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Service Manual

1. 1 3 4 5 6 7 8 9 10 12 13 14 15 16 17 R416 D474 A5 115 e PO TE 3V3D 5 816 28F 400 TP488 AM29LV800B imis en eem epe e i ipia E al A ROM A16 48 aig L481 T ADC CHANNEL A 1 A5 ptr
2. 2 3 4 5 6 7 8 9 10 T 12 13 14 15 16 l LINEAR SUPPLY i E FLYBACK CONVERTER O AED DLE BC869 VBAT R580 0 33E Y ART L569 d MBRS340 as TAS TP561 BL wm 14 813 3V3SADC o C568 VGARVAL 4 314 BS Pens e 150u a u u ne TP568 For PCB versions lt 8 only TP572 12VPROG S A L562 BATIDENT LUSI 191 E 4 D16 47uH SVA_ 1 810 2 810 PE TA 1 30VD L0581 V561 C572 TP573 SEM 1 591 ka m iem BATTERY PACK C51 cu Y T10u een MBRS3AG L563 150u o Seu A r ion 2n lt a 47uH 3V3D 4 413 4 88 X503 0 ka 4 F1 BP120 R went 0 Ohm T L C512 T552 2 v562 ti C561 C573 TP574 1 1 LNG R512 100 C548 4 150 L564 150 r 1 n MBRS340 150u T1500 1 5 NC 2K87 22n 5 68uH 3V3A 1 1 810 2 410 1 14 C955 PL nd 3 F1 4 413 H T S i R59 C547 3900 8 V563 L C562 tj C874 TP576 k k 1 t r2 t E 22 HE V551 al MBRS340 150u L566 150u
3. N El IN m a Lo ui R261 TRep ETE R257 R258 E 242 o5 LO N C291
4. ST8136 0 WMF ST8136 0 00 01 12 Figure 9 8 Main PCA side 2 PCB version lt 8 4 1 9 a x o e iD 10 Y E x eo TP495 I C314 C183 TPO C187 P310 O Om TP321 C399 Circuit Diagrams 9 2 Schematic Diagrams 5 9 14 E e 5 9 1 TP593 e TP451 TP59 e TP574 reser P528 Y cso BI e 9 le TP576 O ro 64 C572 TP307 TP258 TP495 496 TP152 156 TP310 331 332 336 338 TP431 432 436 437 438 482 483 TP 572 TP253 TP401 451 471 474 476 TP 526 534 536 537 561 591 TP306 307 TP503 522 527 531 571 TP151 TP251 254 255 256 TP301 304 308 309 311 321 322 O 17577 pana 4022 245 0443 8 T8135 2 00 01 12 603 TP600 605 TP528 551 552 574 576 592 593 TP501 502 504 529 577 ST8135 2 WMF Figure 9 9 Main PCA side 1 PCB version 8 9 15 123 Service Manual 4 Y Fu ST8136 2 WMF Figure 9 10 Main PCA side 2 PCB version 8 6 1 9 Chapter 10 Modifications 10 1 Software modifications se 10 1 10 2 Hardware modifications concoconononoccconononanananancconononann on iiaia rE nnne eren 10 1 Modifications 1 0 10 1 Software modifications 10 1 Software modifications Changes and improvements made to the test tool
5. iod SAMPLES SWEEP 1 di t 14 SAMPLES SWEEP 2 PIXEL BR EN 123 45678 9 10 1 2 13 14 15 16 Figure 3 11 Random Repetitive Sampling Mode Circuit Descriptions 3 3 3 Detailed Circuit Descriptions DACTEST output A frequency detector in the T ASIC monitors the ALLTRIG signal frequency If the frequency is too high to obtain a reliable transmission to the D ASIC the DACTEST output pin 29 will become high The DACTEST signal is read by the D ASIC via the slow ADC on the Power part It and indicates that the D ASIC cannot use the ALLTRIG signal e g for qualified triggering Current Source A current source in the T ASIC supplies a DC current to the GENOUT output pin 1 The current is used for resistance and capacitance measurements It is adjustable in decades between 50 nA and 500 uA depending on the measurement range and is derived from an external reference current This reference current is supplied by the REFP reference voltage via R323 and R324 to input REFOHMIN pin 6 The SENSE input signal is the buffered voltage on Input A For capacitance measurements it is supplied to a clamp circuit in the T ASIC pin 59 The clamp circuit limits the positive voltage on the unknown capacitance to 0 45V The protection circuit prevents the T ASIC from being damaged by a voltage applied to Input A during resistance or capacitance measurements If a voltage is applied a current will f
6. ST8129 CGM Figure 4 6 Test Tool Input A B to 5500A Normal Output for gt 300V 2 Select the following test tool setup e Press to select auto ranging AUTO in top of display Do not press anymore e Press Ea to open the INPUT A MEASUREMENTS menu and choose MEASURE on A W VAC e Press NE to open the INPUT A MEASUREMENTS menu and choose MEASURE on A B VDC VDC becomes main reading VAC secondary reading e Press YA to open the INPUT B MEASUREMENTS menu and choose INPUT B M ON MEASURE on B W VAC e Press TRER to open the INPUT B MEASUREMENTS menu and choose INPUT B M ON MEASURE on B W VDC e Move the Input A and Input B ground level indicated by zero icon WN to the center grid line Proceed as follows Press to enable the arrow keys for moving the Input A ground level Press to enable the arrow keys for moving the Input B ground level Using the DC keys move the ground level 4 19 123 Service Manual 3 Using Gj EN set the Input A and B sensitivity to the first test point in Table 4 7 The corresponding range is shown in the second column of the table 4 Set the 5500A to source the required AC voltage NORMAL output WAVE sine Observe the Input A and B main reading V DC and secondary reading V AC and check to see if it is within the range shown under the appropriate column 6 Continue through the test points When you are finished set the 5500A to Standby
7. O 1P577 TP501 TP504 ee O 55568 TP502 rrsos pe TP601 603 156 TP487 TP310 331 332 336 338 TP573 TP431 432 436 437 438 482 483 486 TP600 605 TP251 254 255 256 TP253 TP528 551 552 574 576 592 593 304 308 309 311 321 322 TP401 451 471 474 476 TP 526 534 536 537 561 591 D gt TP521 TP306 307 TP503 522 527 531 571 TP501 502 504 529 568 577 ST8135 WMF Figure 9 7 Main PCA side 1 PCB version 8 9 13 123 Service Manual can be present
8. esessseeeee ener 5 7 5 4 5500A Scope Output to Input A eene ener enne 5 9 5 5 5500A Scope Output to Input B nennen eene 5 11 5 6 Volt Gain Calibration Input Connections lt 300V sese 5 12 5 7 Volt Gain Calibration Input Connections 3500 eee ee eee 5 13 123 Service Manual 5 8 Four wire Ohms calibration connections sees ee eee eee 5 14 5 9 Capacitance Gain Calibration Input Connections sese ee eee ee eee eee 5 15 5 10 20 V Supply Cable for Calibration essen 5 16 6 1 Fluke 123 T 1 21 neret ennt ennt erre iek 6 4 6 2 Flex Cable Gonn ctors eite alie eir tee Het eire e e Mtas 6 5 6 3 Main PCA Unit Assembly a ae eene enne ener enne nennen 6 7 6 4 Mounting the display shielding bracket sss 6 9 6 5 Battery pack installation sess 6 9 7 1 Operative Test Tool without Case eene enne 7 3 7 2 20V Supply Cable for Loading Software sse 7 17 8 l Fluke 123 Final Assembly eee 8 5 RO Man PEA UDIN o eost di metuere d alte en ie 8 6 9 1 Circuit Diagram 1 Channel A Creuse sese 9 7 9 2 Circuit Diagram 2 Channel B Circuit eee 9 8 9 3 Circuit Diagram 3 Trigger Circuit 9 9 9 4 Circuit Diagram 4 Digital Circuit 9 10 9 5 Circuit Diagram 4 cont Digital Circuit Keyboard sss 9 11 9 6 Circuit Diagram 5 Power CII 9 12 9 7 Man PCA side uus menie rete P reg ble Fees ee REL keene ep Reus 9 13 9 87 Main PEA Sd Dc tdi
9. BACKLIGHT TRANSFORMER PT73458 SMD TRANSFORMER 678XN 1081 TOK PNP NPN TR PAIR BCV65 PNP NPN TR PAIR BCV65 PNP NPN TR PAIR BCV65 PREC VOLT REF LM4041CIM 1 2 PREC VOLT REF LM4041CIM 1 2 3X VOLT REG DIODE BZD27 C7V5 PEL VOLT REG DIODE BZD27 C7V5 PEL LF TRANSISTOR BC858C PEL LF TRANSISTOR BC868 PEL LF TRANSISTOR BC868 PEL LF TRANSISTOR BC848C PEL 5322 117 12466 5322 117 12469 4822 117 11373 4822 117 11373 4822 117 10837 4822 117 10837 4822 117 10837 4822 117 10837 5322 117 11725 5322 117 12452 5322 117 12469 4822 117 10833 4822 117 10837 4822 117 11154 4022 301 22071 4022 301 22021 5322 146 10447 5322 146 10634 5322 130 10762 5322 130 10762 5322 130 10762 5322 209 14852 4022 304 10571 4822 130 82522 4822 130 82522 4822 130 42513 5322 130 61569 5322 130 61569 5322 130 42136 2X4 pin DIL Transistor shape Ordering Code List of Replaceable Parts 8 5 Main PCA Parts Remarks Reference Description Designator V401 V402 V403 V471 V482 V495 V501 V503 V504 V506 V550 V551 V554 V555 V561 V562 V563 V564 V565 V566 V567 V569 V600 V601 V602 V603 V604 V605 X452 X453 X501 X503 N CHAN FET BSN20 PEL P CHAN MOSFET BSS84 PEL N CHAN FET BSN20 PEL SCHOTTKY DIODE BAS85 SCHOTTKY DIODE BAT54S PEL P CHAN MOSFET BSS84 PEL SCHOTTKY DIODE MBRS340T3 MOT SCHOTTKY DIODE MBRS340T3 MOT SCHOTTKY DIODE MBRS340T3 MOT POWER TMOS FET MT
10. Table 4 7 V DC and V AC High Voltage Verification Tests Scope Meter output Vrms Frequency EA A B Reading A B 200V div 500V 298 e 2 885 ee 000 5 to 000 5 5 to 000 5 Lm o ECT sw e EZ sore oros me me setas mw cem senem ww e EXIT on e EXT Pw swwwm 4 5 15 Resistance Measurements Test Proceed as follows 1 Connect the test tool to the 5500A as shown in Figure 4 7 FLUKE 5500A CALIBRATOR ST8003 CGM Figure 4 7 Test Tool Input A to 5500A Normal Output 4 Wire 4 20 Performance Verification 4 4 5 Input A and Input B Tests Select the following test tool setup e Press to select auto ranging AUTO in top of display e Press Il to open the INPUT A MEASUREMENTS menu and choose MEASURE on A B OHM Q Set the 5500A to the first test point in Table 4 8 Use the 5500A COMP 2 wire mode for the verifications up to and including 50 kO For the higher values the 5500A will turn off the COMP 2 wire mode Observe the Input A main reading and check to see if it is within the range shown under the appropriate column Continue through the test points When you are finished set the 5500A to Standby Table 4 8 Resistance Measurement Verification Points 4 5 16 Continuity Function Test Proceed as follows l 2 c Oy cUm I DS Connect the test tool to the 5500A as for the previous test see Figure 4 7 Select the
11. The test tool has been designed and tested in accordance with Standards ANSI ISA S82 01 1994 EN 61010 1 1993 IEC 1010 1 CAN CSA C22 2 No 1010 1 92 including approval UL3111 1 including approval Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Use of this equipment in a manner not specified by the manufacturer may impair protection provided by the equipment 2 2 Dual Input Oscilloscope 2 2 1 Vertical Frequency Response DC Coupled excluding probes and test leads with STL120 1 1 shielded test leads with PM8918 10 1 probe optional accessory AC Coupled LF roll off excluding probes and test leads with STL120 with PM8918 Rise Time excluding probes and test leads Input Impedance excluding probes and test leads with BB120 with STL120 with PM8918 Sensitivity Display Modes DC to 20 MHz 3 dB DC to 12 5 MHz 3 dB DC to 20 MHz 6 dB DC to 20 MHz 3 dB lt 10 Hz 3 dB lt 10 Hz 3dB lt 1 Hz 3 dB lt 17 5 ns 1 MQ 12 pF 1 MQ 20 pF 1 MQ 225 pF 10 MQ 15 pF 5 mV to 500 V div A A B B 2 3 123 Service Manual Max Input Voltage A and B direct or with test leads 600 Vrms with BB120 300 Vrms For detailed specifications see 2 7 Safety Max Floating Voltage from any terminal to ground 600 Vrms up to 400Hz Resolution 8 bit Vertical Accuracy 1 0 05 range div Max Vertical Move 4 divisions Max Base Line
12. a amp ES a R495 REFADCB i TDA8792 D6 B D6 100p F 100 E 3 To ADC s for F aie VRB p 21 ADC_B_D7 p BUZZER ER K C3 PCB version 8 yo Rees trae te cto sea 1 4 cusa 7 IREF ax 24 SMPCLK E BUZZER BUZZER H495 3 H8 REF BUS VSSA2 VSSA1 STBY Nc vssp vsso OEN Os uz da iN di Ar ERIT TP473 TP474 SADC_BUS 15 47 AR A i f L 452 R496 BUZ 12 la 1 no lo p 1 Pau ie FREQPS 15 615 3K16 En MIDADC_B 1 L MAINVAL SEIS 2 E10 e 2 1 1 R469 ME SX BATIDENT 100K 5 85 1 KEYPAD FOIL 4 BAM 3 4 BA 3 3 BA a RERA a STBY B 4 1 32KHz 16MHz VGARVALF i R499 VGARVAL e 1 25MHz i 4 5 810 3 Hal 1 2 1 2L la tl nile PWRONOFF 15 616 poke 5810 S PCB version lt 8 1 IIT ll Jui RXD iab C489 1 TXD 1S H15 T VD A 1 L C486 C485 C484 C483 C482 ee 5 115 L 5 C16 4 PCB ion 8 SEE CIRCUIT DIAGRAM 4 4 F 27p 27p 22p 22p 22p S version DIGITAL CIRCUIT KEYBOARD t notfor PCB lt 8 Eres ST8089 WMF 9 10 Figure 9 4 Circuit Diagram 4 Digital Circuit Circuit Diagrams 9 9 2 Schematic Diagrams ROW3 G CG 922 0 GO NO lt 0 Z Z Z Z Z Sr SS T2 OO O KEYPAD FOIL 988888 988889 NI x 58 MS445 MS444 HS E e MS443 APA MS442 E B E i 63 E 70 A HA bh bh s E ee MS441 EEUU MS440 NENNEN MS439 MS438 ll E EA ROWS AZ MS437 ROWA 6 S436 ROW3 AB MS435 ROW2 _ 4 MS434 ROW 3 MS433 VHZA ROWO 2 MS432 2 gt 0 MS431 Ll HOLD SCOPE RUN
13. 7 Supply a 15 6 kHz square wave of 20V 10 10V to Input A and Input B 8 Check a TP308 TVOUT for 15 6 kHz 0 8 0 6V pulse square wave bursts see figure below A A R TEES 5 6 kHz Leo ms If not correct N301 may be defective TVSYNC on R392 R397 for 15 6 kHz 2 6 3 3V pulse bursts If not correct V395 may be defective TP311 ALLTRIG for 15 6 kHz 3 3 0V pulse bursts If not correct N301 may be defective TP433 TRIGDT for 0 3 3 pulses If not correct TRIGQUAL may be not correct TP338 TRIGQUAL for 0 0 6V pulses width 70 us frequency about 2 kHz If not correct D471 may be defective 7 5 9 Reference Voltages 1 Check a TP306 for 3 3V TP307 for 1 23V If not correct check replace V301 R307 C3112 P ASIC N501 TP301 for 1 6V TP303 for 1 23V TP302 for 0 1V TP304 for 3 3V TP310 see figure below in ROLL mode TP310 is zero If not correct check replace REFERENCE GAIN circuit and T ASIC N301 TP310 i l I I m 1 800 ms 7 5 10 Buzzer Circuit Press a and select MEASURE on A CONT 1 2 Short circuit Input A to COM The buzzer is activated now 3 Check TP496 for a 4 kHz 0 3V square wave during beeping 3 V if not activated 4 Check TP495 for a 4 kHz 3 30V square wave during beeping TP495 is 3V if the beeper is not activated 7 5 11 Reset ROM Circuit PCB version 8 only 1 Check TP486 for 3V or 12V if a pow
14. D aT evre ats ROM AS 133 ATU da ue Vp f GN L VDDDA 810 21 i LCDONOFF LCDONOFF pmsa22 sj Y2PDB rom_p15 as Boia AS 3 ROM A13 ss R403 VDDAA VDDO 19 DATACLKO DATACLKO oe ROM DOM 44597 A12 4 ROM A72 a B11 a A10 i 18 MS420 ROM Di4 43 poi4 AM S ROM_ATI 1 5 810 S 12VPROG MS419 VDDAA R466 3V3A ROM D06 42 6 ROM A10 C416 C407 f 17 LCDAT3 LCDAT3 A4 ce TE lt a 5 016 DQ6 A10 ae C408 1 qp MS418 ROM Di3 47 7 ROM A09 100n 100n 100n f 16 LCDAT2 LCDAT2 DQ13 A9 E 1 15 NC MS417 VDDAB 4 C465 ROM D05 40 pos As 8 ROM A08 Dalen gt oo TO 14 TODA LCDATi Mogae p tou ROM D 39 pan Nc 2 LCD 13 LCDATO LCDATO pms414 D 37 004 x Hr ROMWRITE 124 vec WER 6 2 22 MODULE 47 TLINECLK LINECLK Meus ROM_D11 36 ges 12 ROMRST VDDA VDDD VDDO pp 14 ADC_A DO l 10 1 FRAME FRAME uan ROM Do3 35 Da1 13 1 010 y ADC_A 5 vin pt 115 ADC A D1 91 BM TD gMs4t0 ROM Do 34 Dos VE HAD p2 16 ADC A D2 8 1M MS409 VD R47O__ 3V3GAR ROM D02 33 0210 WES Hg B11 REFADCT 8 VRT D3 7 ADC A D3 U 7_ LCDTEMP1 LCDTEMP1 a Ms408 t e C475 ROM D09 32 pee Rr 16 ROM A18 zc D401 pa 18 ADC A D4 VA 5 816 15 816 m VA pmseos cart L cara ca76 Fion 22 15 31 par AUS r7 ROM ATT P 9 VRM ps 19 ier 5 816 5 816 __ 3V3D_gisaos 100n 100n 100n ROM D08 30 de y De 20 i 4 REFPWI REFPWMT MS404 ROM D00 2 pee AT E RONCAUG REFADCB 10 vB TDA 8792 D7 21 ADC A D7 3 CONTRAST CONTRAST L Dao A6 19 ROM_A06 Re 1
15. Yo SAVE PRINT USER OPTIONS ST8108 960906 ST8108 WMF Figure 9 5 Circuit Diagram 4 cont Digital Circuit Keyboard 9 11 123 Service Manual
16. l BYD77A 1 68uH VIA 1 A10 2 A10 G L n EI gt lo 1 Ri EE kg DALAI i i 1 R504 R506 R507 L C509 3 amp xao Kk 8 C563 C576 TP577 E 315 Su V564 1 MAX 1E 1E 1E tu g SER V550 ETD15 MBRS1100 FP 150u L567 150u f R IDENT TEMP 9 208 Y BYD77A 47uH 30VD NTC 3V3GAR S gt TER Fi Dual we 4 C8 4 C9 1 els SWITCH gt T TP551 p AH1 4 315 9 lt 2 SERE A Ves Fn 1 UN 1 V554 BYD77A 1 n ed 1 VBAT 9 EE zo 3 Es veo 52 Veg 28K974 Bl L L MM i i S 56 0272 FLYBOOST a 2 3256 FLYBOOST rf R550 1 L C554 Lo 11 5 BEO snug 47 SNUB d AD is o ecu E zB du TP504 ES 3 S aoe gt 75 C551 css2 TP552 0550 UT A ES GNDD 100n 100n 9 Pan POWER ADAPTER FLYGATE FLYGATE A IS FLYSENSP 55 FLYSENSP a 2501 ens TP503 X900 BNX002 V501 V504 VBATMEAS R551 2 T E 1 oe T n oi H 1 sau R503 VBATSUP 60 oie eK Tox ul i 7 1 L C500 So Bt E tol TOE VBATSUP 4 a7 du 25V P Pae C505 MTD5P06E 1 e Cun a V503 ti C508 L C504 54 VSENS el VSENS i e i ANP PENA Toon A MBRS340 390u 10u N501 y 1 180u a LEY L OQ0256 aKa TP502 8 4K22 CHAGATE 16 cuacarE CHASENSN 14 CHASENSN CHASENSP 15 CHASENSP P ASIC ni Em VCHDRIVE 19 VCHDRIVE mavaa 58 3V3A s VADAPTER 20 vaDAPTER C502 P7VCHA 18 VRATSUR P7VCHA PN A 1 10u 57 IMAXFLY 3V3SADC IMAXFLY l CHARGER Lear ao V ar 100n GNDC GNDC L R558 Rsso R563 R564 L 31K6 5ktt 100K 100K MANCHA s RCH 2 u MAINVAL VADALOW a IMAXCHA y o
17. 4 50 to 5 50 4 5 13 Input A and B Phase Measurements Test Proceed as follows 1 Connect the test tool to the 5500A as for the previous test see Figure 4 5 2 Select the following test tool setup e Press to select auto ranging AUTO in top of display e Press a to open the INPUT A MEASUREMENTS menu and choose MEASURE on A W PHASE e Press TRER to open the INPUT B MEASUREMENTS menu and choose INPUT B M ON MEASURE on B M PHASE e Using Gi UY select 1 V div for input A and B 3 Set the 5500A to source a sine wave to the first test point in Table 4 6 NORMAL output WAVE sine 4 Observe the Input A and Input B main reading and check to see if it is within the range shown under the appropriate column Continue through the test points 6 When you are finished set the 5500A to Standby Table 4 6 Phase Measurement Verification Points 5500A output Vrms sine 5500A Frequency Reading A B 4 18 Performance Verification 4 4 5 Input A and Input B Tests 4 5 14 Input A and B High Voltage AC DC Accuracy Test Warning Dangerous voltages will be present on the calibration source and connecting cables during the following steps Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool Proceed as follows to test the Input A amp B High Voltage AC and DC Accuracy 1 Connect the test tool to the 5500A as shown in Figure 4 6 FLUKE 5500A CALIBRATOR
18. 5322 121 10616 5322 121 10527 5322 126 14046 5322 124 41979 5322 126 13825 5322 122 32268 5322 122 33082 Ordering Code List of Replaceable Parts 8 5 Main PCA Parts Remarks Reference Description Designator C212 C213 C214 C216 C217 C218 C219 C221 C222 C223 C224 C231 C232 C233 C234 C236 C242 C245 C246 C248 C252 C253 C256 C258 C259 C261 C262 C281 C282 C283 C284 C286 C287 C288 CER CAP 1 500V 0 25PF 4 7PF CER CAP 1 500V 0 25PF 4 7PF CER CAP 1 500V 0 25PF 4 7PF CER CAP 1 500V 0 25PF 4 7PF CER CAP 1 500V 2 10PF CER CAP 1 500V 0 25PF 4 7PF CER CAP 1 500V 0 25PF 4 7PF CER CAP 1 500V 2 33PF CER CAP 1 500V 0 25PF 4 7PF CER CAP 1 500V 0 25PF 4 7PF CER CAP 1 500V 2 33PF CER CHIP CAP 63V 0 25PF 0 68PF CER CHIP CAP 63V 0 25PF 4 7PF CER CHIP CAP 63V 5 47PF CER CHIP CAP 63V 5 470PF CER CHIP CAP 63V 10 4 7NF CHIPCAP NPO 0805 5 1NF CHIPCAP NPO 0805 5 1NF CHIPCAP NPO 0805 5 1NF CHIPCAP X7R 0805 10 10NF CERCAP X7R 0805 1096 15NF CHIPCAP X7B 0805 10 22NF CHIPCAP NPO 0805 5 1NF CER CHIP CAP 63V 5 150PF CHIPCAP NPO 0805 5 100PF CER CHIPCAP 25V 20 100NF CER CHIP CAP 63V 0 25PF 4 7PF ALCAP SANYO 10V 20 22UF CER CHIPCAP 25V 20 100NF ALCAP SANYO 10V 20 22UF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF ALCAP SANYO 10V 20 22UF CER CHIPCAP 25V 20 100NF 5322 122 33082 5322 122 33082 5322 122 33082 5322 122 33082 4822 122 31195 5322 122 33082 5322 122 33082 4822 122 31202 532
19. C12 R311 C3 3 G6 R472 B4 4 H8 R580 A4 5 A8 COMMON black input GENOUT A1 R110 R111 2K15 10M cit c112 4p7 R105 Apr STE c105 Pd R120 I 10M C113 C14 C116 4p R108 4p R117 4p7 E l STE 1 1 Ohms F Ps K173 eia 5 4 4p7 K173 2 3 C104 120p C199 10p 470 T i C122 pte 4p7 d R172 e 500E HF C121 33p R118 68E1 aaa call CHANNEL A lr cca ea ai 1 RA 1 1 44 PROBE_A 14 7 AC DC I CIS i EH sue e Vo i J i C101 C148 S E10 l 10n n 1 LF i i DN 214 R101 R102 O 487K 487K K171 s R137 R138 R139 S Se SOKD U 1 a pape sees Fae sa l 1 100n red input SY R106 SOPPM SOPPM E C106 I 4n7 R142 cu 447K i I 1 INPUT i 50PPM U 1 BLOCK 1 X100 REFATT U 1 1 1 i REF_BUS 1 1 14 3 H8 T l 1 1 U 1 l 1 1 R112 10M 44 swHFo 12 GNDHFO HF1 N101 DCBIAS R113 10M 7 swuri 15 GNDHF1 R125 19 HF2 SWHF2 Sat Ap GNDHF2 764E He GNDHF3 C124 FBO 33p R121 EBI 68E1 C107 470p R109 2K15 R104 26K1 EE R140 TET GPROT CALSIG PROTGND R144 SCLK 348E C146 R146 dn 215K s VATTN3V3 VAMPN3V3 i N I 348E R157 TP155 TP156 R158 287E 100E R165 R159 100E C159 C162 T 100p I 4p7 Circuit Diagrams 9 9 2 Schematic Diagrams 3V3A 3V3A 5VA APWM_BUS REF_BUS DACTESTA ADC_A T C161 100n MIDADC_A TRIG_A SENSE TRACEROT SDAT
20. C216 C217 C218 C219 C221 C222 C4 C4 A2 A1 B2 B3 A2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B3 A2 A3 B3 B3 C2 D1 C2 D3 D1 D2 D2 D2 D2 D2 D2 D2 D2 D2 D2 4 J10 C223 D2 2 C4 4 J11 C224 D3 2 C4 D401 B3 4 B4 C246 C2 2 F5 D451 C3 4 J4 1 E3 C281 C3 2 A9 D471 B4 4 F11 1 E2 C283 C3 2 C9 D474 A4 4 B15 1 C2 C287 D3 2 B2 D475 B5 4 F15 1 B4 C303 B3 3 E6 D480 A3 4 D15 1 F3 C313 D3 3 D7 1 B2 C314 A3 3 E6 H495 A3 4 116 1 B3 C317 C3 3 G6 H521 D3 5 K9 1 B2 C321 C3 3 C7 H522 D3 5 K8 1 B3 C322 C3 3 C7 1 B4 C333 B3 3 E11 K171 A2 1 E4 1 C3 C337 B3 3 G11 3 D14 1 C4 C339 B3 3 G11 K173 A2 1 C2 1 C4 C392 D3 3 G2 3 C14 1 D4 C395 C3 3 B10 K271 C2 2 E4 1 C4 C399 C3 3 A11 3 E14 1 C5 C465 D3 4 B12 L501 D4 5 E5 1 D5 C501 D3 5 E3 L564 AS 5 C14 1 F5 C502 C4 5 F6 L566 BS 5 C14 1 A9 C503 D4 5 E6 L569 D5 5 B14 1 C9 C504 D4 5 E6 L600 AS 5 J13 1 C8 C528 D4 5 H8 2 E3 C553 C5 5 610 N101 B2 1 D6 2 E2 C555 C5 5 C11 N201 C2 2 D6 2 C2 C561 C5 5 C13 N301 B3 3 D9 2 B3 C562 B5 5 C14 N501 D5 5 E5 2 E2 C563 B5 5 C14 2 A2 C564 A5 5 D14 R001 B1 1 E2 2 A2 C565 B5 5 B14 R002 C1 2 E1 2 B2 C567 B5 5 B14 R101 B2 1 E2 2 B2 C568 D5 5 B15 R102 B2 1 E3 2 B3 C572 C5 5 B15 R103 A2 1 E4 2 C3 C573 B5 5 C15 R104 A2 1 E4 2 C3 C574 A5 5 C15 R105 B2 1 B3 2 C4 C576 B5 5 C15 R106 A1 1 F2 2 C3 C581 A3 5 B10 R108 B2 1 B3 2 C3 C608 B5 5 J15 R172 A2 1 C2 C609 A4 5 J15 R201 C2 2 E2 R202
21. SCLK ICAL 5 C16 A e icio 5 816 4 D1 3 H8 5 J2 4 81 4 01 3 01 3 C1 3 F13 4 17 4 17 3 A1 ST8086 970604 ST8086 WMF Figure 9 1 Circuit Diagram 1 Channel A Circuit 9 7 INPUT B grey input 123 Service Manual 2 3 4 5 6 7 8 9 10 N201 L281 R282 DCBIAS VATTP3V3 E a eg ESV A 15 016 C282 c281 R210 R211 R212 R213 R214 mE 100n 22u 2K15 10M 10M 10M 10M 0211 C212 L282 3 47u 3V3A 4p7 o 4p7 VATTN3V3 dae 5 C16 STE c205 VAMPPSUP 10u R220 10M L283 SWHFO GNDREF a TU ENA 15 816 C213 C214 C216 GNDHFO 4p7 4p7 4p7 d R208 R217 a URMENSUS 511E SWHF1 C219 GNDHF1 GNDDIG 4p R225 E HF2 VDIGN3V3 VDIGN3V3 CERR1 10p APWM_BUS C222 C223 SWHE2 ae C204 4p R219 4p Bere 120p R216 464E HES 215E GNDHF3 ADDRESS C221 C224 gan 33p 33p OFESET OFFSET B R218 R221 REE a H8 68E1 68E1 REFN ese NEE E TP253 I HF CHANNEL B mcg UT DACTEST DACTESTE 5 J2 C207 470p BEEN TP254 ADC B 4 11 1 PROBE B 14 47 AC DC R209 i 2K15 TP255 C261 C248 C201 NA oum 5 10n 22n MIDADC 4 31 is TRGB e R201 R202 R204 i 787K 487K K271 26K1 LE D R237 R238 R239 R240 Ap 56K2 56K2 56K2 56K2 GPROT THER I R241 R243 ptc C202 a 100n 215K 909K an TRACEROT pone pu OPEM OPEM PROTGND TRACEROT 3 F13 C245 500E 4n7 R242 are v SCLK SDAT n R246 147K dn aoe 100p 215K s 2 50PPM 1n SDAT 14 7 SCLK 4 17 REFATT REF_BUS 3 H8 2 ST8087 970604 ST8087
22. Smooth Suppresses noise from a waveform Envelope Records and displays the minimum and maximum of waveforms over time Auto Set Continuous fully automatic adjustment of amplitude time base trigger levels trigger gap and hold off Manual override by user adjustment of amplitude time base or trigger level 2 3 Dual Input Meter The accuracy of all measurements is within of reading number of counts from 18 C to 28 C Add 0 1x specific accuracy for each C below 18 C or above 28 C For voltage measurements with 10 1 probe add probe uncertainty 1 More than one waveform period must be visible on the screen 2 3 1 Input A and Input B DC Voltage VDC Ranges Accuracy Turnover Normal Mode Rejection SMR Common Mode Rejection CMRR Full Scale Reading Move influence 500 mV 5V 50V 500V 1250V 0 5 5 counts 12 counts 760 dB 50 or 60 Hz 1 7100 dB DC gt 60 dB 50 60 or 400 Hz 5000 counts 6 counts max 2 5 123 Service Manual True RMS Voltages VAC and VAC DC Ranges 500 mV 5V 50V 500V 1250V Accuracy for 5 to 100 of range DC coupled DC to 60 Hz VAC DC 1 10 counts 1 Hz to 60 Hz VAC 1 10 counts AC or DC coupled 60 Hz to 20 kHz 2 5 15 counts 20 kHz to 1 MHz 5 20 counts 1 MHz to 5 MHz 10 25 counts 5 MHz to 12 5 MHz 30 25 counts 5 MHz to 20 MHz 30 25 counts excluding test leads or probes AC coupled with 1 1 s
23. by components obtained through your local FLUKE organization These parts are indicated with an asterisk in the List of Replaceable Parts Chapter 8 Chapter 2 Characteristics Title Page TPO OR AA 2 3 2 2 Dual Input Oscilloscope esses ener 2 3 PM MED tH 2 3 2 2 2 Ori Zonta 3352 25 32 nina TR HER HR HERD s 2 4 2 2 3 THEPEE ee neret eter re EE eq e n oH etes 2 4 2 2 4 Advanced Scope Functions esses 2 5 2 3 Dual Input Meter eerte e HP ette rete eiie eei 2 5 2 3 1 Input A and Input B sese eee 2 5 2 32 InDUE Ac ueste vets waves eee en nlt et AE eee eager Pete eite eta 2 8 2 3 3 Advanced Meter FUNCtIONS ooococnnononoconononcconnnonononnnonnnononnanonoonnananonnnanos 2 8 RE D E TT tede ette pti bete ne tet Nel tete e re EE ederet ideis 2 9 2 5 Environmental aida iba ad 2 10 2 6 Service and Maintenance n a an A A OE Yarran 2 11 2L SAL Cty T 2 11 2 8 EMC IMMUNITY id eto tr AAA E meet nene ie AA 2 12 2 1 2 1 Introduction Performance Characteristics Characteristics 2 2 1 Introduction FLUKE guarantees the properties expressed in numerical values with the stated tolerance Specified non tolerance numerical values indicate those that could be nominally expected from the mean of a range of identical ScopeMeter test tools Environmental Data The environmental data mentioned in this manual are based on the results of the manufacturer s verification procedures Safety Characteristics
24. 1VDC 0 5 A voltage on the Power Adapter input units having an Intel FlashROM For this purpose a special supply cable also advised for calibration can be ordered See figure 7 2 See Section 8 7 for the ordering number CAUTION To avoid damaging the test tool be sure to apply the polarity and voltage level of the 20V supply voltage correctly ees eee TEID a i WHITE Figure 7 2 20V Supply Cable for Loading Software Chapter 8 List of Replaceable Parts Title Page O 8 3 8 2 How to Obtain Paien e it desir E e 8 3 8 3 Final Assembly Parts cccccsccssccsssceseceseceeeceeeceseeeeseeseeeeeeeeeeeeeseeeseeeseeesaes 8 4 84 Mam PCA Unit Parts inicia lee i elitas 8 6 8 5 Vat PC A Parts 2 ove eee tetas debe etie TTT 8 7 8 6 Accessory Replacement Parts sese eee 8 24 877 Service KT eire etie tte it dores 8 24 List of Replaceable Parts 8 8 1 Introduction 8 1 Introduction This chapter contains an illustrated list of replaceable parts for the model 123 ScopeMeter test tool Parts are listed by assembly alphabetized by item number or reference designator Each assembly is accompanied by an illustration showing the location of each part and its item number or reference designator The parts list gives the following information e hem number or reference designator for example R122 e An indication if the part is subject to static discharge the symbol e Description e Ordering code Caution A sy
25. 22PF CER CHIP CAP 63V 5 22PF CER CHIP CAP 63V 5 27PF CER CHIP CAP 63V 5 27PF CHIPCAP NPO 0805 5 100PF CHIPCAP NPO 0805 5 100PF CC 22NF 10 0805 X7R 50V 1UF CERCAP Y5V 1206 10 ELCAP 25V 20 180UF ALCAP NICHICON 25V 20 10UF ELCAP 10V 20 390UF ALCAP NICHICON 16V 10UF CER CHIPCAP 25V 20 100NF CER CHIP CAP 25V 20 47NF CER CHIPCAP 25V 20 100NF CER CAP X5R 1206 10 1UF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF ALCAP NICHICON 6 3V 20 22UF CER CHIPCAP 25V 20 100NF CHIPCAP X7B 0805 10 22NF CC 22NF 10 0805 X7R 50V CER CHIPCAP 25V 20 100NF 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 122 32658 5322 126 13638 5322 122 32658 5322 122 32658 5322 122 32658 5322 122 32658 5322 122 31946 5322 122 31946 5322 122 32531 5322 122 32531 4022 301 60491 5322 126 14086 5322 124 11843 5322 124 11839 5322 124 11844 5322 124 41979 5322 126 13638 5322 126 14045 5322 126 13638 5322 126 14089 5322 126 13638 5322 126 13638 4822 124 80675 5322 126 13638 5322 122 32654 4022 301 60491 5322 126 13638 Ordering Code List of Replaceable Parts 8 5 Main PCA Parts Remarks Reference Description Designator C547 C548 C549 C550 C551 C552 C553 C554 C555 C561 C562 C563 C564 C565 C567 C568 C572 C573 C574 C576 C581 C583 C591 C592 C593 C594 C602 C603 C604 C605 C606 C607 C608 CHIPCAP X7B 0805 10 22NF CHIPCAP X7B 0805 10 22NF CH
26. 23 9 MS403 AOS ROMREAD 28_ Oy as 20 ROMAO Rom A49 f 4p MS402 27 21 ROM AQ4 0403 7 IREF 24 SMPCLK 1 1 30VD 15 016 5 016 30VD GND A4 i ar eu 24 i i a 5 016 5 016 im p MS401 ROM C8026 CE Aa 122 ROM A03 R488 FOR INTEL H8 M OS VSSA2 VSSA1 STBY ne vsspvssoO NT 0 77777777 LCD BUS ROM ADDR ROM_A00 28 lao a2 23 ROM A02 16M ROM ONLY EL 5 K2 LCDTEMP1 SE ROM A1 24 ROM A01 12 la 1 n ls la REF BUS L el Hlelslylelstelelseelele wiola oleo slag basic glelslelsise ROM_ADDR 3 H8 E NdSKES dg ZR RS RSKS R RSK paraada NENNE 58 85 S229222 eet MIDADC_A Z 305555 lt S E E E T G I E E G E E T E I E E ET 3 F1 CONTRAST zo zk SSG SGG SGG SBG 90090 4 ADCA_BUS 61 FRAME zESSSSS a SEG e eee arePiPReeeeece ee DL REE i STBY_A DTRG_BUS A A A Ha 8 413 m g y E E Q R483 PCB version 8 TP437 upar ini EE L I I VD 51K1 1 e K Res E S S 985943400340004344034d8 NS Basos Peso RAMPCLK eg TALVC32 i 2 e OsuxePLrRPDOPLLOSXQOI99 999cpOsD oOr O r9PDOHR3TOUDBORNPESBS i PCB version 8 EEES E EEE EC 421 e TP433 ru86588 QOzOoD06500000028 222222222528282 782855088 15 311 470P j e TRIGDT zo9gdog amp EorccrtrYxcrxrrxcc09 o000000gOrxOrOCrQ LOYE APWM BUS S PWM a 258 ETC crYcXYYYr Y xc 2 Delay circuit for PCB version 8 LVI FILTERS _ ee TRIGQUAL NC uc 5 wc 156 NC Dotted connection for PCB version 8 i ADC A D7 2 faece ur dq Y AAA AAA ee cee ee Wider POS
27. 4 8 4 5 4 Input A Frequency Measurement Accuracy Test 4 8 4 5 5 Input B Frequency Measurement Accuracy Test sese eee ee 4 9 4 5 6 Input B Frequency Response Upper Transition Point Test 4 10 4 5 7 Input B Trigger Sensitivity Test sese 4 10 4 5 8 Input A and B Trigger Level and Trigger Slope Test 4 11 4 5 9 Input A and B DC Voltage Accuracy Test 4 14 4 5 10 Input A and B AC Voltage Accuracy Test see 4 15 4 5 11 Input A and B AC Input Coupling Test sees sese eee 4 16 4 5 12 Input A and B Volts Peak Measurements Test see 4 17 4 5 13 Input A and B Phase Measurements Test 4 18 4 5 14 Input A and B High Voltage AC DC Accuracy Test 4 19 4 5 15 Resistance Measurements Test 4 20 4 5 16 Continuity Function Test 4 2 4 5 17 Diode Test Function Test sese 4 22 4 5 18 Capacitance Measurements Test see 4 22 4 5 19 Video Trigger Testirani nerean enne 4 23 Performance Verification 4 4 1 Introduction 4 1 Introduction Warning Procedures in this chapter should be performed by qualified service personnel only To avoid electrical shock do not perform any servicing unless you are qualified to do so The test tool should be calibrated and in operating condition when you receive it The following performance tests are provided to ensure that the test tool is in a proper operating condition If the test tool fails any of the performance tests calibration adjustment see Ch
28. 50 kHz 250 mVpp underloaded outputs Frequency high e g gt gt 100 kHz lt lt 100 mVpp bad FET V554 Sawtooth voltage is not linear 2 Check V552 and V553 check R570 and VCOIL connections b NoFLYGATE square wave is present Check TP526 FREQPS for a 50 100 kHz 3 3 Vpp square wave If correct then check V552 and V553 If no square wave on TP526 then go to step 4 7 9 123 Service Manual 4 Check TP528 PWRONOFF for 3V If not correct see Section 7 5 13 Power ON OFF 5 Check N501 pin 43 COSC for a triangle waveform 50 100 kHz 1 6V to 3 2V If not correct check C553 and connections check IREF see step 6 If all correct replace N501 6 Check N501 pin 74 IREF for 1 6V If not correct a Check N501 pin 73 REFPWM2 for 3V3 REFPWM2 is supplied by N501 and derived from REFP on the reference circuit on the Trigger part Check TP307 N501 pin 72 REFP for 1 22V If not correct check V301 R307 b Check R528 loose pin 74 or N501 defective 7 Check N501 pin 51 VOUTHI for lt 2 5V nominal value 1 65V If not correct check R558 and connections to N501 check IREF see step 6 8 Check N501 pin 57 IMAXFLY for z250 mV If not correct check R559 and connections to N501 check IREF see step 6 7 5 3 Slow ADC Check the following signals 1 BATCUR N501 pin 77 must be 1 63 6 7 x IBATP Volt If not correct replace N501 Measure IBATP on X503 pin 3 7 N501 pin 9 IBATP senses the bat
29. 5322 117 12465 5322 117 12479 5322 117 12477 5322 117 12472 5322 117 12472 5322 117 12472 4822 117 10837 5322 117 12471 4822 117 11948 4822 117 11948 4822 117 11373 4822 117 11373 4822 117 10833 5322 117 12462 4822 117 10833 4822 117 10833 4822 117 10833 4022 301 21761 4822 117 10837 4022 301 22241 PCB version lt 8 PCB version 2 8 PCB version lt 8 PCB version 2 8 Ordering Code List of Replaceable Parts 8 5 Main PCA Parts Remarks Reference Description Designator SMD RES 10K 1 TC50 0805 R486 R487 R491 R495 R496 R497 R499 R501 R502 R503 R504 R506 R507 R508 R509 R512 R513 R514 R516 R524 R527 R528 R529 R531 R532 R534 R535 R550 R551 R552 R553 R554 R555 SMD RES 10K 1 TC50 0805 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 51K1 3K16 3K16 OE SMD RES 56K2 1 TC100 0805 RESISTOR CHIP LRCO1 5 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RES FRCO1 1206 5 1E RES FRCO1 1206 5 1E RES FRCO1 1206 5 1E RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 0E1 10E 10E 10K 46E4 2K87 26K1 3K16 23K7 100E 147E 34K8 261K 21K5 SMD RES 100E 1 TC100 0805 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1
30. 6 Input B Frequency Response Upper Transition Point Test 4 10 4 5 7 Input B Trigger Sensitivity Test sese 4 10 4 5 8 Input A and B Trigger Level and Trigger Slope Test 4 11 4 5 9 Input A and B DC Voltage Accuracy Test 4 14 4 5 10 Input A and B AC Voltage Accuracy Test see 4 15 4 5 11 Input A and B AC Input Coupling Test sess 4 16 4 5 12 Input A and B Volts Peak Measurements Test sese 4 17 4 5 13 Input A and B Phase Measurements Test 4 18 4 5 14 Input A and B High Voltage AC DC Accuracy Test 4 19 4 5 15 Resistance Measurements Test 4 20 4 5 16 Continuity Function Test nennen 4 2 4 5 17 Diode Test Function Test sss 4 22 4 5 18 Capacitance Measurements Test see 4 22 4 5 19 Video Trigger Test 5n teet Rer nere b ree rer tea 4 23 Calibration AdjuStMent ccccccccccccccccccccccccncncccncnccononononononononononononos 5 1 5 L General z A A AEE iio 5 3 51 1 Introduction eie meret ee mte ke e b e Res 5 3 5 1 2 Calibration number and dat sss 5 3 5 1 3 General Instructions iet tete eee e e Pte eee cakes 5 3 5 2 Equipment Required For Calibration sse 5 4 5 3 Starting Calibration Adjustment sss sese eee eee eee 5 4 5 4 Contrast Calibration Adjustment sese sees eee eee ee 5 6 5 5 Warming Up amp Pre Calibration seen 5 7 5 6 Final Calibration iis ret i ert ee o tat ree ees eo dh 5 7 5 6 1 HF Gain Input A
31. 8 6 1 Disassembling the Test Tool 6 1 Introduction 6 1 Introduction This section provides the required disassembling procedures The printed circuit board removed from the test tool must be adequately protected against damage Warning To avoid electric shock disconnect test leads probes and power supply from any live source and from the test tool itself Always remove the battery pack before completely disassembling the test tool If repair of the disassembled test tool under voltage is required it shall be carried out only by qualified personnel using customary precautions against electric shock 6 2 Disassembling Procedures 6 1 1 Required Tools To access all the assemblies you need the following e Static free work surface and anti static wrist wrap e 8 and 10 Torx screwdrivers e Cotton gloves to avoid contaminating the lens and the PCA 6 2 2 Removing the Battery Pack Referring to Figure 6 1 use the following procedure to remove the battery pack 1 Loosen the M3 Torx screw item 15 do not remove it from the battery door 2 Lift the battery door at the screw edge to remove it 3 Lift out the battery pack and unplug the cable leading to the Main PCA pull the cable gently backwards 6 2 3 Removing the Bail Referring to Figure 6 1 use the following procedure to remove the bail item 16 1 Set the bail to a 45 degree position respective to the test tool bottom 2 Holding the test tool tight r
32. 8 3 8 2 How to Obtain PaltS essere nnne 8 3 8 3 Final Assembly Parts sees eee 8 4 8 4 Main PCA Unit Parts sss sese eee 8 6 8 5 Mam PCA Parts ie cen eee e sodas cat een e ER HIT ER RR ANNE 8 7 8 6 Accessory Replacement Parts sse 8 24 8 7 Service Lools meet eas eo er aee ce a e deri aae REUS 8 24 Circuit DIAS ccoo ine E xS EXE EXER X EN EX KE EXER FREE EXER 9 1 9 1 Introduction zu PEE Na 9 3 9 2 Schematic Dia Grams tail ede e eee etit ee e ce oe eene 9 4 123 Service Manual 10 Modifications 10 1 Software modifications se 10 2 Hardware modifications sse List of Tables Table Title Page 2 1 No Visible Trace Disturbance ccococcccnononnnonononnnonnnananonnnnnnnnonnnanonoonnnnnnconnanononnna ness 2 12 22 Trace Disturbance lt 1090 tete tre e ee et chee fet 2 12 2 3 Multimeter Disturbance lt 1 San REER eene nenne enne entree eerie 2 12 351 Fluke 123 Main Blocks orn hereto eterne 3 3 3 2 Fluke 123 Operating Modes sese 3 9 3 3 Voltage Ranges And Trace Sensitivity sese eee ee 3 18 3 4 Ohms Ranges Trace Sensitivity and Current sese eee 3 18 3 5 Capacitance Ranges Current and Pulse Width 3 20 326 DEASIC PWM Sien ls oum E EAM ge 3 29 4 Input A B Frequency Measurement Accuracy Test sese ee 4 9 4 2 Volts DC Measurement Verification Points eese 4 15 4 3 Volts AC Measurement Verification Points sss eee eee ee 4 16 4 4 Input A and B AC Input Coupling Verific
33. A Channel B Measurement CircullS oooococnnnoncccnoonnnnocnonnnanoss 3 4 32 2 Trigger Circuit e A ias 3 4 3 2 3 Digital CCU ti ee ete lt ib As 3 5 3 2 4 PoWet CIECUIL a ss 3 6 3 2 5 Start up Sequence Operating Modes sese 3 7 3 3 Detailed Circuit Descriptions 3 9 3 3 Power Cirt iaa eet eee eee eel e eene eed 3 9 3 3 2 Channel A Channel B Measurement Circuits sees eee 3 15 33 3 Trigger ATT ee a eae eder ee r Se 3 20 3 34 Digital Circles 3 25 3 1 123 Service Manual 596115 YOLYAANOD LHSITDIDVE Andino AH IlV8A IVLIDIO OL Sng oavs MWVOEAE a Sng WMdv ie dy x gt AXI E vaxa HVOEAE YNOYWHOD 9sz000 OISV H3MOd 193138 DAVMOAS ASTO0YS L dW31Q91 81S310vd V1S310vVd 1N30l1V8 DOALWS dW3 Live unolva 3SN3S HVOEAE AHQOHVOA HHnOHVOA 31VOVHO HOLH3ANOO H39HVHO uaiavav H3MOd OXL aava axy 3dONOHMd WO1U3ANO2 NOVE M3 l AO l ene AE Ast x l TO NE UWABVOA HVOEAE AlddNs HV3NI1 MOVd AY3LIVA moso Sng WMdv sng oavs was X108 8 d80ud OlHgXova axi OXY 3JONOUMdA SdOdud TIVANIVIA TVAHVOA l1SuWou 2000 LOW OISV TVLISIG 91 uaav HVOEAE 91 viva du HSV
34. A08 3 30 RAM CS0 TOK i s 24 TROTRST RAMRD 133 READRAM HRAM A13 2 1 C479 Hr A SHLDPWM D ASIC 132 WRITERAM T A13 nas 29 RAM D 2p ae HO RNDM 26 pwMA10N6 RAMWR E WRITERAM 5 w Da7 28 RAM D6 100n TRGLEVAD 27 PWMA10N5 VOD 1330 wo mq 8 S2 A17 DQe 27 RAM DS n CONTRAST R409 R436 CONTR D L zo TRGLEV2D 28 PWMA10N4 129 B11 aa aoo PRAMAS 7 A15 Das 26 ROM DA c GK1 OKT POS BD 29 RAMAO 8 25 RAM D3 3V3D PWMA10N3 128 RAM A01 VCC DQ4 5 C16 DPWM_BUS NC 30 RAMA1 gt RAM_A18 9 24 C436 Z NC 30 PwMAtON2 127 RAM A02 NC A18 GND L OFFSETBD di RAMA2 L RAM A16 10 28 RAM D2 Su BEER WAH PWMA12N1 RAMAS 1126 RAM A03 RAM A14 q 1 M6 DQ3 R405 R408 32 VDDREFA MOTO0002N1 125 RAM A04 A14 DQ2 22 RAM D1 RATES he pa pan L 33 VOOREP ramas 125 RAM_AO4 RAM A12 12T auz Do1 21 RAM DO CONTRAST C463 OFFSETAD E S een nal RAM A06 RH 13 A7 Ao 20 RAM A00 100n BACKBRIG 35 6 RAM_A06 lae RAM 19 RAM A01 dpud chp ie Pe A 5 K16 qe RAS 9 PWMATON1 RAMA7 122 RAM_A07 A1 POS_A_D 36 PwMA10NO 121 RAMCAO8 LLE 15 Jas 42 18 RAM A02 de CONTR_D 37 PWMA8NO RAMAS 120 a L 16 a4 a3 17 RAMEADS V401 C404 SADCLEVD 30 VODREFB Rawat DIS RAM A10 SI2x SRAM BSN20 nR 470p SAOCLEND 39 PWMB10N0 RAMAN 118 RAM_ATI i iS un 40 PWMB8no Ramar2 117 RAM_AT2 a 07 me if 1000 m ADCS BDF Bt amp qz VCLAMPB RAMA13 116 RAM_A13 R410 REF_BUS ADO DE 331 ADCB7 RAMA14 115 RAM_A14 VD an eoe 8 e L ADC B D 43 apcae vss 114 ADC E DA 4
35. C436 C438 C439 C441 C442 C451 C452 C453 C457 C458 C463 C464 C466 C470 C471 C472 C473 C474 C475 C476 C478 C479 C480 C3 C4 C3 C3 C3 C3 B3 B3 C3 C3 B3 B3 A3 B3 B3 C3 C3 B3 C3 C3 C3 D4 D3 C3 D3 C3 B4 B4 B3 B4 C4 C4 C3 C3 C4 B3 B3 B3 B3 B3 B4 B4 B3 C3 C4 C4 C4 B4 D4 D4 BS C4 C4 3 E11 3 E10 3 G11 3 F9 3 A10 3 B10 3 F5 3 F4 p mnn E G E E LT Gb EE tag RK al OW TI N NON CG BR BORRAR WWWWWWWW L QO N SD ES 4 H2 wo m m m mm ww wm Cc cc NN aa TI o gg RO 65 4 D15 4 B11 4 B11 4 B11 4 B12 4 C14 4 E16 4 G16 4 F4 4 F5 C481 C482 C483 C484 C485 C486 C487 C488 C489 C500 C505 C506 C507 C509 C511 C512 C532 C529 C531 C534 C547 C548 C549 C550 C551 C552 C554 C583 C591 C592 C593 C594 C602 C603 C604 C605 C606 C607 C610 D531 L181 L182 L183 L281 L282 L283 L481 L562 L563 L567 B4 B4 B4 B4 B4 B4 B4 B3 B4 A4 A4 A5 A5 A5 D5 D5 B4 A4 C4 A4 A5 A5 A4 A5 A5 A5 D5 A4 B5 B5 B4 C3 D3 D3 A3 B3 B3 C4 C5 C5 C5 4 J11 4 J11 4 J10 4 J10 4 J9 c oO S 30 C N n Gd tM g mim o o al al o co O Noa FTABZSSaRZEZERVELL A 13 KR oa oa aA co Co wo Co A Ln n n n On Ln Qn O1 OQ Ln Qn Gn n O1 OQ OQ n Gn Ln Qn Qn n Ln Qn E as E oO 5 K10 5 K11 5
36. CHIP CAP 63V 10 4 7NF CHIPCAP X7B 0805 1096 22NF CHIPCAP X7B 0805 10 22NF CER CHIP CAP 63V 0 25PF 4 7PF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF ALCAP NICHICON 16V 10UF CER CHIPCAP 25V 20 100NF CC 470 PF 5 0805 NPO 50V CER CHIPCAP 25V 20 100NF 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 122 32654 5322 122 32287 5322 126 13638 5322 126 13638 5322 122 32268 5322 126 13638 5322 126 13638 5322 122 32654 5322 126 13638 5322 126 13638 5322 126 13638 5322 122 32654 5322 122 32654 5322 126 14089 5322 126 10223 5322 126 10223 5322 122 32654 5322 122 32654 5322 122 32287 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 124 41979 5322 126 13638 4022 301 60371 5322 126 13638 8 123 Service Manual Ordering Code Remarks Reference Description Designator C472 C473 C474 C475 C476 C478 C479 C480 C481 C482 C483 C484 C485 C486 C487 C488 C489 C500 C501 C502 C503 C504 C505 C506 C507 C509 C511 C512 C528 C529 C531 C532 C534 CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIP CAP 63V 5 22PF CER CHIPCAP 25V 20 100NF CER CHIP CAP 63V 5 22PF CER CHIP CAP 63V 5 22PF CER CHIP CAP 63V 5
37. CL0640 is a separate step Wait until the display shows Pulse Adj A CL 0640 READY For firmware V01 00 wait until the display shows Delay CL 0720 READY When you are finished set the 5500A to Standby Continue at Section 5 6 4 For firmware V01 00 continue at Section 5 6 3 5 6 3 Pulse Adjust Input A firmware V01 00 only Note For firmware versions newer than V01 00 the Pulse Adjust Input A CL0640 step is included in Section 5 6 2 Proceed as follows to do the Pulse Adjust Input A calibration 1 2 U2 9o c3 gy SON IE Press to select calibration step Pulse Adj A CL 0640 IDLE Connect the test tool to the 5500A as for the previous calibration Figure 5 4 Set the 5500A to source a 1V 1 MHz fast rising square wave SCOPE output MODE edge rise time lt 1 ns aberrations lt 2 pp Set the 5500A to operate OPR Press E to start the calibration Wait until the display shows Pulse Adj A CL 0640 READY When you are finished set the 5500A to Standby Continue at Section 5 6 4 Calibration Adjustment 5 6 Final Calibration 5 6 4 Pulse Adjust Input B Proceed as follows to do the Pulse Adjust Input A calibration l Press to select calibration step Pulse Adj B CL 0660 IDLE 2 Connect the test tool to the 5500A as shown in Figure 5 5 FLUKE 5500A CALIBRATOR ST8005 ST8005 CGM Figure 5 5 5500A Scope Output to Input B 3 Set the 5500A to source a 1V 1 MHz fast risi
38. Characteristics 2 2 3 Dual Input Meter 2 to 98 15Hz 1Hz to 30 MHz 0 5 2 counts 1 0 2 counts 2 5 2 counts 0 1 15Hz 1Hz to 30 MHz 0 5 2 counts 1 0 2 counts 2 5 2 counts 1000 counts with optional current probe same as VDC VAC VAC DC or PEAK 1 mV A 10 mV A 100 mV A and 1 V A same as VDC VAC VAC DC or PEAK add current probe uncertainty with optional temperature probe 200 C div 200 F div 1 mV C and 1 mV F as VDC add temperature probe uncertainty 1V 1 mW referenced to 600Q or 50Q VDC VAC or VAC DC 1000 counts 1 to 10 5 1 count 100 counts AtoB BtoA 0 to 359 degrees 1 degree 1 count 1 degree 2 7 123 Service Manual 2 3 2 Input A Ohm Q Ranges Accuracy Full Scale Reading 500Q to 5 MQ 30 MQ Measurement Current Open Circuit Voltage Continuity CONT Beep Measurement Current Detection of shorts of Diode Maximum Voltage 0 5 mA open circuit Accuracy Measurement Current Polarity Capacitance CAP Ranges Accuracy Full Scale Reading Measurement Current Measurement principle 2 3 3 Advanced Meter Functions Zero Set Fast Normal Smooth Meter settling time Fast Meter settling time Normal Meter settling time Smooth 2 8 50002 5 KQ 50 kQ 500 KQ 5 MQ 30 MQ 0 6 5 counts 5000 counts 3000 counts 0 5 mA to 50 nA decreases with increasing ranges lt 4V 300 5Q in 50Q r
39. Introductionis ts eer ee enel bee ended 7 3 7 2 Starting Fault Finding sss sese eee 7 4 T3 Charger Circuit coepere rete i estie Fires P Poe Ee POE P eR ae ES Ue 7 4 7 4 Starting with a Dead Test Tool sss 7 6 7 4 1 Test Tool Completely Dead 7 6 7 4 2 Test Tool Software Does not Run sss eee 7 7 7 4 3 Software Runs Test Tool not Operative sss sese sees eee eee 7 7 7 5 Miscellaneous Functions esses eee nennen nnns 7 8 7 5 1 Display and Back Light sss 7 8 7 5 2 Ely BaeleGonverter 32 edet ettet tei ee eee avg 7 9 TAI SLOW AD su cree ao pets LER 7 10 TDA Keyboard eter eet tee e P P erbe ee 7 11 7 5 5 Optical Port Serial RS232 Interface sse 7 11 7 5 6 Channel A Channel B Voltage Measurements sese eee eee eee 7 12 7 5 7 Channel A Ohms and Capacitance Measurements sese eee ee eee 7 13 75 8 Trigger FUN CHONS iii dada ide ib trigo 7 14 7 5 9 Reference Voltages esses eee enne nnns 7 15 TSAO Buzzer CIRCUM oen cfe erdt eee eee eerte late ee eerie 7 15 7 5 11 Reset ROM Circuit PCB version 8 only 7 16 7 5 127 RUN TES e Sco vet ess ptis es 7 16 7 543 Power ON OFF 5 debes ietslb tee SUM sertis ap ee NE 7 16 TS DAP Circuitina abt uda staat t n res 7 17 T 5 15 Randoimize Circuit ee tertie ots 7 17 7 6 Loading Software msiende eee neret 7 17 List of Replaceable Parts LLLeeeeeeeeseeeeeeeeeeeeeeeeeee 8 1 Sob Introd ctiorn ud eter et eerte tm te etian
40. K11 5 K10 5 K12 5 K15 5 J5 1 A9 1 A9 1 B9 2 A9 2 AQ 2 B9 4 A16 5 B14 5 B14 5 C14 N531 N600 R109 R110 R111 R112 R113 R114 R116 R117 R118 R119 R120 R121 R125 R131 R132 R133 R134 R136 R137 R138 R139 R140 R141 R142 R143 R144 R146 R151 R152 R153 R154 R155 R156 R157 R158 R159 R160 R161 R165 R171 R173 R182 R184 R186 R188 R189 R209 R210 R211 R212 R213 5 J6 5 J11 1 E5 1 A4 1 A4 1 A4 1 A5 1 A5 1 C3 1 B3 1 D4 1 C4 1 B4 1 D5 1 C4 1 D5 1 D5 1 D5 1 E5 1 E5 1 E3 1 E3 1 E4 1 E4 1 E3 1 F4 1 E4 1 F5 1 F5 1 C8 1 C8 1 D8 1 D8 1 D7 1 D8 1 D8 1 E7 1 F7 1 D7 1 D8 1 E8 3 D12 3 C12 1 A7 1 A9 1 B7 1 B7 1 B9 2 D4 2 A3 2 A3 2 A4 2 A4 9 123 Service Manual R214 A2 2 A5 R326 B3 3 C6 R473 B3 4 18 R591 R216 A2 2 C3 R331 C3 3 C7 R474 B4 4 18 R600 R217 A2 2 B3 R337 C3 3 F11 R478 C4 4 F5 R602 R218 A2 2 D3 R342 C3 3 G11 R479 C4 4 F5 R603 R219 A3 2 C4 R352 D1 3 B3 R480 C4 4 E5 R604 R220 A2 2 B4 R353 D1 3 B3 R481 C4 4 E15 R605 R221 A2 2 D4 R354 D3 3 A2 R482 C4 4 D16 R606 R225 A2 2 C4 R356 D3 3 A2 R482 C3 4 D15 R231 B2 2 C5 R369 B3 3 C11 R483 C4 4 E16 V171 R232 B2 2 D5 R371 C3 3 E3 R483 C3 4 D16 V172 R233 B2 2 D5 R375 B5 3 E2 R491 B4 4 H14 V174 R234 B2 2 D5 R376 B3 3 F3 R495 D3 4 115 V301 R236 B2 2 E5 R377 B3 3 F3 R496 D3 4 J15 V302 R237 A1 2 E3 R385 C4
41. R125 R131 R132 R133 R134 R136 R137 R138 R139 R140 R141 R142 R143 R144 R146 R151 R152 R153 R154 R155 R156 R157 R158 R159 R160 R161 R165 R171 R172 R173 R182 RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RC12H 1 RC11 2 RC12H 1 RC12H 1 RC12G 1 RC12G 1 RC12G 1 RC12G 1 RC 02G 1 RC 02H 1 RC 02H 1 RC 02H 1 RC 02H 1 RC12G 1 RC12G 1 RC12G 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12G 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12G 1 RC12H 1 RC12H 1 464E 10M 68E1 68E1 1M 100K 10K 1K 100E 56K2 56K2 56K2 56K2 215K 147K 909K 348E 215K 100K 100K 681K 681K 178K 100K 348E 287E 100E 51K1 100K 100E 348E PTC THERM DISC 600V 300 500E RESISTOR CHIP RC12H 1 348E RESISTOR CHIP RC12H 1 10E 5322 117 12455 4822 051 20106 5322 117 12454 5322 117 12454 5322 117 12484 5322 117 12485 5322 117 12486 5322 117 12487 4822 051 51001 5322 117 10574 5322 117 10574 5322 117 10574 5322 117 10574 5322 117 12488 5322 117 12489 5322 11
42. RT nono E nn nnne 3 15 3 9 Capacitance Measurement ee eee eee eee 3 19 3 10 T ASIC Trigger Section Block Diagram sees eee 3 21 3 11 Random Repetitive Sampling Mode sss sss eee 3 22 3 12 Reference Voltage Section rossis eerie iire iri T EEEE E iE 3 24 3 13 LCD Control IA E a a e Ea aaa aaa aaa 3 28 4 1 Display Pixel Test Pattern enserrat i E ene eene RE N cet 4 4 4 2 Menu ttem Selection 4 secet e r Pee eren e ch E ier E a RE 4 6 4 3 Test Tool Input A to 5500A Scope Output 50Q sese eee eee 4 7 4 4 Test Tool Input B to 5500A Scope Output 50Q eee eee 4 9 4 5 Test Tool Input A B to 5500A Normal Output sese 4 11 4 6 Test Tool Input A B to 5500A Normal Output for 300 eee 4 19 4 7 Test Tool Input A to 5500A Normal Output 4 Wire seen 4 20 4 8 Test Tool Input A to TV Signal Generator sese eee eee eee 4 23 4 9 Test Tool Screen for PAL SECAM line 622 see 4 24 4 10 Test Tool Screen for NTSC line 525 4 24 4 11 Test Tool Screen for PAL SECAM line 310 seen 4 25 4 12 Test Tool Screen for NTSC line 262 enne 4 25 4 13 Test Tool Input A to TV Signal Generator Inverted esses 4 25 4 14 Test Tool Screen for PAL SECAM line 310 Negative Video sss sees 4 26 4 15 Test Tool Screen for NTSC line 262 Negative Video sss 4 26 5 1 Version amp Calibration Screen see eee 5 3 52 Display Test Pattern td rte ette t ete Pa e t rec ete 5 6 5 3 HF Gain Calibration Input Connections
43. SE R604 DACTESTT 2 10K CT zD DER gt TCDTEMPT ra B el 0532 tu 4 an ae 4 07 n Y 220 O eco AAA cane ERS C607 3 R603 1 10n I MUX TP537 zi pDOWASQUE A8 d I 1n 4 014 LON I L 10081 vini OP906 SFH409 BSN20 SADCLEV R531 e 1 cee R606 TP604e R602 0610 ree Gy C501 C502 LC593 L C594 Nel ARS For PCB versions lt 8 SP E we Se irist k 6K19 10K tu 1 BACKBRIG__ 14 68 100n 100n 100n 100n E R532 0 Ohm is a track i n EV OMS R605 amp R606 not for PCB versions 8 sree nottor versions du APWM BUS ir racc cuntur 1 ST8090 2 EE OPTICAL PORT 1 00 01 24 ioe See eee 9 12 Figure 9 6 Circuit Diagram 5 Power Circuit ST8090 2 WMF Circuit Diagrams 9 9 2 Schematic Diagrams i is 5 MS422 MS454 MS453 j R106 N TP336 TP436 e e TP338 Pae e css O ra R33 TP438 e ez 451 220k UR OCR Co R2 220k TP302 R391 P R392 J P322 52 Ps08 53 14 IP476 TP534 mne O rm mu a 15563 TP536 e e v TESS TP451 ct r1 Jn B402 B403 TP253 o TP473 C572 74 e TP576 8 TP5 l TP561 e 2 16 aw ER la O 51 97 097 IP306 09777 25 24
44. Service Manual
45. The power adapter voltage is applied to R501 The Charger Converter circuit controls the battery charge current If a charged battery pack is installed VBAT is approximately 4 8V If no battery pack is installed VBAT is approximately 15V The voltage VBAT is supplied to the battery pack to the P ASIC to the Fly Back Converter and to transistor V569 The FET control signal CHAGATE is a 100 kHz square wave voltage with a variable duty cycle supplied by the P ASIC Control circuit The duty cycle determines the amount of energy loaded into L501 C503 By controlling the voltage VBAT the battery charge current can be controlled The various test tool circuits are supplied by the Fly Back Converter and or V569 Required power adapter voltage The P ASIC supplies a current to reference resistor R516 VADALOW pin 8 It compares the voltage on R516 to the power adapter voltage VADAPTER on pin 20 supplied via R502 and attenuated in the P ASIC If the power adapter voltage is below 10V the P ASIC output pin 12 and the line MAINVAL are low This signal on pin 12 is also supplied to the P ASIC internal control circuit which then makes the CHAGATE signal high As a result FET V506 becomes non conductive and the Charger Converter is off Battery charge current control The actual charge current is sensed via resistors R504 R506 507 and filter R509 C509 on pin 9 of the P ASIC IBATP The sense voltage is supplied to the control circuit The re
46. WMF Figure 9 2 Circuit Diagram 2 Channel B Circuit 9 8 Circuit Diagrams 9 2 Schematic Diagrams 9 1 2 4 5 6 7 8 9 10 1 12 13 14 1 F10 PAL T GE NOUT R354 R356 VCC5REF VCC3ATR C356 l C399 15 or18n FILM 100n R391 A RA 1K C357 TVSYNC 22n i R390 R392 i SYNC PULSE 464K 4K22 i SEPARATOR II o Ne Pe er V395 e C395 BC848C RELAY 47 TVOUT il Ky i CONTROL GINS TRIGLEV2 R322 SENSE 2llz 1 810 Im Im SUE o o TRIG A 1 810 4 01 APWM_BUS V174 2 E10 ype RIGB i E c T REF BUS BCV65 x koc G8 TP321 Sl le 2 ini O to ui Ie IS iu S lu R326 Ea co gt 6 1 562K tole el owe LM a RIS K173 rzl E CER 348E TP301 Rsun2 296 touc 3V3A OI a Ont W gt Zu zZO2 Lan weow 5VA 1431134 eee REFATT BEFATE E 9 vecsatr _17 VCC3ATR 18 BIAS vin GNDDISTR BIAS Rover GAINREFN GAINREFN ona 24 OHM R301 REEN acoca 22 ACDCA 3K16 REFP Acpca 23 ACDCB 10 1 DEFERENCE 1 REFADCT VCC5REF vccspr 20 VCCSDT i REFERENCE cata VCC3REF N301 VCC3DT A VEEDT R171 kizi VEEREF VEEDT 348E HOAN e as a R305 ka GNDREF T ASIC GNDDT 26 ar VGA 10K C301 GAINADCT GAINADCT 0Q0257 TRACEROT 50 a 9VA 100n GAIN
47. When the test tool has beeped twice the RESET was successful For most tests you must turn Input B on Input A is always on Proceed as follows to turn Input B on e Press vrza to open the Meter B menu s Using G select INPUTB ON e Press to confirm the selection the mark changes to W The active setting from the next item group will be highlighted for example M VAC and maintained after leaving the menu e Press to exit the menu During verification you must open menus and to choose items from the menu Proceed as follows to make choices in a menu see Figure 4 2 e Open the menu for example press E s Press G amp to highlight the item to be selected in a menu e Press to confirm the selection and to jump to the next item group if present Item groups in a menu are separated by a vertical line e After pressing in the last menu item group the menu is closed 4 5 123 Service Manual 4 6 Esa S ME A O W S A amp E S amp f 2 gt gt D CESE O A amp Y S B O4S 8 00 O A amp O Qs 95 amp 00 EN yo Figure 4 2 Menu item selection ST7968 CGM If an item is selected it is marked by W Not selected items are marked by Ifa selected item is highlighted an then 1s pressed the item remains selected You can also navigate through the menu using 96 To conform the highlighted item you must press
48. amp B esses eene enne 5 7 5 6 2 Delta T Gain Trigger Delay Time amp Pulse Adjust Input A 5 9 5 6 3 Pulse Adjust Input A firmware V01 00 only sess 5 10 5 6 4 Pulse Adjust Input B enne 5 11 5 6 5 Gain DMM Gain Volt ene 5 11 56 6 MOlt Zero i ee ai 5 13 5 6 7 Zero Ohm firmware V01 00 onl sese 5 13 5 6 8 Gain Ohm urhe eo Werte made to PRESE 5 14 5 6 9 Capacitance Gain Low and High senes 5 15 5 6 10 Capacitance Clamp amp Zero sse 5 15 5 06 11 Capacitance Gain ee id ee ee edem e Pe adidas 5 16 5 7 Save Calibration Data and RX 5 16 Contents continued Disassembling the Test Tool eeeeeeeeeeeeeenenne 6 1 6 1 Introd ctlon s see co eee let edi ette di e ace ee eee 6 3 6 2 Disassembling Procedures esses 6 3 6 1 1 Required Tools tette ec eb edet ier ede eoe agde 6 3 6 2 2 Removing the Battery Pack sees 6 3 6 2 3 Removing the Ball 6 3 6 2 4 Opening the Test Tool sse 6 3 6 2 5 Removing the Main PCA Uhnit essere 6 5 6 2 6 Removing the Display Assembly 6 6 6 2 7 Removing the Keypad and Keypad Foil sss 6 6 6 3 Disassembling the Main PCA Unit 6 6 6 4 Reassembling the Main PCA Unit sese eee eee 6 8 6 5 Reassembling the Test Tool 6 8 Corrective Maintenance eeeeeeeeeeeeeeeeeeee enn n nnn ree 7 1 7 Y
49. and Input B and change the test tool sensitivity V div to make the complete square wave visible Check TP154 ADC A and TP254 ADC B for the signal shown below Input positive Input zero e peepee seem vem een OR Input negative 0 3 to 1 4V 150 mV div A trace amplitude of 1 division results in an 150 mV voltage on TP154 255 Moving the trace position with a zero input signal results in a TP154 254 voltage of about 0 3V bottom to 1 4V top If the voltages are not correct do steps 6 to 16 if these steps are correct then replace the C ASIC If the voltages are correct the error is most probably caused by the ADC or ADC control continue at step 16 Check TP156 TRIGA and TP256 TRIGB The TRIGA and TRIGB signals must be the inverted input signals with an amplitude of 50 mV per division trace amplitude Moving the trace position with a zero input signal results in a TP156 256 voltage of about 0 4V bottom to 0 4V top If the voltages are not correct do steps 6 to 16 if these steps are correct then replace the C ASIC Check the supply voltages 3V3A 3 3V 3V3A 3 3V and 5VA 5V If not correct trace to the Fly Back converter on the Power part Check TP151 POS A and TP251 POS B for about 1 1V trace at mid screen 0 4V trace at top of screen 1 8V trace at bottom of screen If not correct check the PWM circuit in the Digital Circuit Check TP152 OFFSET A and TP2
50. by the C ASIC to 150 mV division Zero and gain measurement are done to eliminate offset and gain errors The C ASIC output voltage is supplied to the Channel A B ADC D401 D451 pin 5 The ADC samples the analog voltage and converts it into an 8 bit data byte DO D7 The data are read and processed by the D ASIC see below ADC data Acquisition 3 25 123 Service Manual 3 26 The sample rate depends on the sample clock supplied to pin 24 The sample rate is 5 MHz or 25 MHz depending on the instrument mode The ADC input signal is sampled on the rising edge of the sample clock The digital equivalent of this sample is available on the outputs DO D7 with a delay of 6 sample clock cycles The reference voltages REFADCT and REFADCB determine the input voltage swing that corresponds to an output data swing of 00000000 to 11111111 DO D7 The reference voltages are supplied by the reference circuit on the Trigger part The ADC output voltages MIDADC A B are supplied to the C ASIC s input pin 28 and are added to the conditioned input signal The MIDADC voltage matches the middle of the C ASIC output swing to the middle of the ADC input swing Current IREF is supplied to pin 7 of the ADC s via R403 R453 for biasing internal ADC circuits The D ASIC can disable the ADC conversion by making the STBY A STBY B line pin 1 high Conversion also stops if the sample clock stops ADC data acquisition for traces and numerical readings Durin
51. display Do not press anymore s Using A EJ change the sensitivity to select manual sensitivity ranging and lock the Input A sensitivity on 200 mV div Set the 5500A to source a leveled sine wave of 1 2V peak to peak 50 kHz SCOPE output MODE levsin Adjust the amplitude of the sine wave to 6 divisions on the test tool display Set the 5500A to 20 MHz without changing the amplitude Observe the Input A trace check to see if it is 4 2 divisions When you are finished set the 5500A to Standby Note The lower transition point is tested in Section 4 5 11 4 5 4 Input A Frequency Measurement Accuracy Test Proceed as follows to test the Input A frequency measurement accuracy 1 2 Connect the test tool to the 5500A as for the previous test see Figure 4 3 Select the following test tool setup e Press to select auto ranging AUTO in top of display e Press S to open the INPUT A MEASUREMENTS menu and choose MEASURE on A W Hz Set the 5500A to source a leveled sine wave of 600 mV peak to peak SCOPE output MODE levsin Set the 5500A frequency according to the first test point in Table 4 1 Observe the Input A main reading on the test tool and check to see if it is within the range shown under the appropriate column Performance Verification 4 4 5 Input A and Input B Tests 6 Continue through the test points 7 When you are finished set the 5500A to Standby Table 4 1 Input A B Frequency Measurement A
52. indicate correct operating or maintenance procedures to prevent damage to or destruction of the equipment or other property Warning Calls attention to a potential danger that requires correct procedures or practices to prevent personal injury 1 4 Symbols IN Read the safety information in the Users Ii DOUBLE INSULATION Protection Class Manual Xy Equal potential inputs connected Static sensitive components internally black yellow 4 Live voltage 7 AN Recycling information Earth lt 7 Disposal information CE Conformit Europ enne 1 3 123 Service Manual 1 5 Impaired Safety Whenever it is likely that safety has been impaired the instrument must be turned off and disconnected from line power The matter should then be referred to qualified technicians Safety is likely to be impaired if for example the instrument fails to perform the intended measurements or shows visible damage 1 6 General Safety Information Warning Removing the instrument covers or removing parts except those to which access can be gained by hand is likely to expose live parts and accessible terminals which can be dangerous to life The instrument shall be disconnected from all voltage sources before it is opened Capacitors inside the instrument can hold their charge even if the instrument has been separated from all voltage sources Components which are important for the safety of the instrument may only be replaced
53. is completely charged again VGARVAL L Idle mode VGARVAL H Off mode TURN ON or MAINVAL H EE EEES AEE Flash ROM NOT OK Mask Active Mask StartUp OR mode Flash ROM OK M amp amp TURN ON TURN OFF Extern StartUp MAINVAL L amp TURN OFF or BATTVOLT lt 4V Software TURN ON amp BATTVOLT gt 4 amp MAINVAL L TURN OFF amp MAINVAL H MAINVAL H TURN OFF Charge Mode Operational Mode TURN ON amp BATTVOLT lt 4V Operational amp Charge Mode or AutoShutDown Battery refresh or TURN OFF TURN ON Figure 3 2 Fluke 123 Start up Sequence Operating Modes Table 3 2 shows an overview of the test tool operating modes Circuit Descriptions 3 3 3 Detailed Circuit Descriptions Table 3 2 Fluke 123 Operating Modes a SNE DU ERC Idle mode No power adapter and no No power adapter and no battery no activity Off mode No power adapter connected battery P ASIC 8 D ASIC powered installed test tool off VBAT 8 3V3GAR Mask active mode No valid instrument software or and gt key Mask software runs pressed when turning on Charge mode mode Power adapter connected and test tool off Batteries will be Batteries will be charged Operational 8 Power adapter connected and test tool on Test tool operational and Charge mode batteries will be charged Operational mode No power adapter connected battery Test tool operationa
54. me e e e n n e eee 9 14 9 9 Main PCA side 1 PCB version R 9 15 9 10 Main PCA side 2 PCB version R 9 16 Chapter 1 Safety Instructions Title Page IT Introduction iiie eo eI ade E ERE ENS 1 3 1 2 Safety Precautions oie rrr tret reete pei ee Fee tee Pee ce e Eo rio Pure en 1 3 1 3 Caution and Warning Statements esses 1 3 IE Symbols ase SER Gt E ues 1 3 1 5 Impaired Safety e it edere ae ida eee etas 1 4 1 6 General Safety Information enne 1 4 Safety Instructions 1 1 1 Introduction 1 1 Introduction Read these pages carefully before beginning to install and use the instrument The following paragraphs contain information cautions and warnings which must be followed to ensure safe operation and to keep the instrument in a safe condition Warning Servicing described in this manual is to be done only by qualified service personnel To avoid electrical shock do not service the instrument unless you are qualified to do so 1 2 Safety Precautions For the correct and safe use of this instrument it is essential that both operating and service personnel follow generally accepted safety procedures in addition to the safety precautions specified in this manual Specific warning and caution statements where they apply will be found throughout the manual Where necessary the warning and caution statements and or symbols are marked on the instrument 1 3 Caution and Warning Statements Caution Used to
55. on Cx to OV Averaging the results of both measurements cancels the effect of a possible parallel resistance and suppresses the influence of mains interference voltages Table 3 5 shows the relation between the capacitance ranges the charge current and the pulse width at full scale 3 19 123 Service Manual Table 3 5 Capacitance Ranges Current and Pulse Width cure sya soo To protect the current source if a voltage is applied to the input a PTC resistor R172 and a protection circuit on the TRIGGER part are provided see Section 3 3 3 Frequency amp Pulse Width Measurements The input voltage is measured as described above From the ADC samples to built the trace also the frequency pulse width and duty cycle of the input signal are calculated Probe Detection The Input A and Input B safety banana jacks are provided with a ground shield consisting of two separated half round parts One half is connected to ground via the protection PTC resistor R106 R206 Via a 220K resistor installed on the input block the other half is connected to the probe input of the D ASIC pin 54 55 If the shielded STL120 test lead or a BB120 shielded banana to BNC adapter is inserted in Input A or Input B it will short the two ground shield halves This can be detected by the D ASIC Supply Voltages The 5VA 3V3A and 3V3A supply voltages are supplied by the Fly Back Converter on the POWER part The voltages are present only i
56. termination 1x ITT Pomona model 4119 75 e PM9093 001 Male BNC to Dual Female BNC Adapter 4 3 How To Verify Verification procedures for the display function and measure functions follow For each procedure the test requirements are listed If the result of the test does not meet the requirements the test tool should be recalibrated or repaired if necessary 4 3 123 Service Manual Follow these general instructions for all tests For all tests power the test tool with the PM8907 power adapter The battery pack must be installed Allow the 5500A to satisfy its specified warm up period For each test point wait for the 5500A to settle Allow the test tool a minimum of 20 minutes to warm up 4 4 Display and Backlight Test Proceed as follows to test the display and the backlight 1 2 SIS v AGE a n Press K TO TURN THE Test tool on Press ES and verify that the backlight is dimmed Then select maximum backlight brightness again Remove the adapter power and verify that the backlight is dimmed Apply the adapter power and verify that the backlight brightness is set to maximum Press and hold ES Press and release Release ES The test tool shows the calibration menu in the bottom of the display Do not press now If you did turn the test tool off and on and start at 5 Press 25 PREV three times The test tool shows Contrast CL 0100 MANUAL Press 39 CAL The test tool shows a dark displa
57. the 1 23V reference source V301 via R307 The 3 3V REFPWM2 voltage is used as reference for the PWMB outputs of the D ASIC on the Digital part The 1 23V REFP voltage is used as main reference source for the reference circuit This circuit consists of four amplifiers in the T ASIC external gain resistors and filter capacitors Amplifier 1 and connected resistors supply the REFPWMI reference voltage This voltage is a reference for the PWMA outputs of the D ASIC on the Digital section It is also used as reference voltage for the LCD supply on the LCD unit Amplifier 2 and connected resistors supply the 1 23V REFN reference voltage used for the trigger level voltages TRIGLEV1 amp 2 the C ASIC POS A and POS B voltages and the C ASIC OFFSET A and OFFSET B voltages REFN is also the input reference for amplifiers 3 and 4 Circuit Descriptions 3 3 3 Detailed Circuit Descriptions Amplifier 3 and 4 and connected resistors supply the REFADCT and REFADCB reference voltages for the ADC s Both voltages directly influence the gain accuracy of the ADC s The T ASIC can select some of the reference voltages to be output to pin 8 REFATT The REFATT voltage is used for internal calibration of the input A and B overall gain Tracerot Signal The T ASIC generates the TRACEROT signal used by the C ASIC s Control signals TROTRST and TROTCLK are provided by the D ASIC AC DC Relay and Q F Relay Control The Channel A B AC DC relays K1
58. the METER A OPTIONS MENU and choose SMOOTHING M NORMAL ZERO REF M ON The ZERO REF function is used to eliminate the capacitance of the test leads Set the 5500A to the first test point in Table 4 9 Use the 5500A COMP OFF mode Observe the Input A main reading and check to see if it is within the range shown under the appropriate column Continue through the test points When you are finished set the 5500A to Standby Remove all test leads from the test tool to check the zero point Press Ea to open the INPUT A MEASUREMENTS menu Press E the select the METER A OPTIONS MENU and choose SMOOTHING M NORMAL ZERO REF M OFF 10 Observe the Input A reading and check to see if it is between 00 00 and 00 10 nF Performance Verification 4 4 5 Input A and Input B Tests Table 4 9 Capacitance Measurement Verification Points 39 10 to 40 90 300 nF 293 0 to 307 0 30 uF 29 30 to 30 70 293 0 to 307 0 0 00 00 to 00 10 remove test tool input connections see steps 7 10 4 5 19 Video Trigger Test Only one of the systems NTSC PAL or SECAM has to be verified Proceed as follows 1 Connect the test tool to the TV Signal Generator as shown in Figure 4 8 TV SIGNAL GENERATOR E S 750 BB120 ST8141 CGM Figure 4 8 Test Tool Input A to TV Signal Generator 2 Select the following test tool setup e Reset the test tool power off and then on with ES e Press se to open the SCOPE INPUTS m
59. the Maintenance mode Press NO Now press until the display shows WarmingUp CL 0200 IDLE and calibrate the test tool starting at Section 5 5 e Toexit and save the INVALID calibration data Press YES The test tool will show the message The test tool needs calibration Please contact your service center at power on The calibration date and number will not be updated A complete recalibration must be done e To exit and maintain the old calibration data Turn the test tool off WARNING No adapter present Calibration data will not be saved Exit maintenance mode e To save the calibration data Press NO The test tool returns to the maintenance mode Then supply the correct adapter input voltage and press to exit and save e To exit without saving the calibration data Press YES Chapter 6 Disassembling the Test Tool Title Page Gok TOHO UCA ia 6 3 6 2 Disassembling Procedures sss sese eee 6 3 6 1 T Required TOMS iii err t ae the rt tare 6 3 6 2 2 Removing the Battery Pack sees eee 6 3 0 2 3 Removing the Ball feiss eee eee eem Pee eee eene 6 3 6 2 4 Opening the Test Tool ener nennen 6 3 6 2 5 Removing the Main PCA Uhnit esses 6 5 6 2 6 Removing the Display Assembly 6 6 6 2 7 Removing the Keypad and Keypad Foil sss 6 6 6 3 Disassembling the Main PCA Unites eee eee 6 6 6 4 Reassembling the Main PCA Unit sese eee eee 6 8 6 5 Reassembling the Test Tool 6
60. via Power Adapter PM8907 10 to 21V DC 5W typical 5 mm jack Rechargeable Ni Cd 4 8V 4 hours with bright backlight 5 hours with dimmed backlight 4 hours with test tool off 12 hours with test tool on 12 hours with refresh cycle 0 to 45 C 32 to 113 F 2 10 232 x 115 x 50 mm 9 1 x 4 5 x 2 in 1 1 kg 2 5 Ibs including battery pack 2 9 123 Service Manual Interface RS 232 optically isolated To Printer supports Epson FX LQ and HP Deskjet Laserjet and Postscript Serial via PM9080 optically isolated RS232 adapter cable optional Parallel via PAC91 optically isolated print adapter cable optional To PC Dump and load settings and data Serial via PM9080 optically isolated RS232 adapter cable optional using SW90W FlukeView software for Windows 2 5 Environmental Environmental MIL 28800E Type 3 Class III Style B Temperature Operating 0 to 50 C 32 to 122 F Storage 20 to 60 C 4 to 140 F Humidity Operating 0 to 10 C 32 to 50 F noncondensing 210 to 30 C 50 to 86 F 95 30 to 40 C 86 to 104 F 75 240 to 50 C 104 to 122 F 45 Storage 20 to 60 C 4 to 140 F noncondensing Altitude Operating 4 5 km 15 000 feet Max Input and Floating Voltage 600 Vrms up to 2 km linearly derating to 400 Vrms 4 5 km Storage 12 km 40 000 feet Vibration max 3g Shock max 30g Fungus Resistance MIL28800E Class 3 3 7 7 amp 4 5 6 1 Salt Exposure M
61. 0 2 6 Service and Maintenance sese ee eee eee 2 11 2 4 Safety ak a T 2 11 2 8 EMC IMMUNITY idad code tees eee ret red Ere eee eae ea reae 2 12 3 Circuit Descriptiolis 2 12 snis oct ida cit 3 1 3 1 Introductioti aee epe e erre e oon th er ER 3 3 3 2 Block Diagram sss 3 3 3 2 1 Channel A Channel B Measurement Circuits eee 3 4 3 2 2 Trigger ET Cu hieu id cere rt tt I ee end 3 4 3 23 Digital Circuit iet Se eter eme ete eee 3 5 3 2 4 POWerCIECUIU ssi eee deett Pie ERE e bee Pee eee DEAS 3 6 3 2 5 Start up Sequence Operating Modes sese 3 7 123 Service Manual 3 3 Detailed Circuit Descriptions sss sese eee 3 9 3 3 POWER E LTTE 3 9 3 3 2 Channel A Channel B Measurement Circuits sess 3 15 3 3 3 Trigger Cll pee ede A e eee 3 20 3 3 4 Digital Circuit ir ee ee ter dt a Hee e 3 25 Performance Verification cccccccccccccccccccccccccnccnoconocononononcnnnonononos 4 1 A TN 4 3 4 2 Equipment Required For Verification sese eee eee 4 3 43 How R tet eer rer er ertet ie a He to AUI ENS 4 3 4 4 Display and Backlight Test sees 4 4 4 5 Input A and Input B Tests sss sese 4 5 4 5 1 Input A and B Base Line Jump Test 4 6 4 5 2 Input A Trigger Sensitivity Test 4 7 4 5 3 Input A Frequency Response Upper Transition Point Test 4 8 4 5 4 Input A Frequency Measurement Accuracy Test sese eee 4 8 4 5 5 Input B Frequency Measurement Accuracy Test seus 4 9 4 5
62. 0 2 The Slow ADC works according to the successive approximation principle The D ASIC changes the SADCLEV signal level and thus the voltage level on pin 3 of the comparator step wise by changing the duty cycle of the PWM signal SADCLEVD The comparator output SLOWADC is monitored by the D ASIC who 3 13 123 Service Manual knows now if the previous input voltage step caused the comparator output to switch By increasing the voltage steps the voltage level can be approximated within the smallest possible step of the SADCLEV voltage From its set SADCLEVD duty cycle the D ASIC knows voltage level of the selected input RS232 The optical interface is used for two purposes e enable serial communication RS232 between the test tool and a PC or printer e enable external triggering using the Isolated Trigger Probe ITP120 The received data line RXDA P ASIC pin 75 is connected to ground via a 20 kQ resistor in the P ASIC If no light is received by the light sensitive diode H522 the RXDA line is 200 mV which corresponds to a 1 43V on the RXD P ASIC output pin 76 line If light is received the light sensitive diode will conduct and the RXDA line goes low 0 0 6V which corresponds to a 0 on the RXD line The level on the RXDA line is compared by a comparator in the P ASIC to a 100 mV level The comparator output is the RXD line which is supplied to the D ASIC for communication and for external triggering T
63. 14 91 ss3duaav Act A 39044 8 90 SNE NMAA Tvno5lHl MIOdls 34001710H DlBlTIV 1d9iHl v oav Ssnaoavs E diN31 q21 eSvx WMd WANS suani moans y v oav sna a97 3AZINOGNVY HE l auvogax4 TWLISIG IHOlDIOVH lSVHINOO LINN G91 SAOVLIOA TWAOSTEL Lsarova 3ON383338 MIOS vas 330010H OS OMI LOSI 4 0 vWHO CA319IHL LA319I81L 497000 9ISV 4399IHL 1NON39 NOILO310Hd AEZ H d43d A ene ZWMd43H uo1vuvdas asind ONAS 439914 1NON39 1vas XIOS SIS3IOVG 8 380H8d 4 j 8 TANNVHO ore 8520 DO OISV T3NNVHO En 3H vas VLSALOVG 7 VOI 35N3S ggz0 00 aao SY V13930 13NNVHO V SOd v oav 6 Old Y 380Hd 2 Sa LNdNI Old WOO Old a o V LfidNI V 1ANNVHO ST7965 EPS Figure 3 1 Fluke 123 Block Diagram 3 2 Circuit Descriptions 3 3 1 Introduction 3 1 Introduction Section 3 2 describes the functional block diagram shown in Figure 3 1 It provides a quick way to get familiar with the test tool basic build up Section 3 3 describes the principle of operation of the test tool functions in detail
64. 2 122 33082 5322 122 33082 4822 122 31202 4822 126 12342 5322 122 32287 5322 122 32452 5322 122 32268 5322 126 10223 5322 126 10511 5322 126 10511 5322 126 10511 5322 122 34098 4822 122 33128 5322 122 32654 5322 126 10511 5322 122 33538 5322 122 32531 5322 126 13638 5322 122 32287 5322 124 11837 5322 126 13638 5322 124 11837 5322 126 13638 5322 126 13638 5322 124 11837 5322 126 13638 8 123 Service Manual Ordering Code Remarks Reference Description Designator C289 C290 C291 C301 C303 C306 C311 C312 C313 C314 C317 C321 C322 C331 C332 C333 C337 C339 C342 C344 C356 C357 C376 C377 C378 C379 C381 C382 C391 C392 C393 C394 C395 CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF ALCAP SANYO 25V 20 10UF ALCAP SANYO 25V 20 10UF ALCAP NICHICON 6 3V 20 22UF CER CHIP CAP 63V 10 1 5NF CER CHIP CAP 63V 10 1 5NF CER CHIP CAP 63V 0 25PF 4 7PF CER CHIP CAP 63V 5 22PF CER CHIP CAP 63V 0 25PF 1PF CER CHIP CAP 63V 0 25PF 4 7PF CER CHIP CAP 63V 0 25PF 1PF CER CHIP CAP 63V 0 25PF 1PF CER CHIP CAP 63V 5 22PF CER CHIP CAP 63V 10 18NF CHIPCAP X7B 0805 10 22NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPC
65. 21 and H522 1 2 3 X100 B401 B402 B403 C101 C102 C104 C105 C106 C107 C111 C112 C113 C114 C116 C117 C118 C119 C121 C122 C123 C124 C131 Screw for Input Banana Jack Assembly Input Banana Jack Assembly without Input A B and COM O rings see Figure 8 2 including rersistors R1 and R2 QUARTZ CRYSTAL 32 768KHZ SEK QUARTZ CRYSTAL 16 0MHZ KDK QUARTZ CRYSTAL 25 0MHZ KDK MKC FILM CAP 630V 10 SUPPR CAPACITOR 0 1 UF CER CAP 3 15KV 5 ALCAP NICHICON 16V 10UF CER CAP 1KV 20 80 4 7NF CER CHIP CAP 63V 5 470PF CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CAP 1 500V CER CHIP CAP 63V 0 25PF 0 82PF 0 25PF 4 7PF 0 25PF 4 7PF 0 25PF 4 7PF 0 25PF 4 7PF 0 25PF 4 7PF 2 10PF 0 25PF 4 7PF 0 25PF 4 7PF 2 33PF 0 25PF 4 7PF 0 25PF 4 7PF 2 33PF 22NF 120PF 5322 255 41213 5322 502 14362 5322 264 10311 5322 242 10302 5322 242 10573 5322 242 10574 5322 121 10616 5322 121 10527 5322 126 14046 5322 124 41979 5322 126 13825 5322 122 32268 5322 122 33082 5322 122 33082 5322 122 33082 5322 122 33082 5322 122 33082 4822 122 31195 5322 122 33082 5322 122 33082 4822 122 31202 5322 122 33082 5322 122 33082 4822 122 31202 5322 126 10786 8 123 Service Manual Ordering Code Remarks Reference Description Designator C132 C133
66. 3 F2 R497 C5 4 G15 V353 R238 A1 2 E3 R390 B3 3 B10 R499 B4 4 J13 V354 R239 A1 2 E3 R393 A3 3 G3 R501 A4 5 E3 V356 R240 A1 2 E4 R394 A3 3 G3 R502 A4 5 F5 V358 R241 A2 2 E3 R395 A3 3 G2 R503 A5 5 E6 V359 R242 B2 2 E3 R396 A3 3 G3 R504 C5 5 C4 V395 R243 B2 2 E4 R398 A3 3 G3 R506 C5 5 C4 V403 R246 B2 2 E5 R403 C3 4 A3 R507 C5 5 C5 V471 R251 B2 2 C8 R404 D3 4 A11 R508 B4 5 B4 V482 R252 B2 2 C8 R405 D4 4 G2 R509 AS 5 C5 V495 R253 B2 2 D8 R406 D4 4 G2 R512 A5 5 C5 V501 R254 B2 2 D8 R407 D4 4 G2 R513 A5 5 G3 V503 R255 B2 2 D7 R408 D3 4 G2 R514 A5 5 G3 V504 R256 A3 2 D8 R409 C3 4 F3 R516 A5 5 G4 V506 R257 A3 2 D7 R410 D3 4 G3 R524 AS 5 G15 V550 R258 B3 2 E7 R416 C5 4 A12 R527 A3 5 J9 V551 R259 B3 2 E7 R417 D3 4 A11 R528 A4 5 H7 V554 R260 A2 2 D7 R431 C4 4 D3 R529 A3 5 J8 V555 R261 A3 2 D7 R432 C3 4 D3 R531 B4 5 K6 V561 R271 B3 3 E12 R433 C3 4 E3 R532 B4 5 K6 V562 R282 A3 2 A7 R434 C4 4 E3 R534 A4 5 G6 V563 R284 A2 2 A8 R436 B4 4 F3 R535 A4 5 G8 V564 R286 B3 2 B7 R438 B4 4 E3 R550 A5 5 D12 V565 R288 A3 2 B7 R439 B3 4 E3 R551 B5 5 E12 V566 R289 B2 2 B8 R441 B4 4 E3 R552 A5 5 E16 V567 R301 C3 3 D6 R442 B4 4 E3 R553 A5 5 E16 V569 R302 C3 3 E6 R453 B3 4 13 R554 A5 5 E15 V600 R303 C3 3 E6 R454 B3 4 A11 R558 A5 5 F10 V601 R305 C3 3 D6 R466 C5 4 A12 R559 A5 5 F10 V602 R307 D4 3 F8 R467 B3 4 B11 R563 A5 5 F15 V604 R308 D3 3 F6 R469 B4 4 J12 R564 A5 5 F15 V605 R309 C3 3 G6 R470 BS 4 B12 R565 AS 5 F14 R310 C3 3 E6 R471 B4 4 H7 R570 B5 5
67. 4 ADCBS vop 113 VD 4 B11 RAM S ADCB BUS 45 apcea Ramais M2 RAM A15 cing L B11 amp 47 VDD RAMA16 111 RAM_A16 100n ADC B D3 I abis RAMA17 110 RAM A17 ADG B D2 Fo ADCB3 RAMA 8 109 RAM A18 RAM_ADDR i e a 1 CRDI ADCB2 Rxp2 108 RXD2 5 16 2000 ADC CHANNEL B ae 50 apcet Txp2 107 TXD2 a ed ad ADC_B_DO 51 ApCBO 106 q MS447 L C409 VDDDB A10 NC 82 No emuL 108 F 22n b SUPPRDET 112 Oo Asc wg are NC R498 R497 VDDO m id 95 94 do096556 128x8 open 0E E PRS PAB 1811 SS BB 258232 onanygdkk EE EE CELZOR RIO R491 256x8 open OE C457 C458 R471 R472 og9aS666666829ddddooe9980X oxxaoorcaocza orougooso uoaiuoo 51K1 512x8 0E open L C466 100n 100n 4M 4M Cro PP SOS BOSS SO RS Bae Ba ROOM RRR S FETTERE P 100n 38 8 6 i5 SESSAD I PC PRIN re IS oo 0d eS od od 0D js 3 ojo gt Bs S a o o 9 a ls gt SS NC 5 in else ie Nc L Enda PROBE_A z 9 lo 6 2 2 PROBE 1E3 pnogE B a Biz lo SERO H bis VODA VDDD VbDO 14 ADC_B_DO ve i e Ozee Go Seer peg DO 2 TP471 8 4 ceo g ZSS i R486 R487 2D10 g ADC B 5 vin p1 15 ADC_B_D1 SCLK RSS 3 e e SREEOEESOoES damsel a p2 16 ADC B D2 qx mur e lm a 100 F FeR ZARE Bana bd 10K 10K d i im l REFADCT 8 vet pa 117 ADC B D3 SCLK SDAT SDAT e TP472 8 l PCA Version Detect peed D451 pa 18 ADC_B_D4 BATA amp zx z not for PCB lt 8 TP496 TP495 p 9 VRM D5 ADC B DS F8 Cabs cai
68. 503 pins 3 and 5 check connections to N501 3 N501 pin 6 IMAXCHA for 150 mV If not correct check R514 and connections to N501 4 N501 pin 7 VBATHIGH for 1 2V If not correct check R513 and connections to N501 Steps 1 to 4 verify that N501 supplies a 47 UA current to each of the resistors R512 battery NTC R514 and R513 5 Check N501 pin 9 for the same voltage as on X503 pin 3 sense resistors R504 R506 and R507 6 If 1 to 5 above correct then N501 is defective Connect TP531 for a short time max 1 minute to ground and see if the FET gate TP502 now shows a 100 kHz pulse signal If it does not continue at step 7d If it does the CHARCURR control signal is not correct continue at step 7c Check the CHARCURR control signal 7 5 123 Service Manual 7 6 The CHARCURR voltage on TP531 is controlled by a pulse width modulated voltage CHARCUR from the D ASIC D471 pin 40 The D ASIC measures the required signals needed for control via the Slow ADC 1 Check the SLOW ADC see Section 7 5 3 2 Check VGARVAL N501 pin 64 for 3 3V If not correct check if the line is shorted to ground If it is not then replace N501 3 Trace the CHARCURR signal path to R534 R 442 and D471 D ASIC output pin 40 d Check the following 1 C506 and connections to N501 2 Connections between V506 and N501 pin 16 CHAGATE 3 The voltage at TP501 N501 pin 19 VCHDRIVE for 15 20V 4 The voltage
69. 52 OFFSET B for about 1 1V Check TP303 REFN for 1 2V Check TP153 DACTESTA and TP253 DACTESTB for OV If TP153 is 1 7V the C ASIC is in the reset state 200 mV div fixed sensitivity check SDAT and SCLK see step 15 Check TP155 MIDADCA and TP255 MIDADCB for about 0 9V Press EJ to open the SCOPE INPUTS menu Press 373 to open the SCOPE OPTIONS menu and select SCOPE MODE M NORMAL WAVEFORM MODE M NORMAL Select a time base of 20 ms div Corrective Maintenance T 7 5 Miscellaneous Functions 13 Check TP258 TRACEROT supplied by T ASIC N301 for the signals shown below typical example at 20 ms div 0 8V 0 8V A 100 E Son If not correct check TP432 RAMPCLK for 3V 200 ns pulses TP332 RAMPCLK for 0 6V 200 ns pulses TP331 RSTRAMP for 3V pulses with varying pulse with and repetition rate All pulses are supplied by D ASIC D471 14 Check TP310 REFATT for alternating 1 2V and 1 2V pulses The repetition frequency depends on the time base and is for example 500 ms at 20 ms div 15 Check the SCLK and SDAT lines for 3 3V pulse bursts C ASIC pin 25 and 26 16 Check TP437 Sample clock for a 5 MHz time base 2 10 ms div or 25 MHz clock signal 3 3V 17 Check TP301 REFADCT for 1 62V and TP302 REFADCB for 0 12V 18 Check the ADC supply voltages VDDAA VDDDA VDDBB VDDDB and VDDO for 3 3V 19 Check TP401 and TP451 for OV 7 5 7 Channel A Ohms and Capacitance Mea
70. 531 N600 R1 R2 R101 R102 R103 R104 R105 R106 R108 R109 R110 R111 R112 R113 R114 R116 R117 R118 FIXED INDUCOR 68UH 10 TDK FIXED INDUCOR 68UH 10 TDK CHIP INDUCT 47UH 10 TDK FIXED INDUCOR 68UH 10 TDK SHIELDED CHOKE 150UH TDK C ASIC 0Q0258 C ASIC 0Q0258 T ASIC OQ0257 P ASIC OQ0256 LOW POW OPAMP LMC7101BIM5X NSC LAMP CONTROLLER UC3872DW UNI MTL FILM RST VR25 5 220K 0 25W MTL FILM RST VR25 5 220K 0 25W MTL FILM RST MRS25 1 487K MTL FILM RST MRS25 1 487K RESISTOR CHIP RC12H 1 1M RESISTOR CHIP RC12H 1 26K1 RESISTOR CHIP RC12H 1 511E PTC THERM DISC 600V 300 500E RESISTOR CHIP RC12H 1 511E RESISTOR CHIP RC12H 1 2K15 RESISTOR CHIP RC12H 1 2K15 RESISTOR CHIP RC11 2 10M RESISTOR CHIP RC11 2 10M RESISTOR CHIP RC11 2 10M RESISTOR CHIP RC11 2 10M RESISTOR CHIP RC12H 1 215E RESISTOR CHIP RC12H 1 215E RESISTOR CHIP RC12H 1 68E1 5322 157 10995 5322 157 10995 4822 157 70794 5322 157 10995 5322 157 10996 5322 209 13141 5322 209 13141 5322 209 13142 5322 209 13143 5322 209 15144 5322 209 14851 4822 053 20224 4822 053 20224 4822 050 24874 4822 050 24874 4822 117 11948 5322 117 12448 5322 117 12451 5322 116 40274 5322 117 12451 5322 117 12452 5322 117 12452 4822 051 20106 4822 051 20106 4822 051 20106 4822 051 20106 5322 117 12453 5322 117 12453 5322 117 12454 8 123 Service Manual Ordering Code Remarks Reference Description Designator R119 R120 R121
71. 7 12491 5322 117 12456 5322 117 12457 5322 117 12458 5322 117 12485 5322 117 12485 5322 117 12458 5322 117 12459 5322 117 12485 5322 117 12456 5322 117 12461 4822 117 11373 5322 117 12462 5322 117 12485 4822 117 11373 5322 117 12456 5322 116 40274 5322 117 12456 5322 117 12464 Ordering Code List of Replaceable Parts 8 5 Main PCA Parts Remarks Reference Description Designator R184 R186 R188 R189 R201 R202 R203 R204 R205 R206 R208 R209 R210 R211 R212 R213 R214 R216 R217 R218 R219 R220 R221 R225 R231 R232 R233 R234 R236 R237 R238 R239 R240 RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RC12H 1 RC12H 1 RC12H 1 RC12H 1 10E 10E 10E 10E MTL FILM RST MRS25 1 487K MTL FILM RST MRS25 1 487K RESISTOR CHIP RC12H 1 1M RESISTOR CHIP RC12H 1 26K1 RESISTOR CHIP RC12H 1 511E PTC THERM DISC 600V 300 500E RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RC12H 1 RC12H 1 RC12H 1 RC11 2 RC11 2 RC11 2 RC11 2 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC11 2 RC12H 1 RC12H 1 RC12G 1 RC12G 1 RC12G 1 RC12G 1 RC 02G 1 RC 02H 1 RC 02H 1 RC 02H 1
72. 71 K271 and the Channel A Q F relay K173 are controlled by the T ASIC output signals ACDCA pin 22 ACDCB pin 23 and OHMA pin 24 SCLK SDAT Signals T ASIC control data e g for trigger source mode edge selection and relay control are provided by the D ASIC via the SCLK and SDAT serial control lines 3 3 4 Digital Circuit See the Fluke 123 block diagram Figure 3 1 and circuit diagram Figure 9 4 The Digital part is built up around the D ASIC MOT0002 It provides the following functions e Analog to Digital Conversion of the conditioned Input A and Input B signals e ADC data acquisition for traces and numerical readings e Trigger processing e Pulse width measurements e g for capacitance measurement function e Microprocessor Flash EPROM and RAM control e Display control e Keyboard control ON OFF control e Miscellaneous functions as PWM signal generation SDA SCL serial data control probe detection Slow ADC control serial RS232 interface control buzzer control etc The D ASIC is permanently powered by the 3 V3GAR voltage The P ASIC indicates the status of the 3 V3GAR voltage via the VGARVAL line connected to D ASIC pin 89 f 3 V3GAR is correct VGARVAL is high and the D ASIC will start up as a result the D ASIC functions are operative regardless of the test tool is ON OFF status Analog to Digital Conversion For voltage and resistance measurements the Input A B B for voltage only signal is conditioned
73. 800VP 120 The part number of D474 has not been changed Revision 14 A new version of the Printed Circuit Board PCB is used in the Main PCA The version of the PCB is the last digit of the 12 digit number on the PCB edge near N501 The new version 12 digit code is 4022 245 0443 8 version 8 The part number of the Main PCA has not changed Old and new PCA versions are fully compatible See Section 9 for the circuit diagrams and the parts location drawings of the old and new version PCB The following changes have been made In the Backlight Converter circuit R605 and R606 are added to provide a more reliable start up of the backlight See the Power Circuit diagram figure 9 6 The 12 V program voltage 12VPROG from N501 pin 22 to D474 pin 13 and the RESET ROM circuit have been removed See the Digital Circuit diagram figure 9 4 and the Power Circuit diagram figure 9 6 A delay circuit for the Rom Write Enable end edge has been added D480 and related parts between D471 pin 149 ROMWR and FlashROM D474 pin 11 ROMWRITE The delay is required to make the circuit suitable for FlashROMs that need a large delay between the write data and the write enable end See the Digital Circuit diagram figure 9 4 Capacitor C476 was missing in the Digital Circuit diagram and has been added near C474 Another shape for the 4041 reference diode is used The shape was a 2x4 pin DIL mounted on the Main PCA side 2 reference designator V301 Th
74. ADCB GAINADCB GNDRDAC 49 GAINADCT VEU F GAINPWM vccaRAMP 48 VCC3RAMP r F5 V172 REFADCT GNDRAMP 47 BCV65 REFADCB 53 REFADCB VEERAMP 46 VEERAMP 165 REEPWMT 55 REFPWM GNDCML 43 R331 16 H 7 S Rag I DACTESTT 29 pactest RSTRAMP 45 le poc RSTRAMP il x i 4 E14 22Lo avatso E I C332 i C331 R271 S222 S520065600 4p7 K271 TP309 ExO0IRODODAREQOL 22p p 348E sva R375 VCC5REF sou23r 242087223 e 3V3A 5816 amp D8 BOSOOLOSHZOLSZLGe le NCCSDT GAINADCB e ele ln leke l leo lale le lo TP332 ceo ex e sr tN Jon fon Jon OO OO mI SDAT S RAMPCLK 4 17 O G eo D D G Re VCC3ATR nu 4 17 ELER gt gt E TRIGDT TRACEROT 1 E10 5 C16 D11 m 2 810 io Lo 5 016 3 8 e TP311 D11 GAINREFN D8 TP306 TP336 105 VCC3CML E9 R337 ji l REFPWM2 I5 j7 HOLDOFF C377 L C376 C344 C337 100n 100n 100n 100n T 100n R307 T 22p 4p TP304 TP307 10K U R339 b SMPCLK R393 VEEATR cai REFPWM1 REFP 47 R394 c317 4 E 1 VEEDT C311 V301 v302 p LT D11 R312 R311 C312 R395 R396 s 220 aaka sai 100n doo A 4041 ZA 4041 rss Lp 3V3A VEERAMP 5 C16 pe gt E11 R342 TRIGQUAL VEEREF cud D8 SAINFWM E Du C391 C342 100n V301 OR V302 1p Ea pa See Ch 10 Rev 14 m C398 C397 C396 C394 Lb C393 pes pu I qu 100n REF BUS cn DTRG_BUS 1 D10 1 F4 4 05 210 2 3 4 02 4C7 4 66 4 31 ST8088 2 00 01 12 ST8088 2 WMF Figure 9 3 Circuit Diagram 3 Trigger Circuit 123
75. AP 25V 20 100NF ALCAP NICHICON 16V 10UF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIP CAP 25V 20 47NF 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 124 11838 5322 124 11838 4822 124 80675 5322 122 31865 5322 122 31865 5322 122 32287 5322 122 32658 5322 122 32447 5322 122 32287 5322 122 32447 5322 122 32447 5322 122 32658 5322 126 14044 5322 122 32654 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 124 41979 5322 126 13638 5322 126 13638 5322 126 14045 Ordering Code List of Replaceable Parts 8 5 Main PCA Parts Remarks Reference Description Designator C396 C397 C398 C399 C400 C401 C402 C403 C404 C407 C408 C409 C416 C431 C432 C433 C434 C436 C438 C439 C441 C442 C451 C452 C453 C457 C458 C463 C464 C465 C466 C470 C471 CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CHIPCAP X7B 0805 10 22NF CER CHIP CAP 63V 0 25PF 4 7PF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIP CAP 63V 5 470PF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CHIPCAP X7B 0805 10 22NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CHIPCAP X7B 0805 10 22NF CHIPCAP X7B 0805 10 22NF CER CAP X5R 1206 10 1UF CER CHIP CAP 63V 10 4 7NF CER
76. ASENSP CHASENSN pin 14 and 15 to the voltage on R514 IMAXCHA pin 6 It limits the input current e g when loading C503 and C555 just after connecting the power adapter via its internal Control circuit 123 Service Manual CHAGATE control signal To make the FET conductive its Vgs gate source voltage must be negative For that purpose the CHAGATE voltage must be negative with respect to VCHDRIVE The P ASIC voltage VCHDRIVE also limits the swing of the CHAGATE signal to 13V VCHDRIVE V506 OFF V506 ON VCHDRIVE 13V A 10 us Figure 3 4 CHAGATE Control Voltage 3V3GAR Voltage When the test tool is not turned on the Fly Back Converter does not run In this situation the 3 V3GAR voltage for the D ASIC the FlashROM and the RAM is supplied via transistor V569 The voltage is controlled by the VGARDRV signal supplied by the P ASIC pin 69 The current sense voltage across R580 is supplied to pin 70 VGARCURR The voltage 3 V3GAR is sensed on pin 66 for regulation The internal regulator in the P ASIC regulates the 3 V3GAR voltage and limits the current Fly Back Converter When the test tool is turned on the D ASIC makes the PWRONOFF line P ASIC pin 62 high Then the self oscillating Fly Back Converter becomes active It is started up by the internal 100 kHz oscillator that is also used for the Charger Converter circuit First the FLYGATE signal turns FET V554 on see Figure 3 5 and an incre
77. B R431 POS B D ADC ADE 3 ADCA7 IO9EXDTA 155 TLON ZK TP431 Re ADC AD 31 ADCAS EXTMAO 154 DEBUG2 OFFSET_B R432 OFFSETBD e ADC A DA 5 ics D16CSO 13 ROM_CSO Direct connections for PCB version 8 COR e HA R e Et nG EAS a D16CS1A18 l TRIGLEV1 R433 TRGLEVID 1 RANDOMIZE HOLDOFF B11 pao A VDD Diecs2a1g 151 Dotted connections and parts for PCB version lt 8 i TRT ee e ADO RDS E vss ROMRD 150_ROMREAD UI et ede en E TRIGLEV2 RA TRGLEV2D a ADCA3 ROMWR 39 ROMWR i H2VPROG TATK HO OUT ADCA D 9 ADCA2 vss Ln V482 5 810 w lt 72772 gi OFFSET_A R438 OFFSETAD ADC A DO L ADCA1 voD 147 vo pu TR487 BATS4S pg ND IK AT TI apcao romrst 146 ROMRST edes Reis L POS_A R439 POS AD B1 e VCLAMPA 108 145 DACTESTT A EIU ee ae rr pyra a vian HOLDOFF so our y HOLDOFF RAMD 144 RAM_D7 BEB SADCLEV R441 SADCLEVD TP482 R480 X BAs16 x DIGHO ramos 143 RM De R481 R483 C476 10K c HO IN 15 10K 100K 100i ORIG c os SAMPER 15 HOSCHMIN Ramps 142 RAM D5 n CHARCUR R442 CHARCURI TION VD a7 ROTCLK Ramps 144 RAM_D4 RAM_DATA TKaT HO IN SMPCLK 811 e 751 VDD RAMD3 140 RAM_D3 B C431 C433 C439 C442 SMPCLK k YSS D471 RAMD2 139 RAM_D2 100n 22n 4n7 22n iu 0 20 EE RAMD1 E RAM DT D475 oe TP483 118 ALTRIG o 21 ALLTRIG Ramo 187 L GA MSMSI008 TE THIGUT DO8CSO L RAM A1 Tla ogl 32 READRAM C432 C438 C441 TRIGQUAL 7 23 IRIGDT Dogcs1 135 DEBUG1 RAM_A09 2 A9 A10 31 RAMAT 100n 4n7 22n R478 HO_RNDM RSTRAMP 7 TRIGQUAL Doscs2 134 NC RAM
78. B VDC e Press TRER to open the INPUT B MEASUREMENTS menu and choose INPUT B M ON MEASURE on B W VDC s Using change the time base to select manual time base ranging and lock the time base on 10 ms div e Press to open the SCOPE INPUTS menu e Press to open the SCOPE OPTIONS menu and choose SCOPE MODE M NORMAL WAVEFORM MODE M SMOOTH e Move the Input A and Input B ground level indicated by zero icon WWW to the center grid line Proceed as follows Press to enable the arrow keys for moving the Input A ground level Press to enable the arrow keys for moving the Input B ground level Using the G amp keys move the ground level Using EM E set the Input A and B sensitivity to the first test point in Table 4 2 The corresponding range is shown in the second column of the table Set the 5500A to source the appropriate DC voltage Observe the main reading and check to see if it is within the range shown under the appropriate column Continue through the test points When you are finished set the 5500A to 0 zero Volt and to Standby Performance Verification 4 4 5 Input A and Input B Tests Table 4 2 Volts DC Measurement Verification Points Sensitivity Range 5500A output Input A B DC Reading Oscilloscope V DC 5 mV div 014 4 to 015 6 100 mV div 298 0 to 302 0 D The 500V and 1250V range will be tested in Section 4 5 14 Due to calibrator noise occasionally OL overload can be show
79. C ASIC OQ0258 The C ASIC is placed directly behind the input connector and transforms the input signal to levels that are suitable for the ADC and trigger circuits The C ASIC Figure 3 8 shows the simplified C ASIC block diagram The C ASIC consists of separate paths for HF and LF signals an output stage that delivers signals to the trigger and ADC circuits and a control block that allows software control of all modes and adjustments The transition frequency from the LF path to the HF path is approximately 20 kHz but there is a large overlap CHANNEL ASIC OQ 0258 ADC HF PATH OUTPUT STAGE TRIGGER LF PATH CONTROL SUPPLY INPUT GROUND PROTECT CAL POS BUS SUPPLY Figure 3 8 C ASIC Block Diagram 3 15 123 Service Manual LF input The LF input pin 42 is connected to a LF decade attenuator in voltage mode or to a high impedance buffer for resistance and capacitance measurements The LF decade attenuator consists of an amplifier with switchable external feedback resistors R131 to R136 Depending on the selected range the LF attenuation factor which will be set to 1 10 100 1000 10 000 The C ASIC includes a LF pre amplifier with switchable gain factors for the 1 2 5 steps HF input The HF component of the input signal is supplied to four external HF capacitive attenuators via C104 and R108 Depending on the required range the C ASIC selects and buffers one of the attenuator ou
80. C134 C136 C142 C145 C146 C148 C152 C153 C156 C158 C159 C161 C162 C181 C182 C183 C184 C186 C187 C188 C189 C190 C191 C199 C201 C202 C204 C205 C206 C207 C211 CER CHIP CAP 63V 0 25PF 4 7PF CER CHIP CAP 63V 5 47PF CER CHIP CAP 63V 5 470PF CER CHIP CAP 63V 10 4 7NF CHIPCAP NPO 0805 5 1NF CHIPCAP NPO 0805 5 1NF CHIPCAP NPO 0805 5 1NF CHIPCAP X7R 0805 10 10NF CERCAP X7R 0805 1096 15NF CHIPCAP X7B 0805 10 22NF CHIPCAP NPO 0805 5 1NF CER CHIP CAP 63V 5 150PF CHIPCAP NPO 0805 5 100PF CER CHIPCAP 25V 20 100NF CER CHIP CAP 63V 0 25PF 4 7PF ALCAP SANYO 10V 20 22UF CER CHIPCAP 25V 20 100NF ALCAP SANYO 10V 20 22UF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF ALCAP SANYO 10V 20 22UF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIP CAP 63V 5 470PF MKC FILM CAP 630V 10 22NF SUPPR CAPACITOR 0 1 UF CER CAP 3 15KV 4 599 120PF ALCAP NICHICON 16V 10UF CER CAP 1KV 20 80 4 7NF CER CHIP CAP 63V 5 470PF CER CAP 1 500V 0 25PF 4 7PF 5322 122 32287 5322 122 32452 5322 122 32268 5322 126 10223 5322 126 10511 5322 126 10511 5322 126 10511 5322 122 34098 4822 122 33128 5322 122 32654 5322 126 10511 5322 122 33538 5322 122 32531 5322 126 13638 5322 122 32287 5322 124 11837 5322 126 13638 5322 124 11837 5322 126 13638 5322 126 13638 5322 124 11837 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 122 32268
81. D5P06ET4 MOT RECT DIODE BYD77A RECT DIODE BYD77A N CHAN MOSFET 2SK974STR HIT RECT DIODE BYD77A SCHOTTKY DIODE MBRS340T3 MOT SCHOTTKY DIODE MBRS340T3 MOT SCHOTTKY DIODE MBRS340T3 MOT SCHOTTKY DIODE MBRS1100T3 MOT LF TRANSISTOR BC848C PEL LF TRANSISTOR BC848C PEL SCHOTTKY DIODE MBRS340T3 MOT LF TRANSISTOR BC869 PEL TMOS P CH FET MMSF3P03HD MOT TMOS N CH FET MMDF3NO2HD MOT SCHOTTKY DIODE MBRS340T3 MOT SIL DIODE BAS16 PEL N CHAN FET BSN20 PEL LF TRANSISTOR BC858C PEL FLEX PRINT CONNECTOR 15 P FCN FLEX PRINT CONNECTOR 21 P FCN DC POWER JACK HEC0739 01 010 MALE HEADER 2MM 6 P DBL RT ANG 5322 130 63289 5322 130 10669 5322 130 63289 9338 765 40115 4822 130 82262 5322 130 10669 5322 130 10674 5322 130 10674 5322 130 10674 5322 130 10671 5322 130 10763 5322 130 10763 5322 130 62921 5322 130 10763 5322 130 10674 5322 130 10674 5322 130 10674 5322 130 10675 5322 130 42136 5322 130 42136 5322 130 10674 4822 130 60142 5322 130 10672 5322 130 10673 5322 130 10674 5322 130 31928 5322 130 63289 4822 130 42513 5322 265 10725 5322 265 10726 4822 267 30431 5322 267 10501 8 8 23 123 Service Manual Remarks Reference Description Ordering Designator Code X601 MALE HEADER 7 P SNG RT ANG 5322 267 10502 EMI FILTER 50V 10A MUR 5322 156 11139 8 6 Accessory Replacement Parts Black ground lead for STL120 5322 320 11354 8 7 Service Tools Power Adapter Cable for calibration 5322 320 11707 see Se
82. Designator C609 C610 D401 D451 D471 D474 D475 D480 D531 H495 H521 H522 K171 K173 K271 L181 L182 L183 L281 L282 L283 L481 L501 L562 L563 CER CAP 2KV 5 33PF CER CAP X5R 1206 10 1UF LOW VOLT ADC TDA8792M C2 R1 LOW VOLT ADC TDA8792M C2 R1 D ASIC MOT0002 8M FEPROM AM29LV800B 120EC or HN29WT800T or M5M29FB800VP 120 or equivalent 128K8SRAM M5M51008AVP10VLL MIT 4X2 INP OR 74LVC32APW 8 INP MUX 74HC4051D PEL PE BUZZER PKM13EPP 4002 MUR IR LED SFH409 2 SIE PHOTODIODE OP906 OPT DPDT RELAY ASL 1 5W K B05 DPDT RELAY DSP1 L 1 5V MAT DPDT RELAY ASL 1 5W K B05 CHIP INDUCT 47UH 10 TDK CHIP INDUCT 47UH 10 TDK CHIP INDUCT 47UH 10 TDK CHIP INDUCT 47UH 10 TDK CHIP INDUCT 47UH 10 TDK CHIP INDUCT 47UH 10 TDK CHIP INDUCT 47UH 10 TDK CHOKE 33UH TDK CHIP INDUCT 47UH 10 TDK CHIP INDUCT 47UH 10 TDK 5322 126 14047 5322 126 14089 5322 209 14837 5322 209 14837 5322 209 13139 5322 209 15199 5322 209 14844 4022 304 10771 5322 209 61483 5322 280 10311 5322 130 61296 5322 130 10777 5322 280 10309 5322 280 10312 5322 280 10309 4822 157 70794 4822 157 70794 4822 157 70794 4822 157 70794 4822 157 70794 4822 157 70794 4822 157 70794 5322 157 10994 4822 157 70794 4822 157 70794 Ordering Code List of Replaceable Parts 8 5 Main PCA Parts Remarks Reference Description Designator L564 L566 L567 L569 L600 N101 N201 N301 N501 N
83. E 4 5 1 Input A and B Base Line Jump Test Proceed as follows to check the Input A and Input B base line jump 1 Short circuit the Input A and the Input B shielded banana sockets of the test tool Use the BB120 banana to BNC adapter and a 50Q or lower BNC termination Select the following test tool setup e Turn Input B on if not already on e Press auto to select auto ranging AUTO in top of display EA toggles between AUTO and MANUAL ranging e Press Ea to open the SCOPE INPUTS menu e Press EI to open the SCOPE OPTIONS menu and choose SCOPE MODE M NORMAL WAVEFORM MODE M SMOOTH Using toggle the time base between 10 ms div and 5 ms div the time base ranging is set to manual now the input sensitivity is still automatic no indication AUTO or MANUAL is displayed After changing the time base wait some seconds until the trace has settled Observe the Input A trace and check to see if it returns to the same position after changing the time base The allowed difference is 0 04 division 1 pixel Observe the Input B trace for the same conditions ER Using toggle the time base between 1 us div and 500 ns div After changing the time base wait some seconds until the trace has settled Observe the Input A trace and check to see if it is set to the same position after changing the time base The allowed difference is 0 04 division 1 pixel Observe the Input B trace for the same conditions Pe
84. FLUKE 123 Industrial ScopeMeter Service Manual 4822 872 05375 August 1997 Rev 3 01 00 1997 Fluke Corporation All rights reserved Printed in the Netherlands All product names are trademarks of their respective companies SERVICE CENTERS To locate an authorized service center visit us on the World Wide Web http www fluke com or call Fluke using any of the phone numbers listed below 1 888 993 5853 in U S A and Canada 3 1 402 678 200 in Europe 1 425 356 5500 from other countries Table of Contents Chapter Title Page 1 Safety Instructions cinc ii 1 1 1 T Introduction NO 1 3 1 2 Safety Precautioris iue mee rre her eee a re Dritte oar cole 1 3 1 3 Caution and Warning Statements eese 1 3 ES A eeniteee iet ie 1 3 1 5 Impaired Safety iere rete eripe edes 1 4 1 6 General Safety Information esse eee eee eee 1 4 2 Characteristics iii tdi 2 1 2 ntroductiOD ea t tret e e ot ee tr etatis 2 3 2 2 Dual Input Oscilloscope eese ener 2 3 2 2 Mertical Dt eer d e tin e bte en eter eade n 2 3 2 2 2 Horizontal a 2 4 A A EE 2 4 2 2 4 Advanced Scope Functions sse 2 5 2 3 Dual Input Meter AS 2 5 2 3 1 Input A and Input B sess 2 5 2 92 IDDUE A inito reete e Peer E PE ND ede teen eie duae 2 8 2 3 3 Advanced Meter Functions sess 2 8 2 4 Miscellaneous rete bee et eie tpe et ee em eh e hi ees 2 9 2 5 Environmental nde eei tas 2 1
85. Gain Calibration Points Slow Cal step 5500A Setting Test Tool Input Signal 1 kHz MODE Requirements wavegen 1 kHz square trise lt 2 us WAVE square flatness after rising edge lt 0 5 after 4 us HF Gain AB CL 0609 For firmware V01 00 HF Gain AB CL 0610 HF Gain A CL 0611 HF Gain B CL 0631 HF Gain A CL 0612 HF Gain B CL 0632 HF Gain A CL 0613 HF Gain B CL 0633 HF Gain A CL 0614 HF Gain B CL 0634 HF Gain A CL 0615 HF Gain B CL 0635 For firmware gt V01 00 HF Gain A CL 0612 HF Gain B CL 0632 HF Gain A CL 0615 HF Gain B CL 0635 After starting the first step in this table cell these steps are done automatically 5 6 2 Delta T Gain Trigger Delay Time amp Pulse Adjust Input A Note For firmware version V01 00 the Pulse adjust Input A calibration is a separate step described in Section 5 6 3 Proceed as follows to do the calibrations 1 Press to select calibration step Delta T CL 0700 IDLE 2 Connect the test tool to the 5500A as shown in Figure 5 4 FLUKE 5500A CALIBRATOR ST8004 CGM Figure 5 4 5500A Scope Output to Input A 3 Set the 5500A to source a 1V 1 MHz fast rising rise time lt 1 ns square wave SCOPE output MODE edge 123 Service Manual Set the 5500A to operate OPR Press E to start the calibration The Delta T gain Trigger Delay CL0720 and Pulse Adjust Input A CL0640 will be calibrated For firmware V01 00
86. H RC12H RC12H RC12H RC12H RC12H RC12G RC12H RC12H RC12H RC12H RC12G RC12H RC12H RC12H RC12H RC12H RC12H RC12H RC12H RC12H RC12H RC12G RC12H RC12G RC12H RC12H RC12H RC12H RC12H 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 215K 147K 909K 215K 100K 100K 681K 681K 178K 100K 287E 287E 100E 51K1 100K 348E 10E 10E 10E 10E 10E 3K16 10K 10K 10K 21K5 10K 21K5 10K 100K 31K6 34K8 681K 5322 117 12488 5322 117 12489 5322 117 12491 5322 117 12457 5322 117 12485 5322 117 12485 5322 117 12458 5322 117 12458 5322 117 12459 5322 117 12485 5322 117 12461 5322 117 12461 4822 117 11373 5322 117 12462 5322 117 12485 5322 117 12456 5322 117 12464 5322 117 12464 5322 117 12464 5322 117 12464 5322 117 12464 5322 117 12465 4822 117 10833 4822 117 10833 4822 117 10833 5322 117 12492 4822 117 10833 5322 117 12492 4822 117 10833 4822 117 10837 5322 117 12466 5322 117 12467 5322 117 12458 Ordering Code List of Replaceable Parts 8 5 Main PCA Parts Remarks Reference Description Designator R322 R323 R324 R326 R327 R331 R333 R337 R339 R342 R352 R353 R354 R356 R369 R371 R375 R376 R377 R378 R381 R385 R390 R391 R392 R393 R394 R395 R396 R398 R403 R404 R405 RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESIS
87. IL28800E Class 3 3 7 8 2 amp 4 5 6 2 2 Structural parts meet 48 hours 5 salt solution test Electromagnetic Compatibility EMC Emission EN 50081 1 1992 EN55022 and EN60555 2 Immunity EN 50082 2 1992 IEC1000 4 2 3 4 5 see also Section 2 8 Tables 2 1 to 2 3 Enclosure Protection IP51 ref IEC529 2 10 Characteristics 2 2 6 Service and Maintenance 2 6 Service and Maintenance Calibration Interval 1 Year 2 7 Safety Designed for measurements on 600 Vrms Category III Installations Pollution Degree 2 er ANSI ISA S82 01 1994 EN61010 1 1993 IEC1010 1 CAN CSA C22 2 No 1010 1 92 including approval UL3111 1 including approval eee 63 Max Input Voltage Input A and B Direct on input or with leads 600 Vrms For derating see Figure 2 1 With Banana to BNC Adapter BB120 300V rms For derating see Figure 2 1 Max Floating Voltage from any terminal to ground 600 Vrms up to 400Hz MAX INPUT VOLTAGE Vrms 1000 500 ke et WITH BB120 200 100 50 20 10 5 2 1 0 01 0 02 0 05 01 02 05 1 2 5 10 20 50 100 FREQUENCY MHz ST8112 CGM Figure 2 1 Maximum Input Voltage vs Frequency 123 Service Manual 2 8 EMC Immunity The Fluke 123 including standard accessories conforms with the EEC directive 89 336 for EMC immunity as defined by IEC1000 4 3 with the addition of tables 2 1 to 2 3 Trace D
88. IPCAP X7B 0805 10 22NF CER CHIP CAP 63V 10 4 7NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIP CAP 63V 5 150PF CER CAP X5R 1206 10 1UF ELCAP 10V ALCAP SANYO ALCAP SANYO ALCAP SANYO ALCAP SANYO ALCAP SANYO ALCAP SANYO ALCAP SANYO ALCAP SANYO ALCAP SANYO ALCAP SANYO ALCAP SANYO 20 390UF 6 3V 20 6 3V 20 6 3V 20 35V 20 6 3V 20 6 3V 20 6 3V 20 6 3V 20 6 3V 20 6 3V 20 6 3V 20 150UF 150UF 150UF 47UF 150UF 150UF 150UF 150UF 150UF 150UF 150UF ALCAP NICHICON 16V 10UF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIPCAP 25V 20 100NF CER CHIP CAP 25V 20 47NF CER CHIPCAP 25V 20 100NF CER CAP X5R 1206 10 1UF CHIPCAP NPO 0805 5 1NF CER CHIPCAP 25V 20 100NF CHIPCAP X7R 0805 10 10NF MKT FILM CAP 63V 10 100NF 5322 122 32654 5322 122 32654 5322 122 32654 5322 126 10223 5322 126 13638 5322 126 13638 5322 122 33538 5322 126 14089 5322 124 11844 5322 124 11841 5322 124 11841 5322 124 11841 5322 124 11842 5322 124 11841 5322 124 11841 5322 124 11841 5322 124 11841 5322 124 11841 5322 124 11841 5322 124 11841 5322 124 41979 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 13638 5322 126 14045 5322 126 13638 5322 126 14089 5322 126 10511 5322 126 13638 5322 122 34098 5322 121 42386 8 123 Service Manual Ordering Code Remarks Reference Description
89. Jump After changing time base or sensitivity Normal amp Single mode 0 04 divisions 1 pixel 2 2 2 Horizontal Scope Modes Normal Single Roll Ranges Normal equivalent sampling 20 ns to 500 ns div real time sampling 1 us to 5 s div Single real time 1 us to 5 s div Roll real time 1s to 60 s div Sampling Rate for both channels simultaneously Equivalent sampling repetitive signals up to 1 25 GS s Real time sampling 1 us to 5 ms div 25 MS s 10 ms to 5 s div 5 MS s Time Base Accuracy Equivalent sampling 0 4 0 04 time div Real time sampling 0 1 0 04 time div Glitch Detection 240 ns 20 ns to 5 ms div 2200 ns 10 ms to 60 s div Glitch detection is always active Horizontal Move 10 divisions Trigger point can be positioned anywhere across the screen 2 2 3 Trigger Screen Update Free Run On Trigger Source A B EXT EXTernal via optically isolated trigger probe ITP120 optional accessory Sensitivity A and B DC to 5 MHz 25 MHz 40 MHz Voltage level error Slope Video on A Modes Standards Polarity Sensitivity 2 2 4 Advanced Scope Functions Characteristics 2 2 3 Dual Input Meter 0 5 divisions or 5 mV 1 5 divisions 4 divisions 0 5 div max Positive Negative Interlaced video signals only Lines Line Select PAL NTSC PAL SECAM Positive Negative 0 6 divisions sync Display Modes Normal Captures up to 40 ns glitches and displays analog like persistence waveform
90. LOW ADC various analog signals can be measured by the D ASIC Involved signals are battery voltage BATVOLT battery type IDENT battery temperature TEMP battery current BATCUR LCD temperature LCDTEMP from LCD unit and 3 test output pins of the C ASIC s and the T ASIC DACTEST The signals are used for control and test purposes The BACK LIGHT CONVERTER generates the 400V supply voltage for the LCD fluorescent back light lamp If the lamp is defective a 1 5 kV voltage can be present for 0 2 second maximum The brightness is controlled by the BACKBRIG signal supplied by the D ASIC Serial communication with a PC or printer is possible via the RS232 optically isolated interface This interface is also used for external trigger input using the Isolated Trigger Probe The P ASIC buffers the received data line RXDA and supplies the buffered data RXD to the D ASIC The transmit data line TXD is directly connected to the D ASIC Circuit Descriptions 3 2 Block Diagram A linear regulator in the P ASIC derives a 12V voltage from the power adapter voltage The 12V is used as programming voltage for the Flash EPROM on the Digital part 3 2 5 Start up Sequence Operating Modes The test tool sequences through the following steps when power is applied see also Figure 3 2 1 The P ASIC is directly powered by the battery or power adapter voltage VBAT Initially the Fly Back Converter is off and the D ASIC is powered by VBAT
91. R203 R204 R205 R206 R208 R306 R312 R321 R322 R323 R324 R327 R333 R339 R378 R381 R391 R392 R486 R487 T552 T600 V302 V401 V402 V603 X452 X453 X501 X503 X601 Z501 C2 C2 C2 D2 D1 D2 B3 C3 C3 C3 B3 B3 C3 B3 B3 C3 C3 C3 C3 C4 C4 CB AS A4 A4 A4 B4 A4 A3 D4 AS A4 D3 2 E2 2 E4 2 E4 2 A2 2 E2 py UJ TU 598239 00 oo OW WW WWW Ww ma m ade 099 e gt a Table 9 2 Parts Location Main PCA Side 2 Circuit Diagrams 9 2 Schematic Diagrams B401 C107 C131 C132 C133 C134 C136 C142 C145 C148 C152 C153 C156 C158 C159 C161 C162 C182 C184 C186 C188 C189 C190 C191 C199 C207 C231 C232 C233 C234 C236 C242 C245 C248 C252 C253 C256 C258 C259 C261 C262 C282 C284 C286 C288 C289 C290 C291 C301 C306 C311 C312 B4 D2 D2 D2 D2 D2 D2 C2 D2 C1 D2 D2 C3 C2 C2 D2 D3 C2 C2 D2 C2 D2 C2 C2 D3 B2 B2 B2 B2 B2 B2 A2 B2 B1 B2 B2 A3 B2 B2 B2 B3 A2 A2 B2 A2 B2 B2 A2 C3 D3 C3 C3 NNN oou oo o sk mog an T RA qgogomuumsnmuumoccgomn o o 00 A Y oo O Y Y co A 00 o Y Q G G M M M MM M MMM MMM MM MM M M M M Q Oo co N C331 C332 C342 C344 C356 C357 C376 C377 C378 C379 C381 C382 C391 C393 C394 C396 C397 C398 C401 C402 C403 C404 C407 C408 C409 C416 C431 C432 C433 C434
92. RC 02H 1 511E 2K15 2K15 10M 10M 10M 10M 215E 215E 68E1 464E 10M 68E1 68E1 1M 100K 10K 1K 100E 56K2 56K2 56K2 56K2 5322 117 12464 5322 117 12464 5322 117 12464 5322 117 12464 4822 050 24874 4822 050 24874 4822 117 11948 5322 117 12448 5322 117 12451 5322 116 40274 5322 117 12451 5322 117 12452 5322 117 12452 4822 051 20106 4822 051 20106 4822 051 20106 4822 051 20106 5322 117 12453 5322 117 12453 5322 117 12454 5322 117 12455 4822 051 20106 5322 117 12454 5322 117 12454 5322 117 12484 5322 117 12485 5322 117 12486 5322 117 12487 4822 051 51001 5322 117 10574 5322 117 10574 5322 117 10574 5322 117 10574 8 123 Service Manual Ordering Code Remarks Reference Description Designator R241 R242 R243 R246 R251 R252 R253 R254 R255 R256 R257 R258 R259 R260 R261 R271 R282 R284 R286 R288 R289 R301 R302 R303 R305 R306 R307 R308 R309 R310 R311 R312 R321 RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RC12G RC12G RC12G RC12
93. RESISTOR CHIP RC12H 1 RESISTOR CHIP LRCO1 5 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 RESISTOR CHIP RC12H 1 1K47 51K1 348E 0E1 10K 4K22 26K1 10K 4022 301 22071 4022 301 22071 5322 117 12462 5322 117 12465 5322 117 12465 5322 117 12471 4022 301 22251 5322 117 11759 5322 117 12464 5322 117 12464 4822 117 11151 4822 117 11151 4822 117 11151 4822 117 10833 5322 117 12463 5322 117 12608 5322 117 12448 5322 117 12465 5322 117 12481 4822 117 11373 5322 117 12482 5322 117 12467 5322 117 12617 5322 117 12477 4022 301 21591 5322 117 12479 5322 117 12462 5322 117 12456 5322 117 11759 4822 117 10833 5322 117 12476 5322 117 12448 4822 117 10833 8 8 21 123 Service Manual 8 22 Ordering Code Remarks Reference Description Designator R558 R559 R561 R562 R563 R564 R565 R570 R580 R591 R600 R602 R603 R604 R605 R606 T552 T600 V171 V172 V174 V301 V302 V353 V354 V356 V358 V359 V395 RESISTOR CHIP RC12H 1 31K6 RESISTOR CHIP RC12H 1 5K11 RESISTOR CHIP RC12H 1 100E RESISTOR CHIP RC12H 1 100E RESISTOR CHIP RC12H 1 100K RESISTOR CHIP RC12H 1 100K RESISTOR CHIP RC12H 1 100K RESISTOR CHIP RC12H 1 100K RESISTOR CHIP LRCO1 5 0E33 RESISTOR CHIP RC12H 1 2K15 RESISTOR CHIP RC12H 1 5K11 RESISTOR CHIP RC12H 1 10K RESISTOR CHIP RC12H 1 100K RESISTOR CHIP RC12H 1 1K SMD RES 10K 1 TC50 0805 SMD RES 6K19 1 TC50 0805
94. TOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC 02H 1 RC 02H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 681K 34K8 215K 562K 562K 10K 10K 10K 10K 10K 5K11 1K 261E 261E 26K1 0E 0E 10E 1E 10E 10E 0E 464K 1K 4K22 10E 1E 0E 10E 1E 21K5 1E 1K 5322 117 12458 5322 117 12467 5322 117 12457 5322 117 12468 5322 117 12468 4822 117 10833 4822 117 10833 4822 117 10833 4822 117 10833 4822 117 10833 5322 117 12469 4822 117 11154 4822 051 52611 4822 051 52611 5322 117 12448 5322 117 12471 5322 117 12471 5322 117 12464 5322 117 12472 5322 117 12464 5322 117 12464 5322 117 12471 5322 117 12474 4822 117 11154 5322 117 12476 5322 117 12464 5322 117 12472 5322 117 12471 5322 117 12464 5322 117 12472 5322 117 12477 5322 117 12472 4822 117 11154 8 123 Service Manual 8 20 Ordering Code Remarks Ref
95. TVOUT TVSYNC lines Two adjustable trigger levels are supplied by the D ASIC via the PWM FILTERS TRIGLEV 1 and TRIGLEV2 line Depending on the selected trigger conditions source level edge mode the T ASIC generates the final trigger signal TRIGDT which is supplied to the D ASIC Circuit Descriptions 3 2 Block Diagram Note External triggers supplied via the optical interface RXDA line are buffered by the P ASIC and then supplied to the D ASIC RXD signal The TRIG A input is also used for capacitance measurements as described in Section 3 2 1 The T ASIC includes a constant current source for resistance and capacitance measurements The current is supplied via the GENOUT output and the Q F relays to the unknown resistance Rx or capacitance Cx connected to Input A The SENSE signal senses the voltage across Cx and controls a CLAMP circuit in the T ASIC This circuit limits the voltage on Input A at capacitance measurements The protection circuit prevents the T ASIC from being damaged by voltages supplied to the input during resistance or capacitance measurements For probe adjustment a voltage generator circuit in the T ASIC can provide a square wave voltage via the GENOUT output to the Input A connector The T ASIC contains opamps to derive reference voltages from a 1 23V reference source The gain factors for these opamps are determined by resistors in the REF GAIN circuit The reference voltages are supplied to va
96. ack Converter d MS404 REFPWM1 for 3 3V 3 Bad contrast a Check MS403 CONTRAST see Figure below 0 8V 50 mV 15ms If not correct check FRAME signal on V401 for 0 3V 250 ns pulses 66Hz check PWM circuit Section 7 5 14 check V401 V403 b Check MS408 LCDTEMP1 for 1 6V at room temperature to SLOW ADC If not correct check R591 in SLOW ADC part 4 Defective backlight a Turn the test tool on and monitor the voltage on T600 pin 3 or pin 5 fora 8 Vpp 66 kHz half rectified sine wave If a half rectified sine wave with an increasing amplitude is only seen for about 0 2 second directly after power on then the secondary circuit is defective Install a new LCD unit If this does not cure the problem check the resistance between T600 pin 10 and 11 for 300Q replace V603 V605 Check C606 b Check T600 pin 3 and pin 5 for a 8 Vpp 66 kHz half rectified sine wave If it is present on only pin 3 or pin 5 then replace V601 7 8 Corrective Maintenance T 7 5 Miscellaneous Functions c Check TP601 and TP602 for a 7Vpp 66 kHz square wave If not correct then check TP604 TLON for 3V3 If TLON is correct then replace N600 d Check replace V600 V602 Backlight brightness control not correct Check the TP605 BACKBRIG supplied by D ASIC D471 for a 25 kHz 3 3 V pulse signal The duty cycle of the pulses controls the back light brightness The backl
97. alibration using known reference sources It measures the reference signals calculates the correction factors and stores the correction factors in RAM After completing the calibration the correction factors can be stored in FlashROM The test tool should be calibrated after repair or if it fails the performance test The test tool has a normal calibration cycle of one year 5 1 2 Calibration number and date When storing valid calibration data in FlashROM after performing the calibration adjustment procedure the calibration date is set to the actual test tool date and calibration number is raised by one To display the calibration date and number 1 Press 4 to open the USER OPTIONS menu 2 Press to show the VERSION amp CALIBRATION screen see Figure 5 1 3 Press to return to normal mode 50 00 1 ms myz PPPE FENNE ENEE GPs FETTE FEFEFE TTT TTT ips ears VERSION amp CALIBRATION MODEL NUMBER 123 SOFTWARE VERSION U01 00 CALIBRATION HUMBER 3 CALIBRATION DATE 1271071996 BATTERY REFRESH DATE 1271071996 BATTERY BATTERY Lancunce Back EXIT Figure 5 1 Version amp Calibration Screen VERSION BMP 5 1 3 General Instructions Follow these general instructions for all calibration steps Allow the 5500A to satisfy its specified warm up period For each calibration point wait for the 5500A to settle The required warm up period for the test tool is included in the WarmingUp amp PreCal
98. ance frequency After half a cycle a zero voltage is detected on pin 9 ZD of N600 V601a will be turned off and V601b is turned on This process goes on each time a zero is detected The secondary current is sensed by R600 R604 and fed back to N600 pin 7 and pin 4 for regulation of the PWM buck regulator output voltage The BACKBRIG signal supplied by the D ASIC provides a pulse width modulated variable duty cycle square wave By changing the duty cycle of this signal the average on resistance of V604 can be changed This will change the secondary current and thus the back light intensity The voltage on the cold side of the lamp is limited by V605 and V603 This limits the emission of electrical interference Circuit Descriptions 3 3 3 Detailed Circuit Descriptions In PCB versions 8 and newer R605 and R606 provide a more reliable startup of the backlight converter CS a N SES Voltage at T600 pin 4 Voltage AOUT Voltage BOUT Voltage COUT t T f Zero Zero detect detect Figure 3 7 Back Light Converter Voltages 3 3 2 Channel A Channel B Measurement Circuits The description below refers to circuit diagrams Figure 9 1 and Figure 9 2 The Channel A and Channel B circuits are almost identical Both channels can measure voltage and do time related measurements frequency pulse width etc Channel A also provides resistance continuity diode and capacitance measurements The Channel A B circuitry is built up around a
99. and Input B Check a TP156 TP256 for a 600 mV 6 div x 100 mV div 1 kHz sine wave the DC level depends on the trace position If not correct C ASIC N101 N102 is probably defective b TP321 TP322 for 1 1 1 9V DC move the trigger level from top to bottom If not correct check the PWM circuit see Section 7 5 8 c TP311fora0 3 3V 1 kHz square wave when the trigger level is at the middle of the trace Change the trigger level and verify that the duty cycle of the square wave changes If not correct T ASIC N301 may be defective d TP433 for 0 3 3V pulses Pulse width 4 10 us for time base 2 us div and faster 740 us for time base 5 us div and slower pulse width increases with time base e TP336 for 0 6 0V pulses TP436 for 3 3 0V pulses the pulse width is about 40 us 10 ms If not correct check the RANDOMIZE circuit see Section 7 5 15 f TP437 SMPCLK for a 5 MHz time base 2 10 ms div or 25 MHz time base lt 10 ms div clock signal 3 3V Check SMPCLK on both sides of R339 To test video trigger press to select the SCOPE INPUTS menu Press to select the TRIGGER menu and select INPUT M VIDEO on A From the VIDEO TRIGGER submenu select SYSTEM M PAL LINE M RANDOM POLARITY M POSITIVE Press to open the SCOPE INPUTS menu Press to open the SCOPE OPTIONS menu and select SCOPE MODE M NORMAL WAVEFORM MODE M NORMAL Corrective Maintenance T 7 5 Miscellaneous Functions
100. ange 0 5 mA 21 ms gt 2 8V lt 4V 2 5 counts 0 5 mA on input A on COM 50 nF 500 nF 5 uF 50 uF 500 uF 2 10 counts 5000 counts 5 uA to 0 5 mA increases with increasing ranges Dual slope integrating measurement with parasitic serial and parallel resistance cancellation Set actual value to reference Is lus to 10 ms div 2s lus to 10 ms div 10s lus to 10 ms div Touch Hold on A TrendPlot Fixed Decimal Point 2 4 Miscellaneous Display Size Resolution Waveform display Vertical Horizontal Backlight Power External Input Voltage Power Input Connector Internal Battery Power Operating Time Charging Time Allowable ambient temperature during charging Memory Number of Screens Number of User Setups Mechanical Size Weight Characteristics 2 2 4 Miscellaneous Captures and freezes a stable measurement result Beeps when stable Touch Hold works on the main meter reading with threshholds of 1 Vpp for AC signals and 100mV for DC signals Graphs meter readings of the Min and Max values from 15 s div 120 seconds to 2 days div 16 days with time and date stamp Automatic vertical scaling and time compression Displays the actual and Minimum Maximum or average AVG reading Possible by using attenuation keys 72 x 72 mm 2 83 x 2 83 in 240 x 240 pixels 8 divisions of 20 pixels 9 6 divisions of 25 pixels Cold Cathode Fluorescent CCFL
101. apter 5 and or repair see Chapter 7 is necessary The Performance Verification Procedure is based on the specifications listed in Chapter 2 of this Service Manual The values given here are valid for ambient temperatures between 18 C and 28 C The Performance Verification Procedure is a quick way to check most of the test tool s specifications Because of the highly integrated design of the test tool it is not always necessary to check all features separately For example the duty cycle pulse width and frequency measurement are based on the same measurement principles so only one of these functions needs to be verified 4 2 Equipment Required For Verification The primary source instrument used in the verification procedures is the Fluke 5500A If a 5500A is not available you can substitute another calibrator as long as it meets the minimum test requirements e Fluke 5500A Multi Product Calibrator including 5500A SC Oscilloscope Calibration Option e Stackable Test Leads 4x supplied with the 5500A e 500 Coax Cables 2x Fluke PM9091 1 5m or PM9092 0 5m e 50Q feed through terminations 2x Fluke PM9585 e Fluke BB120 Shielded Banana to Female BNC adapters 2x supplied with the Fluke 123 e Dual Banana Plug to Female BNC Adapter 1x Fluke PM9081 001 e Dual Banana Jack to Male BNC Adapter 1x Fluke PM9082 001 e TV Signal Generator Philips PM5418 e 750 Coax cable 1x Fluke PM9075 e 750 Feed through
102. are shown 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Performance Verification 4 4 5 Input A and Input B Tests Verify that the 5500A voltage is between 1 5V and 2 5V when the test tool is triggered To repeat the test start at step 12 Set the 5500A to Standby Press to clear the display Select the following test tool setup e Press to open the SCOPE INPUTS menu e Press to open the TRIGGER menu and choose INPUT B B SCREEN UPDATE M FREE RUN AUTO RANGE B gt 15HZ e Press E to enable the arrow keys for Trigger Level and Slope adjustment e Using 06 select positive slope triggering trigger icon J e Using DO set the trigger level to 2 divisions from the screen center For positive slope triggering the trigger level is the top of the trigger icon T Set the 5500A to source 0 4V DC Verify that no trace is shown on the test tool display and that the status line at the display bottom shows Wait B T If the display shows the traces and status Hold B J then press to re arm the test tool for a trigger Increase the 5500A voltage slowly in 0 1V steps using the 5500A EDIT FIELD function until the test tool is triggered and the traces are shown Verify that the 5500A voltage is between 1 5V and 2 5V when the test tool is triggered To repeat the test start at step 19 Set the 5500A to Standby Press to clear the display Press t
103. asing current flows in the primary transformer winding to ground via sense resistor R551 If the voltage FLYSENSP across this resistor exceeds a certain value the P ASIC turns FET V554 off Then a decreasing current flows in the secondary windings to ground If the windings are empty all energy transferred the voltage VCOIL sensed by the P ASIC pin 52 is zero and the FLYGATE signal will turn FET V554 on again Primary current V554 ON FLYGATE SIGNAL V554 OFF Figure 3 5 Fly Back Converter Current and Control Voltage The output voltage is regulated by feeding back a part of the 3 V3A output voltage via R552 R553 R554 to pin 54 VSENS This voltage is referred to a 1 23V reference voltage Any deviation of the 3V3A voltage from the required 3 3V changes the current level at which current FET V554 will be switched off If the output voltage increases the current level at which V554 is switched off will become lower and less energy is transferred to the secondary winding As a result the output voltage will become lower An internal current source supplies a current to R559 The resulting voltage is a reference for the maximum allowable primary current IMAXFLY The voltage across Circuit Descriptions 3 3 3 Detailed Circuit Descriptions the sense resistor FLYSENSP is compared to the IMAXFLY voltage If the current exceeds the set limit FET V554 will be turned off Another internal current source supplies a
104. at N501 pin 43 for a triangle waveform 80 100 kHz 1 6V to T3 2V 5 If 1 to 4 correct then replace N501 7 4 Starting with a Dead Test Tool If the test tool cannot be turned on when powered by a charged battery pack or by the power adapter follow the steps below to locate the fault 1 Connect a power adapter and a charged battery pack 2 Turn the test tool on and listen if you hear a beep If you hear no beep continue at 7 4 1 Test Tool Completely Dead b If you hear a weak beep continue at 7 4 2 Test Tool Software Does not Run c Ifyou hear a normal beep the software runs but obviously the test tool is not operative Continue at 7 4 3 Software Runs Test Tool not Operative 7 4 1 Test Tool Completely Dead 1 Turn the test tool off Keep the keys ep pressed and turn the test tool on again This will start up the mask software If you still hear no beep continue at step 2 If you hear a weak beep now continue at Section 7 4 2 Check the Keyboard ROW1 line MS433 next to X452 for a 100 kHz square wave If not correct continue at step 3 If correct the mask software runs but the buzzer circuit does not function Check the buzzer function Section 7 5 10 and then continue at Section 7 4 2 Check N501 pin 60 VBATSUP for gt 4 8V If not correct check R503 and connections to battery pack Check TP571 3V3GAR for 3V3V If not correct this is possibly caused by V569 R580 TP571 short to g
105. ation Points sess 4 17 4 5 Volts Peak Measurement Verification Ponts eee eee ee 4 18 4 6 Phase Measurement Verification Points sese eene 4 18 4 7 V DC and V AC High Voltage Verification Tests 4 20 4 8 Resistance Measurement Verification Points 4 21 4 9 Capacitance Measurement Verification Ponts sese eee eee eee 4 23 5 1 HF Gain Calibration Points Fast TTT 5 8 5 2 HF Gain Calibration Points Slow eese ener 5 9 5 3 Volt Gain Calibration Points 300 5 12 5 4 Ohm Gain Calibration Pommes aah Ehana Trae TOE Ai E Rei 5 14 Fel Starting Fault Finding ein e erret Pear Eee dene 7 4 851 Final Assembly Parts ien E Here ree E P RE n 8 4 82 Main PCA Unitat eee ere oed db e AE ead 8 6 8 3 Main PEAD LT ia E ATE EU AU e ee dt eli a bo 8 7 9 Parts Location Main PCA Side 1 eese ene 9 4 9 2 Parts Location Main PCA Side 2 sese eren nennen ennt 9 5 List of Figures Figure Title Page 3 1 Fluke 123 Block Diagram ccccessssscscsecscsecsestecssestesesceneceasessseseaceesseenasens 3 2 3 2 Fluke 123 Start up Sequence Operating Modes eee 3 8 3 3 Power Supply Block Diagram sss sees 3 9 3 4 CHAGATE Control Voltage sss sees ee eee 3 12 3 5 Fly Back Converter Current and Control Voltage sese eee eee 3 12 3 6 Fly Back Converter Block Diagram sees eee 3 13 3 7 Back Light Converter Voltages sese 3 15 3 8 C ASIC Block
106. ave to 0 5 division on the display 5 Verify that the signal is well triggered If it is not press to enable the up down arrow keys for Trigger Level adjustment adjust the trigger level using DD and verify that the signal will be triggered now The trigger level is indicated by the trigger icon J Set the 5500A to source a 25 MHz leveled sine wave of 400 mV peak to peak 7 Adjust the amplitude of the sine wave to 1 5 divisions on the test tool display 4 7 123 Service Manual 4 8 10 11 12 Verify that the signal is well triggered If it is not press to enable the up down arrow keys for Trigger Level adjustment adjust the trigger level and verify that the signal will be triggered now Set the 5500A to source a 40 MHz leveled sine wave of 1 8V peak to peak Adjust the amplitude of the sine wave to 4 divisions on the test tool display Verify that the signal is well triggered If it is not press to enable the up down arrow keys for Trigger Level adjustment adjust the trigger level and verify that the signal will be triggered now When you are finished set the 5500A to Standby 4 5 3 Input A Frequency Response Upper Transition Point Test Proceed as follows to test the Input A frequency response upper transition point 1 2 alr OYA cem Connect the test tool to the 5500A as for the previous test see Figure 4 3 Select the following test tool setup e Press to select auto ranging AUTO in top of
107. ay shows the calibration step in progress and its status The first step is WarmingUp CL0200 BUSY 00 29 59 The warming up period is counted down from 00 29 59 to 00 00 00 Then the other pre calibration steps are performed automatically The procedure takes about 60 minutes 3 Wait until the display shows End Precal READY 4 Continue at Section 5 6 5 6 Final Calibration You must always start the Final Calibration at the first step of Section 5 6 1 Starting at another step will make the calibration invalid If you proceeded to step N for example step CL 0615 then return to a previous step for example step CL 0613 and then calibrate this step the complete final calibration becomes invalid You must do the final calibration from the beginning step CL 0600 again You can repeat a step that shows the status READY by pressing again 5 6 1 HF Gain Input A amp B Proceed as follows to do the HF Gain Input A amp B calibration 1 Press to select the first calibration step in Table 5 1 HFG 8 FI AB CL 0600 2 Connect the test tool to the 5500A as shown in Figure 5 3 Do NOT use 500 terminations FLUKE 5500A CALIBRATOR NOS YY BB120 i y PM9093 PM9091 001 1 5m PM9092 001 0 5m ST8097 ST8097 CGM Figure 5 3 HF Gain Calibration Input Connections 5 7 123 Service Manual 3 Set the 5500A to source a 1 kHz fast rising edge square wave Output SCOPE MODE edge to the first cal
108. bling the Test Tool Clean the display glass with a moist soft cloth if necessary Install the display assembly Ensure that the display is secured correctly by the four alignment tabs in the top case It is secured correctly when it cannot be moved horizontally Install the keypad pressure plate Press the plate firmly and slide it under the four plastic keeper tabs in the top case Install the main PCA unit and re attach the cables Secure the flat cables in the connectors with the connector latches Keep the backlight wires twisted to minimize interference voltages Insert the shielding flap below the main PCA shielding plate Put the bottom case and the top case together at the flat cable side and hinge the cases to each other This ensures the keypad foil flat cable is folded correctly Install the battery pack and the battery door see figure 6 5 DUST SEAL SHIELDING FOIL TOPCASE INTERCONNECTOR PART SHIELDING BRACKET INTERCONNECTOR PART DISPLAY ASSEMBLY SHIELDING BRACKET ST8185 ST8185 EPS Figure 6 4 Mounting the display shielding bracket ST8197 EPS Figure 6 5 Battery pack installation 6 9 Chapter 7 Corrective Maintenance Title Page PA Introductio im A A ai 7 3 7 2 Starting TILT T 7 4 7 3 Charger MIU 7 4 7 4 Starting with a Dead Test Tool 7 6 7 4 1 Test Tool Completely Dead sees 7 6 7 4 2 Test Tool Software Does n
109. bration Points Cal Step Input Value Gain Ohm CL 0860 Cap Pos CL 0920 Cap Neg CL 0921 1000 Gain Ohm CL 0861 Cap Pos CL 0922 Cap Neg CL 0923 Gain Ohm CL 0862 Cap Pos CL 0924 Cap Neg CL 0925 Gain Ohm CL 0863 Cap Pos CL 0926 Cap Neg CL 0927 Gain Ohm CL 0865 Gain Ohm CL 0866 D The capacitance measurement current calibrations Cap Pos and Cap Neg are done automatically after the Gain Ohm calibration The Gain Ohm CL0866 calibration step is done automatically after the Gain Ohm CL0865 calibration Calibration Adjustment 5 6 Final Calibration 5 6 9 Capacitance Gain Low and High Proceed as follows to do the Capacitance Gain calibration 1 Press to select calibration adjustment step Cap Low CL 0900 IDLE 2 Connect the test tool to the 5500A as shown in Figure 5 9 3 4 5 6 7 8 9 FLUKE 5500A CALIBRATOR ST8002 CGM Figure 5 9 Capacitance Gain Calibration Input Connections Set the 5500A to supply 250 mV DC Set the 5500A to operate OPR Press E to start the calibration Wait until the display shows Cap Low CL 0900 READY Press 23 to select calibration adjustment step Cap High CL 0910 IDLE Set the 5500A to supply 50 mV DC Press to start the calibration 10 Wait until the display shows Cap High CL 910 READY 11 Set the 5500A to Standby 12 Continue at Section 5 6 10 5 6 10 Capacitance Clamp amp Zero Pr
110. by the D ASIC via the SDA data line The SCL line provides the synchronization clock signal Voltage Measurements Channel A amp Channel B The following description applies to both Channel A and Channel B The input voltage is applied to the HF attenuator inputs of the C ASIC via C104 and to the LF input of the C ASIC via R101 R102 AC DC input coupling relay K171 and R104 The C ASIC conditions the input voltage to an output voltage of 50 mV div This voltage is supplied to the ADC on the Digital part The ADC output data is read and processed by the D ASIC and represented as a numerical reading and as a graphical trace Table 3 3 shows the relation between the reading range V and the trace sensitivity V div The selected trace sensitivity determines the C ASIC attenuation gain factor The reading range is only a readout function it does not change the hardware range or the wave form display 123 Service Manual Table 3 3 Voltage Ranges And Trace Sensitivity range 50V 50V 50V 500V 500V 500V 1250V trace div 20V 50V 100V 200V 500V During measuring input voltage measurements gain measurements and zero measurements are done As a result the voltage supplied to the ADC is a multiplexed zero reference reference input voltage signal In ROLL mode however no gain and zero measurements are done Now the ADC input voltage includes only the conditioned input voltage The input voltage is connected to Input A The s
111. calibration step Ensure that the test tool battery is charged sufficiently 5 3 123 Service Manual 5 2 Equipment Required For Calibration The primary source instrument used in the calibration procedures is the Fluke 5500A If a 5500A is not available you can substitute another calibrator as long as it meets the minimum test requirements e Fluke 5500A Multi Product Calibrator including 5500A SC Oscilloscope Calibration Option e Stackable Test Leads 4x supplied with the 5500A e 500 Coax Cables 2x Fluke PM9091 or PM9092 e 50Q feed through terminations 2x Fluke PM9585 e Fluke BB120 Shielded Banana to Female BNC adapters 2x supplied with the Fluke 123 e Dual Banana Plug to Female BNC Adapter 1x Fluke PM9081 001 e Male BNC to Dual Female BNC Adapter 1x Fluke PM9093 001 e 20V 1V 0 5A DC power supply not for serial numbers gt DM7000000 e Power adapter input supply cable not for serial numbers gt DM7000000 refer to Section 8 8 for the ordering number 5 3 Starting Calibration Adjustment Follow the steps below to start calibration adjustments 1 Power the test tool via the power adapter input using the PM8907 power adapter 2 Check the actual test tool date and adjust the date if necessary e press ES to open the USER OPTIONS menu e using G select DATE ADJUST e press E to open the DATE ADJUST menu e adjust the date if necessary 3 Select the Maintenance mode The Calibration A
112. ccuracy Test 5500A output 600 mVpp Input A B Reading 0 993 to 1 007 MHz 10 MHz 09 88 to 10 12 MHz 40 MHz 38 98 to 41 02 MHz Note Duty Cycle and Pulse Width measurements are based on the same principles as Frequency measurements Therefore the Duty Cycle and Pulse Width measurement function will not be verified separately 4 5 5 Input B Frequency Measurement Accuracy Test Proceed as follows to test the Input B frequency measurement accuracy 1 Connect the test tool to the 5500A as shown in Figure 4 4 FLUKE 5500A CALIBRATOR ST8005 CGM Figure 4 4 Test Tool Input B to 5500A Scope Output 500 2 Select the following test tool setup e Press auro select auto ranging AUTO in top of display e Press MA to open the INPUT B MEASUREMENTS menu and choose INPUT B M ON MEASURE on B M Hz e Press E to open the SCOPE INPUTS menu e Press to open the TRIGGER menu and choose INPUT BM B SCREEN UPDATE M FREE RUN AUTO RANGE W gt 15HZ 3 Set the 5500A to source a leveled sine wave of 600 mV peak to peak SCOPE output MODE levsin 4 9 123 Service Manual 4 10 Set the 5500A frequency according to the first test point in Table 4 1 Observe the Input B main reading on the test tool and check to see if it is within the range shown under the appropriate column Continue through the test points When you are finished set the 5500A to Standby 4 5 6 Input B Frequency Response Upper Trans
113. ceed as follows to do the Zero Ohm calibration gy hs pipa hoe Es Press E to select calibration adjustment step Zero Ohm CL 0840 IDLE Make a short circuit between the Input A banana socket and the COM input Press E to start the Ohm Zero calibration of all ranges CL 0840 CL 0846 Wait until the display shows the calibration status Zero Ohm CL 0846 READY Remove the Input A to COM short Continue at Section 5 6 8 5 13 123 Service Manual 5 6 8 Gain Ohm Proceed as follows to do the Gain Ohm calibration 1 Press to select calibration adjustment step Gain Ohm CL 0860 IDLE 2 Connect the UUT to the 5500A as shown in Figure 5 8 Notice that the sense leads must be connected directly to the test tool FLUKE 5500A CALIBRATOR ST8003 CGM Figure 5 8 Four wire Ohms calibration connections 3 Set the 5500A to the first test point in Table 5 4 Use the 5500A COMP 2 wire mode for the calibration adjustments up to and including 100 kQ For the higher values the 5500A will turn off the COMP 2 wire mode 4 Set the 5500A to operate OPR 5 Press E to start the calibration 6 Wait until the display shows the calibration status READY 7 Press to select the next calibration step set the 5500A to the next calibration point and start the calibration Continue through all calibration points 8 When you are finished set the 5500A to Standby 9 Continue at Section 5 6 9 Table 5 4 Ohm Gain Cali
114. ction 5 7 8 24 Chapter 9 Circuit Diagrams Title Page 9 Introd ctioti soc nen RR ER RUBER MGR 9 3 9 2 Schematic DIA TAM iia ea 9 4 9 1 Circuit Diagrams 9 9 1 Introduction 9 1 Introduction This chapter contains all circuit diagrams and PCA drawings of the test tool There are no serviceable parts on the LCD unit Therefore no circuit diagrams and drawings of the LCD unit are provided Referring signals from one place to another in the circuit diagrams is done in the following way SIGNAL 5 C2 Figure 9 1 Circuit Diagram 1 Figure 9 5 Circuit diagram 5 The line SIGNAL on circuit diagram 1 location B3 1 B3 is connected to the line SIGNAL on circuit diagram 5 location C2 5 C2 If the signal is referred to a location on the same circuit diagram the circuit diagram number is omitted 9 3 123 Service Manual 9 2 Schematic Diagrams The tables below show where to find the parts on the Main PCA circuit diagrams and assembly drawings Separate tables are created for the Main PCA side 1 and side 2 assembly drawing B402 C4 4 J10 indicates that part B402 can be found in location C4 on the Main PCA side 1 drawing circuit diagram part 4 location J10 Table 9 1 Parts Location Main PCA Side 1 B402 B403 C101 C102 C104 C105 C106 C111 C112 C113 C114 C116 C117 C118 C119 C121 C122 C123 C124 C146 C181 C183 C187 C201 C202 C204 C205 C206 C211 C212 C213 C214
115. current to R558 This resulting voltage is a reference for the maximum allowable output voltage VOUTHI The 3V3A output voltage M3V3A is attenuated and level shifted in the P ASIC and then compared to the VOUTHI voltage If the 3V3A voltage exceeds the set limit FET V554 will be turned off The FREQPS control signal is converted to appropriate voltage levels for the FET switch V554 by the BOOST circuit The voltage VBAT supplies the BOOST circuit power via V553 and R561 The FREQPS signal is also supplied to the D ASIC in order to detect if the Fly Back converter is running well V551 and C552 limit the voltage on the primary winding of T552 when the FET V554 is turned of The signal SNUB increases the FLYGATE high level to decreases ON resistance of V554 less power dissipation in V554 i FLYSENSP R570 57 IMAXFLY 52 VCOIL l CONTROL 458 3V3A 51 VOUTHI R558 R552 COSC 43 T E R554 54 VSENS PUT 62 PWRONOFF R553 72 iREFP 1 23V _ POWER ASIC Figure 3 6 Fly Back Converter Block Diagram Slow ADC The Slow ADC enables the D ASIC to measure the following signals BATCUR BATVOLT BATTEMP BATIDENT Battery current voltage temperature type DACTEST A DACTEST B and DACTEST T test output of the C ASIC s and the T ASIC De multiplexer D531 supplies one of these signals to its output and to the input of comparator N531 TP536 The D ASIC supplies the selection control signals SELMUX
116. djustment Procedure uses built in calibration setups that can be accessed in the Maintenance mode To enter the Maintenance mode proceed as follows e Press and hold Ea e Press and release e Release ES e The display shows the Calibration Adjustment Screen The display shows the first calibration step Warming Up CL 0200 and the calibration status IDLE valid or IDLE invalid Calibration Adjustment 5 3 Starting Calibration Adjustment 4 Continue with either a or b below a To calibrate the display contrast adjustment range and the default contrast go to Section 5 4 Contrast Calibration Adjustment This calibration step is only required if the display cannot made dark or light enough or if the display after a test tool reset is too light or too dark b To calibrate the test tool without calibrating the contrast go to Section 5 5 Warming Up amp Pre calibration Explanation of screen messages and key functions When the test tool is in the Maintenance Mode only the F1 to F4 soft keys the ON OFF key and the backlight key can be operated unless otherwise stated The calibration adjustment screen shows the actual calibration step name and number and its status Cal Name CL nnnn Status Calibration step nnnn Status can be IDLE valid After re entering this step the calibration process is not started The calibration data of this step are valid This means that the last time this step was done th
117. e LCD unit and the KEYBOARD are located on one Printed Circuit Board PCB called the MAIN PCB The ASIC s are referred to as C ASIC Channel ASIC T ASIC Trigger ASIC P ASIC Power ASIC and D ASIC Digital ASIC 3 3 123 Service Manual 3 2 1 Channel A Channel B Measurement Circuits The Channel A and Channel B circuit are similar The only difference is that Channel A can do all measurements whereas Channel B does not provide resistance diode and capacitance measurements Volts and derived measurements e g current with optional probe The input voltage is supplied to the C ASIC via the LF and HF path The C ASIC converts attenuates amplifies the input signal to a normalized output voltage ADC A ADC B which is supplied to the Analog to Digital Converters ADC A and ADC B on the DIGITAL part The D ASIC acquires the digital samples to build the trace and to calculate readings For the HF and LF attenuation section of the C ASIC some external components are required the HF DECade ATTenuator and LF DECade ATTenuator section Resistance continuity and diode measurements Input A only The T ASIC supplies a current via the Q F relays to the unknown resistance Rx connected to the Input A and the COM input jacket The voltage drop across Rx is measured as for voltage measurements Capacitance measurements Input A only The T ASIC supplies a current via the Q F relays to the unknown capacitance Cx connect
118. e SCLK and SDAT serial control lines e g to select the required trigger source Various I O lines are provided e g to control the BUZZER and the Slow ADC via the SADC bus 3 2 4 Power Circuit 3 6 The test tool can be powered via the power adapter or by the battery pack If the power adapter is connected it powers the test tool and charges the battery via the CHARGER CONVERTER circuit The battery charge current is sensed by sense resistor Rs signal IBAT It is controlled by changing the output current of the CHARGER CONVERTER control signal CHAGATE If no power adapter is connected the battery pack supplies the VBAT voltage The VBAT voltage powers the P ASIC and is also supplied to the FLY BACK CONVERTER switched mode power supply If the test tool is turned on the FLY BACK CONVERTER generates supply voltages for various test tool circuits The 3 V3GAR supply voltage powers the D ASIC RAM and ROM If the test tool is turned off the battery supplies the 3 V3GAR voltage via transistor V569 This transistor is controlled by the P ASIC So when the test tool is turned off the D ASIC can still control the battery charging process CHARCURR signal the real time clock the on off key and the serial RS232 interface to turn the test tool on To monitor and control the battery charging process the P ASIC senses and buffers various battery signals as e g temperature TEMP voltage BATVOLT current IBAT Via the S
119. e calibration process was successful It does not necessarily mean that the unit meets the specifications related to this step IDLE invalid After re entering this step the calibration process is not started The calibration data are invalid This means that the unit will not meet the specifications if the calibration data are saved BUSY aaa bbb Calibration adjustment step in progress progress for Input A and Input B READY Calibration adjustment step finished Error xxxx Calibration adjustment failed due to wrong input signal s or because the test tool is defective The error codes xxxx are shown for production purposes only Functions of the keys F1 F4 are lS PREV select the previous step Fe NEXT select the next step EN CAL start the calibration adjustment of the actual step Fa EXIT leave the Maintenance mode Readings and traces After completing a calibration step readings and traces are shown using the new calibration data 123 Service Manual 5 4 Contrast Calibration Adjustment After entering the Maintenance mode the test tool display shows Warming Up CL 0200 IDLE valid Do not press E now If you did turn the test tool off and on and enter the Maintenance mode again Proceed as follows to adjust the maximum display darkness CL0100 the default contrast CL0110 and the maximum display brightness CL0120 1 10 5 6 Press a three times to select the first calibration step T
120. e mode is entered when the test tool is powered by the power adapter and is turned on The FLY BACK CONVERTER is on the CHARGER CONVERTER supplies the primary current If batteries are installed they will be charged In this mode a battery refresh see below can be done Operational mode The Operational mode is entered when the test tool is powered by batteries only and is turned on The FLY BACK CONVERTER is on the batteries supply the primary current If the battery voltage VBAT drops below 4V when starting up the fly back converter the Off mode is entered 3 7 123 Service Manual Battery Refresh In the following situations the batteries will need a deep discharge full charge cycle called a refresh e every 50 not full discharge charge cycles or each 6 months This prevents battery capacity loss due to the memory effect e after the battery has been removed as the test tool does not know the battery status then The user will be prompted for this action when he turns the test tool on directly following the start up screen A refresh cycle takes 16 hours maximum depending on the battery status It can be started via the keyboard USER OPTIONS Fl activate refresh if the test tool is on and the power adapter is connected During a refresh first the battery is completely charged then it is completely discharged the test tool is powered by the battery only and the power adapter must be connected and then it
121. e new shape is a transistor shape mounted on the Main PCA side 1 the reference designator becomes V302 The reason is the availability of the diode versions The PCB layout still has the possibility to mount V301 is place of V302 Note In some units having PCB version 8 the reference voltage diode can have the transistor shape and has reference designator V302 then In this case it is soldered on C312 see the adjacent figure and Figure 9 8 location C3 and V302 C312 Modifications 10 replaces V301 e A filter circuit has been added in the Slow ADC supply N532 pin 2 R532 C532 see the Power Circuit diagram figure 9 6 e A PCA version detection circuit has been added see the Digital Circuit diagram figure 9 4 e A filter circuit for VGARVAL has been added see the Digital Circuit diagram figure 9 4 The new parts numbers are listed in Table 8 3 10 3
122. ed the LCD backlight voltage on the wire cable is 400V when the test tool is on 4 Remove the two screws item 10 that secure the Main PCA unit to the top case 5 Lift the screw end of the Main PCA unit and remove the unit by gently wiggling the assembly from side to side as you pull backwards SHIELDING SLAP LCD P d TABS OF THE SHIELDING BACKLIGHT FLAT CABLE lt i PLATE INSIDE BOTH CABLE A SHIELDS KEYPAD FOIL 7 FLEX CABLE A ae ST8035 ST8035 EPS Figure 6 2 Flex Cable Connectors 6 5 123 Service Manual 6 2 6 Removing the Display Assembly Caution Read the Caution statement in Section 6 5 when installing the display assembly An incorrect installation can damage the display assembly There are no serviceable parts in the display assembly Referring to Figure 6 1 use the following procedure to remove the display assembly 1 Remove the main PCA unit see Section 6 2 5 2 The keypad pressure plate item 9 is captivated by four plastic keeper tabs in the top case Press the plate down carefully slide the plate to release it from the tabs and then remove it 3 Remove the display assembly item 6 To prevent finger contamination wear cotton gloves or handle the display assembly by its edge After removing the display assembly the shielding bracket item 5 with the conductive foam strip item 4 the dust seal item 3 and the shielding foil item 2 can be removed 6 2 7 Removin
123. ed to the Input A and the COM input jacket Cx is charged and discharged by this current The C ASIC converts the charging time and the discharging time into a pulse width signal This signal is supplied to the T ASIC via the C ASIC trigger output TRIG A The T ASIC shapes and levels the signal and supplies the resulting pulse width signal ALLTRIG to the D ASIC The D ASIC counts the pulse width and calculates the capacitance reading When the capacitance function is selected no other measurement or wave form display is possible There is only a numeric readout of the capacitance value Frequency pulse width and duty cycle measurements The input voltage is measured as described above From the ADC samples to built the trace also the frequency pulse width and duty cycle of the input signal are calculated Miscellaneous Control of the C ASIC e g selecting the attenuation factor is done by the D ASIC via the SDAT and SCLK serial communication lines An offset compensation voltage and a trace position control voltage are provided by the D ASIC via the APWM bus The C ASIC s also provide conditioned input voltages on the TRIG A TRIG B line These voltages can be selected as trigger source by the T ASIC 3 2 2 Trigger Circuit The T ASIC selects one of the possible trigger sources TRIG A Input A or TRIG B Input B For TV triggering the selected trigger source signal is processed via the Sync hronization Pulse Separator circuit
124. ence current Ical is supplied by the T ASIC via R144 for calibration of the resistance and capacitance measurement function For ICAL see also Section 3 3 3 POS input pin 1 The PWM circuit on the Digital part provides an adjustable voltage 0 to 3 3V to the POS input via R151 The voltage level is used to move the input signal trace on the LCD The REFN line provides a negative bias voltage via R152 to create the correct voltage swing level on the C ASIC POS input OFFSET input pin 44 The PWM circuit on the Digital part supplies an adjustable voltage 0 to 3 3V to the OFFSET input via R153 The voltage level is used to compensate the offset in the LF path of the C ASIC The REFN line provides a negative bias voltage via R152 to create the correct voltage swing level on the C ASIC POS input DACTEST output pin 24 As described above the DACTEST output is used for signaling a ground protect error It can also be used for testing purposes Furthermore the DACTEST output provides a C ASIC reset output signal 1 75V after a power on ADDRESS output pin 23 The output provides a replica of the input voltage to the SENSE line via R165 In capacitance mode the sense signal controls the CLAMP function in the T ASIC See Section 3 3 3 TRACEROT input pin 31 The TRACEROT signal is supplied by the T ASIC It is a triangle sawtooth voltage SDAT SCLK Control information for the C ASIC e g selection of the attenuation factor is sent
125. enu e Press E to open the TRIGGER menu and choose Bl VIDEO on A From the shown VIDEO TRIGGER menu choose SYSTEM B NTSC or B PAL or ll SECAM LINE B SELECT POLARITY W POSITIVE 4 23 123 Service Manual e Using 3 UN set the Input A sensitivity to 200 mV div e Using 53 select 20 us div e Press X to enable the arrow keys for selecting the video line number s Using B select the line number 622 for PAL or SECAM 525 for NTSC 3 Set the TV Signal Generator to source a signal with the following properties e the system selected in step 2 e gray scale e video amplitude 1V 5 divisions on the test tool e chroma amplitude zero 4 Observe the trace and check to see if the test tool triggers on line number 622 for PAL or SECAM see Figure 4 9 525 for NTSC see Figure 4 10 Note Numerical readings in the pictures shown below may deviate from those shown in the test tool display during verification e Je w VIDE fiz 00mU A 20usA fiz 00mU A 20us Trig A IN CON AE CONTRAST MOUE lt 399 PAL622 BMP NTSC525 BMP Figure 4 9 Test Tool Screen for PAL SECAM Figure 4 10 Test Tool Screen for NTSC line line 622 525 5 Using DU select the line number 310 for PAL or SECAM 262 for NTSC 6 Observe the trace and check to see if the test tool triggers on line number 310 for PAL or SECAM see Figure 4 11 line number 262 for NTSC see Figure 4 12 4 24 Performance Verification 4 4 5 I
126. er adapter input voltage gt 19V is supplied 7 15 123 Service Manual Ze Check TP487 for 3V supplied by D471 7 5 12 RAM Test You can use the Microsoft TERMINAL program to test the RAM Proceed as follows 1 Connect the Test Tool to a PC via the Optical Interface Cable PM9080 2 Start the Terminal program and select the following Settings Terminal Emulation TTY Generic Terminal Preferences Terminal Modes CR gt CR LF Line Wrap Inbound Local Echo O Outbound Sound Communications Baud Rate 9600 Data Bits 8 Stop Bits 1 Parity None Flow Control Xon Xoff Connector COMn 3 Turn the test tool off Keep the keys eb pressed and turn the test tool on again This will start up the mask software You will hear a very weak beep now 4 In the terminal program type capital characters X no ENTER After a number of characters the test tool mask software will respond with an acknowledge 0 zero This indicates that the communication between the Terminal program and the test tool is accomplished 5 Type ID and press Enter The test tool will return an acknowledge 0 zero and the string Universal Host Mask software UHM V2 1 If it does not check the Terminal program settings the interface connection and the test tool Optical Port Section 7 5 5 6 Type EX10 4H400000 4H20000 and press Enter The test tool will return one of the following acknowledges 0 the RAM is OK 1 syntax error in the typed command 6 the RAM d
127. erence Description Designator R406 R407 R408 R409 R410 R416 R417 R431 R432 R433 R434 R436 R438 R439 R441 R442 R453 R454 R466 R467 R469 R470 R471 R472 R473 R474 R478 R479 R480 R481 R482 R482 R483 R483 RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RC12H 1 RC12H 1 RC11 2 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 RC12H 1 511E 3K16 10M 26K1 68E1 1E 1E 21K5 147K 147K 147K 26K1 147K 21K5 3K16 1K47 21K5 1E 1E 1E 100K 0E 1M 1M 100E 100E 10K 51K1 10K 10K 10K 511E 100K SMD RES 51K1 1 TC100 0805 5322 117 12451 5322 117 12465 4822 051 20106 5322 117 12448 5322 117 12454 5322 117 12472 5322 117 12472 5322 117 12477 5322 117 12478 5322 117 12478 5322 117 12478 5322 117 12448 5322 117 12478 5322 117 12477
128. est tool 3 Power the test tool via the power adapter input using a 20V 1V 0 5A DC supply For this purpose a special supply cable see Figure 5 10 can be ordered refer to Section 8 7 for the ordering number ee eee TRED gt i WHITE Figure 5 10 20 V Supply Cable for Calibration CAUTION To avoid damaging the test tool be sure to apply the polarity and voltage level of the 20V supply voltage correctly 4 Press EXIT The test tool will display Calibration data is valid Save data and EXIT maintenance Note Calibration data valid indicates that the calibration adjustment procedure is performed correctly It does not indicate that the test tool meets the characteristics listed in Chapter 2 Calibration Adjustment 5 7 Save Calibration Data and Exit 4 Press YES to save and exit Notes The calibration number and date will be updated only if the calibration data have been changed and the data are valid The calibration data will change when a calibration adjustment has been done The data will not change when just entering and then leaving the maintenance mode without doing a calibration adjustment The calibration number and date will NOT be updated if only the display contrast has been adjusted Possible error messages The following messages can be shown on the test tool display WARNING Calibration data NOT valid Save data and EXIT Proceed as follows e Toreturn to
129. f the test tool is turned on 3 3 3 Trigger Circuit The description refers to circuit diagram Figure 9 3 The trigger section is built up around the T ASIC OQ0257 It provides the following functions e Triggering trigger source selection trigger signal conditioning and generation of trigger information to be supplied to the D ASIC e Current source for resistance and capacitance measurements e Voltage reference source buffering and generation of reference voltages e AC DC relay and Resistance Capacitance Q F relay control 3 20 Circuit Descriptions 3 3 3 Detailed Circuit Descriptions Triggering Figure 3 10 shows the block diagram of the T ASIC trigger section E K ALLTRIG Eeo TRIGQUAL ALLTRIG select synchronize 34 pume gc deiat f TRIGDT t 3 HOLDOFF 38 i SMPCLK 2 DACTEST analog E 1 trigger path colour filter amplifier separator Figure 3 10 T ASIC Trigger Section Block Diagram In normal trigger modes not TV triggering the analog trigger path directly uses the Input A TRIG A or Input B TRIG B signal for triggering In the TV trigger mode the analog trigger path uses the TVSYNC signal for triggering This signal is the synchronization pulse derived from the TRIGA or TRIGB composite video signal The color filter amplify section in the T ASIC blocks the color information and amplifies and inverts if required the video signal The TVOUT ou
130. following test tool setup e Press to select auto ranging AUTO in top of display e Press ES to open the INPUT A MEASUREMENTS menu and choose MEASURE on A B CONT Set the 5500A to 25Q Use the 5500A COMP 2 wire mode Listen to hear that the beeper sounds continuously Set the 5500A to 35Q Listen to hear that the beeper does not sound When you are finished set the 5500A to Standby 4 21 123 Service Manual 4 22 4 5 17 Diode Test Function Test Proceed as follows to test the Diode Test function 1 2 h R cp con Connect the test tool to the 5500A as for the previous test see Figure 4 7 Press Ea to open the INPUT A MEASUREMENTS menu and choose MEASURE on A B DIODE Set the 5500A to 1 KO Use the 5500A COMP 2 wire mode Observe the main reading and check to see if it is within 0 425 and 0 575V Set the 5500A to 1V DC Observe the main reading and check to see if it is within 0 975 and 1 025V When you are finished set the 5500A to Standby 4 5 18 Capacitance Measurements Test Proceed as follows 1 SS A 9o Connect the test tool to the 5500A as for the previous test see Figure 4 7 Ensure that the 5500A is in Standby Select the following test tool setup e Press ax to open the INPUT A MEASUREMENTS menu and choose MEASURE on A B CAP e Press to select auto ranging AUTO in top of display e Press 9 to open the INPUT A MEASUREMENTS menu e Press the select
131. g For capacitance measurements the ADC output is not used but the TRIG A output pulse length indicates the measured capacitance see Capacitance measurements below GPROT input pin 2 PTC Positive Temperature Coefficient resistors R106 R206 are provided between the Input A and Input B shield ground and the COM input instrument ground This prevents damage to the test tool if the various ground inputs are connected to different voltage levels The voltage across the PTC resistor is supplied via the GPROT input pin 2 to an input buffer If this voltage exceeds 200 mV the ground protect circuit in the C ASIC makes the DACTEST output pin 24 high The DACTEST line output level is read by the D ASIC via the slow ADC See 3 3 2 Power The test tool will give a ground error warning Because of ground loops a LF interference voltage can arise across PTC resistor R106 mainly mains interference when the power adapter is connected To eliminate this LF interference voltage it is buffered also via input GPROT pin 2 and subtracted from the input signal Pin 43 PROTGND is the ground reference of the input buffer Circuit Descriptions 3 3 3 Detailed Circuit Descriptions CALSIG input pin 36 The reference circuit on the TRIGGER part supplies an accurate 1 23V DC voltage to the CALSIG input pin 36 via R141 This voltage is used for internal calibration of the gain and the capacitance measurement threshold levels A refer
132. g an acquisition cycle ADC samples are acquired to complete a trace on the LCD Numerical readings METER readings are derived from the trace So in single shot mode a new reading becomes available when a new trace is started The test tool software starts an acquisition cycle The D ASIC acquires data from the ADC and stores them internally in a cyclic Fast Acquisition Memory FAM The D ASIC also makes the HOLDOFF line low to enable the T ASIC to generate the trigger signal TRIGDT The acquisition cycle is stopped if the required number of samples is acquired From the FAM the ADC data are moved to the RAM D475 The ADC data stored in the RAM are processed and represented as traces and readings Triggering HOLDOFF TRIGDT Randomize To start a new trace the D ASIC makes the HOLDOFF signal low Now the T ASIC can generate the trigger signal TRIGDT For signal frequencies higher than the system clock frequency and in the random repetitive sampling mode no fixed time relation between the HOLDOFF signal and the system clock is allowed The RANDOMIZE circuit desynchronizes the HOLDOFF from the clock by phase modulation with a LF ramp signal Trigger qualifying ALLTRIG TRIGQUAL The ALLTRIG signal supplied by the T ASIC contains all possible triggers For normal triggering the T ASIC uses ALLTRIG to generate the final trigger TRIGDT For qualified triggering e g TV triggering the D ASIC returns a qualified e g each n trigger pul
133. g the Keypad and Keypad Foil Referring to Figure 6 1 use the following procedure to remove the keypad and the keypad foil 1 Remove the display assembly see Section 6 2 6 2 Remove the keypad foil Notice the four keypad foil positioning pins in the top case 3 Remove the keypad Caution To avoid contaminating the keypad contacts and the keypad foil contacts with oil from your fingers do not touch the contacts or wear gloves Contaminated contacts may not cause immediate instrument failure in controlled environments Failures typically show up when contaminated units are operated in humid areas 6 3 Disassembling the Main PCA Unit Referring to Figure 6 3 use the following procedure disassemble the main PCA unit 1 Remove the M2 5 Torx screws items 1 and 8 that secure the main shielding plate item 7 to the main PCA shielding box item 5 2 Pull the shielding plate away from the input banana jacks as you rotate the far end upwards and then remove it Remove the power input insulator item 3 and the LED guide piece item 6 4 Remove the M2 5 Torx screws item 2 that secure the PCA to the shielding box Lift the PCA at the screw end approximately 2 cm and pull it away from the input banana jack holes to remove it 6 6 Disassembling the Test Tool 6 3 Disassembling the Main PCA Unit Note Each input banana jacket is provided with a rubber sealing ring Input A B item 9 COM input item 10 Ensure that t
134. gger level is the top of the trigger icon T e Press Eg to open the SCOPE INPUTS menu e Press 21 to open the SCOPE OPTIONS menu and choose SCOPE MODE M SINGLE SHOT WAVEFORM MODE M NORMAL Set the 5500A to source 0 4V DC Verify that no trace is shown on the test tool display and that the status line at the display bottom shows Wait A T If the display shows the traces and status Hold A J then press to re arm the test tool for a trigger Increase the 5500A voltage slowly in 0 1V steps using the 5500A EDIT FIELD function until the test tool is triggered and the traces are shown Verify that the 5500A voltage is between 1 5V and 2 5V when the test tool is triggered To repeat the test start at step 3 Set the 5500A to Standby Press to clear the display Press ito enable the arrow keys for Trigger Level and Slope adjustment a Using 00 select negative slope triggering L Using DC set the trigger level to 2 divisions from the screen center For negative slope triggering the trigger level is the bottom of the trigger icon L Set the 5500A to source 3V DC Verify that no trace is shown on the test tool display and that the status line at the display bottom shows Wait A L If the display shows the traces and status Hold A L then press to re arm the test tool for a trigger Decrease the 5500A voltage slowly in 0 1V steps using the 5500A EDIT FIELD function until the test tool is triggered and the traces
135. he D ASIC controls the transmit data line TXD If the line is low diode H521 will emit light The supply voltage for the optical interface receive circuit RXDA is the 3 V3SADC voltage The 3 V3SADC voltage is present if the test tool is turned on or if the Power Adapter is connected or both So if the Power Adapter is present serial communication is always possible even when the test tool 1s off Backlight Converter The LCD back light is provided by a 22 4 mm fluorescent lamp in LCD unit The back light converter generates the 300 400 Vpp supply voltage The circuit consist of e A pulse width modulated PWM buck regulator to generate a variable regulated voltage V600 V602 L600 C602 e A zero voltage switched ZVS resonant push pull converter to transform the variable regulated voltage into a high voltage AC output V601 T600 The PWM buck regulator consists of FET V600 V602 L600 C602 and a control circuit in N600 FET V600 is turned on and off by a square wave voltage on the COUT output of N600 pin 14 By changing the duty cycle of this signal the output on C602 provides a variable regulated voltage The turn on edge of the COUT signal is synchronized with each zero detect Outputs AOUT and BOUT of N600 provide complementary drive signals for the push pull FETs V601a b dual FET If V601a conducts the circuit consisting of the primary winding of transformer T600 and C608 will start oscillating at its reson
136. he MAINVAL signal pin91 is supplied by the P ASIC and indicates the presence of the power adapter voltage high present The FREQPS signal pin 93 is also supplied by the P ASIC It is the same signal that controls the Fly Back Converter control voltage FLYGATE The D ASIC measures the frequency in order to detect if the Fly Back Converter is running within specified frequency limits D ASIC Clocks A 25 MHz crystal B403 controls the D ASIC system clock For the real time clock counting the time and date an additional 32 768 kHz crystal B401 is provided When the test tool is turned on a 16MHz microprocessor clock derived from B402 becomes active Buzzer The Buzzer is directly driven by a 4 kHz square wave from the D ASIC pin 101 via FET V522 If the test tool is on the 30VD supply from the Fly Back converter is present and the buzzer sounds loudly Ifthe 30VD is not present the buzzer sounds weak e g when the Mask Active mode is entered Chapter 4 Performance Verification Title Page 4 1 Introductiott TT 4 3 4 2 Equipment Required For Verification sese sese 4 3 AS How TO Verlby i onde titer atr et eee e err tete tse temi 4 3 4 4 Display and Backlight Test 4 4 4 5 Input A and Input B Tests ssssssessesseeeeeeennen ener enne 4 5 4 5 1 Input A and B Base Line Jump Test sees 4 6 4 5 2 Input A Trigger Sensitivity Test 4 7 4 5 3 Input A Frequency Response Upper Transition Point Test
137. he display shows Contrast CL 0100 MANUAL Press JCAL The display will show a dark test pattern see Figure 5 2 Using DC adjust the display to the maximum darkness at which the test pattern 1s only just visible Press to select the default contrast calibration The display shows Contrast CL 0110 MANUAL Press CAL The display shows the test pattern at default contrast Using DC set the display to optimal becomes default contrast Press to select maximum brightness calibration The display shows Contrast CL 0120 MANUAL Press CAL The display shows a bright test pattern Using DO adjust the display to the maximum brightness at which the test pattern is only just visible You can now e Exit if only the Contrast had to be adjusted Continue at Section 5 7 OR e Do the complete calibration Press to select the next step Warming Up and continue at Section 5 5 Figure 5 2 Display Test Pattern Calibration Adjustment 5 5 Warming Up amp Pre Calibration 5 5 Warming Up amp Pre Calibration After entering the Warming Up amp Pre Calibration state the display shows WarmingUp CL 0200 IDLE valid or invalid You must always start the Warming Up amp Pre Calibration at Warming Up CL0200 Starting at another step will make the calibration invalid Proceed as follows 1 Remove all input connections from the test tool 2 Press E to start the Warming Up amp Pre Calibration The displ
138. he rings are present when reassembling the main PCA unit Caution To avoid contaminating the main PCA with oil from your fingers do not touch the contacts or wear gloves A contaminated PCA may not cause immediate instrument failure in controlled environments Failures typically show up when contaminated units are operated in humid areas ST8015 CGM 6 3 Main PCA Unit Assembly 123 Service Manual 6 4 Reassembling the Main PCA Unit Reassembling the main PCA is the reverse of disassembly However you must follow special precautions when reassembling the main PCA unit 1 Ensure the input banana jacks have the rubber sealing ring in place Input A B item 9 COM input item 10 see Figure 4 6 2 Do not forget to install the power connector insulator item 3 and the LED holder item 6 3 Notice the correct position of the shielding box main PCA notice the shielding plates on the PCA and shielding plate as shown in Figure 6 2 The tabs of the shielding plate must be inside both shields 6 5 Reassembling the Test Tool Reassembling the test tool is the reverse of disassembly However you must follow special precautions when reassembling the test tool Refer also to figure 6 1 Caution The first shipped units are provided with a yellow tube on the two notches with the screw inserts at the top in the top case The reason for this is that the display assembly in these units is smaller than in the
139. hield of the input is connected to system ground L via a PTC ground protection resistor If a voltage is applied between the Input A and Input B ground shield or between one of these ground shields and the black COM input the PTC resistor will limit the resulting current The voltage across the PTC resistor is supplied to the C ASIC GPROT input and causes a ground error warning high voltage level on output pin 24 DACTEST Resistance Measurements Channel A The unknown resistance Rx is connected to Input A and the black COM input The T ASIC supplies a constant current to Rx via relay contacts K173 and the PTC resistor R172 The voltage across Rx is supplied to a high impedance input buffer in the C ASIC via the LF input pin 42 The C ASIC conditions the voltage across Rx to an output voltage of 50 mV div This voltage is supplied to the ADC on the Digital part The ADC data is read and processed by the D ASIC and represented as a numerical reading and a graphical trace in a fixed time base Table 3 4 shows the relation between the reading range Q the trace sensitivity Q div and the current in Rx The selected trace sensitivity determines the C ASIC attenuation gain factor The reading range is only a readout function it does not change the hardware range or the wave form display Table 3 4 Ohms Ranges Trace Sensitivity and Current soa soa sa swa 500K soma Sensitivity div 200 2000 20 KQ 200 kQ 10 MQ To pr
140. hielded test leads 60 Hz 6 Hz with 10 1 probe 1 5 50 Hz 5 Hz with 10 1 probe 2 33 Hz 3 3 Hz with 10 1 probe 5 10 Hz 1 Hz with 10 1 probe 30 DC Rejection only VAC gt 50 dB Common Mode Rejection CMRR gt 100 dB DC gt 60 dB 50 60 or 400 Hz Full Scale Reading 5000 counts The reading is independent of any signal crest factor Move influence 6 counts max Peak Modes Max peak Min peak or pk to pk Ranges 500 mV 5V 50V 500V 1250V Accuracy Max peak or Min peak 5 of full scale Peak to Peak 10 of full scale Full Scale Reading 500 counts Frequency Hz Ranges 1Hz 10Hz 100Hz 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz 40 MHz Frequency Range for Continuous Autoset 15Hz 1Hz to 30 MHz Accuracy 1Hz to 1 MHz 0 5 2 counts 1 MHz to 10 MHz 1 0 2 counts 10 MHz to 40 MHz 2 5 2 counts Full Scale Reading 10 000 counts 2 6 Duty Cycle DUTY Range Frequency Range for Continuous Autoset Accuracy 1Hz to 1 MHz 1 MHz to 10 MHz 10 MHz to 40 MHz Resolution Pulse Width PULSE Frequency Range for Continuous Autoset Accuracy Q1Hz to 1 MHz 1 MHz to 10 MHz 1910 MHz to 40 MHz Full Scale reading Amperes AMP Ranges Scale Factor Accuracy Temperature TEMP Range Scale Factor Accuracy Decibel dB 0 dBV 0 dBm 6009 50 2 dB on Full Scale Reading Crest Factor CREST Range Accuracy Full Scale Reading Phase Modes Range Accuracy Resolution
141. ibration point in Table 5 1 Set the 5500A in operate OPR Press j to start the calibration Wait until the display shows calibration status READY DN ES Press to select the next calibration step set the 5500A to the next calibration point and start the calibration Continue through all calibration points in Table 5 1 8 Set the 5500A to source a 1 kHz square wave Output SCOPE MODE wavegen WAVE square to the first calibration point in Table 5 2 9 Press to select the first step in Table 5 2 10 Press to start the calibration 11 Wait until the display shows calibration status READY 12 Press to select the next calibration step set the 5500A to the next calibration point and start the calibration Continue through all calibration points Table 5 2 13 When you are finished set the 5500A to Standby 14 Continue at Section 5 6 2 Table 5 1 HF Gain Calibration Points Fast Cal step 5500A Setting Test Tool Input Signal T Requirements T 1 kHz no 1 KHz tise lt 100 ns 500 flatness after rising edge 0 596 after 200 ns HFG amp FI AB CL 0604 HFG amp FI AB CL 0606 2 5V HFG 8 FI AB CL 0607 HFG amp FI A CL 0608 HFG amp FI B CL 0628 D As the 5500A output is not terminated with 500 its output voltage is two times its set voltage 2 After starting the first step in this table cell these steps are done automatically Calibration Adjustment 5 6 Final Calibration Table 5 2 HF
142. ight brightness increases with an increasing length of the high pulse Check V604 R604 Measure the voltage on the collctro of V605 correct voltage 1 5 V 1 5 V N600 defect 1 5 V secundary circuit defect V606 V603 replace both if one is defective 7 5 2 Fly Back Converter 1 Check the voltages on TP572 5V TP573 3 3V TP574 3 3V TP576 3 3V TP577 30V on the POWER part a Ifone or more voltages are correct then check the rectifier diodes V561 V564 and coils L562 L567 of the incorrect voltage b Ifnone ofthe voltages is correct then the fly back converter does not run correctly continue at step 2 Check TP504 VBATT for gt 4 8V Check TP552 FLYGATE for a square wave voltage of at least some volts for a correct Fly Back Converter 50 100 kHz z10 Vpp a Ifa square wave is present on TP552 may be not the correct value then 1 Check the voltage on N501 pin 55 FLYSENSP For a correct converter this 1s a saw tooth voltage of 50 100 kHz 50 150 mVpp E ai zer 50 150 mV a Ifno sawtooth voltage is present on R501 no current or a DC current flows in FET V554 The primary coil or V554 may be defective or interrupted connections Check R504 R506 R507 battery current sense resistors these resistors may be fused due to a short in FET V554 b Ifanincorrect sawtooth is present on R501 this can be caused by overloaded outputs Frequency low e g
143. illed now When a column is full the LINECLK signal transfers the data to the column driver outputs Via the common drivers the LINECLK also selects the next column to be filled So after 240 column clocks a full screen image is built up on the LCD The LCD unit generates various voltage levels for the LCD drivers outputs to drive the LCD The various levels are supplied to the driver outputs depending on the supplied data and the M ultiplex signal The M signal back plane modulation is used by the LCD drivers to supply the various DC voltages in such an order that the average voltage does not contain a DC component A DC component in the LCD drive voltage may cause memory effects in the LCD The LCD contrast is controlled by the CONTRAST voltage This voltage is controlled by the D ASIC which supplies a PWM signal pin 37 CONTR D to PWM filter R436 C436 The voltage REFPWM1 is used as bias voltage for the contrast adjustment circuit on the LCD unit To compensate for contrast variations due to temperature variations a temperature dependent resistor is mounted in the LCD unit It is connected to the LCDTEMPI line The resistance change which represents the LCD temperature is measured by the D ASIC via the S ADC on the POWER part The back light lamp is located at the left side of the LCD so this side becomes warmer than the right side As a result the contrast changes from left to right To eliminate this unwanted effect the CONTRAST cont
144. isturbance with STL120 See Table 2 1 and Table 2 2 Table 2 1 No Visible Trace Disturbance No visible disturbance E 3 V m E 10 V m Frequency range 10 kHz to 27 MHz 50 mV div to 500 V div 500 mV div to 500 V div Frequency range 27 MHz to 1 GHz 50 mV div to 500 V div 50 mV div to 500 V div Table 2 2 Trace Disturbance lt 10 Disturbance less than 10 of full scale E 3 V m E 10 V m Frequency range 10 kHz to 27 MHz 10 mV div to 20 mV div 50 mV div to 200 mV div em range 2 MHz to 1 GHz 5 mV div to 20 mV div no visible disturbance Test tool ranges not specified in Table 2 1 and Table 2 2 may have a disturbance of more than 10 of full scale Multimeter disturbance See Table 2 3 e VDC VAC and VAC DC with STL 120 and short ground lead e OHM CONT DIODE and CAP with STL120 and black test lead to COM Table 2 3 Multimeter Disturbance lt 1 Disturbance less than 1 of full scale E 3 Vim E 10 V m Frequency range 10 kHz to 27 MHz VDC VAC VAC DC 500 mV to 1250V 500 mV to 1250V OHM CONT DIODE 5000 to 30 MQ 5000 to 30 MQ CAP 50 nF to 500 uF 50 nF to 500 uF Frequency range 27 MHz to 1 GHz VDC VAC VAC DC 500 mV to 1250V 500 mV to 1250V OHM CONT DIODE 5000 to 30 MQ 5000 to 30 MQ CAP 50 nF to 500 uF 50 nF to 500 uF Test tool ranges not specified in Table 2 3 may have a disturbance of more than 10 of full scale Chapter 3 Circuit Descriptions Title Page O NS 3 3 3 21Block Dis tios 3 3 3 2 1 Channel
145. ition Point Test Proceed as follows to test the Input B frequency response upper transition point 1 2 xx ON oh wm Connect the test tool to the 5500A as for the previous test see Figure 4 4 Select the following test tool setup e Turn Input B on if not already on e Press to select auto ranging AUTO in top of display Do not press anymore s Using A US change the sensitivity to select manual sensitivity ranging and lock the Input B sensitivity on 200 mV div e Press to open the SCOPE INPUTS menu e Press to open the TRIGGER menu and choose INPUT B B SCREEN UPDATE M FREE RUN AUTO RANGE B gt 15HZ Set the 5500A to source a leveled sine wave of 1 2V peak to peak 50 kHz SCOPE output MODE levsin Adjust the amplitude of the sine wave to 6 divisions on the test tool display Set the 5500A to 20 MHz without changing the amplitude Observe the Input B trace check to see if it is 2 4 2 divisions When you are finished set the 5500A to Standby Note The lower transition point is tested in Section 4 5 11 4 5 7 Input B Trigger Sensitivity Test Proceed as follows to test the Input B trigger sensitivity 1 2 Connect the test tool to the 5500A as for the previous test see Figure 4 4 Select the following test tool setup e Tur Input B on if not already on e Press to select auto ranging AUTO in top of display Do not press j anymore e Using 5 3 change the sensitivity to se
146. l combiscrew M3x10 5322 502 21507 X O bail 5322 466 10975 gt main PCA unit assembly No firmware loaded 5322 216 04048 Not calibrated Qu Ni Cd n Note The test tool contains a Nickel Cadmium battery item 13 Do not mix with the solid wastestream Spent batteries should be disposed of by a qualified recycler or hazardous materials handler 8 List of Replaceable Parts 8 3 Final Assembly Parts ST8014 EPS Figure 8 1 Fluke 123 Final Assembly 8 5 123 Service Manual 8 4 Main PCA Unit Parts See Table 8 2 and Figure 8 2 for the Main PCA Unit parts Table 8 2 Main PCA Unit screw M2 5x5 5322 502 21206 combiscrew M3x10 5322 502 21507 insulator for power input 5322 325 10163 main PCA shielding box 5322 466 10976 guide piece for optical gate LEDs 5322 256 10201 main PCA shielding plate 5322 466 10964 screw M2 5x16 5322 502 14132 oO Oo N O OC CO NN O ring 17 mm Input A B 5322 530 10272 o O ring 12 mm COM input 5322 530 10273 Note If the main PCA must be replaced you must order the complete Main PCA Unit ST8015 Figure 8 2 Main PCA Unit ST8015 CGM 8 6 8 5 Main PCA Parts See Figure 9 6 and Figure 9 7 at the end of Chapter 9 for the Main PCA drawings Table 8 3 Main PCA Ordering Code List of Replaceable Parts 8 5 Main PCA Parts Remarks Reference Description Designator Led Holder for H5
147. l powered installed and test tool on by batteries 3 3 Detailed Circuit Descriptions 3 3 1 Power Circuit The description below refers to circuit diagram Figure 9 5 Power Sources Operating Modes Figure 3 3 shows a simplified diagram of the power supply and battery charger circuit SUPPLY FLY BACK CONVERTER 8V3GAR VBAT EN FROM POWER CHARGER CONVERTER R503 VBATSUP 60 69 66 E ADAPTER L d ert V506 L501 z i _ R513 VBATHGH 7 Vref R501 78 BATVOLT 79 BATTEMP epe mm i Level shift 1 l 77 BATCUR 80 CHARCURR pes e Z R514 IIMAXCHA 6 Ios R502 VCHORIVE 19 12 aes MAINVAL LV566 E C502 Pd 18 PCHA 1 linear regulator linear regulator POWER ASIC Figure 3 3 Power Supply Block Diagram 3 9 123 Service Manual As described in Section 3 2 5 the test tool operating mode depends on the connected power source The voltage VBAT is supplied either by the power adapter via V506 L501 or by the battery pack It powers a part of the P ASIC via R503 to pin 60 VBATSUP If the test tool is off the Fly Back Converter is off and VBAT powers the D ASIC via transistor V569 3V3GAR This 3 V3GAR voltage is controlled and sensed by the P ASIC If it is NOT OK lt 3 05V the output VGARVAL pin 64 is low The VGARVAL line is connected to the D ASIC and if the line is lo
148. l occur on both a positive or a negative glitch This mode ensures triggering when the polarity of an expected glitch is not known 2 Qualified triggering e g TV triggering The ALLTRIG signal is supplied to T ASIC output pin 35 which is connected to the D ASIC input pin 21 The D ASIC derives a qualified trigger signal TRIGQUAL 3 21 123 Service Manual 3 22 from ALLTRIG e g on each 10th ALLTRIG pulse a TRIGQUAL pulse is given The TRIGQUAL is supplied this to the synchronize delta T circuit via the select logic 3 Normal triggering The ALLTRIG signal is supplied to the synchronization delta T circuit The ALLTRIG signal includes all triggers It is used by the D ASIC for signal analysis during AUTOSET Traditionally a small trigger gap is applied for each the trigger level In noisy signals this small gap triggering would lead to unstable displaying of the wave form if the noise is larger than the gap The result is that the system will trigger randomly This problem is solved by increasing the trigger gap TRIGLEV1 TRIGLEV2 automatically to 80 10 to 90 of the input signal peak to peak value This 80 gap is used in AUTOSET Note The ALLTRIG signal is also used for frequency pulse width and capacitance measurements Section 3 3 2 The Synchronize Delta t part provides an output pulse TRIGDT The front edge of this pulse is the real trigger moment The pulse width is a measure for the time between the trigge
149. later units All display assemblies supplied as spare part are of the latest type and do not need the yellow tubes in the top case e Remove the tube from both notches when installing a new display assembly e Transfer the tubes to the new top case if you replace a top case that has the tubes installed and you re install the unit s original display assembly Reassembling procedure for a completely disassembled unit 1 Clean the inside of the lens with a moist soft cloth if necessary Keep the lens free of dust and grease 2 Install the keypad Press the edge of the keypad into the sealing groove of the top case Ensure that the keypad lays flat in the top case and that all keys are correctly seated 3 Install the shielding foil item 2 Remove the protection foil from the shielding foil by pulling it off in one rapid movement If you pull it off slowly the protection foil may crack Keep the shielding foil free of dust and grease 4 Install the dust seal item 3 Install the display shielding bracket item 5 provided with the conductive foam strip item 4 Note Figure 6 4 shows how the shielding bracket with conductive foam strip the shielding foil the dust seal and the display assembly see step 7 are clamped in the top cover edge 6 Install the keypad foil Align the positioning holes in the keypad foil to the positioning pins in the top case 6 8 10 11 Disassembling the Test Tool 6 5 Reassem
150. lect manual sensitivity ranging and lock the Input B sensitivity on 200 mV div e Press to open the SCOPE INPUTS menu Performance Verification 4 4 5 Input A and Input B Tests e Press to open the TRIGGER menu and choose INPUT M B SCREEN UPDATE M FREE RUN AUTO RANGE B gt 15HZ 3 Setthe 5500A to source a 5 MHz leveled sine wave of 100 mV peak to peak SCOPE output MODE levsin 4 Adjust the amplitude of the sine wave to 0 5 division on the display 5 Verify that the signal is well triggered If it is not press to enable the up down arrow keys for Trigger Level adjustment adjust the trigger level and verify that the signal will be triggered now The trigger level is indicated by the trigger icon J Set the 5500A to source a 25 MHz leveled sine wave of 400 mV peak to peak Adjust the amplitude of the sine wave 1 5 divisions on the test tool display 8 Verify that the signal is well triggered If it is not press to enable the up down arrow keys for Trigger Level adjustment adjust the trigger level and verify that the signal will be triggered now 9 Set the 5500A to source a 40 MHz leveled sine wave of 1 8V peak to peak 10 Adjust the amplitude of the sine wave to exactly 4 divisions on the test tool display 11 Verify that the signal is well triggered If it is not press to enable the up down arrow keys for Trigger Level adjustment adjust the trigger level and verify that the signal will be triggered n
151. low via PTC resistor R172 on the Channel A part V358 V359 V353 V354 to ground The resulting voltage across the diodes is approximately 2V or 15V R354 R356 and V356 V357 limit the voltage on the T ASIC GENOUT output pin 1 The BOOTSTRAP output signal on pin 3 is the buffered GENOUT signal on pin 1 or the buffered SENSE signal on pin 59 It is supplied to the protection diodes via R352 R353 and to protection transistor V356 to minimize leakage currents On the ICAL output of the T ASIC pin 5 a copy of the output current on GENOUT is available The current is supplied to the Channel A C ASIC via R144 ICAL shows the same time temperature drift as the GENOUT measurement current it can be used for internal calibration of the resistance and capacitance measurement function Capacitor C356 is use for hum noise suppression Square Wave Voltage Generator For Probe Adjustment For probe adjustment a voltage generator circuit in the T ASIC can provide a 2 5Vpp 760Hz square wave voltage via the GENOUT output pin to the Input A connector Capacitor C357 is the external timing capacitor for the generator 3 23 123 Service Manual 3 24 Reference Voltage Circuit This circuit derives several reference voltages from the 1 23V main reference source 3 3V REFPWVe 73 N i 1 23V 3 3V 1 23V 0 1V 1 6V Figure 3 12 Reference Voltage Section The output of an amplifier in the P ASIC supplies a current to
152. lue Gain DMM CL0800 12 5 mV Gain DMM CL0803 125 mV Gain DMM CL0804 250 mV Gain DMM CL0805 500 mV Gain DMM CL0806 1 25V Gain DMM CL0809 12 5V Gain DMM CL0811 50V set 5500A to OPR Gain DMM CL0812 125V Gain DMM CL0813 250V 9 Press to select calibration step Gain DMM CL0814 IDLE 5 12 Calibration Adjustment 5 6 Final Calibration 10 Connect the test tool to the 5500A as shown in Figure 5 7 11 12 13 14 15 16 FLUKE 5500A CALIBRATOR ST8129 CGM Figure 5 7 Volt Gain Calibration Input Connections 500V Set the 5500A to supply a DC voltage of 500V Set the 5500A to operate OPR Press to start the calibration Gain DMM CL0814 and Gain DMM CL0815 will be calibrated now Wait until the display shows calibration status Gain DMM CL0815 READY Set the 5500A to OV zero and to Standby Continue at Section 5 6 6 5 6 6 Volt Zero Proceed as follows to do the Volt Zero calibration 1 2 3 4 5 6 Press 223 to select calibration adjustment step Volt Zero CL 0820 IDLE Terminate Input A and Input B with the BB120 and a 50Q or lower termination Press E to start the zero calibration of all mV d settings CL0820 CL0835 Wait until the display shows Volt Zero CL 0835 READY Remove the 50 2 terminations from the inputs Continue at Section 5 6 8 For firmware version V01 00 continue at Section 5 6 7 5 6 7 Zero Ohm firmware V01 00 only Pro
153. mbol indicates a device that may be damaged by static discharge 8 2 How to Obtain Parts Contact an authorized Fluke service center To locate an authorized service center refer to the second page of this manual back of the title page In the event that the part ordered has been replaced by a new or improved part the replacement will be accompanied by an explanatory note and installation instructions if necessary To ensure prompt delivery of the correct part include the following information when you place an order e Instrument model Fluke 123 12 digit instrument code 9444 and serial number DM The items are printed on the type plate on the bottom cover e Ordering code e tem number Reference designator e Description e Quantity 8 3 123 Service Manual 8 3 Final Assembly Parts See Table 8 1 and Figure 8 1 for the Final Assembly parts Table 8 1 Final Assembly Parts top case assembly Fluke 123 5322 442 00272 shielding foil 5322 466 11434 dust seal 5322 466 11435 conductive foam strip 5322 466 11436 display shielding bracket 5322 402 10204 display assembly 5322 135 00029 keypad 5322 410 10397 keypad foil 5322 276 13711 2 3 4 5 6 7 8 9 keyboard pressure plate 5322 466 10963 o combiscrew M3x10 5322 502 21507 bottom case 5322 442 00273 ek N combiscrew M3x10 5322 502 21507 Co battery pack BP120 battery door 5322 443 10237 a
154. ment data and instrument settings are stored in RAM D475 All RAM data will be lost if all power sources battery and power adapter are removed mask ROM The D ASIC has on chip mask ROM If no valid Flash ROM software is present when the test tool is turned on the mask ROM software will become activate The test tool can be forced to stay in the mask ROM software by pressing the and gt key and then turning the test tool on When active the mask ROM software generates a 100 kHz square wave on pin 59 of the D ASIC Display Control The LCD unit includes the LCD the LCD drivers and the fluorescent back light lamp It is connected to the main board via connector X453 The LCD is built up of 240 columns of 240 pixels each 240x240 matrix The D ASIC supplies the data and control signals for the LCD drivers on the LCD unit Figure 3 13 3 27 123 Service Manual 3 28 FRAME X81 160 X161 240 TOP FRONTVIEW LCD LCDATO 3 DATACLKO LINECLK PIXEL 0 0 Figure 3 13 LCD Control Each 14 ms the LCD picture is refreshed during a frame The frame pulse FRAME indicates that the concurrent LINECLK pulse is for the first column The column drivers must have been filled with data for the first column Data nibbles 4 bit are supplied via lines LCDATO LCDAT3 During 20 data clock pulses DATACLKO the driver for Y161 240 is filled When it is full it generates a carry to enable the driver above it which is f
155. n 4 5 10 Input A and B AC Voltage Accuracy Test Warning Dangerous voltages will be present on the calibration source and connecting cables during the following steps Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool Proceed as follows to test the Input A and B AC Voltage accuracy 1 Connect the test tool to the 5500A as for the previous test see Figure 4 5 123 Service Manual 2 Select the following test tool setup e Press to select auto ranging AUTO in top of display Do not press j anymore e Press le to open the INPUT A MEASUREMENTS menu and choose MEASURE on A W VAC e Press view to open the INPUT B MEASUREMENTS menu and choose INPUT B M ON MEASURE on B W VAC e Move the Input A and Input B ground level indicated by zero icon Ml to the center grid line Proceed as follows Press to enable the arrow keys for moving the Input A ground level Press to enable the arrow keys for moving the Input B ground level Using the G amp keys move the ground level 3 Using Gj set the Input A and B sensitivity to the first test point in Table 4 3 The corresponding range is shown in the second column of the table 4 Set the 5500A to source the required AC voltage NORMAL output WAVE sine Observe the Input A and Input B main reading and check to see if it is within the range shown under the appropriate column 6 Continue through the te
156. nce Verification Procedure 4 26 Chapter 5 Calibration Adjustment Title Page 5 Generalis tede Rr adh D eee s 5 3 5 1 1 Introduction s 5 oot te ti 5 3 5 1 2 Calibration number and dat sss 5 3 5 1 3 General Instructions eene ener 5 3 5 2 Equipment Required For Calibration eee 5 4 5 3 Starting Calibration Adjustment sse 5 4 5 4 Contrast Calibration Adjustment sse 5 6 5 5 Warming Up amp Pre Calibration sees eee eee e 5 7 5 6 Final Calibration eer neee e i EE EEEE e EEEE EERE EE o ekee 5 7 5 6 1 HF Gain Input A amp B rnei ar yiia nennen 5 7 5 6 2 Delta T Gain Trigger Delay Time amp Pulse Adjust Input A 5 9 5 6 3 Pulse Adjust Input A firmware V01 00 only eee 5 10 5 6 4 Pulse Adjust Input Bis ertet e Pe eite nere 5 11 5 6 5 Gain DMM Gain Volt esses 5 11 OO Volt Zero deceret eer eet eoe ed 5 13 5 6 7 Zero Ohm firmware V01 00 onl sese 5 13 5 6 8 Odin OD iac e eee rot reped ARES ETS eerie eps Me 5 14 5 6 9 Capacitance Gain Low and High eee 5 15 5 6 10 Capacitance Clamp amp Zero sse 5 15 5 6 11 Capacitance Gam 5i onse ii 5 16 5 7 Save Calibration Data and Exit ne eene 5 16 Calibration Adjustment 5 1 General 5 1 General 5 1 1 Introduction The following information provides the complete Calibration Adjustment procedure for the Fluke 123 test tool The test tool allows closed case c
157. ng square wave SCOPE output MODE edge rise time lt 1 ns aberrations lt 2 pp Set the 5500A to operate OPR Press E to start the calibration Wait until the display shows Pulse Adj B CL 0660 READY When you are finished set the 5500A to Standby RAE GA A Continue at Section 5 6 5 5 6 5 Gain DMM Gain Volt Warning Dangerous voltages will be present on the calibration source and connection cables during the following steps Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool Proceed as follows to do the Gain DMM calibration 1 Press to select the first calibration step in Table 5 3 2 Connect the test tool to the 5500A as shown in Figure 5 6 123 Service Manual FLUKE 5500A CALIBRATOR BB120 PM9081 PM9093 PM9091 001 1 5m PM9092 001 0 5m ST8001 CGM Figure 5 6 Volt Gain Calibration Input Connections 300V Set the 5500A to supply a DC voltage to the first calibration point in Table 5 3 Set the 5500A to operate OPR Press E to start the calibration Wait until the display shows calibration status READY Z SES Qe ee so Press to select the next calibration step set the 5500A to the next calibration point and start the calibration Continue through all calibration points of Table 5 3 8 Setthe 5500A to Standby and continue with step 9 Table 5 3 Volt Gain Calibration Points lt 300V Cal step Input va
158. ning Continue at step 3 Check TP486 RP for gt 3V If a power adapter voltage gt 19V is supplied TP486 is 12V If not correct then check TP487 for 3 3V generated by D471 and check V481 Load new software to see if the loaded software is corrupted See Section 7 6 Do the RAM test see Section 7 5 12 Check for bad soldered address data lines and IC pins Replace FLASH ROM D474 and RAM D475 7 4 3 Software Runs Test Tool not Operative 1 2 3 Check the Display and Backlight function see Section 7 5 1 Check the Fly Back Converter see Section 7 5 2 Check the Keyboard function see Section 7 5 3 7 7 123 Service Manual 7 5 Miscellaneous Functions 7 5 1 Display and Back Light h Warning The voltage for the LCD back light fluorescent lamp is gt 400V 1 Connect another LCD unit to see if the problem is caused by the LCD unit The unit is not repairable 2 Defective display Check the LCD control signals on measure spots MS401 MS422 near to X453 Use a 10 1 probe with ground lead on the probe connected to the metal screening of the UUT Notice that MS407 is missing a MS422 LCDONOFF for 3 3V b MS420 DATACLKO for 120 ns pulses MS414 415 LCDATO 1 for 250 ns pulses MS417 418 LCDAT2 3 for 250 ns pulses MS412 LINECLK for 120 ns pulses 16 kHz MS411 FRAME for 250 ns pules 66Hz MS409 M for a 625Hz square wave c MS406 5VA for 5V MS405 3V3D for 3 3V MS401 30VD for 30V from Fly B
159. nput A and Input B Tests An200MVUA 20usA PAL310 BMP NTSC262 BMP Figure 4 11 Test Tool Screen for PAL SECAM Figure 4 12 Test Tool Screen for NTSC line line 310 262 7 Apply the inverted TV Signal Generator signal to the test tool You can invert the signal by using a Banana Plug to BNC adapter Fluke PM9081 001 and a Banana Jack to BNC adapters Fluke PM9082 001 as shown in Figure 4 13 TV SIGNAL GENERATOR SIGNAL RED PM9081 COM COM BLACK BLACK SIGNAL g0 vD sT8142 ST8142 CGM Figure 4 13 Test Tool Input A to TV Signal Generator Inverted 8 Select the following test tool setup e Press to open the SCOPE INPUTS menu e Press to open the TRIGGER menu and choose E VIDEO on A The VIDEO TRIGGER sub menu is shown now From the VIDEO TRIGGER menu choose 4 25 123 Service Manual SYSTEM Bl NTSC or M PAL or M SECAM or Bl PALplus LINE M SELECT e POLARITY lB NEGATIVE s Using 53 UN set the Input A sensitivity to 200 mV div e Using GEESS select 20 us div 9 Using DU select the line number 310 for PAL or SECAM 262 for NTSC 10 Observe the trace and check to see if the test tool triggers on line number 311 for PAL or SECAM see Figure 4 14 line number 262 for NTSC see Figure 4 15 E mj VIDEO PAL3101 BMP NTSC2621 BMP Figure 4 14 Test Tool Screen for PAL SECAM Figure 4 15 Test Tool Screen for NTSC line line 310 Negative Video 262 Negative Video This is the end of the Performa
160. o enable the arrow keys for Trigger Level and Slope adjustment Using 30 select negative slope triggering L Using DC set the trigger level to 2 divisions from the screen center For negative slope triggering the trigger level is the bottom of the trigger icon L Set the 5500A to source 3V DC Verify that no trace is shown on the test tool display and that the status line at the display bottom shows Wait B L If the display shows the traces and status Hold B L then press to re arm the test tool for a trigger Decrease the 5500A voltage in 0 1V steps using the 5500A EDIT FIELD function until the test tool is triggered and the traces are shown Verify that the 5500A voltage is between 1 5V and 2 5V when the test tool is triggered To repeat the test start at step 28 When you are finished set the 5500A to Standby 4 13 123 Service Manual 4 14 4 5 9 Input A and B DC Voltage Accuracy Test WARNING Dangerous voltages will be present on the calibration source and connecting cables during the following steps Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool Proceed as follows 1 2 Connect the test tool to the 5500A as for the previous test see Figure 4 5 Select the following test tool setup e Press select auto ranging AUTO in top of display e Press 9 to open the INPUT A MEASUREMENTS menu and choose MEASURE on A
161. oceed as follows to do the Capacitance Clamp Voltage amp Zero calibration l 2 3 Press to select calibration adjustment step Cap Clamp CL 0940 IDLE Remove any input connection from the test tool open inputs Press to start the calibration The capacitance measurement clamp voltage Cap Clamp CL 0940 and the zero of the capacitance ranges Cap Zero CL 0950 Cap Zero CL 0953 will be calibrated now Firmware version V01 00 has an additional step Cap Zero CL 0954 Wait until the display shows Cap Zero CL 0953 READY For firmware V01 00 wait until the display shows Cap Zero CL 0954 READY Continue at Section 5 6 11 5 15 123 Service Manual 5 6 11 Capacitance Gain Proceed as follows to do the Capacitance Gain calibration Press E to select calibration adjustment step Cap Gain CL 0960 IDLE Connect the test tool to the 5500A as shown in Figure 5 9 Section 5 6 9 Set the 5500A to 500 nF Set the 5500A to operate OPR Press E to start the calibration Wait until the display shows Cap Gain CL 0960 READY Bole PON oho E Continue at Section 5 7 to save the calibration data 5 7 Save Calibration Data and Exit Proceed as follows to save the calibration data and to exit the Maintenance mode 1 Remove all test leads from the test tool inputs Do NOT turn off the test tool Steps 2 and 3 are required for serial numbers below DM7000000 only 2 Remove the PM8907 power adapter supply from the t
162. ode time base faster than 1 us div a trace is built up from several acquisition cycles During each acquisition a number of trace samples are placed as pixels in the LCD The RANDOMIZE circuit takes care that the starting moment of each acquisition cycle trigger release signal HOLDOFF goes low is random This prevents that at each next acquisition the trace is sampled at the same time positions and that the displayed trace misses samples at some places on the LCD The D ASIC supplies control data and display data to the LCD module The LCD module is connected to the main board via connector X453 It consists of the LCD LCD 123 Service Manual drivers and a fluorescent back light lamp As the module is not repairable no detailed description and diagrams are provided The back light supply voltage is generated by the back light converter on the POWER part The keys of the keyboard are arranged in a matrix The D ASIC drives the rows and scans the matrix The contact pads on the keyboard foil are connected to the main board via connector X452 The ON OFF key is not included in the matrix but is sensed by a logic circuit in the D ASIC that is active even when the test tool is turned off Via the PROBE A and PROBE B lines connected to the Input A and Input B banana shielding the D ASIC can detect if a probe is connected This function is not supported by the Fluke 123 software The D ASIC sends commands to the C ASICs and T ASIC via th
163. oes not properly function Notice that the acknowledge overwites the first character of the message sent to the test tool 7 5 13 Power ON OFF 1 Check TP528 for 3V at power on and OV at power off supplied by D471 If not correct do the Section 7 4 1 tests first 2 Check MS444 ONKEY D471 for 3V when pressing the ON key the signal must below for 100 150 ms Corrective Maintenance T 7 6 Loading Software 7 5 14 PWM Circuit 1 Check the PWM control signals generated by D471 The signals must show 0 3V pulses with variable duty cycle and a frequency of 100 25 or 6 kHz a CHARCURD CONTR D 100 kHz b SADCLEV POS A D BACKBRIG POS B D TRIGLEV2D TRIGLEV1D HO RNDM 25 kHz c OFFSETA D OFFSETB D 6 kHz 2 If not correct check a TP306 REFPWM2 for 3 3V used for CHARCURD SADCLEV b TP304 REFPWM1 for 3 3V used for other PWM signals If TP306 and TP304 are correct D471 may be defective 7 5 15 Randomize Circuit 1 Check TP483 for 0 3V pulses 25 kHz variable duty cycle 2 Check TP482 for 3 0V pulses variable frequency and duty cycle 7 6 Loading Software To load instrument software in the test tool the Fluke 43 123 19x ScopeMeter Loader program is required Power the test tool via the power adapter input using the BC190 Power Adapter Some units having serial numbers below DM7000000 can give the error message Error 8 No connection possible with UHM because they require a 20V
164. on the basis of the circuit diagrams shown in Figures 9 1 to 9 5 For all measurements input signals are applied to the shielded input banana jackets Traces and readings are derived from the same input signal samples So readings are related to the displayed readings 3 2 Block Diagram In the overall block diagram Figure 3 1 the test tool is divided in five main blocks Each block represents a functional part build up around an Application Specific Integrated Circuit ASIC A detailed circuit diagram of each block is shown in Section 9 See Table 3 1 for an overview of the blocks in which the test tool is broken down the main block function the ASIC name and the applicable circuit diagram Table 3 1 Fluke 123 Main Blocks ASIC Circuit Diagram CHANNEL A Input A signal V Q F conditioning C hannel ASIC OQ0258 Figure 9 1 CHANNEL B Input B signal V conditioning C hannel ASIC OQ0258 Figure 9 2 TRIGGER Trigger selection and conditioning T rigger ASIC OQ0257 Figure 9 3 Current source for resistance capacitance continuity and diode measurements AC DC input coupling and Q F relay control Voltage reference source DIGITAL Analog to Digital Conversion D igital ASIC MOT0002 Figure 9 4 Acquisition of ADC samples Micro controller uP ROM RAM Keyboard and LCD control POWER Power supply battery charger P ower ASIC OQ0256 Figure 9 5 LCD back light voltage converter Optical interface input All circuits except th
165. ontinue at 7 3 Charger Circuit 3 The test tool operates neither with the battery pack nor with the power adapter continue at 7 4 Starting with a Dead Test Tool 4 Particular functions are not correct continue at 7 5 Miscellaneous Functions Table 7 1 Starting Fault Finding NOT OK Battery pack connector sense resistors NOT OK See Section 7 3 Charger Circuit NOT OK NOT OK See Section 7 4 Starting with a Dead Test Tool Partly OK Partly OK See Section 7 5 Miscellaneous Functions 7 3 Charger Circuit 1 Power the test tool by the power adapter only 2 Check TP501 for 15 20V If not correct check the power adapter input circuit X501 Z501 V501 C501 3 Check TP504 VBAT for about 7 5V If not correct check R501 V504 V503 L501 C503 Check TP502 for a 100 kHz 13Vpp pulse signal if correct or low check if TP504 is shorted to ground and check V506 4 Install a charged battery The voltage at TP504 will be now about 5V 5 Check N501 pin 18 P7VCHA for z7V If not correct check N501 pin 20 for z15V supplied via R502 If 15V on pin 20 is correct check C507 replace N501 P7VCHA is the supply voltage for the charger control circuit in N501 It is derived from VADAPTER pin20 by an internal linear supply in N501 6 Check N501 pin 12 NETVALID for 2 7V and TP529 MAINVAL for 3 3V The NETVALID and MAINVAL signals indicate to the P ASIC and the D ASIC that a correct power adapter voltage is connec
166. ot Run sss esse 7 7 7 4 3 Software Runs Test Tool not Operanv sese eee eee eee 7 7 7 5 Miscellaneous Functions nrerin erein i i i E 7 8 7 5 1 Display and Back Light 7 8 TS Dy Back Converter TTT 7 9 AA A TTT 7 10 135 4 Keyboard i eer eR ER e ere ee tt 7 11 7 5 5 Optical Port Serial RS232 Interface sese 7 11 7 5 6 Channel A Channel B Voltage Measurements sese 7 11 7 5 7 Channel A Ohms and Capacitance Measurements sees ee eee eee 7 13 1 5 8 Trigger PUN CUONS aere reete ith ne P iere eene 7 14 7 5 9 Reference Voltages it Pe eret pea eed 7 15 TS TO Buzzet Circuit tte eee teet lt ete ees 7 15 7 5 11 Reset ROM Circuit PCB version lt 8 nV 7 15 rE R D WM CR 7 16 TIT Powe ON OFF rias 7 16 TO E D DECI AN AAA A tas 7 17 15 15 Randomize Circuit in dis 7 17 7 6 Eoading SO WAS 4 Lutte eive dida AE exact ve eet k 7 17 Corrective Maintenance T 7 1 Introduction 7 1 Introduction This chapter describes troubleshooting procedures that can be used to isolate problems with the test tool A Warning Opening the case may expose hazardous voltages For example the voltage for the LCD back light fluorescent lamp is gt 400V Always disconnect the test tool from all voltage sources and remove the batteries before opening the case If repair of the disassembled test tool under voltage is required it shall be carried out only by qualified personnel using customary precautions against electric shock If
167. otate the bail firmly sideways 6 2 4 Opening the Test Tool Referring to Figure 6 1 use the following procedure to open the test tool 1 Remove the battery pack see Section 6 2 2 2 Unscrew the four M3 Torx screws item 12 that secure the bottom case to the top case 3 Hold the test tool upside down and lift off the bottom case 6 3 123 Service Manual ST8014 EPS Figure 6 1 Fluke 123 Main Assembly 6 4 Disassembling the Test Tool 6 2 Disassembling Procedures 6 2 5 Removing the Main PCA Unit Referring to Figure 6 1 use the following procedure to remove the main PCA unit 1 Open the test tool see Section 6 2 4 2 Disconnect the LCD flex cable and the keypad foil flat cable see Figure 6 2 Unlock the cables by lifting the connector latch The latch remains attached to the connector body The keypad foil is provided with a shielding flap that covers the LCD flat cable The end of the flap is put under the main PCA unit shielding plate and can be easily pulled out Caution To avoid contaminating the flex cable contacts with oil from your fingers do not touch the contacts or wear gloves Contaminated contacts may not cause immediate instrument failure in controlled environments Failures typically show up when contaminated units are operated in humid areas 3 Unplug the backlight cable Warning If the battery pack or the power adapter is connect
168. otect the current source from being damaged by a voltage applied to the input a PTC resistor R172 and a protection circuit are provided See Section 3 3 3 Current Source During measuring input voltage measurements gain measurements and zero measurements are done As a result the voltage supplied to the ADC is a multiplexed zero reference reference input voltage signal Capacitance Measurements Channel A The capacitance measurement is based on the equation C x dV I x dt The unknown capacitor Cx is charged with a constant known current The voltage across Cx increases Circuit Descriptions 3 3 3 Detailed Circuit Descriptions and the time lapse between two different known threshold crossings is measured Thus dV I and dt are known and the capacitance can be calculated The unknown capacitance Cx is connected to the red Input A safety banana socket and the black COM input The T ASIC supplies a constant current to Cx via relay contacts K173 and protection PTC resistor R172 The voltage on Cx is supplied to two comparators in the C ASIC via the LF input The threshold levels th and th of the comparators are fixed see Figure 3 9 The time lapse between the first and the second threshold crossing depends on the value of Cx The resulting pulse is supplied to the TRIGGER output pin 29 which is connected to the analog trigger input of the T ASIC TRIG A signal The T ASIC adjusts the pulse to an appropriate level and sup
169. ow 12 When you are finished set the 5500A to Standby 4 5 8 Input A and B Trigger Level and Trigger Slope Test Proceed as follows 1 Connect the test tool to the 5500A as shown in Figure 4 5 FLUKE 5500A CALIBRATOR BB120 ee xs o PM9081 PM9093 PM9091 001 1 5m PM9092 001 0 5m ST8001 CGM Figure 4 5 Test Tool Input A B to 5500A Normal Output 2 Select the following test tool setup e Turn Input B on if not already on s Using 3 E change the sensitivity to select manual sensitivity ranging and lock the Input A and Input B sensitivity on 1 V div 123 Service Manual 4 12 10 11 12 13 14 e Move the Input A and Input B ground level indicated by zero icon JM to the center grid line Proceed as follows Press to enable the arrow keys for moving the Input A ground level Press to enable the arrow keys for moving the Input B ground level Using the G keys move the ground level e Using change the time base to select manual time base ranging and lock the time base on 10 ms div e Press to open the SCOPE INPUTS menu e Press to open the TRIGGER menu and choose INPUT M A SCREEN UPDATE M FREE RUN AUTO RANGE W gt 15HZ e Press to enable the arrow keys for Trigger Level and Slope adjustment e Using 06 select positive slope triggering trigger icon J e Using DO set the trigger level to 2 divisions from the screen center For positive slope triggering the tri
170. plies it to the D ASIC via its ALLTRIG output The pulse width is measured and processed by the D ASIC and represented on the LCD as numerical reading There will be no trace displayed pos clamp active th2 l l neg clamp active i neg clamp active TRIG A Figure 3 9 Capacitance Measurement The T ASIC supplies a positive charge and a negative discharge current A measurement cycle starts from a discharged situation U cx 0 with a charge current After reaching the first threshold level th the pulse width measurement is started The dead zone between start of charge and start of pulse width measurement avoids measurement errors due to a series resistance of Cx The pulse width measurement is stopped after crossing the second threshold level th the completes the first part of the cycle Unlimited increase of the capacitor voltage is avoided by the positive clamp in the T ASIC The output of the high impedance buffer in the C ASIC supplies a replica of the voltage across Cx to output pin 23 ADDRESS Via R165 this voltage is supplied to a clamp circuit in the T ASIC SENSE pin 59 This clamp circuit limits the positive voltage on Cx to 0 45V Now the second part of the measurement is started by reversing the charge current The capacitor will be discharged in the same way as the charge cycle The time between passing both threshold levels is measured again A clamp limits the minimum voltage
171. quired charge current information is supplied by the D ASIC via the CHARCUR Circuit Descriptions 3 3 3 Detailed Circuit Descriptions line and filter R534 C534 to pin 80 A control loop in the control circuit adjusts the actual charge current to the required value The filtered CHARCUR voltage range on pin 80 is 0 2 7V for a charge current from 0 5A to zero A voltage of 0V complies to 0 5A fast charge 1 5V to 0 2A top off charge 2 3V to 0 06A trickle charge and 2 7V to 0A no charge If the voltage is gt 3 Volt the charger converter is off V506 permanently non conductive The D ASIC derives the required charge current value from the battery voltage VBAT The P ASIC converts this voltage to an appropriate level and supplies it to output pin 78 BATVOLT The D ASIC measures this voltage via the Slow ADC The momentary value and the voltage change as a function of time dV dt are used as control parameters Charging process If the battery voltage drops below 5 2V and the battery temperature is between 10 and 45 C the charge current is set to 0 5A fast charge From the battery voltage change dV dt the D ASIC can see when the battery is fully charged and stop fast charge Additionally a timer in the D ASIC limits the fast charge time to 6 hours After fast charge a 0 2A top off charge current is supplied for 2 hours Then a 0 06A trickle charge current is applied for 48 hours maximum If the battery temperature become
172. r moment and the moment of the first sample after the trigger This pulse width information is required in random repetitive sampling mode see below The HOLDOFF signal supplied by the D ASIC releases the trigger system The sample clock SMPCLK also provided by the D ASIC is used for synchronization Real time sampling TRIGDT signal For time base settings of 1 us div and slower the pixel distance on the LCD is 240 ns 1 division is 25 pixels As the maximum sample rate is 25 MHz a sample is taken each 40 ns So the first sample after a trigger can be assigned to the first pixel and successive samples to each next pixel So a trace can be built up from a single period of the input signal Random repetitive equivalent sampling TRIGDT signal For time base settings below 1 us div the time between two successive pixels on the screen is smaller than the time between two successive samples For example at 20 ns div the time between two pixels 1s 20 25 0 8 ns and the sample distance is 40 ns sample rate 25 MHz A number of sweeps must be taken to reconstruct the original signal see Figure 3 11 As the samples are taken randomly with respect to the trigger moment the time dt must be known to position the samples on the correct LCD pixel The TRIGDT signal is a measure for the time between the trigger and the sample moment dt The pulse duration of the TRIGDT signal is approximately 4 us 20 us 3 13
173. rformance Verification 4 4 5 Input A and Input B Tests 5 Using set the time base to 10 ms div 6 Using EM EN toggle the sensitivity of Input A between 5 and 10 mV div After changing the sensitivity wait some seconds until the trace has settled Observe the Input A trace and check to see if it is set to the same position after changing the sensitivity The allowed difference is 0 04 division 1 pixel 7 Using Gj EN toggle the sensitivity of Input B between 5 and 10 mV div After changing the sensitivity wait some seconds until the trace has settled Observe the Input B trace and check to see if it is set to the same position after changing the sensitivity The allowed difference is 0 04 division 1 pixel 8 When you are finished remove the Input A and Input B short 4 5 2 Input A Trigger Sensitivity Test Proceed as follows to test the Input A trigger sensitivity 1 Connect the test tool to the 5500A as shown in Figure 4 3 FLUKE 5500A CALIBRATOR ST8004 CGM Figure 4 3 Test Tool Input A to 5500A Scope Output 500 2 Select the following test tool setup e Press to select auto ranging AUTO in top of display Do not press anymore s Using A US change the sensitivity to select manual sensitivity ranging and lock the Input A sensitivity on 200 mV div 3 Set the 5500A to source a 5 MHz leveled sine wave of 100 mV peak to peak SCOPE output MODE levsin 4 Adjust the amplitude of the sine w
174. rious circuits The T ASIC also controls the Channel A and B AC DC input coupling relays and the O F relays Control data for the T ASIC are provided by the D ASIC via the SDAT and SCLK serial communication lines 3 2 3 Digital Circuit The D ASIC includes a micro processor ADC sample acquisition logic trigger processing logic display and keyboard control logic I O ports and various other logic circuits The instrument software is stored in the FlashROM the RAM is used for temporary data storage The RESET ROM circuit controls the operating mode of the FlashROM reset programmable operational For Voltage and Resistance measurements the conditioned Input A Input B voltages are supplied to the ADC A and ADC B ADC The voltages are sampled and digitized by the ADC s The output data of the ADC s are acquired and processed by the D ASIC For capacitance measurements the ALLTRIG signal generated by the T ASIC is used The D ASIC counts the ALLTRIG signal pulse width which is proportional to the unknown capacitance The DPWM BUS Digital Pulse Width Modulation supplies square wave signals with a variable duty cycle to the PWM FILTERS circuit RC filters The outgoing APWM BUS Analog PWM provides analog signals of which the amplitude is controlled by the D ASIC These voltages are used to control e g the trace positions C ASIC the trigger levels T ASIC and the battery charge current P ASIC In random sampling m
175. rol voltage is increased during building up a screen image A FRAME pulse starts the new screen image The FRAME pulse is also used to discharge C404 After the FRAME pulse the voltage on C404 increases during building up a sreen image Keyboard Control ON OFF Control Circuit Descriptions 3 3 3 Detailed Circuit Descriptions The keys are arranged in a 6 rows x 6 columns matrix If a key is pressed the D ASIC drives the rows and senses the columns The ON OFF key is not included in the matrix This key toggles a flip flop in the D ASIC via the ONKEY line D ASIC pin 72 As the D ASIC is permanently powered the flip flop can signal the test tool on off status PWM Signals The D ASIC generates various pulse signals by switching a reference voltage REFPWMI or REFPWM2 with software controllable duty cycle PWMA PWMB pins 26 40 By filtering the pulses in low pass filters RC software controlled DC voltages are generated The voltages are used for various control purposes as shown in Table 3 6 Table 3 6 D ASIC PWM Signals Pega raton nemen seen HO RNDM HOLDOFF randomize control R487 of RANDOMIZE circuit REFPWM1 TRGLEV1D Trigger level control T ASIC REFPWM1 TUM POS AD POS BD AD POS BD Channel A B Channel A B position control control ICASIO 0000000000 ASIC REFPWM1 OFFSETAD Channel A B offset control C ASIC REFPWM1 OFFSETBD 3 29 123 Service Manual 3 30 SDA SCL Serial Bus The unidirec
176. round loose Corrective Maintenance 7 4 Starting with a Dead Test Tool pins of N501 or N501 defective Check the VD supply voltage on D ASIC D471 Temporarily remove R470 to check for short circuit Check N501 pin 64 VGARVAL for 3 3V If not correct a Check if the line is shorted to ground b Check N501 pin 73 REFPWM2 for 3V3 REFPWM2 is supplied by N501 and derived from REFP on the reference circuit on the Trigger part Check TP307 N501 pin 72 REFP for 1 22V check V301 R307 Ifno 1 22V and V301 R307 and connections are correct then replace N501 c Check N501 pin 12 NETVALID for 2 6V If not correct proceed as indicated in Section 7 3 step 6 d Check the Power ON OFF function see Section 7 5 13 Check X tal signals on TP473 32 kHz and TP476 25 MHz if not correct check connections replace X tals replace D471 The 16 MHz clock on TP474 runs only if the test tool software runs If the 16 MHz clock is present then continue at Section7 4 3 7 4 2 Test Tool Software Does not Run pbocge Se ES Turn the test tool OFF and ON again Check D471 pin 59 row1 for a 100 kHz square wave If no 100 kHz is not present but you heard a weak beep the test tool software runs but the buzzer circuit does not function correctly Go to Section 7 5 10 to check the buzzer circuit then continue at Section 7 4 3 to see why the test tool cannot be operated Ifa 100 kHz square wave is present the MASK software is run
177. rous voltages will be present on the calibration source and connecting cables during the following steps Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool Proceed as follows to test the Volts Peak measurement function 1 2 Connect the test tool to the 5500A as for the previous test see Figure 4 5 Select the following test tool setup e Press to open the SCOPE INPUTS menu e Press to open the TRIGGER menu and choose INPUT A SCREEN UPDATE M FREE RUN AUTO RANGE W gt 15HZ e Press to select auto ranging AUTO in top of display e Press es to open the INPUT A MEASUREMENTS menu and choose MEASURE on A M PEAK From the INPUT A PEAK sub menu choose PEAK TYPE M PEAK PEAK e Press YA to open the INPUT B MEASUREMENTS menu and choose INPUT B M ON MEASURE on B M PEAK 123 Service Manual From the INPUT B PEAK sub menu choose PEAK TYPE BM PEAK PEAK e Using Gi EY select 1V div for input A and B 3 Set the 5500A to source a sine wave to the first test point in Table 4 5 NORMAL output WAVE sine 4 Observe the Input A and Input B main reading and check to see if it is within the range shown under the appropriate column Continue through the test points 6 When you are finished set the 5500A to Standby Table 4 5 Volts Peak Measurement Verification Points 5500A output Vrms sine 5500A Frequency Reading A B 1 768 5V peak
178. s higher than 50 C the charge current is set to zero Battery temperature monitoring The P ASIC supplies a current to a NTC resistor in the battery pack TEMP pin 5 It conditions the voltage on pin 5 and supplies it to output pin 79 BATTEMP The D ASIC measures this voltage via the slow ADC It uses the BATTEMP voltage to decide if fast charge is allowed 10 45 C or no charge is allowed at all lt 10 C gt 50 C Additionally the temperature is monitored by the P ASIC The P ASIC supplies a current to reference resistor R512 TEMPHI pin 4 and compares the resulting TEMPHI voltage to the voltage on pin 5 TEMP If the battery temperature is too high the P ASIC Control circuit will set the charge current to zero in case the D ASIC fails to do this If the battery temperature monitoring system fails a bimetal switch in the battery pack interrupts the battery current if the temperature becomes higher then 70 C Maximum VBAT The P ASIC supplies a current to reference resistor R513 VBATHIGH pin 7 It compares the voltage on R513 to the battery voltage VBAT on pin 3 after being attenuated in the P ASIC The P ASIC limits the voltage VBAT to 7 4V via its internal Control circuit This situation arises in case no battery or a defective battery open is present Charger Converter input current This input current is sensed by R501 The P ASIC supplies a reference current to R514 The P ASIC compares the voltage drop on R501 CH
179. se to the T ASIC TRIGQUAL Now the T ASIC derives the final trigger TRIGDT from the qualified trigger signal TRIGQUAL Capacitance measurements ALLTRIG As described in Section 3 3 2 capacitance measurements are based on measuring the capacitor charging time using a known current The ALLTRIG pulse signal represents the charging time The time is counted by the D ASIC Microprocessor The D ASIC includes a microprocessor with a 16 bit data bus The instrument software is loaded in a 8 Mb Flash ROM D474 Circuit Descriptions 3 3 3 Detailed Circuit Descriptions ROM control for PCB versions lt 8 The Flash ROM mode depends on the output signal of the RESET ROM circuit RP e RP gt 2V software can run True if 12V present and or ROMRST is high e RP lt 2V software cannot run True if 12V not present and or ROMRST is low test tool off e RP gt 12V software can run and ROM can be programmed True if 12V is present The 12VPROG voltage is derived from the power adapter input voltage by the P ASIC on the POWER part To program the ROM the power adapter voltage must be 20V 1V to ensure a correct 12V voltage level ROM control for PCB versions 8 and newer FlashROMs used on PCB version 8 and newer do not need the 12V programming voltage The circuit D480 and related parts create a delay for the ROMWRITE enable signal This prevents the ROM write proces being disabled before all data have been written RAM Measure
180. software firmware are identified by incrementing the software version number These changes are documented on a supplemental change errata sheet which when applicable is included with the manual To display the software version proceed as follows Press E to open the USER OPTIONS menu 2 Press to show the VERSION amp CALIBRATION screen see Figure 5 1 in Section 5 3 Press to return to normal mode 10 2 Hardware modifications Changes and improvements made to the test tool hardware are identified by incrementing the revision number of the Main PCA The revision number is printed on a sticker see the example below The sticker is placed on D ASIC D471 on the Main PCA This example of the Main PCA revision number sticker indicates revision 1 The following revisions have been released Revision 09 Revision number of first deliveries Revision 10 Changes Physical size of C511 and C512 changed Reason For production purposes Servicing effects none you can use the PN listed in Section 8 Revision 11 Changes C556 has been changed from 18 nF into 15 nF Reason For production purposes Servicing effects none you can use the PN listed in Section 8 10 1 123 Service Manual 10 2 Revision 12 Changes New software version V01 02 No hardware changes Revision 13 Changes For the 8M FlashROM D474 one of the following types can be used AM29LV800B 120EC E28F800CV B70 HNWT800T M5M29FB
181. st points When you are finished set the 5500A to Standby Table 4 3 Volts AC Measurement Verification Points Oscilloscope Meter Volts rms Frequency gt D The 500V and 1250V range will be tested in Section 4 5 14 4 5 11 Input A and B AC Input Coupling Test Proceed as follows to test the Input A and B AC coupled input lower transition point 1 Connect the test tool to the 5500A as for the previous test see Figure 4 5 2 Select the following test tool setup e Use the setup of the previous step AUTO time base traces at vertical center s Using 5 EN select 200 mV div for Input A and B 500 mV range Performance Verification 4 4 5 Input A and Input B Tests e Press to open the SCOPE INPUTS menu and choose INPUT A B AC B NORMAL INPUT B M AC NORMALI e Press to open the SCOPE INPUTS menu e Press to open the TRIGGER menu and choose INPUT A SCREEN UPDATE M FREE RUN AUTO RANGE B gt 1HZ Set the 5500A to source an AC voltage to the first test point in Table 4 4 NORMAL output WAVE sine Observe the Input A and Input B main reading and check to see if it is within the range shown under the appropriate column Continue through the test points When you are finished set the 5500A to Standby Table 4 4 Input A and B AC Input Coupling Verification Points 5500A output V rms 5500A Frequency Reading A B 500 0 mV 10 Hz 4 5 12 Input A and B Volts Peak Measurements Test WARNING Dange
182. surements 1 Press Ea and select MEASURE on A Bl OHMQ Connect a current meter between Input A and the COM input Select the various Ohms ranges and verify that the current approximately matches the values listed in the table below If not correct the protection circuit or the current source in the T ASIC N301 may be defective If the current is correct and the Volt function is correct so ADC is correct then the Ohms part in the C ASIC is defective replace N101 D 50 Q range for CONTINUITY only 7 13 123 Service Manual 2 Press BS and select MEASURE on A M CAP Verify TP156 for 3 3 OV pulses repetition rate 100 200 ms Zero scale open input pulse width approximately 30 us Full scale for example 500 nF pulse width approximately 25 ms If not correct most probably the C ASIC N101 is defective If correct continue at Section 7 5 8 Trigger functions pulse width is measured via the T ASIC 7 5 8 Trigger Functions 1 2 3 Press 0 and select MEASURE on A BE VDC Press and select INPUT A lil DC NORMAL INPUT B M DC NORMAL Press to select the SCOPE INPUTS menu Press j to select the TRIGGER menu and select INPUT MA or B SCREEN UPDATE M FREE RUN AUTO RANGE BB gt 15HZ Press to open the SCOPE INPUTS menu Press to open the SCOPE OPTIONS menu and select SCOPE MODE lB NORMAL WAVEFORM MODE M NORMAL Supply a 1 kHz sine wave of 3 divisions to Input A
183. ted The signals enable control of the P ASIC CHARGE circuit controls V506 by 100 kHz 13Vpp square wave If correct continue at step 7 Corrective Maintenance 7 3 Charger Circuit If not correct then a C Check TP571 3 V3GAR for 3 V3V If not correct possibly caused by V569 R580 TP571 short to ground loose pins of N501 N501 defective Check N501 pin 8 VADALOW for 1 1V If not correct 1 Check R516 and connections The P ASIC supplies a current to R516 The current source uses REFPWM2 and IREF see 2 and 3 below 2 Check N501 pin 73 REFPWM2 for 3 V3 REFPWM2 is supplied by the P ASIC Check TP307 N501 pin 72 REFP for 1 22V check V301 and R307 3 Check N501 pin 74 IREF for 1 61V If not correct possibly caused by R528 loose pin 74 or N501 defective Check 3V3SADC on N501 pin 65 for 3 3V 7 Check TP531 CHARCURR The CHARCURR signal controls the battery charge current If TP531 lt 2 7V continue at step 7a If TP531 gt 2 7V continue at step 7b a C Check if charger FET V506 is controlled by a 100 kHz 13 Vpp square wave on TP502 FET gate If correct check replace V506 If not correct check 1 N501 pin 4 TEMPHI relative to X503 pin 3 N501 pin 9 for 200 mV If not correct check R512 and connections 2 N501 pin 5 TEMP relative to X503 pin 3 N501 pin 9 for 400 500 mV at about 20 C If not correct check the NTC in the battery pack for 12 kQ at 20 C X
184. tery current 2 BATVOLT N501 pin 78 must be 0 67 x VBAT 3 27 Volt If not correct replace N501 Measure VBAT on TP504 N501 pin 3 VBAT senses battery the voltage 3 BATTEMP N501 pin 79 must be TEMP IBATP Volt If not correct replace N501 Measure TEMP on N501 pin 5 X503 pin 6 TEMP senses the battery temperature Measure IBATP on X503 pin 3 7 N501 pin 9 IBATP senses the battery current 4 3V3SADC must be 3 3V supplied by N501 pin 65 If not correct check if the 3V3SADC line is shorted to ground If it is not then replace N501 5 SELMUXn TP591 TP592 TP593 supplied by the D ASIC must show LF pulses OV to 3 3V 0 5 3 seconds period 6 Check TP536 TP537 and TP534 for signals shown below typical examples measured signals may have different pulse amplitude and repetition rate TP536 if at a fixed level replace D531 TP537 if not correct trace signal to PWM circuit on the Digital part TP534 if at a fixed level replace N531 mM o een E TP536 TP537 TP534 zt0 5V ov j 4 ae Nue V Augen 500 ms Corrective Maintenance T 7 5 Miscellaneous Functions 7 5 4 Keyboard Proceed as follows if one or more keys cannot be operated 1 Replace the key pad and the key pad foil to see if this cures the problem 2 Press a key and check ROWO 5 measure spots MS432 MS437 for the signal shown below estel 50 ms in us pulses Release key If no key is pressed
185. the ROW lines are low if a battery is installed if the 123 is powered by the the mains adapter only the lines are alternating pulsing and low 3 Check COLO 3 measure spots MS438 MS441 for a 3 3V level Then press and hold a key and check the matching COL line for the signal shown below Pessiey 80 ma ie us pulses If not correct check the connections from X452 to D471 replace D471 For the ON OFF key see Section 7 5 13 7 5 5 Optical Port Serial RS232 Interface Receive RXD 1 Check the voltage RXDA on TP522 for 200 mV and the voltage RXD on TP527 buffered and amplified RXDA voltage for 3 3V 2 Shine with a lamp in the optical port H522 Check the voltage RXDA on TP522 for 0 0 6V and the voltage RXD on TP527 for OV Send TXD 1 Check the voltage TXD on TP521 for 3 3V 2 Press E to open the SAVE amp PRINT menu 3 Press PRINT SCREEN to start the test tool data output Check the voltage TXD on TP521 for a burst of pulses pulses from 2V to 3 3V The length of the burst and the pulses depends on the selected baud rate 7 5 6 Channel A Channel B Voltage Measurements 1 Press to open the SCOPE INPUTS menu and select INPUT A BL DC B NORMAL INPUT B M DC M NORMAL 123 Service Manual 10 11 12 Press to open the SCOPE INPUTS menu Press to open the SCOPE OPTIONS menu and select SCOPE MODE M ROLL MODE WAVEFORM MODE M NORMAL Apply a 1 kHz square wave to Input A
186. the test tool fails first verify that you are operating it correctly by reviewing the operating instructions in the Users Manual When making measurements for fault finding you can use the black COM input banana jack or the metal shielding on the Main PCA unit as measurement ground To access the Main PCA for measurements proceed as follows 1 Remove the Main PCA unit see Section 6 2 5 Disassemble the Main PCA unit see Section 6 3 3 Connect the Display Assembly flat cable the Backlight cable and the Keypad Foil flex cable to the Main PCA unit Position the Keypad on the Keypad foil See Figure 7 1 The Test tool without the case is operative now 4 Power the PCA via the Power Adapter and or battery pack Watch out for short circuiting due to metal parts on your desk SCOPE MENU USER SAVE NZ OPTIONS PRINT REPAIR3 BMP Figure 7 1 Operative Test Tool without Case 7 3 123 Service Manual 7 2 Starting Fault Finding After each step continue with the next step unless stated otherwise Power the test tool by the battery pack only then by the power adapter only 1 The test tool operates with the power adapter but not with the battery only install a charged battery VBAT gt 4V and check the connections between the battery and the test tool X503 R504 R506 R507 2 The test tool operates with the battery pack but not with the power adapter only and the battery pack is not charged by the test tool c
187. tional SDA SCL serial bus pin 56 57 is used to send control data to the C ASIC s e g change attenuation factor and the T ASIC e g select other trigger source The SDA line transmits the data bursts the SCL line transmits the synchronization clock 1 25 MHz Probe Detection Via the probe detection inputs PROBE A and PROBE B pin 54 55 the D ASIC detects if the Input A and B probes have been connected disconnected The SUPPRDET signal pin 99 can suppress the probe detection If this signal is low The PROBE A and PROBE B lines are permanently low via R471 R472 regardless of a probe is connected or not connected This function is not supported by the Fluke 123 software See also Section 3 3 2 Probe detection TXD RXD Serial Interface Optical Port The optical interface output is directly connected to the TXD line pin 86 The optical input line is buffered by the P ASIC on the power part The buffered line is supplied to the RXD input pin 87 The serial data communication RS232 is controlled by the D ASIC Slow ADC Control SADC Bus The SELMUX0 2 pins 96 98 and SLOWADC pin 100 lines are used for measurements of various analog signals as described in Section 3 3 1 SLOW ADC BATIDENT The BATTIDENT line pin 90 is connected to R508 on the Power part and to a resistor in the battery pack Ifthe battery is removed this is signaled to the D ASIC BATTIDENT line goes high MAINVAL FREQPS T
188. tput signal is supplied to the synchronization pulse separator circuit This circuit consists of C395 V395 and related parts The output signal TVSYNC is the synchronization pulse at the appropriate voltage level and amplitude for the T ASIC analog trigger path Note External triggers provided by the Isolated Trigger Probe to the optical interface are processed directly by the D ASIC The TRIG A TRIG B or TVSYNC signal and two trigger level voltages TRIGLEV1 and TRIGLEV2 are supplied to the analog trigger part The trigger level voltages are supplied by the PWM section on the Digital part See Section 3 3 4 The TRIGLEV1 voltage is used for triggering on a negative slope of the Input A B voltage The TRIGLEV2 voltage is used for triggering on a positive slope of the Input A B voltage As the C ASIC inverts the Input A B voltage the TRIGA TRIGB slopes on the T ASIC input are inverted From the selected trigger source signal and the used trigger level voltages the ALLTRIG and the DUALTRIG trigger signal are derived The select logic selects which one will be used by the synchronization delta T circuit to generate the final trigger There are three possibilities 1 Single shot triggering The DUALTRIG signal is supplied to the synchronization delta T circuit The trigger levels TRIGLEV1 and TRIGLEV2 are set just above and below the DC level of the input signal A trigger is generated when the signal crosses the trigger levels A trigger wil
189. tputs 1 HFO 10 HF 1 100 HF2 or 1000 HF3 By attenuating the HF3 input internally by a factor 10 the C ASIC can also create a 10000 attenuation factor Inputs of not selected input buffers are internally shorted If required optional FETs V151 V153 can be installed They will provide an additional input buffer short for the not selected buffers to eliminate internal in the C ASIC cross talk To control the DC bias of the buffers inputs their output voltage is fed back via an internal feed back resistor and external resistors R115 R111 R120 R112 R113 and R114 The internal feed back resistor and filter R110 C105 will eliminate HF feed back to obtain a large HF gain The C ASIC includes a HF pre amplifier with switchable gain factors for the 1 2 5 steps The C ASIC also includes circuitry to adjust the gain and pulse response ADC output pin 27 The combined conditioned HF LF signal is supplied to the ADC output pin 27 via an internal ADC buffer The output voltage is 150 mV division The MIDADC signal pin 28 supplied by the ADC matches the middle of the C ASIC output voltage swing to the middle if the ADC input voltage swing TRIGGER output pin 29 The combined conditioned HF LF signal is also supplied to the trigger output pin 29 via an internal trigger buffer The output voltage is 100 mV div This signal TRIG A is supplied to the TRIGGER ASIC for triggering and time related measurements See 3 3 4 Triggerin
190. via transistor V569 3V3GAR If the voltage 3V3GAR is below 3 05V the P ASIC keeps its output signal VGARVAL supplied to the D ASIC low and the D ASIC will not start up The test tool is not working and is in the Idle mode If the voltage 3V3GAR is above 3 05V the P ASIC makes the line VGARVAL high and the D ASIC will start up The test tool is operative now If it is powered by batteries only and not turned on it is in the Off mode In this mode the D ASIC is active the real time clock runs and the ON OFF key is monitored to see if the test tool will be turned on If the power adapter is connected P ASIC output MAINVAL high and or the test tool is turned on the embedded D ASIC program called mask software starts up The mask software checks if valid instrument software is present in the Flash ROMs If not the test tool does not start up and the mask software continues running until the test tool is turned off or the power is removed This is called the Mask active mode The mask active mode can also be entered by pressing the and gt key when turning on the test tool If valid instrument software is present one of the following modes will become active Charge mode The Charge mode is entered when the test tool is powered by the power adapter and is turned off The FLY BACK CONVERTER is off The CHARGER CONVERTER charges the batteries if installed Operational amp Charge mode The Operational amp Charg
191. w the D ASIC is inactive the test tool is in the Idle mode A low VGARVAL line operates as a reset for the D ASIC If VGARVAL is high 3 V3GAR gt 3 05V the D ASIC becomes active and the Off mode is entered The D ASIC monitors the P ASIC output pin 12 MAINVAL and the test tool ON OFF status By pressing the ON OFF key a bit in the D ASIC indicating the test tool ON OFF status is toggled If neither a correct power adapter voltage is supplied MAINVAL is low or the test tool is turned on the Off mode will be maintained If a correct power adapter voltage is supplied MAINVAL high or if the test tool is turned on the mask software starts up The mask software checks if valid instrument software is present If not e g no instrument firmware is loaded the mask software will keep running and the test tool is not operative the test tool is in the Mask active state For test purposes the mask active mode can also be entered by pressing the and gt key when the test tool is turned on If valid software is present one of the three modes Operational Operational amp Charge or Charge will become active The Charger Converter circuit is active in the Operational amp Charge and in the Charge mode The Fly back converter is active in the Operational and in the Operational amp Charge mode Charger Converter See Also Figure 3 3 The power adapter powers the Charge Control circuit in the P ASIC via an internal linear regulator
192. we E 8 amp y 4 13 VADALOW Z 25 b ee E 203 R565 V565 V566 CHARCUR R534 CHARCURR 80 cHarcurR SEE 55 88 5 2 Bf TOOK BC848 C BC848 C Tpsog R513 ms 4 T lanne nnu E m ada x ai 62 gee 26K1 3K16 23k7 L C534 C553 100 I gt 150 T pea FE j TP526 T Z N o 5 z s i 4 8 FREQPS 4J13 eE w BRE ES So TP528 RSI H w ray uj E F1 miu X e I y C m PWRONOFF 14 318 TP527 RXD 14 313 EEE y ol ook R528 L cs29 TXD PEE U SLOW ADC 34K8 emdon r RiSUSNHGISUNIUTINIWUISSMI It LL LEAD K S Da di 4 BACKLIGHT CONVERTER L q MS453 4 114 NM ZZ L Lar use E 6 L600 ceos xeor 1 zu nal BAT 2 7 150u 33p E LLL SADC BUS L 3 8 Vela L m ik T HV OUTPUT Vaio MBRS340 T 47n la TO LCD MODULE TP591 TP592 TP593 m o D531 DEA J sapos T600 meis a 74HC4051 8 68 e E g MS454 SELMUXO so veo 116 10 SELMUX1 ler onal TP603 Can 75 NC 2 SELMUX2 2 s2 veel TP536 N531 TP534 N600 o DF3NO2 8 V605 V603 E a 1 LMC7101 3V3SADC 3 BOUT GND T Ts 3 Bcass C M BAS16 L Pa C603 AOUT PGND 2 poemon go zi A ll acts T m ie Rl a RU med Ls o a MEE gt l T 3 3 H L 0583 R529 R527 TP600 e i 1 COMP ENBL i T n 100n a 6 BATCUR 121 Y2 su 20 R532 F 100n 261K 147E ss vec BLC13 Y3 vo v TUVE lt lt ER M C606 5 1 D10 p DACTESTA 1 va TP522 TP521 R605 7 Nic REF 49 4008 E 2 010 p DACTESTB 51y5 IF N531 NE5230 a C604 y NE NIC g
193. y the test pattern as shown in Figure 4 1 may not be visible or hardly visible Observe the display closely and verify that no light pixels are shown Figure 4 1 Display Pixel Test Pattern 11 Press i The test pattern is removed the test tool shows Contrast CL 0110 MANUAL Performance Verification 4 4 5 Input A and Input B Tests 12 Press E CAL The test tool shows the display test pattern shown in Figure 4 1 at default contrast Observe the test pattern closely and verify that the no pixels with abnormal contrast are present in the display pattern squares Also verify that the contrast of the upper left and upper right square of the test pattern are equal 13 Press The test pattern is removed the test tool shows Contrast CL 0120 MANUAL 14 Press E CAL The test tool shows a light display the test pattern as shown in Figure 4 1 may not be visible or hardly visible Observe the display closely and verify that no dark pixels are shown 15 Turn the test tool OFF and ON to exit the calibration menu and to return to the normal operating mode 4 5 Input A and Input B Tests Before performing the Input A and Input B tests the test tool must be set in a defined state by performing a RESET Proceed as follows to reset the test tool e Press Koj to turn the test tool off e Press and hold ES e Press and release Koj to turn the test tool on Wait until the test tool has beeped twice and then release ES

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