Hz ACCEPTABLE READINGS NOTCH FILTER TEST L Select the I5 KHz filter and NOISE WITH TONE measurement on the 4935A 2 Check the at each frequency in Table 4 12 The 4935A should bc within the range given Table 4 12 Notch Filter Test FREQUENCY RECEIVED LEVEL dBrn in Hz ACCEPTABLE READINGS NOTE At 400 tlz the DISPLAY FREQUENCY will not be stable ABBREVIATED FILTER TEST Therc is no abbreviated Filter Test 4 13 Performance Tests Model 4935A 4 18 SETUP PERFORMANCE TESTS IMPULSE NOISE DAC TEST AC CALIBRATOR MODEL 4935A Figure 4 6 Impulse Noise DAC Test EQUIPMENT 11 1 13 14 Fluke 5200A AC Calibrator to dual banana test cable I 310 to BNC adapter onnect equipment as shown in Figure 4 6 On 1935A select POWER ON DISPLAY RCV SET UP press both 6000 buttons MEASUREMENT I IMPULSE NOISE FILTER 16 kHz FLAT Filter IMPULSE NOISE press PERIOD to select NON STOP press DISPLAY to select LOW SET press START RESET Left display adjust threshold to 90 dBrn Set AC Calibrator signal source to 2 kHz at the levels given in Table 41 3 start with 0 580 V The 4935A should start counting Raise the 4935A LOW THRESHOLD BY 1 dBrn The
450. le are 15513A Test cord w 310 male at both ends 18132A 19 Rack Mount Adapter ISI SIA Soft pack Carrying case Ladder Bracket 04935 60014 Diagnostic Service 152 4 3 0 To AlIbATOE 1 19 WARRANTY 1 20 Instrument warranty is as listed on the inside of the front cover Battery warranty is 90 days 1 21 RECOMMENDED TEST EQUIPMENT AUS Recommended test equipment is listed in Table 1 2 Equipment with equivalent characteristics may be used Model 4935A Table INSTRUMENT CALIBRATOR OSCILLOSCOPE SYNTHESIZER FUNCTION GENERATOR MULTIMETER DIGITAL MULTIMETER DUAL OUTPUT POWER PLY SUP DUAL RANGE DC POWER SUPPLY AUDIO ANALYZER COUNTER p Table PARI NUMBER IF APPLICABLE 0698 7364 0698 7408 0698 63 44 HP 11095A 1250 0781 1251 3757 0493560014 PERFORMANCE TESTS General Information 1 2 Recommended Test Equipment MODEL CRITICAL SPECIFICATIONS RECOMMENDED USE OUTPUT LEVEL 1 mV TO 1 OV FREQUENCY 20Hz TO 11 OkHz ACCURACY 0 1 gt 7mV FLUKE 5200 OR EQUIVALENT 15MHz BANDWIDTH A VS B CAPABILITY HP 1740A PAT OUTPUT LEVEL 1 mV TO 1 OV FREQUENCY 20Hz TO 110kHz ACCURACY 0 196 gt 7mV HP 3325A AND FUNCTIONS AC VOLTS 1V 1000V DC VOLTS V TO 1 COOV BALANCED INPUT HP3455A CURRENT 1 AMF MAX HP 3466A HP 6234A HP 6218A HP 8903A HP 5315A 12 AN
451. ler 8 62 4935A 150 kHz Low Pass Filter 8 62 4935A 110 kHz Low Pass Filter 8 63 41009 C Message Filter 8 63 41009 3 kHz Hilter 8 64 Bell 41009 15 kHz Filter 8 64 Bell 41009 Program Filter 8 64 Bell 41009 50 kBit Filter 8 65 41009 Filter 8 65 Bell 41009 Notch Filter 8 65 1 0 x m General Information E Frat MLE vers CLR Heke RAGE Bus Ux RN D xe Duos e TS Dj Boers RL BE P aac cosy igeosose tO GND Model 4935A Figure 1 1 Model 49354 T Model 4935A SECTION GENERAL INFORMATION INTRODUCTION 1 2 This Operating and Service manual contains information to install operate maintain and service the Model 4935A Transmission Impairment Measuring Set TIMS Figure 1 shows the HP Model 4935A with cover and power cord The manual is divided into eight major sections which provide the following information SECTION I GENERAL INFORMATION Provides identification specifications related manuals and us
452. lerance components among U30 R75 R76 and C57 R75 and C57 especially If all looks correct C57 and C160 need to be hand selected Service 8 59 Service Model 4935 8 282 Hand Selection Of C57 And C160 step 1 Measure the frequency response of the receiver at the frequencies noted in Table 8 12 and record them in dB Table 8 12 Hand Selection of C57 and C160 CAPACITOR FREQUENCY RESPONSE measured circle 1200 09 06 1300 1400 pF 03 1500 pF ref 03 1600 pF 1700 pF 07 1800 pF 10 Others approximately N 03 per 100 pF Net Response Add Step 2 Look in table and pick a capacitor to make overall frequency response be within specification The specification should be 7 4 dB at all frequencies Some judgment should be used to make the overall frequency response as flat as possible Select a capacitor that makes the highest error 3 dB if we were too high at 85 kHz Note that the maximum may occur anywhere between 60 to 85 kHz typically Probability of being too low in the 40 kHz region is minimal After picking this new capacitor calculate the new theoretical frequency response by adding A and B for the new capacitor value chosen if it looks good continue to Step 3 Step 3 Get a capacitor of the value chosen it can be any mica capacitor of any tolerance an
453. m by IO dB The various gain states are software controlled Determination of the correct state is determined by measuring the detector output voltage and changing the gain in 10 dB steps until the detector output falls within the dynamic range of the detector 8 96 150 kHz LOW PASS FILTER The properly amplified signal is routed through the 50kHz filter 3 dB This filter is a sixth order Butterworth low pass filter It is comprised of three second order stages connected in series Model 4935A Service 8 97 Level Detectors 8 98 DETECTOR CIRCUIT The detector circuits convert inputs to dc output levels proportional to the input signal level The 4935A uses three different detectors Fullwave average QRMS and a Peak Detector All of the detectors require a full wave rectified signal 8 99 The full wave rectifier combines the input ac signal with a halfwave rectified signal of twice the peak amplitude to produce a full wave rectified signal The average detector takes the full wave rectified signal and low pass filters it to produce a level output 5 The QRMS detector sums peak and the average voltage signals Different scaling factors are used for the peak and average levels making the output of the Quasi RMS detector approximately equal to the RMS value of the input waveform 3 The P AR peak detector uses the fullwave rectifier a non inverting buffer and a peak detector to produce a dc level equal to the peak
454. mes which cause condensation within the instrument 2 16 STORAGE AND SHIPMENT 2 17 ENVIRONMENT 2 18 4935A all options may be stored and shipped within the following environmental limits Temperature 20 C to 45 C Do not store or ship where temperature extremes will 4 F to 113 F cause condensation within the instrument Humidity 90 R H 65 C 2 19 INSTRUMENT PACKAGING 2 20 ORIGINAL PACKAGING Containers and packing material used in factory packaging can be obtained through Hewlett Packard sales and service offices listed at the rear of this manual If the instrument is returned to HP for repair attach a tag listing the type of service or repair needed Include return address model number option number if applicable and complete serial number Also mark the container FRAGILE to ensure careful handling In any letters refer to the instrument by model number option number if applicable and complete serial number 2 21 OTHER PACKAGING Use these general instructions for packaging with commercially available materials a Wrap the instrument in heavy paper or plastic If shipping to an HP Sales or Service Office include a tag listing type of service needed return address model number option number if applicable and complete serial number b Use a strong shipping container such as a double wall carton with 275 Ibs burst test C Use a layer of shock absorbing material 70 100 mm 3 4 in thick
455. microprocessor The microprocessor writes to the display system chips by sending a control word tothe chip AO LOGIC AND CEI OR PULSING 8 60 INSTRUMENT TO OPERATOR 8 61 There are two lines of communication from the instrument to the operator note that neither is microprocessor controlled 8 62 Monitor Amp 8 6 3 audio amplifier and speaker are provided to monitor test signal being measured by 4935A receiver The monitor amplifier takes its input from the output of the receiver autorange circuit The monitor amplifier monitor volume control and speaker are located on the switch board 8 64 Beep Generator 8 65 The beep circuit located on the switch board provides audio feedback to alert the operator when a membrane switch closure has been sensed Whenever a front panel membrane switch is pressed the keyboard interrupt circuitry provides both an interrupt for the microprocessor and a pulse causing an audible beep from the monitor amplifier and speaker 8 66 OPERATOR TO INSTRUMENT 8 67 There are several operator commands which cannot be sensed by the microprocessor including the input NOR and REV buttons the set up buttons excluding RCV impedance select the OUTPUT LEVEL control and the MONITOR VOLUME control 8 68 MISCELLANEOUS CIRCUITRY 8 69 IMPULSE NOISE DETECTORS The impulse noise latches perform two functions for each of 3 threshold signals from the receiver Non retriggerable monostable one
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457. n 8 reads ground then the regulator is enabled less than volt gives shutdown signal 2 If the voltage at 5 is wrong has too much ripple a Check that the reference voltage at 14 pin 6 15 approximately 2 5v 5v supply also 2 5v for 14 supply not replace 414 b Check the 5 voltage sense divider R33 R37 and R42 R19 R23 and R31 for the 14 regulator Model 4935A Remove pass transistor Q4 for the 5 v supply Q3 for the 14 v supply and check U14 for the following voltages 014 pin Voltage 7 GND 10 1 6 11 pin 10 12 8 to 14 v NOTE Removing Q4 or Q3 may require pressing on the line moduleretaining springs and sliding the line module out of its hole When reinstalling pass transistors Q3 Q4 or 91 remember to install the insulating shoulder washer d If pin 10 is greater than 2 0 v or less than 1 2 v check CR19 CR20 If pin 12 is incorrect check ac supply and A4J2 jumpers Replace U14 if the other voltages are wrong Jumper A4J2 pins 2 and 11 to enable the 14 v regulator Check A4J U 14 for 14 v 20 mv if correct go to Step 6 If incorrect troubleshoot as in Step 3 above referring to U8 INSTEAD OF U14 Pin 12 of U8 should be 21 v to 25 v 6 Jumper A4J2 pins 12 to power the 14 v regulator Note that the 14v OVPis more complex than the 5 v and 14 v OVP a If the fuse blows check the overvoltage protection circui
458. n adjusted a single diagonal line will appear Externally loop the 4935 TRMT and RCV 310 jacks Select LEVEL FREQUENCY measurement mode Set the 4935A frequency to 1300 Hz Adjust the OUTPUT LEVEL for a left display of 0 0 dBm Set the Oscilloscope to 0 2 volts per division Connect channel A to TP15 pin 2 and channel B to TP15 pin 7 Adjust Al 3R153 PAR PHASE 1 to obtain a 0 degree phase close waveshape loop Move Oscilloscope channel A probe to TP15 pin 8 Adjust A13R175 PAR PHASE 2 to obtain a 0 degree phase difference Select PAAR measurement mode on the 49354A Adjust 13 186 PAR DET until the display reads 100 Model 4935 5 19 Ad justment Calibration ADJUSTMENTS Oe 2 F en HOLD CIRCUIT ADJUSTMENTS i O AZ ee 279 R 2 A E oy S 5 2 F P p x A FS gt lt A2 Switch Board Assembly 2 n d 6 2 2 Zi 7 me SET UP MODEL 4935A POWER SUPPLY MILLIAMMETER TO BANANA PLUG FIGURE 5 3 Hold Circuit Adjustments EQUIPMENT AC DC Voltmeter H P 3455A Miliammeter HP 3466A Power Supply 62 1 HA PROCEDURE Connect equipment 45 shown in Figure 5 3 Chcch the power supply output with the DC Voltmeter Adjust the output to 6 9V 2 VDC On 4935A select DISPLAY TRMT NOR press SET UP press in TRMT HOLD press in HOLD Adjust A2R53
459. n on If not check K LR I E T F3 CR I CRIOCR31 CR3 and 14V batteries Remove the jumper from A5C3 Cycle the power from ON to STBY to shut the unit down Connect 4935A to AC power source and turn Without turning the 4935A OFF disconnect the AC power from thc unit Momentarily ground collector of Q3 The 4935A should turn on and stay on a If it does not turn on R4 Q4 C2 and Q2 are suspected If the unit comes on but does not stay then CR2 CR6 R2 R3 R5 Q3 and are suspected C If the unit turns on and stays on but will not turn on when the power switch is recycled then F2 R5 the power switch and the wiring are suspected AC And Low Voltage Inhibit Troubleshooting Connect 4935A to an AC power sourcc and turn on NOTE When the 4935A ts operated on AC power the low voltage and AC inhibit sense circuits take power and sense inputs from the A4 transmitter board The circuits are not affected by the battery or charge circuitry Cheek 15 5V regulated supply Ulpin3 and U2pin8 should be between 14 and 16 5V If not check 17 and R29 Cheek the 15 5V regulated supply Ulpinl2 and U2pin4 should be between 14V and 16 5 If not check Q9 CR 1 5 and R19 the 15 5V regulated supplies are used only Ul and U2 on the charger board U2 takes its input from the 14V regulated supply on the A5 charger board and cs tablishes 7V references 8 55 Service 5 50
460. nal noise is then compared with the original signal plus noise signal computed signal to noise ratio is displayed in units of dB Figure 3 1 2 illustrates this measurement This is one of the most important parameters for determining the quality of a line 3 22 Model 4935A Operation Hes poe dB 30 40 50 1000 2000 3000 5000 Frequency Hz Figure 3 1 1 C Message Weighting with Notch Characteristic dBm 1004 Hz dBm dB SIGNAL NOISE COMPARE 1004 Hz NOISE NOTCH ONLY TELEPHONECIRCUIT 1004 gt gt 0 0 FILTER RCV TIMS SIGNAL NOISE S T N RATIO 10 LOG NOISE Figure 3 12 Signal to Noise Measurement 3 23 Model 4935A 3 24 3 48 SINGLE FREQUENCY INTERFERENCE 3 49 Single frequency interference refers to unwanted steady tones which may appear in lines Occasional bursts of low level tones which may occur from crosstalk of multifrequency signalling for example do not fall in this category Single frequency tones may interfere with certain data signals particularly narrowband signals which are multiplexed onto voiceband channel 3 20 simple audio monitoring arrangement will usually detect this interference since tones exceeding acceptable levels are easily heard if the C message noise is within limits The single frequency interference check is made with the setup shown in Figure 3 5 After the received noise signal passes
461. ncy skip automatically prevents 4935A from transmitting frequencies in the 2450 Hz to 2750 Hz range This feature is used when transmitting over a dial up network with single frequency signaling units Any skipped frequency can be programmed using the STORE capability of the 4935A see Figure 3 1 3 32 MESSAGE CIRCUIT NOISE MEASUREMENTS 30 The message circuit noise measurements determine the effects of background noise and tones Figure 1 2 illustrates the basic setup for these measurements LINE MONITOR QUIET TERMINATION TELEPHONECIRCUIT m gt TRMT TIMS Figure 3 5 Message Noise Measurements 3 34 The message circuit measurement is obtained by measuring the noise present on a line with a quiet termination on one end supplied by the transmitting 4935A and a weighted measuring device on the other end receiving 4935A 2449 The C message filter measures noise signals that annoy typical telephone service subscriber C message weighting is also used to evaluate the effects of noise on voice grade data circuits C weighting is valid for data transmission since the response characteristic is relatively flat over most of the frequency range for data transmission 600 to 3000 Hz see Figure 3 6 3 36 The 3 kHz flat filter has a response that provides much less attenuation to the low frequencies 60 Hz to 500 Hz than the C message filter By comparing a 3 kHz flat noise measurement to a C message noise measu
462. ng on use and operating environment the instrument should be checked every six months using the performance tests Performance tests should also be made following repair or when internal adjustments are required 4 11 To shorten testing time the abbreviated Performance Tests may be used test results do not totally confirm that the instrument meets the published specifications Perform the full test to verify that instrument s performance completely meets specifications 4 Performance Tests Model 4935 PERFORMANCE TESTS 4 12 PERFORMANCE TESTS 4 13 Transmitter Flatness at 10 dBm SETUP COUNTER MODEL 4935A VOLTMETER X Figure 4 l Transmitter Flatness Test at 10 dBm EQUIPMENT Fluke 5200A AC Calibrator BNC to 310 adapter 15 Counter 2 BNC cables 3490A Multimetrr BNC connectors 20 dB Amp circuit shown in 600 ohm termination Figure 4 13 I BNC to banana cable 1 Connect Voltmeter to the 4935A jack as shown in Figure 4 1 2 On 4935A select POWER ot D Fa O N DISPLAY SET UP press in TRMT 6000 MEASUREMENT LEVEL FREQUENCY Set the 4935A to 1004 Hz 4 Adjust 4935 OUTPUT LEVEL until 2 435 Vrms 9 95 dBm into 600 ohms appears Voltmeter note 4935 must be terminated as shown above 0 Check 4935A transmitter at the frequencies listed in able 4 1 6 At kHz verify that the 4935A frequency when measured with the
463. not present check AC power supply and cable 8 257 Charge Circuitry Charge Inhibit Circuitry 8 258 Disconnect batteries from charger board Remove the battery cables from 5 2 3 and J4 Place 900 1000 ohm load in parallel with a voltmeter Put the power switch in STBY 2 Check the voltage at the battery jacks one terminal of each battery jack is ground J2 23 5 to 29 5 Vdc J3 29 5 to 23 5 Vdc J4 11 0 to 13 0 d For GROUND voltage readings check Fl F2 and diodes 10 CR30 and CR31 b If there is no change tn voltage between ON and STBY all jacks check the front pancl power switch and the charger inhibit circuitry For incorrect voltages or no change in voltage between ON and STBY on only onc or two jacks check the charge circuit associated with that Jack 3 Turn power switch ON and check the voltages at the following points on the AS charger board 2 9 2 J3 9V 2V J4 6V 2V For GROUND voltage readings check 1 2 and CRIO CR30 and 3 b If there is no change voltage between ON and STBY for all jacks cheek the ront pancl power switch and the charger inhibit circuitry Model 4935A 8 259 8 260 C Service For incorrect voltages or no change in voltage between ON and STBY on only onc or two jacks check the charge circuit associated with that jack Reconnect the battery cables to 5 2 5 A5J4 and remove the
464. ns CD 3 MFG CODE 02237 MFR P N FDH 6308 Delete AI3CR30 0190 0050 Diode switching 80V 200MA 2ns CD 3 MFG CODE 02237 MFR P N FDH 6308 7 9 Manual Changes Model 4935A Delete AI3CR 31 0190 0050 Diode switching 80V 200MC 2ns CD 3 MFG CODE 02237 P N FD 6308 Page 6 27 Table 6 3 Replaceable Parts Add AIR61 0757 0465 Resistor 100K 1 125W TC 0 100 CD 6 MFG CODE 24546 MFG P N C4 1 8 TO 1003 F Page 6 2 Table 6 3 Replaceable Parts Delete A 13R209 0757 0438 Resistor S I IK 1 125W CD 3 MFG CODE 24546 MFG P N C4 1 8 TO 5111 F Delete Al 3R210 0698 0085 Resistor 2 16K 1 125W ICD 1 MFG CODE 24546 P N C4 1 8 TO 2161 F Page 6 29 Table 6 3 Replaceable Parts Change A13U20 to 1826 0741 IC Op Amp low bias CD 1 1 MFG CODE 2704 P N LF351AH Delete 13057 1826 1189 IC Op Amp low bias MFG CODE 28480 P N 1826 1189 C 2 oa935 6099 A 2103 38 i je N l C M hail Z IE x Net 14 If MA Ha Sie j 32 43 2 13 LAR 132 132 H 2 4 E 3j 4 id i2 4 23 7 n 4 05 4 052 053 094 1 4 055 1 41056 5 4 057 114 58 ht al 059 c mm R 4 14 105 05 nos n 5 5 os has N d 6j 46 9 6 s E 6 9 6 lg 6 6 9 M b IB 7 a 7 iB
465. nsmit Signal Frequency Spectrum Time mS Figure 3 16 P AR Transmit Signal Envelope 140 625 390 625 640 625 890 625 1140 625 1390 625 1640 625 1890 625 2140 625 2390 625 2640 625 2890 625 3140 625 3390 625 3640 625 3890 625 Model 4935A KEY FREQUENCY A Model 4935A Operation 3 61 The P AR measurement is a single number rating of the fidelity of a voiceband channel and is a weighted measure of the total attenuation phase distortion and noise The P AR rating is derived by comparing the P AR of an ideal signal with the P AR of the output signal of the system under test The P AR measurement is most sensitive to envelope delay distortion and is also affected by noise bandwidth reduction gain ripples nonlinearities such as compression and clipping and other impairments P AR is simpler to understand than envelope delay because it is only one number instead of a curve Also P AR can be measured in loop around mode with only one instrument unlike envelope delay If the P AR signal were received entirely undistorted the P AR rating would be 100 while a circuit that causes a 10 reduction in the pea k to average ratio has a P AR rating of 80 3 62 The measurement provides little information about the nature of the fault condition in particular case However since P AR is a figure of merit for the channel it can be used as a benchmark for future reference After other measurements are made
466. odule filters noise has protective fuses and sets the line voltage as ac line power is brought into the power supply From the line module ac power goes to the transformer which provides 10 vac 9 11 for the 5 v supply and 35 33 39 vac center tapped for positive and negative 14 volt supplies 8 130 9 11 vac secondary is full wave bridge rectified and is capacitively filtered to provide 10 14 vdc unregulated to the 5 volt regulator The 35 v C T is full wave rectified and capacitively filtered to provide both 19 to 27 vdc unregulated for the 14 vdc supplies Voltages are present at the back panel and power supply whenever the units are plugged in whether the power switches are in ON or STBY 8 23 Service Model 4935A 8 131 Regulators 8 132 Separate regulator circuits are provided for 5 v and 14 v supplies The 5 v and 14 vregulators are similar in form The 14 regulator tracks the 14 v supply it resembles power amplifier with a gain of with input from the 14 regulated supply 8 135 5 REGULATOR The 5 v supply is series regulated with a pass transister mounted on the rear panel A regulator chip provides the reference voltage an error amplifier shut down circuitry and base drive for the pass transistor When the error amplifier senses that the output voltage is low it sinks current through the base of the pass transistor turning it on until the output voltage rises to an acceptable level 8 134 14 V RE
467. on for ordering information 7 62 Model 4935A Reference Designator A13R23 A13R24 AT3R25 A13R26 A13R27 A13R28 A13R29 A13R30 A13R31 A13R32 A13R33 3R34 A13R35 A13R36 A13R37 A13R38 A13R39 A13R40 13842 1384 3 A13R44 A13R45 A13R46 A13R47 13 48 A13R49 A13R50 A13R54 13855 A13R56 A13R57 A13R58 A13R60 A13R62 A13R63 A13R64 A13R65 A13R66 A13R67 A13R68 A13R69 A13R70 A13R71 A13R 2 A13R72A A13R73 A13R74 A13R75 A13R76 13677 A13R78 A13R79 A13HR80 13881 A13R82 A13R84 A13R85 A 1 3R86 A13R87 13 88 A13R89 A13R90 A13R91 A13R92 A13R93 A13R94 A13R95 A13R96 At3R97 A13R98 A13R99 A13R100 A13R102 2100 3882 0698 3153 0698 4445 0698 3152 0698 3153 0757 6360 0698 6320 0757 0416 0757 0416 0757 0416 2100 3883 0757 0442 0757 0420 0698 4480 0698 4480 0757 0424 9698 3150 0757 6360 0757 6360 0757 0420 0698 4480 0698 4480 0698 3155 0698 4475 0698 7847 0698 6360 0698 3409 0698 3453 0757 0401 0757 0438 0698 3155 0757 0199 0698 6360 0757 0317 0757 0317 0757 0442 2100 3882 0757 0442 0698 3157 0757 0444 0757 0199 0757 0420 0698 3157 0757 0420 0757 0280 0698 3150 0698 3150 0757 0274 0698 0084 2100 3881 0757 0465 0698 4530 0699 0595 0699 1078 0698 4516 0698 4158 0698 6360 0698 4158 0698 6360 0698 4490 0698 4490 0699 0566 0699 0566 0757 0280 0698 7847 0698 6360 0698 8638 069
468. ond part of this section input circuitry to A3U34A pin 9 tone bandpass and buffer circuitry the notch filter any noise filters autorange circuitry from A3U49 to the autorange select MUX impulse noise detectors and the QRMS detector P AR peak latch 8 214 The procedure is as follows The transmit monitor path is checked as an entire section If this test passes proceed to paragraphs 8 217 through 8 226 to complete the inputs from front panel through and notch filter receiver testing If it fails check for a transmitter signal at the receiver transmitinput 9 If no input is present fix the transmitter NOTE The transmitter section must be working for the receiver loop around path test to work The output must be a clean sinewave of about 1000 Hz and the loop around select MUX must function 8 43 Service Model 4935A 8 215 H the transmitter circuitry sends the proper signal to the rccciver path then trace that signal through successive circuits When a circuit output fails to have the proper signal step through tt back wards stage by stage until the problem is tsolated After the problem is fixed continue the XMIT monitor test until the proper output rom the voltage to frequeney converter is established 8 216 While tracing AC signals it is important to check not only the amplitude and frequency of the signal but also to check DC offsets in the signal Acceptable offsets depend on both the type of amplifier and the ci
469. operation only one of these ganged switches is in use at any one time Engaging or disengaging both switches simultaneously creates a non standard situation resulting in the transmitter being connected internally to the receiver only at reversing switches not through transmit monitor path 8 78 DIAL AND TEST WITH HOLD The 4935 has two hold coil circuits and a dial connector made up of two binding posts The hold coil circuits sink 23 mA between tip and ring of a wet dial up line to hold or latch the line during testing Failure to engage the hold coil circuit on a wet line indicates an condition causing the telephone switching equipment to drop the line under test The dial terminals are accessed by engaging the TRMT DIAL button in the setup section Engaging TRMT DIAL connects the DIAL posts directly to the tip and ring ofthe transmit 310 jack and to the circuit under test After dialing the number for the circuit to be tested and engaging the TRMT HOLD switch the dialed lineis connected to the 4935A by disengaging the TRMT DIAL switch The line can be transferred to the receive input by depressing the RCV HOLD switch and transferring the line using the NOR and REV switches 8 79 HOLD CIRCUIT The hold circuit sinks a constant current of 23 mA or greater under dc bias voltages of either polarity This current is maintained with 46 volts into 1700 ohms and draws less than 40 mA with 53 volts into 400 ohms
470. or 2 two wire circuits follow preceding steps 1 through 6 for the first side then l Push RCV HOLD switch Push REV switch to transfer the transmit side Push TRMT DIAL switch Use the butt in to dial up the other end After the circuit is answered push the TRMT HOLD switch to hold this circuit Release TRMT DIAL switch by pushing it again Figure 3 2 Measurements Continued Model 4935A Operation 3 10 MEASUREMENT PRINCIPLES SEEN The principles for making mcasuromcnts with the 4935A are described in the following paragraphs Included arc explanations of the measurements and the effects of certain parameters on data transmission 3 12 INPUT OUTPUT SWITCHING 3 143 The TKMT and RCV 310 jacks provide connection between 4935A and the circuit under test Pressing in the NOR button selects the transmit function for the left 310 jack right 310 jack simultaneously performs the receive function If the REV button is pressed in the opposite is true as illustrated by Figure 3 3 3 14 Pressing the two HOLD buttons allows the 4935A to simultaneously hold two DDD Direct Distance Dialing circuits Used with the NOR and REV buttons this prrmits changing the direction ofthe test signal without physically changing thr test cables and potentially dropping the circuits 3 12 The input and output impedances are the standard values of 35 600 900 ohms The 4935A impedance selected must match the impedance of the cir
471. original amplitude As greater attenuation is switched in the noise on the signal will rise 5 If a failure ts found check the latch outputs vs the values shown in the MUX Table on schematic sheet 2 of 2 If the select address is correct check amplifiers voltage dividers and input grounding analog switch 2050 6 To avoid crosstalk in A3U39 do input grounding as follows U55 input is grounded 10 to 20 dB gain U38 input is grounded 10 to 40 dB gain 8 250 Detector Troubleshooting 8 251 Check the positive side of C34 C35 or C36 There should be 29 1004 Hz transmit monitor signal not adjust the looped transmit level 2 Waveform diagrams are provided on the schematic to case troubleshooting the detector section The following hints may prove useful The output of 022 must be correct for any of the rest of the circuit work Both and 2 signals must be correct b In addition to U22 only 021 U20A and associated circuitry must function for the average detector to work C U22 U23 U24B and associated circuitry must function for the Qrms detector to work 8 252 IMPULSE NOISE CIRCUITRY 8 253 Check 10 reference voltage at A3U13 pin 15 If not the reference voltage has failed or is being loaded down N Check the impulse noise DAC as follows a Select IMPULSE NOISE and DISPLAY RCV on the front panel b Select LOW SET threshold to 0 dBrn the 10 s digit is
472. ors through 6 indicate there are problems during self check Errors 7 and 8 highlight problems during a particular measurement Other indications of errors during measurement are described by the particular measurement After startup self check the instrument automatically goes into Transmit Mode LEVEL FREQUENCY Even if error messages occur the instrument continues to operate correctly except for those measurements affected hy the displayed errors Errors 0 rough 5 Err O Err 5 followed by Error 6 Err 6 is indicative of a system level failure more than a filter failure Display ed Errors are Err 0 Test signal cannot be measured through C Message filter Err Test signal cannot be measured through 3 kHz flat filter Err 2 Test signal cannot be measured through 15 KHz flat filter Err 3 Test signal cannot be measured through Program filter Err 4 Test signal cannot he measured through 50 kBit filter Err 5 Test signal be measured through P AR filter If not a P AR unit refer to Err 0 Err 6 Error in LEVEL FREQUENCY signal path Err 7 Received 1004 Hz tone is below 16 dBm or above 13 in NOISE WITH TONE or SIGNAL NOISE Err 8 IMPULSE NOISE threshold is se too high Thr upper limit varies with the receive impedance as follows 13542 116 dBrn Upper Limit 6009 109 dBrn 9000 107 4 Brn 3 1 Operation Figure 2 3 1 CE SEES SR S S USE 5 E MOORE B X
473. paeog L EV 21 2 9613 oo n m a M Q M r o a o o 2 am 27 rrr m oom 3 ow W i r n e Ee i 100 8801190 T l i AAR 4 I Bee HOLY P Doc oe i i r ja Te 2 i 1 1 d t 1 a a ede wd i s iw a watata s H o oan R i 6 1 i T t i AS i j the i 4 4 T n 515 ore o 1 p 4 4 5 5 T i v 901 ES di ia mim 2 i 138420 su TN 3 x 1 1 oet ore Me i nak er os n i i i 520123439 35 0 3S awl i i En i WINS 41904 I
474. quipment Required 4 1 Pest RECOLG s un 4 1 ted tei 4 1 Performance Verification 4 1 Performance Tests 4 2 Transmitter Flatness at 10dBm 4 2 Transmitter Flatness at 40dBm 4 4 Receiver Accuracy at t 11dBm amp 40 4 8 Testa 4 10 FIGS Te 411 Impulse Noise DAC Test 4 14 Count Limit 4 16 Termination Impedance Test 4 17 Hold Tone Dropout Detector Test 4 19 Hold Circuit Test 4 20 Distortion 4 21 haqq 4 25 Noise to Ground Std amp Opt 001 4 26 ADJUSTMENTS CALIBRATIONS unti 5 1 Safety Considerations 5 1 Equipment Required 5 1 Instrument _ 5 1 Adjustment Locations Sel At NA 5 2 t 5V 14V and 14V Power Supply Adjustmehts en 5 3 Output Level amp Transmit Monitor Loop Adjustments 9 4 Receiver AdjJustments 5 5 Notch Filter Adjustments 5 7 Filter and Latch Adjustments Opt s 001 amp 003
475. r test identify the allowable voltage range Verify that the 20 dB amplifier output is in this range 8 Repeat Steps 3 to 5 for each frequency column of Table 4 2 20 Hz through 85 kHz Table 4 2 Transmitter Flatness at 40 dBm Vout 70 2 dB 200 Hz in mV 1 0 dB 20 Hz 0 5 dB 50 Hz amp 0 2 dB 15 kHz 0 5 dB 60 kHz 0 5 dB 85 kHz 729 to 57 9 68 9 to 614 66 5 to 63 5 68 9 to 614 68 9 1061 4 734 to 58 3 69 3 to 617 p6 9 to 63 9 69 3 to 61 7 69 3 to 61 7 73 8 to 58 6 69 7 to 621 67 3 to 64 3 697 to 62 1 69 7 to 62 1 74 3 to 59 0 70 1 to 62 5 677 to 64 7 70 1 to 62 5 70 1 to 62 5 74 7 to 59 4 70 5 to 62 9 68 2 to 65 1 70 5 to 629 70 5to 62 9 75 2 to 59 7 71 0 to 63 3 68 6 to 655 71 0 to 63 3 71 0to 63 3 75 6 to 60 1 714 to 636 69 0 to 659 71 4 to 63 6 71 40 761 to604 71 8 to 640 69 4 to 66 71 8 to 64 0 71 80 765 to 60 8 72 2 to 644 6 72 2 644 72 2 to 77 0 to 61 1 727 to 648 72 7 to 64 8 72 7 to 774 to 61 5 73 1 to 651 719 to 61 9 73 5 73 5 to 655 78 3 to 62 2 739 73 9 to 659 78 8 to 62 6 74 4 i i 74 4 to 66 3 79 2 to 62 9 74 8 to 66 7 PP Ww gt OO 79 7 to 63 3 75 2 to 67 0 80 1 to 63 6 75 6 to 67 4 80 6 to 64 0 E 76 1 to 678 81 010643 5 76 5 to 68 2 81 5 0647 76 9 68 5 81 9 to 65 1 77 3 to 68 9 i 4 7 7 to 69 3 77 7 to 69 3 8 1 5 82 4 to 65 82 8 to 65 833 to 66 83 7 to 66 5 79 0 to 704 79 0 to 70 4 79 0 to 70 4 78 2 to 697 78 2 to 69 7 786 to 70 0 78 6 to 70
476. rcuit type As estimate for amplifier circuits multiply the maximum specified input offset vollage rom the op amp specification sheet by the gain of the amplifier Example HP Part No 1820 073542507 20 dB amplifier configuration Offset voltage voltage amplification x offset spec 10 x 80 my The offset can be easily checked by switching the oscilloscope used to look at the signal from AC to DC input and looking for a jump in the position of the waveform notice able jump indicates a failure 8 217 Set Up 8 215 Set the 4935A LEVEL FREQUENCY measurement and DISPLAY TRMT display mode Press both 600 ohm impedance buttons Set the output frequency to 1004 Hz and adjust the output level to 5 dBm 5dBm 1 78 Vrms 3 90 v signal NOTE When measuring voltage at front jacks the scope must be terminated with 600 ohms If ter mination is used the voltage will be 7 8v P P If using a voltmeter with no termination the voltage will be 2 8 219 Overall Transmit Monitor 8 220 H everything ts working properly the receiver board will present pulsed signals approximately 15 kHz dv to the microprocessor and counting section on the transmitter board through the LEVC line Check A3U3 pin 7 this signal If it is present vary the transmit level with the OUTPUT LEVEL control As the output level rises the LEVC A3U3 pin 7 signal frequency should increase and VI
477. re the miscellaneous control latch A4U12 and the frequency measurement control latch A4U11 How these latches work is described in paragraph 8 38 How to Compute Level and Frequency 8 48 INSTRUMENT TO MICROPROCESSOR 8 49 The microprocessor receives inputs from many parts of the 4935A The option and miscellaneous sense latch provides microprocessor with the following information a DO reads the state of the open line during frequency measurement b D1 reads the state of the tone dropout latch C D3 and D read the receiver impedance setting from the front panel d D4 D5 and D6 read the instrument option number e 1 7 is used with the diagnostic processor from the Diagnostic Service kit to enable signature analysis routines 2 The level and frequency measurement counters see paragraph 8 38 How to Compute Level and Frequency for an explanation e The impulse noise latches see paragraph 8 69 for an explanation 8 50 The microprocessor has internal circuitry which senses power up and causes a reset Reset can also be caused grounding the processor reset line 8 51 OPERATOR TO MICROPROCESSOR 8 52 Keyboard Interrupt 8 53 The microprocessor senses operator commands through I O port 0 its own interrupt line and the keyscan interrupt circuitry The eight lines of microprocessor I O port 0 form a four by four key matrix on the front panel The four least significant bits of this port feed into NAND g
478. rement the relative influence of low frequency noise 60 Hz commercial power 20 Hz ringing etc can he determined see Figure 3 7 Operation Model 4935A Respon sedB 60 100 200 500 1000 2000 3000 5000 Frequency Hz Figure 3 6 C Message Weighting Characteristic gt wi A oc Frequency Hz Figure 3 7 3 kHz Flat Weighting Characteristic 3 20 Model 4935A Operation 3 37 The program weighted filter is designed for weighted noise measurements on program channels used primarily by thr broadcast industry to communicate between studio and transmitter site see Figure 3 3 9 The 15 kHz flat filter is also designed for measurements on program channels Like the 3 kHz flat filter 1t includes low frequency noise in the measurement see Figure 3 9 M The 50 kBit filter is designed to measure weighted noise on wide band data circuits see Figure 3 RESPONSE dB 400 1000 2000 5000 FREQUENCY Hz Figure 3 8 Program Weighted Filter RESPONSE dB 10 2 100 Hz kHz 10 kHz FREQUENCY Figure 3 9 15 kHz Flat Filter Operation Model 4935A eo 7 2 d 1 FREQUENCY Hz Figure 3 10 50 kBit Filter 3 40 NOISE MEASUREMENTS 3 4 1 Received noise levels are displayed in units of dBrn or dB with respect to reference noise 1000 Hz tone at 90 dBm For example noise reading of 20 dBrn has an RMS power of 70 dBm 20 90 70
479. riate filter or a ground input for quiet termination as the input to the power amplifier 8 121 LOOP AROUND CIRCUIT The loop around circuit provides the signal path used by the 4935A receiver to monitor the transmitted signal in the display transmit mode The circuit has two signal paths The first 1 from the power amplifier output stage through the loop adjust amp and the loop select MUX to the receiver board The second comes from the wideband low pass filter and goes directly through the MUX to JI and the receiver board This path 18 used when the output is quiet terminated and the 4935A 8 122 suppress the loop around signal the transmit line is grounded through the loop select MUX The loop select lines are the same as the output select MUX address lines With quiet termination the noise should be below 20 mv 83123 OUTPUT AMPLIFIER CIRCUIT The output power amplifier is an op amp driven complementary symmetry output stage which provides the amplification necessary for a 13 dBm output level The OUTPUT LEVEL control provides a full dynamic range of 40 dBm to 13 dBm The display blanks toa sign to indicate the signal level is too high overrange When generating P AR waveform the P AR signal crest factor causes the output to overrange at 3 dBm 8 124 TRANSMIT IMPEDANCE HOLD DIAL OUTPUT ROUTING The output amplifier circuit drives a transformer with balanced outputs at each of the 3impedances The proper transmit
480. rom the rest of the unit removing the 5 14 and 14 Jumpers AC voltages are present whenever the unit is plugged in whether the power switch is in ON SIBY 3 Plug in the unit Check the power supply voltages 15 120 to 414 0 v 11 23 5 to 29 5 v C5 23 5 to 29 5 If alt voltages are out of range check the AC line module and the transformer If only 1 or 2 voltages are out of range check the appropriate rectifiers and filters If the blows as the unit is plugged in disable the Over Voltage Protection circuit OVP To disable the OVP desolder and remove the triac CR24 CAUTION Always isolate the power supply from the instrument whenever the overvoltage protec is disabled Isolate by pulling JU 5 JU 14 and JU 14 jumpers NOTE Tripping the OVP shorts only the 14 unregulated line Avoid shorting the regulated outputs bricf shorts cause no damage 4 Once the voltages are correct check the protection circuitry Jumper A4J2pini to 10 to enable the 5v regulator If the fuse blows check the 5 overvollage sense circuit CR25 for 5v supply or CR23 for 14v supply b Cheek A4JU 5 for 5v 20my If correct go to Step 5 it 15 not correct try to adjust the supply One or two tweaks of the correct pot should bring the supply within range If not then there are problems which must be found before troubleshooling any other parts of the 4935A I If Ul4 pi
481. rough the input transformer Notch filter in 20 dB amp switched in when input signal is less than 5 mVRMS Autorange switched in Noise filter selected on front panel QRMS detector selected 8 4 Model 4935A Service 8 19 Signal To Noise 8 2 DISPLAY TRMT Transmitter synthesizes a 1004 Hz sinewave whose level is set by the front panel OUTPUT LEVEL control The wideband low pass filter is selected and the loop around path monitors the power amplifier output 8 21 DISPLAY RCV The 4935 measures signal to noise ratio of the signal input to front panel RCV 1004 Hzis assumed The level of the entire input signal 1004 Hz plus noise is measured through average detector Second the 1004 Hz signal is notched out and the remaining noise measured with the QRMS detector through the noise filter selected Finally the microprocessor calculates the signal to noise ratio on the right display The receiver path is as follows Balanced input through input transformer Notch filter in 25 dB amp switched in when input signal is less than 5 mVRMS Autorange switched in Noise filter selected and displayed on front panel QRMS or AVG detector selected as needed RMS for noise measurements for hold tone to measure signal level Microprocessor computes level 8 22 Impulse Noise 8 23 DISPLAY TRMT The transmitter synthesizes a 1004 Hz sinewave For the C message and 3 kHz flat filters the output level is set by adjusting t
482. s the 4935A through system latches System latch data comes on the data bus from the processor I O The latch strobes are activated by the chip enable decoder via I O port 4 Strobes for the latches are provided by the chip enable decoder A4U7 from inputs supplied by the microprocessor through output port 4 There are six system latches 1 The phase step latches A4U26 A4U30 control the transmitter output frequency They provide select lines for the output waveform and transmit monitor multiplexers M The input select latch A3U7 controls the set up of the input circuitry through analog switches It selects the input source balanced input noise to ground or transmit monitor determines switching in or out of notch filter and selects switching in or out of 25 dB amp 3 The filter select latch A3U11 controls the filter select MUX which determines which filter 18 selected 4 The autorange latch 017 sets the autorange circuit gain through autorange multiplexer A3U39 and analog switch U50 Service 8 12 Model 4935A The detector select latch A3U8 selects which detector to use for level measurements It is also used by the diagnostic processor to check the impulse noise detector s digital to analog converter The impulse noise DAC latch A3U6 sets the comparison thresholds for impulse noise measurements 8 47 There are two additional latches used in the level and frequency measurement process They a
483. t there is level problem A3U1 2 latch A3US8 chip cnable microprocessor or data bus problem gt Check the input of A3UI3 pin 5 2 5vDC level If a DC level is present MUX has failed 6 Detectors have failed Go to the Detector Troubleshooting Section paragraph 8 250 The above tests complete the transmit monitor tests All transmit monitor tests must pass before going on to the tests below INPUTS FROM FRONT PANEL NOTCH FILTER 25dB amp TONE DROPOUT SIG NAL PATH 8 47 Service Model 4935A 8 233 SET UP 8 234 Set up the 4935A in LEVEL FREQUENCY mode transmit signal to 1004 Hz at 5 dBm and DISPLA Y RCV mode Set both impedances in to 600 ohms all other SETUP buttons out U7 removed and DIP switch HP 3101 2059 in JU3 per service selection of input circuits paragraph 8 267 Loop the 4935A output signal externally and select DISPLAY RCV 2 Refer to Schematic set DIP switch to 1 16 open 2 15 open 3 14 open 4 13 closed NOTE TPI4 should have 3 9v signal 3 The DIP switch provides a balanced input to the receiver with the notch filter out and the 25 dB amp out 8 235 Input Transformer 8 236 Look for a signal at the transformer output TP11 If the signal is good go to paragraph 8 239 If no signal 15 present remove the receiver input cable and feed the transmitter output directly into the input transformer through pins 3 and 6 of A3J4 If now has a sign
484. t level 16 After an interval 70 msec the microprocessor stops the counting by writing a 1 to the inhibit line of counter no 1 This count is proportional to the level of the input signal 3 10 Model 4935A Service 8 42 CONTROL THEORY OF OPERATION FROM TO FRONT PANEL KEY MATRIX 4 KEYSCAN AND TO SWITCH BOARD INTERRUPT CIRCUIT 8 DATA BUS TO VARIOUS TO VARIOUS LATCHING MENE u IMPULSE NOISE INTERRUPT THE IMP NOISE IMPNM ____ LATCHING AND 5 ADOR DE 4 DAC DISPLAY DRIVING 4 P emm o co eme eo o o u RATE LIMITING MUTET MISC CONTROL 2 4 ADOR LATCHES BUFFERS _FROM VARIOUS EUFFER 13 5 INPUT BUFF DROPOUT OROPOUT O IN UFFER DETECTOR LATCH 262 KHZ FROM TRANSMITTER ASSY COUNTER TO SQUARING FF TO INPUT BUFFER TONE FREQ ERE SELECT MUX SQUARED AVE FREQUENCY oe SCHMITT SIONAL LEVEL FREQ COUNTER ARNG TRIGGER SELECT MUX NO ENG Figure 8 5 Control Circuitry Block Diagram 8 43 The center of the control circuitry is the microprocessor It has 4K bytes of onboard ROM 128 bytes of RAM a built in clock circuit four 8 bit bidirectional I O ports and interrupt and timer functions There are six major flows of information between the operator the microprocessor and the rest of the instrument 8 44 MICROPROCESSOR TO INSTRUMENT 8 45 System Latches 8 46 The microprocessor control
485. t notch filter 25 dB amp Noise filter d Autorange amplifier e Level detectors f Impulse noise detectors Li SPL AY STBY iC EO _ m _ANNUN STBY AM T DISPLAY MADE AO E DISPLAY DRIVERS LM 2 ANNUNCIATORS sao FRONT PANEL A4 TRANSMITTER A2 BOARD SWITCH BOARD TCH MATRIX P O FRONT PANEL FROM INTERRUPT CIRCUITRY 3 FROM A34 AUTORANGE OUTPUT ARNG CONTROL aa 5 RECEIVER 3 0 JACK 4 INPUT TRANSFORMER up aes RCV SELECT INPUT NORM REV SWITCHES 2 6 OUTPUT TRANSFORMER TRMT IMPEDANCE _ TEST TO DIAL BIND STS E NDING POS ae Figure 8 7 Switchboard Block Diagram 8 15 Service Model 4935A 8 76 1 Switching Hold Circuits Termination TRANSMIT RECEIVE DIAL JACKS TRMT TRMT IMPEDANCE SELECT e HOLD TRMT FROM TRMT TRMT OUTPUT XFMR TO RCVR Q HOLD RCV NZ RCV BRIDGE O O O NOISE TO GND RCV IMPEDANCE RCV IMPEDANCE SELECT Figure 8 8 Input Output Switching 8 77 INPUT OUTPUT SWITCHING 4935 and telephone line to be tested are connected through the 310 jacks as shown in Figure 8 8 The NOR and REV buttons select switches select either thetransmit or the receive function for the left 310 connectors and the other function for theright 310 jack In normal
486. ter impedance is set from the front panel TRMT impedance set up switches 8 125 If selected a transmit hold circuit is connected across the transmit output lines This hold circuit is similar to the receiver hold circuit for an explanation of the hold circuit and the dial terminals see the receiver theory of operation Transmit dial and hold circuits are selected by the front panel TRMT set up switches Finally the transmitter signal 15 routed to whichever front panel 310 jack is selected by the front panel NOR and REV switches 8 22 Model 4935A Service 8 126 POWER SUPPLY THEORY 8 127 4935A power supply is powered by ac lines or rechargeable batteries Option 001 or 003 The power supplies provide 5 v at t600 mA and 14 v at 200 mA to the rest of the instrument There are 3 major functional sections of the power supply 1 The power line supplies 2 The regulator sections 42 overvoltage protection circuitry JU 5 REGULATED 5 SENSE 1 5 RECTIFIER AND FILTER AC LINF VULT IN INE 6 TRANS MOD E D 14 RECTIFIER AND FILTER r REGULATOR INVERTING Bie REGULATED 14 OVP SENSE 14 LINE 14 SUPPLY 3 i6 42 REAR PANEL XMIT 80 Figure 8 13 Power Supply Block Diagram 8 128 AC Line Supplies 8 129 The line m
487. th the symbol for a capacitor the distance between the horizontal as drawn here lines should be at least equal to the length of those lines IEC 117 3 symbol No 215 21 In addition the following describes the use of Warnings Cautions and Notes used in HP Automatic Test System Manuals Wamings cautions and notes Warnings and cautions shall precede the text to which each apples but notes may precede or follow applicable text depending on the material to be highlighted Warnings cautions and notes shall not contain procedural steps nor shall they be numbered When a warning caution or note consists Of two or more paragraphs the heading WARNING CAUTION NOTE shall not be repeated above each paragraph If it is ever necessary to precede a paragraph by both a warning and a note ora caution and a note etc they shall appear n the sequence as noted namely warnings cautions notes Such inserts In the text shall be short and concise and be used to emphasize important and critical instructions An operating procedure practice etc which if not correctly followed could result personal injury or loss of life CAUTION An operating procedure practice etc which if not strictly observed could result in damage to or destruction of equipment NOTE An operating procedure condition etc which it is essential to highlight 4ealth hazards precaution data When hazardous chemicals or adverse health factors
488. the exception of the Receiver Boards all instruments with Serial Prefix 2305A follow the Component Locator and Schematics in the 4935A Operating and Service Manual with the Print Date OCT 1982 and the modifications defined in Change 8 of this Manual Change Section The Receiver Boards for both standard 04935 60004 and Option 001 04935 60006 units are the same as Receiver Boards with the 2208A Serial Prefix CHANGE 10 NOTE See Service Note 4935A 9 prior to replacing any of the parts below Page 6 19 Table 6 3 Replaceable Parts Change A4R80 to 0757 0428 RESISTOR 1 62K 1 125 CD 1 Mfr Code 02995 Mfr P N MF4C 1 Change A4R81 to 0757 0431 RESISTOR 243K 1 125W CD 6 Mfr Code 02995 Mfr P N MF4C 1 Change A4R97 to 0698 3150 RESISTOR 2 37K 1 125W CD 0 Mfr Code 02995 Mfr P N MF4C 1 Change A4R98 to 0757 0280 RESISTOR 1K 1 1257 CD 3 Mfr Code 02273 Mfr P N 993 Page 6 33 Table 6 3 Replaceable Parts Change A14R80 to 0757 0428 RESISTOR 1 62K 1 125W CD 1 Mfr Code 02995 Mfr P N MF4C 1 Change A14R81 to 0757 0431 RESISTOR 2 43K 1 1257 CD 6 Mfr Code 02995 Mfr P N MF4C 1 Change A14R97 to 0698 3150 RESISTOR 2 37K 1 125W CD 0 Mfr Code 02995 Mfr P N 4 Change 14 98 to 0757 0280 RESISTOR 1K 1 125W CD 3 Mfr Code 02278 Mfr P N CEA 993 Page 8 75 Figure 8 34 A4 Transmitter Board Schematic Diagram Sheet 2 of 2 Change the values ofthe following resistors located in the Output
489. the principle used in the 4935 A series of binary numbers in ROM represents a sinewave or waveform when P AR measurement is selected The instrument scans the ROM and converts the numbers to voltage levels filters out the high frequency distortion components and amplifies theresulting waveform to provide the desired test signal 8 108 FREQUENCY The frequency of the sinewave depends the rate at which the voltage numbers are changed and the number of steps needed to complete the waveform In the 4935A the rate at which the voltages are changed the transmit clock frequency is constant at 22 or 1048576 times per second The frequency of the waveform is varied by changing the size of the steps through the ROM 8 109 Assume that the ROM has 2 or 1048576 locations The address counter used to scan the ROM has 20 stages and can count to 27 By incrementing the address counter by oneateach clock cycle it will take 2 to scan through the ROM and to produce a single cycle of sinewave Since the voltage change rate the transmit clock rate is 2 times per second a 1 Hz sinewave is produced The address counter is incremented by 2 each transmit clock cycle In one second the ROM is scanned twice producing a 2 Hz sinewave Increment the address counter by some number N each transmit clock cycle In one second the ROM is scanned N times producing an N Hz sinewave 8 20 Model 4935A Service 8 110 The 4935A ROM has 2 1024 loc
490. to receiver board at receiver board Remove 6 screws holding receiver board to receiver board shield plate Lift receiver board and set it aside Lift receiver board shield with battery pack and charger board attached Disconnect W6 if battery option and set shield battery pack charger board aside To remove battery pack a Disconnect cables W7 W8 W9 from charger board b Remove 4 screws holding battery pack to shield board Batteries will lift off shield board remove charger board a Remove 3 screws holding board to shield Board will lift off 8 29 Service 8 30 Model 4935A 8 173 SWITCH BOARD FRONT PANEL REMOVAL 8 174 1 8 175 8 176 Disconnect W3 the cable running from the receiver board to the switch board at the receiver board Disconneet W5 the monitor amp cable from the receiver board Press down gently on the output transformer on the transmitter board near the switch board connector and pull up the switch board front panel assembly Assembly should slide up and out of its retaining grooves CAUTION the switch board and front panel do not remain parallel while being separated the monitor volume potentiometer shaft can bind in its hole in the front panel and break the potentiometer ease or bend the shaft To remove the front panel from the switch board remove the output level and monitor volume knobs and the hex nuts from the TRMT and RCV jacks and output level adjust
491. transmitter board and reconnect Keep the cable away from the handle mounting notches in the case to avoid pinching the cable and locking the handle into fixed position 9 Reconnect W2 and W3 and insert the four small plastic standoffs 10 Gently put on case top CAUTION To avoid damage to the front panel when replacing the case top remove 3 screws fasten ing the shicld plate to the back panel and slide do not force the case top into the guides 11 Replace 3 screws on rear pancl 12 Replace 4 screws on case bottom 8 31 Service Model 4935A FIX POWER SUPPLY CHECK POWER SUPPLY ESPECIALLY 5V CHECK 4P MIN CORE DISPLAY AND FIX IT PASSES ONE OR MORE OF 0 6 BUT NOT ALL CHECK APPROPRIATE FILTER PATH GO TO PERFORMANCE CHECKS TO FIND PROBLEMS MANY FAIL CODES 14V SUPPLIES GOOD FIX SUPPLIES 15 THE TRANSMITTER GOOD FIX TRANSMITTER IS LOOP AROUND FiX LOOP AROUND PATH GOOD CKT ON RCV TO CARRY BOARD INPUTS FIX COUNTING CKT BOARD USING uP SA Figure 8 17 Instrument Troubleshooting 8 32 Model 493 SA 8 179 8 180 Service POWER SUPPLY TROUBLESHOOTING Isolate the AC line supplics from the regulators by removing 3 jumpers from A4J2 in non battery units Disconnect the cable from the charger board to the transmitter board in battery units 1 2 Disconnect the power supply f
492. try CR7 R4 R16 R94 R95 R96 Q2 and Q7 b Any ripple on 14 v supply will appear on the 14 v supply even though the 14 v supply is operating properly When troubleshooting this regulator think of it as an OP AMP DRIVEN DC POWER AMPLIFIER with drive only in the negative direction which uses the 14 v supply as its input NOTE CR4 helps U1 provide sufficient drive for Q1 When replacing U1 check CR4 and also replace if needed and CRI insure that U1 has a power supply range of less than 35 volt Vcc to Vec 8 181 MINIMUM CORE TROUBLESHOOTING 8 182 The power supply and a minimum core of the instrument must function to test or troubleshoot Components which must be working for the core to function are a microprocessor A4U6 b chip enable Decoder A4U7 c display Driver chips A2U2 A2U3 d data bus from the microprocessor 00 07 of I O 1 of the microprocessor e microprocessor to chip enable decoder lines A4 A7 of I O 4 of the microprocessor f mode control line AO of I O 4 of the microprocessor 8 34 Model 4935A Service DISP and ANUN STROBES from Chip Enable Decoder A4U7 to the Display driver chips A2U2 and A2U3 The lines in d f and above run through the edge connector between the transmitter and display boards 8 183 Procedure 5 184 l Remove the microprocessor from its socket power up the 4935A and check for the appropriate voltages on the following pins d
493. ual or in Table 7 1 it may be documented in a yellow MANUAL CHANGE SHEET supplement Table 7 1 Manual Changes Instrument Changes Assembly Changes Instrument Make Instrument Make Serial No Changes Design Description Serial No Changes A2 Switchboard 2204A A5 Battery Charger A4 Transmitter A3 Receiver 7 6 MANUAL CHANGE INSTRUCTIONS CHANGE 1 Page 6 9 Table 6 3 Replaceable Parts A2 Switchboard Add A2J5 HP Part No 1251 5063 CONNECTOR Change A2 to HP Part No 04935 60002 SWITCH BOARD all units Mfr Code 28480 Mfr Part No 04935 60002 Change A2J2 to HP Part No 1251 5063 CONNECTOR PIN Page 6 10 Table 6 3 Replaceable Parts A2 Switchboard Change A2TP3 to HP Part 0360 0124 TEST PIN Change A2TP4 to HP Part 0360 0124 TEST PIN Manual Changes Model 4935 CHANGE 1 Cont d Page 6 20 Table 6 3 Replaceable Parts A14 Transmitter Board Add HP Part No 1251 5063 CONNECTOR Page 6 21 Table 6 3 Replaceable Parts A5 Charger Board Add ASCRI3 HP Part No 1901 0050 DIODE SWITCHING Delete A5Q8 HP Part No 1853 0036 TRANSISTOR PNP Delete ASR40 HP Part No 0757 0280 RESISTOR IK Page 6 34 Table 6 3 Replaceable Parts A14 Transmitter Board Add HP Part No 1251 5063 CONNECTOR Page 6 35 Table 6 3 Replaceable Parts A14 Transmitter Board Add Al4W4 HP Part No 04935 60010 SHIELDED CABLE Change 14 to HP Part No 04935 60010 WIRE Page 8 7
494. uble pole double throw double pole single throw drive driver display drode transistor logic emitter emitter coupled logic electrolytic encapsulated external extractor female farads flip flop film front fixed giga 107 germanium glass ground ed General Purpose gray green henries hardware hexagon hexagonal SIX high pass hour s Hertz Integrated circuit inside diameter intermediate frequency inch inches Incandescent inctude s insulation Insulated Internal Internal Reference Designations and Abbreviations 1 of 2 Model 4935A Integrated circuit non repairable assembly vacuum tube photocell etc voltage regulator lumper wire cable assembly socket crystal tuned Cavity network kilo 10 kilohm K LED light emitting diode LFT left LG long LH left hand LKWR lockwasher LP low pass LS low power Schottky LSB least significant bit M milli 1073 male mega 1 0 megohm MET FLM metal film MET OX metal oxide MHZ megahertz M manufacturer MINTR minaature MISC miscellaneous M momentary MOS metal oxide semiconductor MSB most significant bit MTCHD matched MTG mounting MTLC metallic N nano 109 normally closed connection NE lt neon NO number normally open NP No Polarity NPN negative positive negative NPO negative positive zero zero temperature coeffici
495. ument model number serial number and a description and function of the part Address the order to the nearest Hewlett Packard Office 6 1 Replaceable Parts C CATH CCW CD PL CER CERMET CKTS C FLM CLK CLR CMOS COM COML COMP COMPL COND CONN CONT CPRSN CTL complementary IN INCAND INCL INSUL diameter INT direct current clockwise Table 6 1 REFERENCE assembly motor synchro fan binding post battery m capacitor breaker diode delay line K L M 0 P Q R R indicator display Mise electrical parts fuse 4 UJ filter U receptacle connector jack amperes alternating current address adjust adjustment aluminum as required algorithmic state machine assembly base binary coded decimal beryllium copper binary black blue band pass brown brass British thermal unit collector cathode counterclockwise cadmium plate ceramic ceramic met fim Circuits carbon film clock clear complementary metal H Oxide semiconductor logic common commercial HP composition HR complete HZ conductor connector IC contact ID compression IF transistor logic depos ted carbon HDW HEX INTL DESIGNATIONS jumper relay inductor meter optical encoder plug connector transistor resistor thermistor switch transformer terminal board test point diameter dual in line package do
496. unit on under battery power Check 14 supply Shut down by momentarily grounding 2 sec ASUI pin 5 The unit should shut down Wait 2 sec and cycle power switch to turn unit on under battery power Check 14V supply low voltage shutdown by momentarily 2 sec grounding ASUI pin 6 Unit should shut down Wait 2 seconds and cycle the power switch to turn unit on under battery power Check 5 supply low voltage shutdown by momentarily 2 sec shorting ASUI pins 7 and 9 Wait 2 seconds and cycle the power switch to turn unit on under battery power The instrument self check check has been completed connect the unit to an AC power source and the 4935A will usually reset do a self check Wait 2 seconds and disconnect the AC power source The 4935A should shut down If any of these tests go to paragraph 8 265 the unit passed all tests to this point the charger board ts functioning properly and the following tests are not necessary to perform Delay And Relay Drive Circuitry NOTE Batteries must be fully charged for this test to be applicable sec paragraph 8 258 Connect 4935A to AC power source and turn Without turning the 4935A off disconnect the unit from AC power Model 4935A 8 265 8 266 6 Service Short ASC3 with a jumper to disable the AC power and the low voltage inhibit circuitry Momentarily short the collector and emitter of 5092 The relay should click and unit should tur
497. ure 4 4 Autorange Test EQUIPMENT Fluke 5200 AC Calibrator 1 banana plug test cable I BNC to banana adapter Connect equipment as shown in Figure 4 4 4935 select POWER d SS etd ate a ictu tia Cere ON DISPLAY tag esent teo died dat Urt ws RCV SETUP press 6000 MEASUREMENT LEVEL FREQUENCY 2 Set the AC Calibrator to 1000 Hz 2 For each voltage and range in Table 4 6 check that display is within acceptable limits Table 4 6 Autorange Test AC CALIBRATOR VOLTAGE DISPLAY 86911 V 0 910 11 086911 191 to 189 0086911 V 39 2 to 38 8 00086911 V 59410 586 2 7484 V 10 9 to 11 1 0 27484 V 91 to 89 0 027484 V 29 2 to 28 8 0 0027484 V 49 4 to 48 6 ABBREVIATED AUTORANGE TEST There is no abbreviated Autorange Test 4 10 Model 4935A Performance Tests PERFORMANCE TESTS 4 17 Filter Tests SETUP AC CALIBRATOR MODEL 4935A Figure 4 5 Filter Tests EQUIPMENT Fluke 5200A AC Calibrator I BNC to dual banana test cable I BNC to 310 adapter GENERAL PROCEDURE l Connect equipment as shown in Figure 4 5 2 Set AC Calibrator to 775 V 0 0 dBm across 600 ohms 3 On 4935A select POM ELZ terr a LTD Seok Ob eae Ae dt ine es DISPLAY CA 5 hog de rh en Re de SS RCV EDIS iine See a d RCV 6000 MEASUREMENT sors
498. uring a specified time period a TRANSMITTED HOLDING TONE uJ gt lt b RECEIVED HOLDING TONE WITH IMPULSE NOISE SPIKES Figure 3 13 Impulse Noise Waveform Representation Model 4935A Operation 3 55 NOISE TO GROUND MEASUREMENT 3 56 The 4935 uses noise to ground to measure the longitudinal noise present on a telephone circuit with reference to ground The transmitting 4935A provides a quiet termination at one end of the voice channel and the receiving 4935A provides a frequency weighted filter and detector at the other end The basic measurement technique used for the noise to ground measurement is very similar to the message circuit noise measurement the main difference lies in the use of a ground reference 3 14 illustrates this difference mw MESSAGE CIRCUIT NOISE Y gt QUE T TO FILTER TERMINATION AND TIMS TIMS NOISE TO GND TO FILTER AND DETECTOR Figure 3 14 Noise to Ground Related to Message Circuit Noise 3 57 N oise to ground measurements are usually made for troubleshooting purposes to measure the magnitude of longitudinal signals which may indicate the susceptibility of a cable pair to electrical coupling from external sources These measurements are also made to coordinate new installations with power companies to minimize power line coupling 3 58
499. vice Model 4935A 8 The microprocessor monitors the output of the 2nd most significant bit of counter 2 until it senses that this counter is 1 4th full of transitions of the 262 kHz clock approximately 60 msec It monitors the 15th bit of the counter by writing 1110 to the counter inputs ABCD and detects the change from 0 to 1 by reading the counter output 9 After microprocessor senses the 1 4th full condition it clears the Begin command 10 The next positive transition of the frquency waveform clears the Open line and stops the waveform from being gated to the counters 11 microprocessor monitors the not open signal through pin 2 of tri state buffer 013 When it detects that the Open line has cleared it inhibits the counters by writing a 1 to Port 5 Bit 3 12 LEVEL counts are routed to the counter by writing a 0 to Q3 of register U12 The microprocessor stores the number of counts from counter no 1 and the number of 262 kHz pulses from counter no 2 for later use in computing the frequency of the input signal The microprocessor next measures the level of theinput signal by measuring the frequency ofthe V to F converter from the detector circuit as follows 13 The counters are reset by microprocessor 14 The inhibit command to the counters starts counter no 1 counting pulses 15 Counters accumulate frequency counts at a rate proportional to the inpu

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