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668x SERVICE MANUAL

1. 251m 6219 6 SH og TN U 3 k is 8213 5 9018 Q zi Sota TOL in in 9 2 eT Teta z T m Y J S tv x A3 Coop 8213 Sty 1113 5 2 o 0 x 5 beta KARNE Tela IX Y 3 E 2012 x 5 86102 n c 2 o gt m o m 0 o 2 gt US a TESTA a lo 5 5 D aan hie l Iz
2. CU gt STATUS 150 FROM 4 COMPARATORS R663 CUPROG R670 om 52 VA C631 NO SOLDER SZD657 1 MASK RELIEF 45 05 UCU REF PWM gt CU ERROR REF_PWM AMP su L R681 R682 VV AAA 19K 05 4K 1 bites 1710W 2200PF 5255 D670 C636 panat a HEY 3 Se 05x 5 r a r 30K 1 ibo Ti 0689 1710W 150 5 al Q621 C656 V 1000 D R741 UCU amp APROG_DIS 222 NNV p 1 82K R706 R704 OR GATE 0 10M 5 CC COMPENSATION FOR INDUCTANCE R205 x 1741 6800PF OR_GATE lt C648 0560 R668 R669 C648 0 0 4 99K 75K Ease pate 59 150 N J 100U C214 509 R701 15V MN UCU 10K 1 L _ R713 1000 111 gis R712 UF SEN 10K R743 T A 5 40K 1 rt 150 LF Y 48 4 R693 Im n p650 46 21 5 7022 I C710 R697 R698 1009 sp 1K 14 100 1 R689 690 R686 24 1 Bodo wi 0647 ie ae jp MOS PROG 48K z uj i 1000PF __ 02153 gges Hk E c640 5 NI esi Rese 0 R699 250086 C655 CONN C639 1 5 J ISEN 21 5K 10 1 4 A544 UMP 1 680PF 4 er 7 009 C641 4 C711 WE Ya 100 1 513 071013 2 NAY gorr Ist I e C646 4 2 3 1000 end I 3
3. D gt amp PROG DIS Mens 601 63 SUMMING R618 5 QUT1 COMPARATOR C573 U603 TO PULSE ROS y FET BD m 21 5 d ek TRANSFORMER MID BAND 7 R602 PWM R607 UFSC alore AM gt 1511 2 AM GAIN BOOST 1574 GND PGND 209 500 C582 UFSC Z 0532 70533 t LORDED v 0534 Z0535 SLOW SENSE CONNECTOR 15U Cer R646 R645 65 ps d UF SEN 2 3J810 4 mE 1M ISEN C j 3J510 5 ISEN lt lt 9J510 6 R630 R631 3U4 510 IMON gt 1M 1 21M TO GATE J510 8 UDP D538 DNPGM 1510 1 100K 506 Hur DP SHUNT R625 R626 OUT R629 261K 261K 14K R637 NNV 100K 0598 R627 R628 pP ROSA CUPROG gt ANN BESE Dess 82 5K 0 1 261K 261K 500 D637 zZ UDP URG UDP NOT LOADED V DOWN PROGRAMMER UFSC C593 14 5 CONTROL CIRCUIT 0 1 500 Figure 6 26 10 Control Board Schematic Diagram Sheet 3 of 4
4. 35 EE 35 35 WART OVERRUN 35 156 Index UART PARITY te ek ti ET 35 errormessa9e selflest e 35 errors calibration ee oer neath t tea acters nate AM 35 35 RE 9 33 factory calibration tee E 65 firmware ee u TEE GNE firmware Dn EUR 64 Form performance test record eee recette ee de RR RAE ERR de PO Re eet 25 front panel EEPROM factory cal 67 imtializatlon OF ne e ERR e ou 67 transferring constants to eene eR 67 front panel operation eed e RA 7 front panel testing s s essi eR SHE LEER 34 G Sidi B 66 GPIBnterface testing aa AER Saat 34 i d ee 58 inhibit calibration JUMPE esses eR HERR AT RAE ERE NER EN Ree aa 66 Isolator board GIFCUHS2 e
5. 50 R27 R30 R29 R28 047 2 2 1 500 20U 4 64K lt 4 64K lt 4 64K lt 4 64K R37 HICO HIC 1 HIC2 HICZD 50 15 6 8 2 5 4 3 81 2411 5U 1 2 HICZ 047 3 5 4 HIC2 04 3 sl RPG SHIELD vec BE 25 11 aco 4 25 oa MTG 50 1 5 8 4 45 1 n a 9 Q PADS 5 2 UIC C7 ADCO 15 521 zf lao tto aqas 4 aca 15 5 45 6 acs ce 042 lapcz 18 S 1 Siy anca 1205 laa L1 AD 04 A7 B 20 29 ace 2 w anc21 2205 ang 248 5 C17 AD 07 10 55 810 4 11 8 57 2 2 SU 12 12 5 A12 1 3 GUARDING AC13 LCD DISPLAY e T5L Eod 414 31 14 peg PADS 5 2 UPP 1 pu HZ 7 2 41 i6 sp pul Ti ze 6 Ld V 270256 9 8 12MHZ 1 9 HOC3 5 10 rd rud Bes 2 V 3 12 53 54 2 1 HO 13 14 61 a2 40 zy 15 16 1000 1600 RD AD 0 7 sss 9 HSOS T3 aco 14 HS02 HSO1 C14 SU 042 1 sal ES 50 542 1 9 1 08 oc 11 1
6. 62 When Required eed abe 62 Inhibit Calibration peperere 62 Calibration Pass word taqata D er re rie Ree ge 62 Restoring Factory Calibration Constants eese eene enne nnne trennen trennen enn entries 62 EEPROM Initialization dan a P a u p 63 Transferring Calibration Constants To Factory Preset Locations ccscccsseessessseesceeseeecesecesceseceseceseesaecaeeeeceeeaeeeneeaes 63 Disassembly Procedures i 68 Tools Required ione e RR 68 TOP COVER 69 Removing Protective RFI Shield Galvanized Sheet Metal enne 69 GPIB Bo rd D e EI UTERE 69 e OE 70 A5 DC RAIL c 70 e e 70 AB FEET Board epe aa AE E RR 70 A10 Control Assembly sessile aa 71 Front Panel Assembly aaa eek 71 SI LineSwitch 1 2 ue ham Ee 71 Al Front Panel Board au as a Re 71 ATDSP ECD Display e RR 72 and Al G2 Rotary Gontrols
7. R400 2R401 R402 R403 R404 R05 DO NOT DO NOT DO NOT DO NOT DO NOT LORD LORD LORD LORD LORD LORD FUSE BRACKET BBS 1683208 OFF THE BOARD LINE FILTER CON CHASSIS WH RD GY WH RD GY WH RD GY E300 F1 406 B O NG O C400 MU 5 R407 GRAY GRAY GRAY 225 Y E401 E404 E407 O 1 01 22 5x 20W 2750 WH BR GY WH BR GY WH BR GY LINE 2 402 405 408 CONNECTION J418 1 INRUSH 24 50 1418 2 C428 4418 3 201 4418 4 4400 C429 J418 5 J418 6 O 01 ay 4418 7 J418 8 01 Razz 140 J418 9 ea 5 CONTACT J418 11 RELAY 1418 10 402 z 6 J418 12 LINE CHOKE CONNECTION DETRII 4 PHASE x PHASE PHASE 2 a 2 1 5 5 l EG RANGE 1 RANGE Rag 24 SU 4 6 1 e E411 RANGE 2 RANGE 2 RANGE 2 2 9 E412 e d INRUSH FROM BIAS BD 24 50 RANGE 1 BORSE T E ix MAIN 10 12 NOTE IF RANGE 1 IS SELECTED BY CHOKE PLUG PIN NUMBERS REFER TO J417 IF RANGE 2 IS SELECTED BY CHOKE PLUG PIN NUMBERS REFER TO J418 BIAS FUSE LED CONNECTOR RANGE 1 LINE CHOKE CONNECTORS SEE LINE CHOKE CONNECTION DETAIL RANGE 2 DC RAIL CONNECTOR Figure 6 12 A4 AC Input Board Schematic Diagram
8. 35 iR 35 vate hob skua Vete E aet a E RE See 35 EB s AT vases EORR EYE 35 EO teet ERO cs cts Rr RR VE ues or EVE vests ON users Svan RU vanes PUER VU eue fae SS 35 error code OVER cu e e teen ee o terti vitre Der 35 error code selftesta i o eo ente be eri i oiv Da 35 error message CAD DENIED inp o ei oin en dads o E p AD D REO HP ERES 67 DAC pne Ea p pen Ep cus n ean a poi hee E 35 BE CHKSM EDD REPRE EE E EUR ERE A n a p pon oo EP Een 35 BE WREITE ERR supna EPOD UN REP oe 35 35 PEROM 35 ERAMING gt n dy 35 35 PASSWD 67 PREIRAM teu vans Stu 35 upaya PRO Doo pen ea pam D 35 PRIOXRAM 35 e 35 SB EF OVERRUN aen 35 SEC Vio ere eese MOT IS 35 SECONDARY ier EUN 35 bt 35 NE aa ua 35 SERIA L DOWN
9. 72 ATKPD 72 Output Bus Boards 7 A81 and 9 Chassis Componetnts 72 Principles Of Operation P P 81 Introduction xut alit dep cle dat A 81 AD GPIB TM 81 aa 82 56 rue 82 Secondary Interface P O A10 1 1 1 41 12 2 24000000000000000000000000000000000000000000000 82 A4 AC Input Board sc Susu tum dederit 85 AS DE Rail n b RASS ane 5 AS FET Board Ras e 85 Output Circuits uen GE A LUE 6 Replaceable Parti a 89 INTRODUCTION 3 a EMT Sus d T 89 Chapter Organization eee Ra SRSA 89 Reading the Tables ccc ed Dente e 89 How Fo Order Parts ees Eon uad evtl Ee RA IDA EXT usa tnit Bede 90 Diagrams CR 115 Introduction er a a a e rano tbe tr oes 115 Chapter Orga
10. 1 In Table 5 14 A10 Control Board DELETE C548 0 10 50V P N 0160 4835 in parallel with RT 500 Change 2 In Table 5 7 A3 FET Board DELETE C228 231 2000pF 100V P N 0160 2301 ADD C228 6800pF 100V P N 0160 4904 CHANGE R247 from 75K P N 0757 0462 to 42 2K 1 1 8W P N 0698 3450 R249 from 13 1K P N 0757 0444 to 7 5K 196 1 8W P N 0757 0440 3349A 00104 3349 00108 3514 00123 3514A 00178 3619A 00203 US36420101 MY41000109 3339A 00103 3405A 00108 3405A 00109 3514A 00118 3514A 00188 3514A 00257 US36410101 MY41000115 Change 2 continued In Table 5 7 A3 FET Board CHANGE R250 from 60 4K P N 0698 3572 to 40 2K 1 1 8W P N 0698 3499 R253 from 12 5K P N 0698 6533 to 17 8K 1 1 8W P N 0698 3136 C229 from 0 022uF P N 0160 4918 to 0 01uF 100V Ceramic P N 0160 4832 In Table 5 9 A5 DC Rail Board DELETE C418 0 0220 250VAC Y rated P N 0160 4048 Fuse Clips REF F420 421 4 P N 2110 0726 qty 4 ADD Fuse Holder REF F420 amp 421 5 x 30mm P N 2110 0689 qty 2 CHANGE F420 amp 421 from 0 5A 500V P N 2110 0934 to 0 5A 500V 5x30mm P N 2110 0921 Backdating 149 3 In Table 5 14 10 Control Board DELETE C548 0 10 50V P N 0160 4835 in parallel with RT500 RT500 P N 0837 0412 Pins P N 0360 1498 qty 2 Change 4 In Table 5 14 A10 Control Board DELETE ASSEMBLY relay contactor P N 5060 3593 qty 1 ADD Dust cover for relay P N 9222 1870 Retainer clip for relay
11. nn sss enne rennen nennen enne 14 P Performance test record TORE POTE UG E HL e 25 performance tests CC LA E RAE SS 19 performance tests C V i eite T RIETI SERERE EVEN 16 power FETSyreplacin T M 47 ER RA ES 34 power on selftest disabling tr e PR LENTES ea 34 protective carti prona 9 R recotd sheet tesEs Sone SS uku uusha eee ere i te ARR E ps PPE 13 Teferencesupplyt 34 peo o EO HR RR ri erede aite Sa 14 removing Al Front Panel Assembly iade REO ERU PER 74 Ad ErontPatiel Board ost boo tbe tra s 74 A2 GPIB BOatd3 a sQ aaa ge D e e bre get ta i i evo e t e E e E SER 72 EET BO ard iuter bier o ee e DUE e ivt e RE eR e UE PR 73 WA AC Input Boatd al pne s p OE EU d eve e ite enit 72 AS Control BOatd bee E bentes viera lox 73 AG O tput Filter Board cc slender ii o ERE E vot s nit e dentes 73 AT SMUD DER Boards lcs tts assaka aquta 75 ac filter anms e EE RE EE eR UR PE T i ESR 72 73 heat imkleassempblyue gaa 73 Keypad 75 1 900 o tput choke
12. 75 line SWitcli o dee ee QR 72 output SURFER E 75 72 EE ASE A 72 RPGr Conttols rr T 73 T900 output y T A GSS D u Q U C S S u HS u 72 LOPE COV EE 73 Replaceable parts A2 isolator 2 1 41 1420000 00000000000000000000000000000000000 enne nnne 104 resistor tA le E Meck ect U ESS 12 158 Index resistor current monlttOE see ette ene eei reete or 12 resistor current E eese seen agi te e e eire d aet 12 S p M Ra 58 SA secondary interface exiting test eene ennt entrent nene tese tren trennen enne entere ns 58 SA signals URN E n de 59 SA signals secondary interface Raa 59 SA signatures identical re e IU OE 60 SA signatures RS 60 SA test header jumper siae nm RO 60 Schematic notes E Ie 145 SCPI programming AEROSOL I DD LE 8 secondary
13. RANGE 2 RANGE 1 Figure 6 13 5 DC Rail Board Component and Test Point Location TO DC RAIL CONNECTOR J420 CAC INPUT BOARD TO WH RD GY GREY WH BR CAC INPUT BOARD J419 2 J419 4 J419 3 J419 5 4419 1 BK OR BK GR BK WH BK YEL BKZRD 7X D422 54 2 GY M3 M4 PL BIRS INPUT LED2 R420 R421 R422 27 27 C420 C421 C422 5 5 1 1 1 2750 2750 2750 C418 419 DO NOT 7022 2500 LOAD 750425 T 54 5 NOTE E448 E449 E450 E451 E444 E445 E446 E442 R423 8 2K R424 8 2K R425 8 2K R426 8 2K R427 8 2K R428 8 2K 5 5 5 5 5 5 5 CONNECTS TO TO TO TO TO TO TO TO 1500 400U C425 1500 4000 448 1458 gt RD E449 O J438 6Y RANGE 1 RANGE1 J438 2 J438 3 J438 1 4458 4 4436 3 4456 4 4456 1 4432 2 1421 60A RANGE2 J439 2 J439 3 J439 1 4459 4 4437 3 4457 4 4437 1 4457 2 0484 1500 4000 4459 1 J438 1 J430 1 DC L J430 2 J439 4 J438 4 RANGE 1 C423 1500 400U J421 1 DC RRIL 2
14. 62 Troubleshooting EEPROM Initialization EEPROM AIU6 on the Front Panel Board stores the supply s GPIB address model number and constants required to program and calibrate the power supply If either the front panel board or the EEPROM is replaced the power supply must be reinitialized with the proper constants by running the program listed in Figure 3 18 When the program pauses and asks you to make a selection respond as follows Initialization D or Factory Preset Replacement I After the power supply has been initialized it must be calibrated as described in Appendix A of the Operating Manual After calibration transfer the new calibration constants to the EEPROM s Factory Cal locations as described next Transferring Calibration Constants To Factory Preset Locations A newly initialized and calibrated power supply has calibration constants in operating locations but does not have the new factory calibration constants stored in EEPROM This procedure transfers the calibration constants into the EEPROM FACTORY PRESET CAL locations by running the program listed in Figure 3 18 When the initialization program pauses and asks you to make a selection respond as follows Initialization D or Factory Preset Replacement F F The new calibration constants will then be stored Pre initialized and tested Al Front Panel boards are available for Analog Programmable bench series supplies See Chapter 5 Table 5 4 for par
15. 59 D660 AN DP TST Sheet 3 9 0502 12 COMPARATOR Sheet 3 General Schematic Notes The following table lists summary information about notes appearing in schematic diagrams Table 6 4 General Schematic Notes All resistors are in ohms 1 1 8W unless otherwise specified All capacitors are in microfarads unless otherwise specified Signal lines that are terminated by flags continue on other sheets and may also go to other locations on the same sheet Example CVPROG SH 2 8C SH 2 8C indicates the sheet number and the coordinates on that sheet where the CVPROG signal line goes Unterminated signal lines go to a least one other location on the same sheet Unless otherwise noted bias connections to integrated circuit packages are as follows Common 5V 14 pin packages 7 14 16 pin packages pin 8 pin 16 20 pin packages pin 10 pin 20 Diagrams 119 2 00 v div 5 00 v 5 00 w div 25 00 TEST POINT 2 00 V div 5 00 v 5 98 us div 25 00 u AER A NE 24 ER E 2 00 v div 0 00 v 5 00 div tt I3 TT TPP PPI P n LL IIIT EE J P T j T 5 098 us 2 00 V tiv 0 00 Y 1 00 5 000 us 2 99 v siv 0 00 v 5 00 us siv 25 00 us CNT ITI LI Eg qq BERRIEN um ss TEST POINT 63 TEST POINT TEST POINT 9 6 3 00 v 3 00 us giy
16. C V AD 7 2 4p 10 19 ance 3 sp 2048 ace 1 8 apcs 4 5 acs 3105 S p 401258840 eae sk 6 lay 5015 acs et R25 DI ap C10 Z le 60114 ace zs T5098 NMC9346 AD 8 7p 27a 9 Jan galaan 1 1 ALS573 5 3 7 23Koc4 424 TELE le le2Koc3 KIO KICA KICS 4 j oco 1 ni 7047 6 2 WS 5 POS 1 PLANE 50 V TP2 W6 D1 50 W8 RPG SHIELD 1 En 3 TAB OF 4200 C13 559 E 2000 BOARD 7047 4 6 5 F6 5 V RPG SHIELD 1 All resistor values are in OHMS 1 1 8 unless otherwise specified 2 All capacitor values are in microfarads unless otherwise specified Figure 6 4 A1 Front Panel Board Schematic Diagram otl 99999 o NIM in pade Ci o o CUNY sr viholo si 5 eq in O O 5 LO UD LN in Lo ON IY S a D N O w X X NX x Y E450 29016015 5 o Oak O d 06660 0451 DS451 E4520 E4530 E454 E455 456 O E457 NOTE This LED Board is only used on earlier version Agilent 668xA m
17. NO GO TO OV TURN ON DISPLAYED TROUBLESHOOTING FIG 3 4 CHECK IF OCP IS ENABLED AT TURN ON AND CURRENT IS DISPLAYED PROGRAMMED TO ZERO OR OUTPUT SHORTED Al REMOTE INHIBIT DISPLAYED CHECK FOR SHORT BETWEEN 2 1 3 AND GROUND Figure 3 1 Overall Troubleshooting Sheet 4 of 4 38 Troubleshooting WARNING THS CONFIGURATION IS FOR THE TEST ONLY DO NOT FLOAT THE OUTPUT OR ATTEMPT TO OPERATE THE SUPPLY TURN OFF SUPPLY AND REMOVE TOP COVER AND RFI SHIELD UNPLUG CABLE W5 FROM ON A2 GPIB BOARD UNPLUG CABLE W4 FROM J507 ON AIO CONTROL BOARD PLUG CABLE WS INTO J507 CONTROL BOARD THIS REMOVES THE GPIB BOARO FROM THE DATA PATH AND CONNECTS THE FRONT PANEL DIRECTLY TO THE CONTROL BOARD SEE WARNING TURN ON THE SUPPLY AND TRY TO PROGRAM THE SUPPLY FROM THE FRONT PANEL SUPPLY CHECK 2 GPIB OR ISOLATOR BOARD BUS CIRCUITS OPERATES AND PCLR SIGNAL TEST POINTS 1 4 TABLE 6 3 PROPERLY CHECK CABLE W4 TURN OFF THE SUPPLY IN ORDER TO ACCESS CIRCUITS ION FRONT PANEL BOARD REMOVE A1 FRONT PANEL i ASSEMBLY TURN ON THE SUPPLY CHECK 5V BIAS 1 6 ie CONNECT METER COMMON TO 81 3 SEE FIG 6 6 BIS VOLTAGES CHECK AICI RI RTE CHECK THE FOLLOWING DISPLAY VOLTAGES LIV AT Ms R1 14 22 AT RI 2 CHECK A130502 U504 A2U800 U804 CHECK 12 MHz CLOCK SIGNAL AT A1U3 66 SEE FIG 3 17 SHEET 2 CHECK 4 U3 CONNECT EXTERNAL VOLTMETER TO
18. 513 TO V2 FULL SCALE cc 100514 I PIN 2 gt 1 WITH RESPECT TO PIN 8 IS PIN 2 WITH RESPECT TO 8AD PIN 8 5 PN 6 5V PIN 2 SHORTED REPLACE DAC TO PIN 67 INCONCLUSIVE TEST REPLACE OP AMP Figure 3 9 CV CC DAC and Amplifier Circuit Troubleshooting Troubleshooting 47 5 SERIAL DOWN DISPLAY READS SERIAL DOWN OR SERIAL TIMEOUT SEE NOTE 0 TURN OFF SUPPLY ANO REMOVE TOP COVERS AND RFI SHIELD UNPLU J5 FROM ON THE 2 GPIB BO OR UNPLUG W5 FROM J80t TH ISOLATOR BO UNPLUG W4 FROM J502 ON THE A5 CONTROL BD PLUG CABLE WS INTO J502 SEE WARNING TURN ON SUPPLY AND TRY PROGRAM IT FROM THE FRONT PANEL THIS REMOVES THE GPIB OR ISOLATOR BOARD FROM THE DATA PATH AND CONNECTS THE FRONT PANEL DIRECTLY TO THE CONTROL BOARD THIS CONFIGURATION IS FOR TEST ONLY DO NOT FLOAT THE OUTPUT OR ATTEMPT TO OPERATE OPERATE THE SUPPLY IN THIS CONFIGURATION TURN OFF SUPPLY REMOVE FRONT PANEL ASSEMBLY SUPPLY OPERATES PROPERLY TURN OFF SUPPLY RETURN CABLES W4 AND W5 TO THEIR ORIGINAL POSITIONS SYSTEM POWER SUPPLY TO GAIN ACCESS TO CIRCUITS ON FRONT PANEL BOARD Al TURN ON SUPPLY CHECK FOR PULSES AT A3A1U3 17 AND 18 SEE FIG 3 15 CHECK CABLE W amp GO TO TROUBLE SHOOTING ISOLATOR BOARD TURN SUPPLY ON AND CHECK PCLR SIGNAL AT 2 01 6 TEST POINT SEE TABLE 6 3 ON THE GPIB BOARD ALSO CHECK 1 2MHz SIGNAL A2U
19. 60 Troubleshooting Table 3 7 Secondary Interface SA Test Description These signatures check the secondary microprocessor 50504 Valid A5U504 ROM Firmware Revision A 01 04 Test Setup See Figure 3 17 1 Turn off the power supply and remove the top cover 2 To obtain a setup that allows access to components and test points on the 5 Control Board follow the procedure given in Table 3 3 under A5 Control Board Setup 3 Connect signature analyzer CLOCK START STOP and GROUND inputs and setup as shown in Figure 3 15 4 To place the secondary interface in the SA mode turn on the power supply while momentarily for 2 seconds shorting 50504 1 to 51 504 20 common 5 Use the signature analyzer probe to take the following signatures Power Microprocessor 5V IC4C 50504 1 F77H 50504 2 98 50504 3 1573 50504 4 2 50504 5 UHF8 50504 6 FSUC 50504 7 UH8C A5U504 8 23UC A5U504 9 0000 A5U504 10 IC4C 50504 11 IC4C 50504 12 76 50504 13 0042 50504 14 2189 50504 15 50504 16 1C45 50504 17 0010 A5U504 18 IC4C 50504 19 IC4C A5U504 20 0000 50504 21 0C98 50504 22 5PC7 50504 23 0000 50504 24 6 50504 25 A339 50504 26 A319 A5U504 27 A339 50504 28 0C98 ASUS504 29 1C4C 50504 30 0000 50504 31 1C4C 50504 32 0000 50504 33 0000 ASUS504 34 1C47 50504 35 0000 505
20. R801 802 R803 R804 R805 806 R807 808 809 R810 R811 R812 813 814 815 816 R817 R818 R819 R820 R821 R822 R823 R824 R825 R827 R828 R830 R831 R833 R834 R835 R836 Table 5 10 A6 Bias Assembly Replaceable Parts continued Ref Desig Agilent Part No 0180 4131 0180 3298 0160 4834 0180 3587 0180 0230 0180 4129 0180 4397 0180 4131 0160 4835 0180 4131 0180 0228 1901 0731 1901 0731 1901 0731 1901 0731 1902 0018 1902 3393 2110 0712 2110 0679 1252 1670 1252 8837 1252 0056 1252 5230 1251 7070 1252 0055 5060 3245 5060 3527 0683 3025 0683 0475 0698 0084 0698 3440 8159 0005 0698 0084 0698 3440 0699 0208 8159 0005 0757 0442 0698 6392 0698 6631 0699 0070 0698 4493 0757 0290 0757 0283 0699 0070 0757 0444 0757 0274 0757 0444 8159 0005 0757 0290 0757 0280 0757 0442 0698 0085 0757 0442 CAP 4 7uF 35V C F 2200uF 50V CAP 047uF 10 CAP 1000uF 50V C F luF 50V CAP luF 35V C F 100uF 63V CAP 4 7uF 35V CAP luF 10 50V CAP 4 7uF 35V 22uF 15V DIO PWR RECT DIO PWR RECT DIO PWR RECT DIO PWR RECT DIO ZNR IN941 Not Used DIO ZNR 75V 55 o FU SUBMIN 4A FUSE 1 5AM 125V CONNECTOR CONNECTOR CONNECTOR CONNECTOR CONNECTOR CONNECTOR HEAT SINK TRANSISTOR 1854 0828 ASSY HEAT SINK TRANSISTOR 1854 0828 ASSY RES 5 25W RES 4 7 5 25W RES 2 15K 1 RES 196 1 125W RES ZERO OHMS RES 2 15K 1 RES 196 1 125W RES 1 5 25W RES ZERO OHMS RES 10K 1 125
21. a 0 roto z 5 TER 9213 celo o 0 ren 0612 6019 ai 1612 6213 s 3 S219 ci Pi PITA QU N 3 1n c 3 5 o 3 za Sota POTA gt 9019 a 0113 2319 N peta gt 50 a 0 TIO Sr Ia ots bs nO 7 T x E 5 s 5 a 5 8 lt gt a Figure 6 7 2 GPIB Board Component Location 101 2 101 1 0121 LM309K UCC D108 5 0101 SENI y I SEN2 D110 REM MC3423 R104 GND 4 6 D107 J114 TELE JACK IN J115 TELE JACK OUT ps 4101 16 4101 15 4101 14 4101 1 J101 4 4101 3 4101 2 J101 1 1101 18 4 J101 1901 9 4101 20 Joer N N S AONO O UC R102 J101 22 gt V J101 22 9 J101 24 1 9 J101 125 4101 17 J101 9 J101 7 J101 8 J101 6 J101 5 J101 11 J101 10 4101 25 4101 26 CONN MTG HOLES T5U m AYO ono 20 UCC U122 DC TE REN REN IFC IFC NRFD NRFD NDRC NDAC DAV DAV ATN ATN SRQ SRQ 75161B GND 10 V C124 22 44 20U 34 sme po 2 2 7 SH 36506 pali9 0052 321508 ps OSDA prog p4 4 003 39 13 D 2 0103 41 220102 0101 23 CONT 0117 99
22. 0683 2255 RES2 2M R706 8159 0005 RES ZERO OHMS R707 6680A 0699 0088 RES 1 21M 6681A 6682A 0698 8826 RES 825K 6683A 6684 0698 8826 RES 825K R708 6680A 0698 3459 RES 383K 6681A 6682A 0698 3455 RES 261K 6683A 6684 0698 3455 RES 261K 112 Replaceable Parts Table 5 14 10 Control Assembly Replaceable Parts continued Ref Desig Agilent Part No R709 6680A 6681A 6682A 6683A 6684A R710 6680A 6681A 6682A 6683A 6684A R711 R712 R713 R714 R715 R716 R717 6680A 6681A 6682A 6683A 6684A R718 R719 R720 R721 R724 R725 6680A 6681A 6682A 6683A 6684A R726 R727 728 R729 R730 731 R732 R733 R734 R738 R741 6680A 6681A 6682A 6683A 6684A R742 R743 R744 R745 RT500 500 0500 0501 502 0503 0504 0757 0468 0757 0464 0757 0464 0698 5091 0698 3160 0698 3160 0698 5091 0698 0082 0757 0442 0757 0349 0757 0447 0698 3449 not used 0757 0442 0698 3162 0757 0458 0698 8093 0698 6630 0698 3279 not used 0757 0199 0698 6359 0698 6630 0698 6359 0698 6630 0698 6619 0699 0489 0683 2255 0698 8959 0757 0429 0698 3496 0757 0436 0698 3496 0698 3151 0698 4509 0698 8093 0683 0475 0698 6630 0837 0397 3101 1973 1826 2341 1826 1370 1826 0346 1826 1369 RES 130K RES 90 9K RES 90 9K RES 45K RES 31 6K RES 31 6K RES 45K RES 464 1 125W RES 10K 1 125W RES 22 6K 1 RES 16 2K 1 RES 28 7K 1 RES 10K RES 46 4K 1 RES 51 1K 1 RES 40K 1 IW RES 20K 1 RES
23. 360 440Vac J439 connects the two DC rails in series Each rail still supplies 300 Vdc to the FET board via J430 and J431 The 5 DC Rail board also contains the bias transformer and primary range select connectors J436 Range 1 and J437 Range 2 There are two LEDS DS420 DS421 which light when more than 40Vdc is present on the dc rails As a precaution always disconnect power supply from ac mains and wait 7 minutes before handling dc rail board Be certain that the LEDs are completely extinguished The 24 auxiliary bias fuse F420 and the standard bias fuse F421 are located on the dc rail board A3 FET Board The A3 FET board consists of two power FET stages connected between the rail and rail voltages and connected across the FET stages is a chassis mounted power transformer The entire circuit represents an H bridge configuration A complete stage consists of eight power FETs and two bridge driver ICs The power FETs are mounted on but isolated from the heat sink assembly The two power FET stages are isolated from each other The DRIVEIA IB and DRIVE2A 2B pulses received from the 10 Control board are used by the bridge drivers 7201 U202 U301 U302 to derive control pulses for the FET switches The width of the pulses determines the ON time of the FET switches thereby determining the magnitude of the output voltage or current DRIVEIA pulses turn on one set of RAIL Q301 Q311 and RAIL Q303 Q333 FETs causin
24. 7 J jumper 59 FACTORY PRESET CAL RU EPOR YR ER ERE P ap 59 C XE ee oo sure REPAS EO pen DR ER d E D PER enn 59 mota etait eoe aU ro etie edat 59 K keypad re tee e n edits 14 L line fuse OR RO OO EORR 9 line voltage s R Dusi u C u aaa 9 M manual backdating 244 thetic e S EEUU IRE EUER 8 N terc ETERNI 8 manufacturing date determining eee eecceecesscesecesecesecesecseecseecaeeenecaesseeeseessecsecaeceaecaaecsaecaeesaecaeecaeecaeseaeseneenseenreegs 8 message eet aee ve ERR 35 65 Index 157 Mnemonics signal names a u oomen ete erre tates 140 mutual cou pling test lead s t ee e EO Mire e 14 N noise testnB atte ITE Ho eruit 14 O operating manual peni ede iid 7 oscilloscope 54504 eee ede SRR 15 output heatsink assembly eese e eee idee rd 82 output rectifiers location of eee RED E RED A ERI RH 75 replacing u M 75 overvoltage maximum programmable
25. LED1 lt J431 2 J440 4440 2 NOT USED J440 1 WH BR TO J816 1 WH RD TO 4816 2 TO BIAS BD WH OR TO J816 3 WH YEL TO J816 4 E SESS NOT USED 1441 3 ES g SWITCH T803 BIRS FUSE 420 T801 T802 BIAS FUSE J437 4 gt ae i J437 2 gt MEAE J436 3 J436 8 J436 1 RANGE 1 RANG N BK 6R BK YEL BK 0R BK RD 3 SEC TO FROM 24U J433 3 BIAS XFMR 3PRIMARY 1803 453 4 MOUNTED ON E444 e E447 446 J432 5 58 5515 3PRIMARY 453 64 T801 T802 4432 1 F421 ENG lt J432 5 J43e e 5432 344 J4za 44 TO BIAS BD PRIMARY Sa Figure 6 14 A5 DC Rail Board Schematic Diagram OOOOOOOO eA ease DOO kal m 000 Hiza 8J9 r9 FEES Lo b 82 eo Le 9284 BH 8 5083 Figure 6 15 6 Bias
26. OP VIEW LOOKING DOWN OF PC BOAR A A2 GPIB Board Figure 3 16 Signature Analysis Connections Sheet 1 of 2 Troubleshooting 59 U3 OUTS TOP VIEW LOOK ING ON COMPONENT SIDE F PC BOARD START STOP CLOCK FRONT PANEL BOARD ALL MODELS Figure 3 16 Signature Analysis Connections Sheet 2 of 2 Table 3 6 Front Panel SA Test Description These signatures check front panel microprocessor AIU3 Valid A1U4 ROM Firmware Revision A 01 07 Test Setup See Figure 3 17 1 off the power supply and remove the top cover 2 To gain access to Al Front Panel Board perform steps 1 and 2 of the disassembly procedure for Al Front Panel Assembly see Disassembly Procedures 3 Connect SA jumper of connector J3 on Al Front Panel Board see Figure 3 15 4 Connect signature analyzer CLOCK START STOP and GROUND inputs and setup as shown in Figure 3 16 5 Turn on the power supply and use the signature analyzer probe to take the following signatures Power 5V 3395 Microprocessor AIU3 15 3395 A1U3 29 1029 AIU3 19 5520 30 0295 AIU3 20 954C 31 0000 AIU3 21 A552 A U3 32 3395 AIU3 22 2954 AIU3 33 0008 AIU3 23 0A55 3 34 040A 03 24 3395 AIU3 35 0102 AIU3 25 3395 AIU3 38 0002 AIU3 26 0000 AIU3 39 0020 AIU3 27 0000 AIU3 42 3395 AIU3 28 40 5 6 After completing the tests be sure to return the J3 jumper to its original position
27. OUTPUT VOLTAGE VOLTAGE WITHIN RIGHT BUT OUT SPEC SIDE SPEC GO TO SHEET 2 GO TO SHEET 4 CAUBRATE THE SUPPLY Figure 3 1 Overall Troubleshooting Sheet 1 of 4 Troubleshooting 35 A FROM SHEET 1 VOLTAGES READS DISPLAY READS RIGHT BUT OUTSIDE VOLTAGE READBACK CIRCUIT A10U51 U522 OR k SPECS RE ADBACK DAC CIRCUIT A10U512 U515 DEFECTIVE YES YES CALIBRATE SUPPLY i Cv TURN ON SUPPLY AND CHECK VOLTAGE AT ANNUNCIATOR A10U502 2 43 WITH RESPECT TO COMMON 9 SEE TABLE 6 3 TURN OFF SUPPLY CONNECT SHUNT GEE Low TABLE 3 9 ACROSS THE SUPPLY S OUTPUT LEVEL AT TP CHECK A10R530 U505 TERMINALS TURN ON SUPPLY AND PROGRAM FULL 43 SCALE VOLTAGE AND CURRENT CHECK 100502 OUTPUT CURRENT CURRENT WITHIN RIGHT BUT OUTSIDE CAUBRATE SUPPLY SPECS SPECS NO a fC oo TO SHEET 4 CURRENT READS CISPLAY READS RIGHT BUT OUTSIDE WITHIN SPECS SPECS CURRENT READBACK CIRCUIT A10US17 U522 U56 DEFECTIVE CAUBRATE SUPPLY iS CC ANNUNCIATOR TURN ON SUPPLY AND CHECK VOLTAGE AT A10U630 3 48 WITH RESPECT TO COMMON SEE TABLE 6 3 YES TURN OFF SUPPLY REMOVE SHUNT FROM OUTPUT TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO FULL SCALE PROGRAM TO 1 2 tow FS VOLTAGE CHECK THAT SUPPLY GOES INTO AN OV CONDITION PROT ANNUNCIATOR AND OUTPUT 0 CHECK A10U502 0 CONDITION GO TO OV WILL NOT FIRE OCCURRED TROUBLE SHOOT
28. P O U502 and returned to the secondary processor to indicate that the corresponding mode CV or CC is in effect In CV mode an OR gate diode D652 conducts and the CV loop regulates the output voltage A CV error amplifier P O U621 compares the programmed voltage signal CVPROG to VMON which is the output signal from the V_DIF amplifier P O U621 The range of VMON is 0 volts to 10 volts which corresponds to the zero to full scale output voltage of the supply If the output voltage exceeds the programmed voltage the OR GATE signal goes low causing the output voltage to decrease to the programmed value Conversely if the output voltage is less than the programmed voltage the OR GATE signal goes high causing the output voltage to increase to the programmed value An externally applied dc signal VPROG be used to program the output voltage A 0 volt to 5 volt VP level produces a proportional zero to full scale output voltage In CC mode an OR gate diode D651 conducts and the CC loop regulates the output voltage A CC error amplifier P O U620 compares the programmed voltage signal CCPROG to IMON which is the output signal of 2nd I AMP P O U620 The range of IMON is 0 volts to 10 volts which corresponds to the zero to full scale output voltage of the supply If the output current exceeds the programmed current the OR GATE signal goes low causing the output current to decrease to the programmed value Conversely if the output curr
29. Table 6 1 Summary of Chapter Contents OK Interconnections Drawing identifying each circuit board the cables between boards and Figure 6 2 schematic diagram for each board Schematics Show test points signal mnemonics component location grid coordinates and specific notes General notes applicable to all schematics are given in Table 6 4 Al Front Panel Board A2 GPIB Board A3 FET Board A4 AC Input Power Board 5 DC Rail Board 6 Bias Board 7 Snubber Board A8 Fast Sense Board A9 Down Programming Slow Sense Board A10 Control Board Table of signal name mnemonics Table 6 2 Parts location A drawing that shows the location of components on a circuit board is Figure 3 18 located next to the above circuit board schematic diagram A drawing showing location of each circuit board in the chassis is in Chapter 3 Test points Description of each test point Location of each test point is shown on the Table 6 3 appropriate schematic and its associated parts location drawing Diagrams 115 0 15 AD 0 AD 7 AMB_SENSE ANA 0 ANA 7 D 0 _D 7 D101 DI08 DAV DFI DFI EN DPS DN PGM DRIVE A B EOI FAC_CAL FAN_PWM FPRX KO 0 KO 5 KI 0 KI 5 116 Diagrams Table 6 2 Signal Name Mnemonics Description Address lines Address bus Ambient temperature sense Analog Signal readback bus Attention GPIB 15V bias supplies have stabilized BuFfered OV programming
30. not between the and output terminals Test Procedures Perform the test procedures in Table 2 4 The CV tests are Voltage Programming and Readback Accuracy CV Load Effect CV Source Effect CV Noise PARD Transient Recovery Time Note The tests are independent and may be performed in any order 14 Verification Electronic Load a CV Test Setup with 5KW Electronic Load Resistor 5KW Load b CV Test Setup with 5KW Load Resistor Note Start with switch closed take full load reading open switch and take no load reading Figure 2 1 Constant Voltage CV Test Setup Verification 15 Table 2 4 Constant Voltage CV Tests Voltage Programming and Readback Accuracy This test verifies that the voltage programming GPIB readback GPIB system power supplies only and front panel display functions are within specifications With system power supplies values read back over the GPIB should be the same as those displayed on the front panel 1 Turn off the power supply and connect a DVM across S and S see Fig 2 1 2 Turn on the power supply with no load and program the output for 0 volts CV annunciator on Output current near and maximum programmable current see Table 2 2 0 3 Record voltage readings at DVM and on front panel display Readings within specified Low Voltage limits 4 Program voltage to full scale see Table 2 2 5 Record voltage readings of DVM and on front panel display
31. 1 8W 10K 222 25 26 1K ALL CAPACITOR VALUES ARE IN MICROFARADS R211 R245 VREF bes 9204 pz 100 5x B sx 17 44 13 4200 v 1 44 UREF 1 M ANS esu 1007 1 3 R243 3 05904 R251 2 a 9 09 UREF COMPENSATION re SEM C222 0228 I IXFMR2B DUTY CYCLE DU 2000 2000PF 7509 DETECT 1904 Y 25 Figure 6 10 FET Board Schematic Diagram sheet 2 of 2 2 Ons E402 E400 C400 C402 C401 C 408 E404 J 401 O O t E413 E405 E412 O E411 E402 Q Li K40 359 o E O c4z0 O o o c amp d sies 9 5 e eo ine ap m me O x x S OG I lt gt x 1420 H i So 19 ces Figure 6 11 4 AC Input Board Component and Test Point Location
32. 12 FROM SIGNAL GENERATOR DRIVE SIGNAL U201 9202 U301 0302 PINS 1 7 D L201 L204 213 1216 L301 L304 DRIVE SIGNAL L313 L316 DRIVE SIDE E 1201 1204 L213 L216 L301 L304 L313 L316 REGUALTOR SIDE Figure 3 13 A3 FET Board Test Waveforms Troubleshooting 55 Signature Analysis Introduction The easiest and most efficient method of troubleshooting microprocessor based instruments is with signature analysis SA This technique is similar to signal tracing with an oscilloscope in linear circuits Part of the microprocessor memory is dedicated to SA and a known bit stream is generated to stimulate as many nodes as possible within a circuit Because it is virtually impossible to analyze a bit stream with an oscilloscope a signature analyzer is used to compress the bit stream into a four character signature By comparing the signatures of the IC under test to the correct signature for each node you can isolate faults to one or two components The following general rules apply to signature analysis testing 1 sure to use the correct test setup connections for the specific test 2 When examining an IC note the correct signatures for Vcc 5V and for common If an incorrect signature matches either one it probably indicates a short to that part of the circuit If two IC pins have identical signatures they are probably shorted If two IC signatures are similar it is only a coincidence 5 Ifan input pin of an IC ha
33. 14 TRIG i PREN ACCRA 19 6 REN 18 25 IFC 16 22 NRFD 17 26 NDAC 15 29 DAU 14 30 EOI 13 31 12 SRQ GND HSRG 22 ISRG 500 142 V 420PF 50U Y A 0 15 C132 047 509 ROM CLOCK RAM FP HPIB PTX URRT FPRX RDY MSRQ BANKSEL ISRQ RD DFI EN WR SRX 50 C135 i 101 22 Sallis v 1 12MHZ 1 C108 C107 0 1 1101 509 22PF 2 144 0 42UH 50 5 100 SL C123 C126 LLL R143 gg 1 100 L 66 Tay 27 R140 26 505 13 25 504 12 4 64K 34 HSO3 DUT1 se rso2 MSRQ 5g 501 55 500 HSIO 1 01 58 2 TSL 1 02 35 P2 R141 22 2 P2 4 64K E 2 8 18 RxD TxD PREN 9 4 64K R129 10 PO R121 464K PO 2 R142 6 4 64K Z 59 5 4 64K 4 1510 3 TSL 15 2 t AGND 1 0 1 086 16 RESET x2 37 74 VPP RDY 6 80 U114 3 800196 aS NMI CLOCK CLKOUT 0139 BUSWIDTH 042 USS2 USS1 509 V DFI_EN FPTX PRX STX HSRQ CLK1 CLK2 1MHZ 16 AC4 15 AC3 14 R 2 13 AC1 ES CLEUIS PCB MTG 6 HOLES CLEUIS U106 ez A0 ROM A1 Re 25 A3 A4 D 0 13 pao A7 DC1 14 DQ1 D a 15 D 3 18 poe 03 Dean 191005 810 DCS 20 004 11 005 A12 D 6 21 006 A
34. 3 lt AMP R6o4 509 ue C654 4 250UAC Lo AMP 1 22 1000 R714 11 Pen 1000PF 22 6K 250VAC 7 IMON v E BUFFER NDe72 R692 15V 15 A 150K x R715 Ax i 104 15 TPROG 4 U624 16 2K c 4 10 AMP 7ND673 T3 7 UR641 SHUNT_TRIM R727 R730 R233 40 619K 2 X 11 LM324 C652 1710W R739 CCPROG gt R716 52 AAA CC ANALOG PROGRAMMING 28 7K 150 R724 APROG_DIS 062414 R718 93225 1 46 4K LM324 11 51 1K CC CLAMP BOK Le AMP Lad Figure 6 26 A10 Control Board Schematic Diagram Sheet 4 of 4 Backdating A Manual backdating describes changes that must be made to this manual for power supplies whose serial nunbers are lower than those listed in the title page to this manual Look in the following table and locate your Agilent model Then look at each serial number listed for this group If the serial number of your power supply is prior to any of the serial number s listed perform the change indicated in the Change column Note that several changes can apply to your supply Serial Numbers Model 6680A 1 2 4 5 6 3318 00111 3318A 00116 3502 00126 3619 00167 536480101 SG41000110 3319A 00154 3336A 00164 3350A 00172 3350A 00183 3350A 00193 3506A 00218 3619A 00383 US36400101 MY41000114 3349A 00104 3349A 00108 3514A 00123 3514A 00168 3624A 00193 US36440101 MY41000106 a ONW ON
35. 4 99K 1 RES 21 5K RES 80K 1 RES 20K 1 RES 80K 1 RES 20K 1 RES 15K 1 RES 16 15K 1 RES 2 2M 5 25W RES 619K 1 RES 1 82K RES 3 57K RES 4 32K RES 3 57K RES 2 87K RES 80 6K 1 RES 40K 1 IW RES 4 7 5 25W RES 20K 1 Thermistor SW SL 71A IC REG TL7702BCP IC 365 IC OP AMP IC VOLTAGE REG Replaceable Parts 113 Table 5 14 10 Control Assembly Replaceable Parts continued U506 5080 2305 PRGMD IC SEC 0507 1820 3079 IC MC74HC138N 0510 511 512 1826 2187 IC CONVERTER DIA U513 514 515 1826 1896 IC LINEAR U516 517 1826 1370 IC 365 1820 3081 IC MC74HC74N 1826 1231 DIA 8 DGT 1826 1409 IC 1013 1820 3199 IC MC74HC4040N 1820 2922 IC MC74HCOON 1820 3081 IC MC74HC74N 1826 2343 IC VRGLTR SWG 1820 2922 IC MC74HCOON 1826 0065 IC 311 1858 0083 XSTR ARY 14P DIP 1826 0962 IC 412 1826 0890 IC 358A 1826 1343 IC VOLTAGE REG 1826 1409 IC 1013 1826 1895 PRECISION OP AMP 1826 1896 IC LINEAR 1826 0161 IC 324 1902 3114 DIO ZNR 6 19V 2 1902 0777 DIO ZNR IN825 1902 1377 DIO ZNR 6 19V 114 Replaceable Parts Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining Agilent Series 668xA Power Supplies Unless otherwise specified a drawing or diagram applies to all models of the series Wiring connections to external equipment are shown in the Power Supply Operating Manual Chapter Organization Table 6 1 summarizes the contents of this chapter
36. 65 calibration procedure doeet on ee RE 7 CC ani ncl atot pi RR naa RO SD BORA qu dep ae 55 CC load effect testing o ox Si a dein 26 CC noise BARD testing ii iid nea URN ene n RI edi hee E 18 CC PARD defined a oe teilen eene eee ie oa eee edt 18 Circuits isolator M 84 conductive table mat ertet e ct 9 conductive WrISESUDy L dte hen Tp Rae 9 configuration jumper FACTORY PRESET CAD Sa Sa S eR e EPICUREI OHNE ERAN REA ERE 59 TE LINBO RES RES EAE EROR eS S oh TCR eaten PH RETE ve nishaka Enea 59 CAT siete iot e UR A EREMO REFERO aene ene SE a C PER 59 RELAY LINK ERR UNO e REED 59 SA mode UT 59 Current maximum programmable a a ener enne ener entree nenne RSS RS 19 current SCC EE 19 current programming and readback accuracy testing eene nnne ener enne 19 current sink and readback accuracy testing esses eene enne enne 19 CVICCG status annunclators dme Chet en ettet ERI Oen te 54 GV load Hect defined s te oet
37. 6683A 6684 0757 0280 RES IK 1 R662 0757 0273 RES 3 01K 1 R663 0698 3456 RES 287K 1 R664 0698 3155 RES 4 64K 1 R665 0757 0273 RES 3 01K 1 110 Replaceable Parts Table 5 14 10 Control Assembly Replaceable Parts continued R666 6680A 0698 8913 RES 1 5M 1 6681A 6682A 0683 2255 RES 2 2M 1 6683A 0683 4755 RES 4 7M 1 6684 0683 5655 5 5 6 1 R667 6680A 0757 0465 RES 100K 1 6681A 0757 0462 RES 75K 1 6682A 6683A 0698 3455 RES 261K 1 6684 0757 0473 RES 221K 1 R668 0698 3279 RES 4 99K 1 R669 6680A 0757 0462 RES 75K 1 6681A 0698 4503 RES 66 5K 1 6682A 0757 0273 RES 3 01K 1 6683A 0757 0480 RES 432K 1 6684A 0698 3456 RES 287K 1 R670 6680A 0699 1742 RES 70K 1 6681A 6682A 0699 1211 RES 95K 1 6683A 6684 0699 0460 RES 85K 1 R671 0699 0070 RES 3 16M 1 R672 6680A 0698 8093 RES 40K 1 6681A 6682A 0699 0118 RES 20K 1 6683A 6684 0699 0461 RES 30K 1 R673 0699 2247 RES 121K 05 R674 0699 0461 RES 30K 1 R675 0698 3279 RES 4 99K 1 R677 0699 0461 RES 30K 1 R678 679 6680A 0699 3414 RES 45K 6681A 6682A 0699 2246 RES 25K 0 05 6683A 6684 0699 2246 RES 25K 0 05 R680 6680A 6681A 0699 3103 RES 19K 0 05 6682A 0699 2248 RES 47 5K 0 05 6683A 0699 2879 RES 80K 0 05 6684A 0699 3416 RES 100K 0 05 R681 6680A 6681A 0699 3103 RES 19K 0 05 6682A 0699 2248 RES 47 5K 0 05 6683A 0699 2879 RES 80K 0 05 6684 0699 3416 RES 100K 0 05 R682 6680A 0698 6322
38. Bias Board Schematic Diagram Sheet 1of 2 2 5U 24 50 3 4 Siak DEW 1 21 R820 lt R821 COMPARATOR R825 9 UB08 5 10 345 12 1K 6 p 3 0802 2 5U 8 DEW ULN 9 UB08 FROM J821 mM CHd N aa HIGH 2003A z 14 INRUSH RELAY COIL AC INPUT BD J821 1 E a I i ULN RAIL RELAY COIL SS SSS SS SS SS eS SS ES ES 2003A J827 3 NOT USED 12 424 5U n 1 RB24 15U SECONDARY R830 3 NNV 200 ULN 3A x V 24 50 UNREG DEW RAIL DELAY WRONG LINE INHIBIT 24 50 R868 24 50 BIAS 21 5K DETECT CIRCUIT RESET 9 0808 gt 7 10 ULN 4 846 10K 2003A 2 550 J801 NOT ON BIAS BD 1801 1 4 0 1 18 5U TO l R848 EE 00 30K 24 50 FAN SPEED CONTROL CIRCUIT 27 0U 200 f ran J J801 2 IHSBEO 6851 seta EONS R849 J801 3 9820 2 0821 2 0822 e HPIB 1 3 3K 5 R851 R857 R875 1744 1 222 1 1 HPIB 2 46 4 A 46 4 A 46 4 J801 5 R850 TIP122 s 22 3 22 5 2 NNV FAN PHM BOK 1 x R856 5852 5 48 ress reso RB6O R
39. BuF fered secondary transmit Constant current status Constant current programming Constant voltage status Constant voltage programming Data lines Data lines GPIB Data valid GPIB Discrete fault indicator Discrete fault indicator enable Downprogramming shunt Down programming FET drive signals End or identify GPIB Factory calibration Fan pulse width modulation Front panel receive serial data Front panel transmit serial data Fast sense GPIB service request Interface clear GPIB Current monitor Inhibit calibration External current programming Current programming Current sense Interface service request Keypad output data bus Keypad input data bus Mnemonic MSRQ NDAC NEG_IMON NRFD OV OV_CLR OVCMP OVP_BIAS OVPROG OVSCR PCLR PREF PREF_2 PREN PRX PTX PWM_EN RAM RDY REN RI ROM SPCLR RX RxD SA SRQ SRX Description Microprocessor service request Not data accepted GPIB Negative current monitor Not ready or data GPIB Overvoltage Overvoltage clear Overvoltage comparator Overvoltage protection bias Overvoltage programming Overvoltage SCR crowbar Primary power clear Primary reference voltage 2 53V Primary reference voltage 1 0V Primary remote enable Primary receive serial data Primary transmit serial data Pulse width modulator enable Random access memory Ready Remote enable Remote inhibit Read only memory Secondary power clear Receive serial data Receive Serial Data Signature analysis
40. OUTPUT TERMINAL S PROGRAM OUTPUT VOLTAGE CURRENT AT THE FRONT PANEL AND MEASURE VOLTAGE AT SUPPLY OUTPUT TERMINALS 4F THE OUTPUT IS DISABLED PESS OUTPUT KEY 5 OUTPUT VOLTAGE PRE SENT ANUJ U4 OR US DEFECTIVE PERFORM FRONT PANEL SA SEE TABLE 3 6 DSP OR CABLE W2 5 DEFECTIVE Figure 3 2 No Display Troubleshooting Troubleshooting 39 START h WILL NOT FIRE _ TURN OFF SUPPLY REMOVE COVER RFI SHIELD TURN ON SUPPLY AND CHECK BIAS AND REFERENCE VOLTAGES TEST POINTS 5 THROUGH 2 SEE TABLE 6 3 i TROUBLESHOOT THE DEFECTIVE CIRCUIT SEE BIAS SCHEMATIC TURN SUPPLY ON AND PROGRAM THE OUTPUT VOLTAGE AND CURRENT 1 2 SCALE PROGRAM THE TO ZERO INSURE THAT OUTPUT VOLTAGE 15 AS PROGRAMMED AND THE OVER VOLTAGE CONDITION 15 NOT DETECTED ANNUNCIATOR IS OFF CHECK VOLTAGES 100502 12 70 AND A10U502 14 63 WITH RESPECT TO COMMON 36 See TABLE 6 3 NOTE 0502 14 PULSES ARE LOW WHEN FIRES P APPROXIMATELY 1 MILLISEC A10U502 12 A10U521 7 NEGATIVE OV CHECK A10U505 109501 CHECK A10C520 R534 to R539 0508 A10U502 14 CHECK A10U502 LOW CHECK A10U505 Figure 3 3 OV Will Not Fire Troubleshooting 40 Troubleshooting START OV TURN ON WARNING DURING THESE TESTS THE OUTPUT MAY BE AT HAZARDOUS LEVELS CHECK THAT SUPPLY IS NOT PROGRAMMED TO CAUSE AN OV AT
41. P N 1460 2317 Relay P N 0490 1919 Change 5 In Table 5 8 A4 AC Input Board DELETE C428 429 and 430 P N 0160 7898 R435 436 and 437 P N 0698 3609 Change 6 In Table 5 6 A2 GPIB Board CHANGE 2 GPIB board from P N 5060 3591 to P N 5060 3552 see Table A 1 and Figure A 1 Change 7 In Table 5 6 A2 GPIB Board CHANGE 0114 from P N 1826 0536 to LM309K P N 1820 0430 Change 8 In Table 5 13 A9 Downprogrammer Slow Sense Board DELETE Insulator REF Q981 982 CHANGE Q981 982 from P N 1855 1003 to POWER MOSFET P N 1855 0835 Change 9 In Table 5 4 A1 Front Panel Board DELETE PCA keypad P N 5063 3407 CHANGE KNOB Ref RPG from P N 0370 3238 to P N 10370 1091 RPG OPTICAL ENCODER from P N 0960 0912 to P N 0960 0822 UA from 5080 2466 to P N 5080 2304 Change 10 In Table 5 3 Main Chassis Mechanical parts DELETE CABLE P N 5185 1343 ADD SENSOR MOISTURE P N 0960 0882 In Table 5 4 Front Panel Mechanical parts CHANGE LABEL from PN 5185 1342 to P N 5080 2245 In Table 5 8 A4 AC Input Assembly ADD R400 405 75K 5 2W P N 0764 0027 150 Backdating Change 10 continued In Table 5 10 A6 Bias Assembly DELETE R830 ZERO OHMS P N 8159 0005 ADD D830 DIODE IN4150 P N 1901 1098 Table 1 2 GPIB Parts List Ref Desig Agilent Part No Description ELECTRICAL PARTS C102 105 0160 4822 Capacitor 1000pF 5 C106 0180 0155 Capacitor 2 2 20V C107 108 0160 4787 Capacitor 22pF 5 100V C109 111 114 11
42. Parts 91 Table 5 3 Main Chassis Replaceable Parts continued 2110 0910 FUSE see 5060 3513 2110 0911 FUSE see 5060 3512 3160 0419 FAN FINGER GUARD 3160 0571 FAN TUBEAXIAL 5001 0538 TRIM SIDES 5001 0539 TRIM SIDES FRENCH GRAY 5001 6776 CHASSIS BASE 5001 6778 PANEL REAR 5001 6779 COVER OUTSIDE 5001 6780 INPUT SUB CHASSIS see 5060 3490 5001 6781 OUTPUT SUB CHASSIS 5001 6782 CHASSIS TOP inside cover 5001 6783 INPUT DECK 5001 6784 OUTPUT DECK 5001 6791 TRAY control board 5001 6792 SHIELD 5001 6793 GPIB BRACKET chassis top 5020 2783 HEATSINK DIODE 5020 2785 HEATSINK FET 5020 2797 SHIELD ISOLATION 5020 2808 INSULATOR 5040 1688 BUSS BEZEL 5040 1689 BUSS BAR SUPPORT 5040 1690 BRACKET HS 5040 1691 HS PLEN 5040 1694 BUSS BAR PLUS output end large 5040 1696 BUSS BAR PLUS internal end small 5040 1697 BLOCK TOP COVER 5040 1700 COLLAR MOLDED 5040 1701 BUSS BAR BRACE 5041 880 1 FOOT 5041 8819 CAP STRAP HANDLE 5041 8820 CAP STRAP HANDLE 5060 3237 AC INPUT COVER ASSY 5060 3490 AC SUB CHASSIS ASSY 5060 3489 NEGATIVE OUTPUT BUSS BAR ASSY with L902 L903 CORE 5001 6780 SUB CHASSIS 5080 2262 3 PHASE LINE CHOKE 5080 2298 CABLE 3 phase line choke AC input assy 9100 5044 FAN TRANSFORMER 5060 3492 WIRE KIT sense leads 5060 3512 400VAC 16A FUSE KIT 2110 0911 3 ea FUSE 16AM 400VAC 5060 3513 208VAC 30A FUSE KIT 2110 0910 3 ea FUSE 30AM 500V 5062 3705 STRAP HANDLE 5080 2038 LABEL WARNING no operator serviceabl
43. RES 4K 0 1 6681A 0698 7163 RES 2 0081K 0 1 6682A 0698 8061 RES 8 25K 0 1 6683A 6684 0698 6322 RES 4K 0 1 R683 6680A 0698 6322 RES 4K 0 1 6681A 0698 7163 RES 2 0081K 0 1 6682A 0698 8061 RES 8 25K 0 1 6683A 6684 0698 6322 RES 4K 0 1 Replaceable Parts 111 Table 5 14 10 Control Assembly Replaceable Parts continued R684 6680A 0757 0280 RES IK 1 6681A 0757 0289 RES IK 1 6682A 0757 0430 RES 2 21K 1 6683A 0698 3496 RES 3 57K 1 6684 0757 0436 RES 4 32K 1 R685 6680A 0757 0280 RES IK 1 6681A 0757 0289 RES IK 1 6682A 0757 0430 RES 2 21K 1 6683A 0698 3496 RES 3 57K 1 6684A 07577 0436 RES 4 32K 1 R686 6680A 8159 0005 RES 0 0 6682A 0698 8911 RES 1 3K 1 6683A 0699 0486 RES 2 0K 1 6684A 8159 0005 RES 0 0 R687 0698 8093 RES 40K 1 R689 0698 5365 RES 3 48K 196 R690 6680A 6681A 07577 0395 RES 56 2 6682A 6683A 0757 0403 RES 121 6684A 0698 6362 RES 1 0K 1 R691 6680A 6681A 0699 1011 RES 3 32K 1 6682A 0698 8911 RES 1 3K 1 6683A 0698 7163 RES 2 0081K 1 6684 0698 8911 RES 1 3K 1 R692 0698 6620 RES 150K 1 R693 694 0698 3430 RES 21 5 1 R695 0698 8093 RES 40K 1 R696 697 0698 6414 RES IK 1 IW F R698 699 0698 6323 RES 100 1 R701 702 0757 0442 RES 10K 1 125W R703 6680A 0757 0446 RES 15K 1 6681A 6682A 0757 0443 RES 11K 1 6683A 6684 0757 0443 RES 11K 1 R704 0683 1065 RES 10M 5 25W R705 6680A 0699 0070 RES 3 16M 6681A 6682A 0683 2255 RES 2 2M 6683A 6684
44. Receptacle LCD display 1251 4926 Receptacle test header 1252 0718 Receptacle A3G1 A3G2 1251 8184 Receptacle phone GPIB board 9140 0158 Inductor 1uH 10 1810 0560 Resistor network DIP 0698 3359 Resistor 12 7K 1 R23 25 27 30 0698 3155 Resistor 4 64K 1 R37 1810 0371 Resistor network SIP R38 0698 3441 Resistor 215 Q 1 0 125W R39 40 0698 3155 Resistor 4 64K 1 RT1 0837 0412 Thermistor Replaceable Parts 93 Table 5 4 1 Front Panel Board Replaceable Parts continued Ref Desig Agilent Part No Description 3101 3088 Line switch 1902 0950 Diode Zener 4 7V 5 1820 6721 IC MPU 5080 2466 ROM programmed front panel 1818 4792 IC memory 1820 2724 IC SN74ALS573BN 1258 0209 Jumper J3 0811 3590 Jumper 0410 2159 Crystal 10 MHz 1902 0950 Diode Zener 4 7V 5 MECHANICAL PARTS 1200 1274 Socket IC U3 1200 1417 Socket IC U4 0340 1277 Insulator Y 1 0370 3238 KNOB Ref RPG 0515 1455 SCREW Ref keypad PCB to front frame 0590 0534 NUT SELFTREAD Ref Display board to front panel 0960 0912 RPG OPTICAL ENCODER 5063 3408 PCA KEYPAD 1000 0842 WINDOW Ref 3 inches front frame 5001 6794 BLINDER Ref 5 inches front frame 5040 1665 KEYPAD 5040 1687 FRONT FRAME 88 1mm 2 5 inches 5040 1698 FRONT FRAME 132 6mm 5 25 inches 5063 3473 LCD DISPLAY 5185 1342 LABEL Ref 3 5 inches amp 5 inches front frame 5080 2261 CABLE Ref Keypad PCB to LCD display Table 5 5 Front Panel Board LED Assy Replaceab
45. Repeat Steps 4 and 5 Both current readings within specified High Current and readback limits Verification 19 Table 2 5 Constant Current Tests continued CC Load Effect This test measures the change in output current resulting from a change in load from full load voltage to a short circuit It is recommended that you use averaged readings for Steps 5 and 6 of this test see Averaging AC Measurements at the end of this chapter Note Refer to Figure 2 4 If you are using Agilent 60504B Eloads a series DC power source is required to supply the minimum 3 volt input required by the Agilent 60504B Eloads The series DC source must be capable of 3VDC at a current level greater than the output current of the supply being tested A switch can be used in place of the series supply if the Eloads are used in place of a load resistor as shown in Fig 2 4 b Turn off the power supply and connect a DVM across the current monitoring resistor see Fig 2 3 Turn on the power supply and program the current to its full scale value and the voltage to its maximum programmable value see Table 2 2 Set the Electronic Load to CV mode and its voltage to full scale as Power supply output current is full scale indicated on its front panel display Set the series supply for 3VDC and a and its CC annunciator is on If not current greater than that being tested Series source should be in CV mode reduce the Electronic Load voltage slightly until
46. Required Equipment Purpose Recommended Model Logic Probe To check states of data lines Agilent 545A Test Clips To gain access to IC pins AP Products No LTC Ammeter Current Shunt To measure output current Agilent 6680A amp 6681A Burster 1280 Agilent 6682A 6683A amp 6684A Guildline 9230 300 Oscilloscope To check waveforms and signal levels Agilent 54504A Signature Analyzer To troubleshoot most of the primary Agilent 5005A B and secondary interface circuits GPIB Controller To communicate with power supply via Agilent BASIC series the GPIB for system units DC Voltmeter To measure output voltage and current Agilent 3458A bias and references Troubleshooting Procedures Power On Selftest Description The procedures in the troubleshooting charts make use of the power on selftest The power on selftest tests the front panel GPIB interface for GPIB system power supplies and secondary interface circuits If the power supply fails the selftest the output remains disabled turned off and the front panel normally displays an error code or message see Table 3 2 The message is displayed indefinitely and the power supply will not accept GPIB or front panel commands Disabling The Power On Selftest In order to perform troubleshooting procedures that require programming of the power supply you must disable the power on self test Do this as follows Turn off the power supply Hold down the key and turn on the supply C
47. Service request GPIB Secondary receive serial data Secondary transmit serial data Transmit Serial Data Universal asynchronous receive transmit Voltage monitor Voltage offset Voltage programming Write Table 6 3 Test Points TEST POINT No amp Loc Signal Tested Measurement and Conditions A2 GPIB BOARD J106 4 Primary chassis ground Connect meter or scope common here Then make measurements at test points through j U101 1 5V primary bias 5V 0 2V U101 6 PCLR Goes high for approximately 40 ms at power on then goes low U101 8 PCLR Held low for approximately 40 ms at power on then goes high 5 0110 3 STX Primary transmit to secondary serial data line Toggles between 0 and 5V 0111 6 SRX Primary receive from secondary serial data line Toggles between 0 and 5V U119 4 FPRX Primary receive from front panel serial data line Toggles between 0 and 5V U119 18 FPTX Primary transmit to front panel serial data line Toggles between 0 and 5V AC Input Board Connect meter between 9 and or 9 and OF and and measure approximately 220VAC or 440VAC Measurements at test points through 1418 1 1417 7 AC Mains Voltage J418 2 J417 8 AC Mains Voltage J418 3 J417 9 AC Mains Voltage K402 coil 24VDC Coil Voltage Turns on PS and after power on initialization test reads approximately 24VDC DC Rail Board J430 1 to J430 2 Rail 1 Voltage Measure approximately 290 VDC J431 1 to
48. TURN ON ENSURE THAT THE VOLTAGE SETTING IS NOT GREATER THAN THE OV SETTING MEMORY REGISTER BY PROGRAMMING 0 VOLTS AND MAXIMUM OV THEN SAVE IN REGISTER O PRESS THE SHIFT SAVE ENTER KEYS TURN OFF SUPPLY CONNECT A DC SCOPE ACROSS THE SUPPLY S OUTPUT TERMINALS TURN ON SUPPLY AND CHECK THAT OUTPUT DOES NOT MOMENTARILY GO HIGHER THAN THE VOLTAGE SETTINGS MOMENTARILY GO TO OUTPUT HELD HIGH GOES HIGHER TROUBLESHOOTING FIG 3 6 TURN OFF SUPPLY AND REMOVE TOP COVER AND RFI SHIELD DISABLE THE OV INPUT BY LIFTING 108536 TURN ON SUPPLY AND CHECK THE OUTPUT VOLTAGE GO TO OUTPUT HELD HIGH TROUBLESHOOTING FIG 3 6 T CHECK A 10R535 108536 CHECK VOLTGES A10U521 7 04 atous02 12 70 AND A100502 14 63 WITH RESPECT TO COMMON 39 CHECK THAT A10U521 7 GOES FROM 0 v TO DOES MOUESI 7 APPROX 5 4 uV AS 0 V IS PROGRAMMED 5 4 0 5 V FROM 0 V TO 0 V MAXIMUM 1 100502 12 CHECK A10C520 0508 R539 gt 0 5V 5 A10U502 14 CHECK 100505 R533 C512 HIGH CHECK A10U505 R529 Figure 3 4 OV At Turn On Troubleshooting Troubleshooting 41 START OUTPUT HELD LOW SUPPLY S OUTPUT IS HELD LOW AND THE PROT ANNUNCIATOR IS NOT ON TURN OFF SUPPLY DISCONNECT THE LOAD REMOVE THE TOP COVER AND RF SHIELO TURN OFF SUPPLY 2 CHECK THE BIAS AND REFERENCE VOLTAGES TEST POINTS THROUGH SEE TABLE 6 3 6 3 dq 1 TROUBLESHOOT THE DEFECTIVE
49. VOLTAGES CIRCUIT SEE A6 BIAS OK SCHEMATIC CHAPTER 6 TURN OFF SUPPLY AND PERFORM 6 CONTROL BOARD TROUBLE SHOOTING SETUP TABLE 6 3 TURN ON SUPPLY AND PROGRAM OUTPUT OF 1 2 FULL SCALE VOLTAGE AND CURRENT PROGRAM OV TO MAXIMUM OCP OFF AND OUTPUT ENABLED Y PO 5 CC YES GO SHEET 2 ON NO fS UNR CHECK CV PROGRAMMING LEVEL ANNUNCIATOR AT 100613 6 69 ON USE A DIFFERENTIAL INPUT OSCILLOSCOPE TO CHECI FOR THE PRESENCE OF oo A10511 66 _ CHECK 100621 16D 7 A10U602 9 52 100600 10 AIOU607 Ai0U604 8 59 AND 100605 7 SEE CORRECT WAVEFORMS IN TABLES 6 3 AND FIGURE 6 1 ees CHECK VOLTAGE CALIBRATION SEE APPENDIX IN OPERATING MANUAL 15V YES SEE FET BOARD TROUBLE SHOOTING TABLE 3 4 CHECK A10U600 9601 0602 CHECK 10 502 U504 CHECK 606 607 7V 40KHz 5 GO TO SHEET 2 Figure 3 5 Output Held Low Troubleshooting Sheet 1 of 2 42 Troubleshooting FROM SHEET 1 YES CHECK VOLTAGE LEVEL 59 AT 6 3 60 NO v CHECK VOLTAG VEL CHECK A10U502 U504 AT U608 7 49 CHECK A10U603 CHECK A10U608 sm gt M CHECK A10U605 DISPLA IRCUITI READS 1 2 F S CHECK FOR SHORT CIRCU URRENT2 IN OUTPUT CHECK PROGRAM LEVEL AT 100514 6 40 n me ce n CHECK CURRENT CALIBRATION CHECK VOLTAGE LEVELS AT A10U620 1 47 AND A10
50. a variable load capable of dissipating the required power If a variable resistor is used switches must be used for connecting disconnecting and shorting the load resistor For most tests an electronic load see Table 2 1 is easier to use than a variable resistor However an electronic load may not be fast enough for testing transient recovery time or may be too noisy for testing noise PARD In these cases fixed load resistors of suitable power dissipation can be used with minor changes to the test procedures given in this chapter 12 Verification Programming The Tests General Considerations Procedures are given for programming these tests either from the front panel keypad or from a GPIB controller The procedures assume you know how to use the front panel keypad or how to program over the GPIB see the Power Supply Operating Manual for more information When using computer controlled tests you may have to consider the relatively slow compared to computer and system voltmeters settling times and slew rates of the power supply Suitable WAIT statements can be inserted into the test program to give the power supply time to respond to the test commands This power supply can provide more than 240VA at more than 2 volts If the output connections touch each other severe arcing can occur resulting in burns ignition or welding of parts DO NOT ATTEMPT TO MAKE CONNECTIONS WHILE OUTPUT POWER IS ON These connections should be performed onl
51. eiue tod NU e 16 CV load effect testing uina Re eno OON E t Ree ET UR Pak 16 ER pete ae badd EROR e e de Red SEEN vue EY Ie es 17 CV noise PARD testing a 42 d Re eit ea HU ed ent I tlie eee 17 Index 155 CV sSource effect dehined 1 97 1 teen sau s 17 CV a eee 17 CV transient response waveform sss oes 18 CV transient recovery tme defined 2 areas 18 CV transient recovery time testing oe ter de Ue 18 CV voltage programming and readback accuracy testing 16 D Diagram etos Redi E ede ate gere de ec tete dd 146 DIG CNTL port configuring cereo e ee 58 disassembly proced res esed ete se de 71 downprogrammer FETs eet eee eR 74 E electronic load RARI DEED RERO ER RR ED TEE de 12 20 errorehe ekS8mig 35 error code a 35 LEN HS Re aaah ee EUER Re Us a E rie RR Ne XR RYE RES Pees eerie RSEN POTETE AERE 35 iE 35 iE 35 GS YER EOS 35 E3 s hoa SR 35 E 35 F
52. is not adjust the front panel display the load to slightly reduce the output current until the annunciator comes on 4 Record the amplitude of the waveform Amplitude is within the specified PARD Peak to Peak limits 5 Replace the oscilloscope connection with an ac rms voltmeter 6 Record the reading obtained in Step 5 Amplitude is within the specified PARD rms limits Verification 17 Table 2 4 Constant Voltage CV Tests continued Transient Recovery Time This test measures the time required for the output voltage to return to within 100mV of its final value following a 50 change in output load current Measurements are made on both the unloading transient from full load to 1 2 load and the loading transient from 1 2 load to full load Turn off the power supply and connect an oscilloscope across S and S see Fig 2 1 Turn on the power supply and program the current to its maximum programmable value and the voltage to its full scale value see Table 2 2 Program the Electronic Load as follows Operating mode to constant current Input load current to 1 2 the supply s full rated output current Transient current level to the supply s full rated output current Transient generator frequency 100Hz Transient generator duty cycle 50 Turn on the transient and adjust the oscilloscope to display response See Fig 2 2 waveform Measure both the loading and unloading transients by triggering the Specified
53. points troubleshooting u o id d RR TEE EN p oe tette 35 Test point Wavetortns sono easement 144 tests constant curent mode s ood pem 19 constant voltage mode e ae a e E aa ei 14 independent order ob eoe 14 operation E ER RECHNER GUN RAE TREIBER CR EUN MATE NETTE 14 performance ER t dt RU OU eU 14 prosramming REO TR EUER u pO OE UC E 13 CECI 25 SCIOWS cipere P CH ERU DRE CRUS QE PEN 71 transformer variablesvolfagel IU USGS SS AES 18 transient recovery tme 18 Index 159 Troubleshooting IO PC C EE 142 troubleshooting chart o tp tdheld high cere ate ce te ato 36 OV at t rnz0D teg e DUREE OP RO ta a er 36 secondary 36 Cere tie dee denied iden 36 SS 34 TST REO ERES E OR 34 UNREGULATED anmunc1ator ie ner IEEE E oe oleate a 55 using IDN query seien E EO ERU voltage maximum programm
54. power supply from service before removing the top cover Turn off the ac power and disconnect the line cord GPIB cable load leads and remote sense leads before attempting any disassembly Any disassembly work must only be performed by a qualified support technician Observe that the DC RAIL assembly LEDs DS420 amp DS421 are fully extinguished no live voltages present before attempting any disassembly work Any disassembly work must only be performed by a qualified support technician Cable connections are shown in Figure 6 2 of Chapter 6 and component part numbers are given in Chapter 5 Reassembly procedures are essentially the reverse of the corresponding disassembly procedures Tools Required b b b b b screwdriver size T 15 for most all retaining screws TORX screwdriver size T 20 for power supply carry straps Seven 7 mm metric hex driver to remove GPIB read connector Pencil paper and labels to make notes to aid in the reinstallation of components Work at a static free station such as a table covered with static dissipative laminate or with a conductive table mat Agilent P N 9300 0797 or equivalent using a conductive wrist strap where necessary such as Agilent P N 9300 0969 or 9300 0970 68 Troubleshooting Cover 1 Remove the four screws that secure the carrying straps two TORX 20 screws each side These same screws secure the cover to the chassis 2 Spread the bottom rea
55. uu sau L ipid dieto eer e bet o b eig d iuge 31 the Problem wz ask kaku Sa 31 Chapter Organization tbe estes 31 Test Equipment 32 Troubleshooting nu poe a a e oe tp e 32 Power On 32 km r ien in mete 32 Disabling The Power E SU Ere ope 32 Using the TST Query GPIB Systems Supplies Only 32 Proubleshooting Charts ven ror OR e E e ni o a ib Cur Pt 34 Troubleshooting Test Points ipie o n e iE PER b tuendo aed ge 34 Bias and Reference Supplies neon moe ERU e o vea eR e 34 CV CC Status Annunciators Troubleshooting sss 53 A3 FET Board Troubleshooting nene EE Uia o ere P ee t beet 53 Sienat re Analysls ete e boo oett iie et Sm o ei i 56 TIO GUC OM a iis ont o NE REUNIR 56 Firmware Revistofis s eerte QUE GENS SSS OE EQUI SEU 56 POSH Ad ers soc eim o oe t e EU C PER UN OR D 57 Post Repair
56. which supplies low voltage low power bias voltages where required Each block in Figure 4 3 identifies a schematic diagram in Chapter 6 where the circuits are shown in detail You can refer to the component location diagrams in Chapter 6 to locate specific components mentioned in this description Chapter 6 also has a cabling diagram showing the circuit board interconnections A2 GPIB Board Circuits the A2 GPIB board provide the interface between the GPIB controller and the power supply communications between the power supply and the GPIB controller are processed by the GPIB interface and primary microprocessor circuits on the A2 board The primary microprocessor circuits microprocessor U114 ROM U106 and RAM U108 decode and execute all instructions and control all data transfers between the GPIB controller and the Secondary Interface on the A10 Control Board The primary microprocessor also processes measurement and status data received from the Secondary Interface A UART universal asynchronous receive transmit IC U112 on the A2 board converts data between the primary microprocessor s 8 bit parallel bus and the serial I O port The serial data is transferred between the primary interface and the secondary interface via a programmed GAL gated array logic IC U119 and optical isolator ICs U110 U111 These ICs isolate the primary interface circuits referenced to earth ground from the secondary interface circuits reference
57. 0 320 Eprom data 6681 EEPROM data for 6681A DATA 463 75 8 19 0 83 0 6 333 70 592 0 DATA 98 3 22 16 17 75 10 0 0 83 255 20 10 DATA 6681 430 95 6 3645 92 128 5 255 0 0 DATA 1296 6681 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 002701 2 0017346 10 2286 390 Eprom data 6682 EEPROM data for 6682A DATA 175 74 21 5 0 83 0 15 73 246 0 DATA 98 21 8 7 10 26 3 0 83 255 20 10 DATA 6682 162 96 15 96 128 5 255 0 0 DATA 1296 6682 0 20 180 20 180 175 33 98 DATA 115 30 20 1 127 002701 2 000307 10 25 EPROM data for 6683A DATA 116 74 32 8 0 83 0 23 75 164 0 DATA 98 21 5 5 10 40 0 0 83 255 20 10 DATA 6683 108 96 23 97 128 5 255 0 0 DATA 1296 6683 0 20 180 20 180 175 33 98 Figure 3 17 Initialization and Factory Preset Replacement Program Listing Sheet 1 of 5 64 Troubleshooting 510 DATA 115 30 20 1 127 002701 2 00042 10 25 520 530 Eprom data 6684 EEPROM data for 6684A DATA 93 74 41 0 83 0 29 70 131 0 DATA 98 21 4 6 10 50 0 83 255 20 10 DATA 6684 87 97 28 93 128 5 255 0 0 DATA 1296 6684 0 20 180 20 180 175 33 98 DATA 115 30 20 1 127 002701 2 000333 10 234375 INPUT Input Power Supply model number Example 6681A Model CLEAR SCREEN RESTORE data FOR I 1 TO 49 READ NEXTI RESTORE Eprom data len FOR I 1 TO 49 READ Length 1 NEXTI SELECT TRIM UPC Model Delete leading trailing zeros and set to uppercase CASE 6680A RESTORE Eprom data 66
58. 0 4821 CAP 1200pF 100V 6683A 0160 4824 CAP 680pF 10V 6684A 0160 4808 CAP 470pF 10V C626 627 0180 4136 CAP 10uF 20V C628 0160 4835 CAP 10 50V C629 0160 4799 CAP 22pF C630 6680A 0160 4904 CAP 6800pF 5 6681A 0160 5410 CAP 3300pF 5 6682A 0160 4812 CAP 220pF 5 6683A 6684 0160 4810 CAP 330pF 5 C631 6680A 0160 5534 CAP 0 10 6681A 0160 5892 CAP 0 22uF 10 6682A 6683A 6684A 0160 5469 CAP luF 10 C632 633 0160 4791 CAP IOpF 5 100V C635 636 6680A 0160 5468 CAP 0 47uF 10 50V 6681A 0160 5469 CAP 10 50V 6682A 0160 5892 CAP 0 22uF 10 50V 6683A 6684 0160 5468 CAP 0 47uF 10 50V C637 6680A 6681A 0160 4808 CAP 470pF 5 6682A 6683A 6684A 0160 4812 CAP 220pF 5 106 Replaceable Parts Table 5 14 10 Control Assembly Replaceable Parts continued C639 0160 4795 CAP 4 7pF C640 0160 4835 CAP luF 10 50V C641 0160 5410 CAP 3300pF 5 C645 0160 4805 CAP 47pF 5 100V C648 0160 4831 CAP 4700pF 10 C650 0160 4833 CAP 022uF 10 C651 0160 7277 CAP 2 2uF 50V C652 0160 4832 CAP OluF 10 C653 0160 5892 CAP 0 22uF 10 C654 655 0160 4183 CAP 1000pF 20 C656 6680A 6681A 0160 5892 CAP 0 22uF 10 6682A 6683A 6684A 0160 5469 CAP 10 50 657 6680A 6681 not used 6682A 6683A 6684A 0160 5534 CAP 0 10 C658 659 0160 4183 CAP 1000pF 20 C710 711 0160 4835 CAP luF 10 50V C715 6680A 6681A not used 6682A 6683A 6684A 0160 4824 CAP 680pF 5 C735 0683 1005 RES 105 25W 0500 501 502 1901 0731
59. 000 0600 00000000 S IUD NO etsn In otsn ajo 0000000000 1 goon b 99 1000000 eee J se Noe Sue M k wu T O lxxi Z09n gosn b 1050 gt XI 0 _ 19900000 N n t259 5 C567 C505 0561 000000000 epi oan 9999 LSC 0S3 H 459 0 Teen 0 58 EIN ee 000000 90000000 n e e wn e gt e e e c51 ozon Biz 187 ozon eee 7299 000o A n n OE 61 89 54 6257 E C637 eeeeee A DURS TSP Figure 6 25 A10 Contiol Board Component and Test Point Location 509 146 1509 9 RESET J509 1 pud CIRCUITS YRSO0 J509 3 oi 50 T 15U BIAS OK R516 R517 287K 4 99K MAIN CONTACTOR CONTROL J509 2 J509 4 R509 ANN REA R506 10K 15V DETECT DES 10K 13 3K 14
60. 04 36 OUPU 50504 37 UF7P A5U504 38 347F A5U504 39 CP47 ASUS504 40 IC4C 6 After completing the tests be sure to return the J3 jumper to its original position Note After completing this test you can exit the SA mode only by performing a power on reset Troubleshooting 61 Post Repair Calibration When Required Calibration is required annually and also whenever certain components are replaced If components in any of the circuits listed below are replaced the supply must be recalibrated Note For calibration procedures see Appendix A of the Operating Manual Location Component A10 Control Board CV CC DACs operational amplifiers CV CC control circuit amplifiers readback DAC operational amplifier readback comparators Al Front Panel Assy 1 Front Panel Board or EEPROM AIU6 Note If either of these front panel components is replaced the power supply must first be reinitialized before calibration see EEPROM Initialization Inhibit Calibration Jumper If CAL DENIED appears on the display when front panel calibration is attempted or error code 1 occurs when GPIB calibration is attempted on a Systems Supply the INHIBIT CAL jumper see Figure 3 15 is installed This prevents the power supply calibration from being changed To calibrate the power supply first move this jumper from the INHIBIT CAL position to the NORM position Calibration Password In order to enter the calibration mode you must use the
61. 0502 3 8 CHECK 100505 NO NO CHECK A10U620 CHECK A10U502 Figure 3 5 Output Held Low Troubleshooting Sheet 2 of 2 Troubleshooting 43 START OUTPUT HELD HIGH TURN OFF THE SUPPLY AND REMOVE THE COVER AND RFI SHIELD DISCONNECT LOAD TURN SUPPLY ON AND CHECK THE BIAS AND REFERENCE VOLTAGES TEST POINTS 9 THROUGH 23 SEE TABLE 6 3 ARE TROUBLESHOOT THE DEFECTIVE CIRCUIT VOLTAGES OK DISABLE THE OV CIRCUIT BY LIFTING A10R536 TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO ZERO CHECK IF CV OR GATE DIODE 0652 15 CONDUCTING 100652 CHECK VOLTAGE READING ON FRONT PANEL CONDUCTING DISPLAY CHECK VOLTAGE LEVEL AT FAST SENSE DISPLAY READS FIULL SCALE CHECK VOLT DIFF AMP CIRCUIT A10U621 DIFF A10U608 7 VOLTAGE YES CHECK CV ERROR AMP CIRCUIT A10U621 CHECK A10U608 CHECK A1QU605 Figure 3 6 Output Held High Troubleshooting 44 Troubleshooting START DAC DEFECTIVE IF THE SUPPLY FAILS SELF TEST TURN OFF ONE OF THE CIRCUITS IS DEFECTIVE TURN OFF THE SUPPLY DEPRESS THE 7 KEY AND THEN SUPPLY AND REMOVE TOP COVER TURN ON SUPPLY AND CHECK BIAS AND REFERENCE VOLTAGES EST e WILE HOLONG THE REY DOWN POINTS 9 THOUGH 22 TABLE 6 30 50 AS TO SKIP SELF TEST SEE PAGE 3 2 ARE VOLTAGES TROUBLESHOOT THE DEFECTIVE CIRCUIT OK SHORT A10U506 1 SA MODE TO A10U506 20 SEE FIG 3 15 TURN ON SUPPLY AND WAIT 2 SECONDS THEN REMOVE SHORT WAIT FOR POWER ON INI
62. 0758 Heatsink U121 0535 0031 Nut hex w lockwasher J101 0515 0642 Screw U121 0515 0911 Screw M3x0 5 J101 Note All other parts are surface mounted and are not field repairable Table 5 7 A3 FET Assembly Replaceable Parts Ref Desig Agilent Part No ELECTRICAL PARTS C201 0160 7505 7uF 5 200V C202 0180 4132 CAP 6 8uF 35V C203 0160 4835 CAP 10 50V C204 205 0160 5098 CAP 22uF 10 C206 0180 4132 CAP 6 8uF 35V C207 208 209 0160 2006 100pF 10 210 211 213 214 0160 6838 2200pF IKV 215 216 0160 2006 100 10 217 0160 5098 CAP 22uF 10 C218 0160 4835 CAP 10 50V C219 0160 2006 CAP 100pF 10 C220 0180 4132 CAP 6 8uF 35V C221 0160 5098 CAP 22uF 10 C222 0180 4132 CAP 6 8uF 35V C226 0160 4791 CAP 10pF 5 100V C227 0160 4835 CAP 10 50V C228 0160 2301 2000pF 100V C229 0160 4918 CAP 022uF 50V C230 0160 4831 CAP 4700pF 10 C231 0160 2301 2000pF 100V C235 236 237 238 0160 4832 CAP OluF 10 C239 0160 4791 CAP 10pF 5 100V C240 0160 4832 CAP OluF 10 C242 243 0160 5098 CAP 22uF 10 Replaceable Parts 95 Table 5 7 FET Assembly Replaceable Parts continued 0160 6806 CAP luF 400V 0160 4832 CAP 0luF 10 0180 4132 CAP 6 8uF 35V 0160 7505 TuF 5 200V 0180 4132 CAP 6 8uF 35V 0160 4835 CAP luF 10 50V 0160 5098 CAP 22uF 10 0180 4132 CAP 6 8uF 35V C307 308 309 0160 2006 CAP 100 10 C310 311 313 314 0160 6838 CAP 2200pF IK
63. 09 LT1013 7900 901 1902 0960 DIO ZNR 12V 5 Q981 982 6680A 6681A 1855 0874 POWER MOSFET 6682A 6683A 6684 1855 1003 POWER MODFET 0340 1507 INSULATOR REF Q981 982 5080 23 16 CABLE Ref J910 to AIO CONTROL J510 not supplied as part of downprogrammer assy 104 Replaceable Parts Table 5 14 10 Control Assembly Replaceable Parts Ref Desig Agilent Part No ELECTRICAL PARTS C500 501 502 0180 4129 CAP luF 35V C503 0160 4835 CAP 10 50V 0180 4129 CAP luF 35V 0180 4131 CAP 4 7uF 35V 0160 4835 CAP 10 50V 0180 4136 CAP 10uF 20V 0160 4831 CAP 4700pF 10 0180 4129 CAP luF 35V 0160 5422 CAP 047uF 20 0160 5644 CAP 033uF 10 0160 4789 CAP 15 5 100V 514 515 0160 4805 47pF 5 100V C516 0160 5422 CAP 047uF 20 C517 0180 4129 CAP luF 35V C518 519 0160 4835 CAP luF 10 50V C520 0160 4822 CAP 1000 5 521 0160 4832 CAP OluF 10 C530 531 532 0160 5422 CAP 047uF 20 C533 534 534 0160 4801 CAP 100 5 C536 537 538 0160 5422 CAP 047uF 20 C539 0160 4846 CAP 1500pF 100V C540 541 542 543 0160 5469 C F 10 50 C544 0160 4835 CAP 10 50V C545 546 0160 4801 CAP 100 5 547 0180 2264 C F 3 3uF 15V C548 6680A 6681A 0160 4855 CAP 0 1uF 50V C556 560 0160 4835 CAP 10 50V C561 0160 4904 CAP 6800pF 5 C562 0160 4791 CAP IOpF 5 100V C563 564 0160 4835 CAP 10 50V C565 0160 4791 5 100V C566 0160 4795 CAP 4 7pF C567 0160 4904 CAP 6800pF 5 C56
64. 1 and E402 on the AC Input Board Remove the holding screw at the center of board just to the left of the 3 phase choke Disconnect phone cable going to J108 Slide the board to the right and lift out Other wires going to the board can now be removed unsoldered SD ps 5 RAIL Assembly Disconnect these cables from the following connectors at the A5 DC RAIL board 1 Disconnect the cables going to four connectors J430 7431 J432 and J433 2 Remove the four 4 holding screws TORX T 15 holding the A5 DC RAIL board in place 3 Lift the board out and remove desolder any other wires preventing the board from being removed A6 BIAS Assembly Disconnect the cables from the following connectors at the A6 BIAS Assembly board 1 Disconnect cables from connectors J809 J821 1830 and J831 on the A6 BIAS Board 2 Remove two 2 holding screws at top side of board 3 Slide board upward until board is free of slotted standoffs There is one of these standoffs at the top of the board and two at the bottom Wiggle the board slightly to clear all three standoffs then lift the board out 4 Once the board is free from its restraining standoffs you can proceed to remove unsolder any other wires cables as necessary to remove the A6 BIAS Board entirely Note It is recommended that you label any connectors you disconnect from the A6 BIAS Board to facilitate the reinstallation of these cables wires back to their correct locations
65. 13 D 7 22 22 000 11 001 18 D a 13 n D 15 DC 3 15 A10 Pp tt 5 005 A12 D 6 18 DQ6 A13 2 19 DQ A14 UCC VSS PCLR 50 11 0118 DS3658N C111 047 500 OUTA INB __CLAMPt V OUTa 10 INC OUTC 1 5 2 6 IND OUTD 8 CLRMP 28 ACD 24 AC 109 27 AC 119 3 A12 30 A13 81 AC 149 5 AC 15 21 10 293 11 2 R12 26 Ac 13 14 RI R135 R136 1 010149 9108 9112 042 042 047 047 500 500 500 500 1000PF 500 50 R107 R109 161035 464 1000 500 NC ISOLATION 0189 55 C133 SECONDARY R137 FPRX 100 FPTX PCLR AAW R134 R138 R105 10M 10 C128 200 2500 Figure 6 8 2 GPIB Board Schematic Diagram DF I GND DFI OUT 208 209 9 9204 e 239 268 D213 C211 O C344 O E206 O HHZRED O WH BLK T202 37
66. 155 Resistor 4 64K 1 R137 0757 0401 Resistor 100 Q 1 0 125W Backdating 151 Table 1 2 GPIB Parts List continued Ref Desig Agilent Part No Description ELECTRICAL PARTS 101 0360 2312 Terminal block digital control 0101 1826 0468 MC3423PI 0106 5080 2152 0108 1818 4111 6164655 0109 1820 6789 IC interface U110 111 1990 0444 IC Opto isolator 0112 1820 3210 68850 0113 1990 0543 IC Opto isolator 0114 1821 1479 MPU 0115 ILH4 0001 IC GP IB transceiver 0116 1820 2724 SN74ALS573BN 0117 1820 2549 8291A 0118 1820 4185 IC interface U119 5080 2153 IC GAL programmed GPIB U120 5080 2154 IC GAL programmed 0121 1820 0430 LM309K VRIO1 1902 0766 Diode zener 18 2V 5 102 1902 0959 Diode zener 11V 5 VR103 104 1902 0049 Diode zener 6 19V 5 W101 1258 0209 Jumper Y101 0410 2109 Crystal oscillator 12 000MHz MECHANICAL PARTS 1205 0758 Heatsink U121 0340 1277 Insulator 101 0535 0031 Nut hex w lockwasher 101 0515 0642 Screw U121 0515 0911 Screw M3x0 5 J101 1200 0567 Socket IC 28 pin U106 1200 0639 Socket IC 20 pin U119 120 1200 1274 Socket 01 14 152 Backdating 000000000000 990000009000 IB MEGT 9 9 000000 jooo0000000000000000 9012
67. 2 Figure 6 9 A3 FET Board Component and Test Point Location E302 RAIL RED D304 R331 R333 AAA NNV 75 5 ko ad 12 15V A 50 1 4 R303 R364 2 2 AAA HO 2 li TR 2 9 Slug UDD UB R301 R332 C317 C318 U302 DRIVE1A 0301 150 Sx 232 R304 10 HIN 200 1 44 255 5 FEN PRO FOR C302 lt 8 49 y Her 5 559 n T302 350 sp C309 C301 BOMH C316 75 0305 TR2110 5308 222 IR2110 500 SlUCC LIN 12 LIN UEC Pay 5009 DRIVEZA cs e nsus esee 0520 1 cs s mE L303 T 8 8 7 22 22 22 22 6 8 13 500 5 3 350 E USS 2 150 USS on 0302 L316 R328 R329 R309 R316 gt R31 cm ANN tho Lo AAA R310 i 150 150 1 pA 6 2 5x 5x 5x 1444 82 5 5 5 a s BRIDGE BRIDGE 1444 DRIUER DRIUER 0503 R345 a 2 C211 D321 5x 307 L308 opr Q352 E KO R362 R363 AA AAA 120 5 82 5 1 44 1 44 2 i RAIL i 01 E301 RAIL 2000 BLK n 0502 R337 IXFMR1A ANN DRIVE1A 215 51122 PWR 1 5M 5 T301 208 TZ04 14225 x J226 al O 12 13 14 L WH INPUT DRIVE 5
68. 25 Figure 3 20 3 Inch Front Panel Frame Assembly Troubleshooting 75 sqi uout 6 aans nbio 1 Joq ssnq u noj pasu aaya 99204 Z Sii3Sts 3oy20d02 40 dol 65 0060 XO TY ON DDV 832010 9 4657 0810 099 832010 9 9657 0810 VE999 59204 8 5197 0940 vZ999 6 9 2659 0010 91999 9 9157 0910 0899 597004 91 2000 0506 1014 gt 94 700 06 J USOM 5201 59204 91 20 0992 malS Z00 SESO IAN 7870 06 E6R0 0S0E 4 50 1014 697 0905 104 0705 0860 5150 MaS Figure 3 21 Assembly A10 Exploded View 76 Troubleshooting 841 100 Oj 6 26 Assy JUNUS 0 9 JOYSDM 207 M J3S tunys ON 4602 0805 VL899 9602 0806 0899 junus 9000 0Z Z inu uoupuiquo 000 050 J3USDM DIJ S0000 ZS990 1 20 4 punour 1000 090 Jayson 014 EE70 SISO 1461 0466 910 2642 0206 ax2oJg 010 0967 Sqi uou 05 512019 57801221 Joj3npur SHOQ 02 7 0 anb10 Figure 3 22 Assembly A10 Exploded View 6680A 6681A Troubleshooting 77 suJn moj paddDj junys ans axpu oj x2au2esinoq 882014 z 441 J USDM ujoo uobpJg 7262 0805 899 i aes 09 4 5 0068 0 7267 080
69. 25 00 8 99 Y div 9 09 Y 200 e div 15 00 4 89 V div 8 00 v 10 0 us div 30 00 u IG TEST POINT 50 0 ev div 0 00 V 2 06 V aiv 0 00 v 56 0 ns div 250 0 ne TEST POINT TEST POINT 57 Figure 6 1 Test Point Waveforms for Table 6 3 120 Diagrams ZV 121 4266 0906 2286 0908 HWX svig Ave 6 T3Nvd LNOH4 0622 erer 0805 9819 9227 Seer voor A18N3SSV 134 6 22 0805 ASNAS 15 List 1822 0809 8v ATaWASSY WVHdSOHdNAAOQ 9 35 MOIS 2120 0809 209 6V AT8N3SSV sm 13NVd INOH 8912 0805 ezzr 2063 1053 2063 1063 2063 9063 109 9063 609 9622 0809 18 9557 8822 0808 1622 0809 oa 6822 0806 9822 2622 0805 0809 7822 0808 5822 0805 y A18W3SSV 6822 0806 EAE 9v 0822 0805 9822 0809 103 003 A18N3SSV 1 0 096 3ONVH 8171 YO 566 08 0905 SHIM 2822 0808 8666 0804 4 63134 5955 8 AHO QH M Yala 13d 3MOHO INI iagram ing D t Board Cabli Ircul Figure 6 2 C Diagrams oo 99 oo eo Figure 6 3 A1 Front Panel Board Component and Test Point Location 122 Diagrams 50
70. 2U110 8 WITH RESPECT TO SECONDARY COMMON A2U110 5 12 CHECK CABLE W4 SEE FIG 6 4 CHECK 5V AT A2UMO 8 SECONDARY BIAS CIRCUIT TEST POINTS 20 21 AND 22 SEE TABLE 6 2 YES CHECK FOR SERIAL DATA PULSES AT THE A5 CONTROL BOARD CIRCUIT POINTS AS INDICATED BELOW WITH RESPECT TO SECONDARY COMMON 5 PULSES NO A10U506 107 CHECK 2 110 AND FOR CABLE W4 OPEN YES 5 2 Figure 3 11 Secondary Interface Down Sheet 1 of 2 50 Troubleshooting FROM SHEET PULSE CHECK SPCLR SIGNAL 100500 6 A10U504 1 AND FOR 2MHz CLOCK AT A100506 15 CHECK FOR SERIAL DATA PULSES AT THE A2 GPIB BOARO AT A2UITI 6 TEST POINT 6 WITH RESPECT TO PRIMARY GROUNO SEE TABLE 6 8 YES CHECK 2 19 CHECK 2011 CABLE W4 Figure 3 11 Secondary Interface Down Sheet 2 of 2 Troubleshooting 51 5 SLOW DOWN PROGRAMMING TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO 1 2 FULL SCALE MEN CHECK VOLTAGE LEVELS AT A10U609 1 AND A10U610 1 WITH RESPECT TO SECONDARY COMMON 36 SEE TABLE 6 3 CHECK FUSES ASF980 F981 BY MEASURING CONTINUITY A10U609 7 25V CHECK A10U609 CHECK A10U610 A10U609 1 lt 10V CHECK A10U609 A9R940 R941 SHOULD TOGGLE BETWEEN 1 V WITH OUTPUT HECK 100610 A90981 0982 AND APPROX 11 V WITH OUTPUT Figure 3 12 Slow Downprogramming Troubleshooting 52 Troubleshooting CV CC Stat
71. 3 12 Slow downprogramming circuit from Figure 3 1 Troubleshooting Test Points The troubleshooting charts reference test points listed in Table 6 3 of Chapter 6 Test points are identified by an encircled number such as in schematic diagrams and component location drawings also in Chapter 6 Bias and Reference Supplies Many of the following troubleshooting procedures begin by checking the bias and or reference voltages Table 6 3 lists the test points for these voltages and gives the correct reading for each The circuit board component location diagrams identify these points on each board 34 Troubleshooting ae s START OVERALL TROUBLESHOOTING zu 1 YES DID YOU DO TROUBLE SHOOTING IN NO PERFORM CHECKS OPERATING MANUALS PAGE 3 5 IN OPERATING MANUAL l TURN OFF SUPPLY AND REMOVE THE TOP COVER AND RFI SHIELD CISCONNECT LOAD AND CONNECT SENSE TERMINALS FOR LOCAL SENSING TURN ON SUPPLY AND CHECK FOR ANY INDICATION FAN RUNNING DISPLAY ON DC RAIL LED 05420 0 421 ON THAT AC POWER I ON YES i AC POWER ON CHECK INPUT LINE FILTER 24 AUX BIAS ON 420 5 4 151 i i GO TO NO DISPLAY TROUBLESHOOTING FIG 3 2 ee YES p c 2 gt SEE SELF TEST ERROR CODES MESSAGES TABLE 3 2 NO USING FRONT PANEL KEYS PROGRAM FULL SCALE VOLTAGE AND CURRENT SEE TABLE 2 2 AND USE TO MEASURE VOLTAGE AT SUPPLY S OUTPUT TERMINALS
72. 5 121 0160 5422 Capacitor 0 047 20 C122 0180 3325 Capacitor 25V C123 0160 4822 Capacitor 1000pF 5 C124 0180 0228 Capacitor 22 15 C125 0160 5422 Capacitor 0 047 20 C126 127 0160 4807 Capacitor 33pF 5 100V C128 0160 4281 Capacitor 2200pF 20 C129 134 0160 5422 Capacitor 0 047 20 C135 0180 0228 Capacitor 22 15 C136 0160 4803 Capacitor 68pF 5 100V C138 140 0160 5422 Capacitor 0 047 20 D107 110 1901 0731 Diode power rectifier D111 114 1901 1098 Diode 1N4150 D115 116 1901 1080 Diode 1N5817 D119 120 1902 0766 Diode zener 18 2V 5 F101 2110 0699 Fuse subminature 5AM 125V J101 1252 0268 Connector receptacle GPIB J106 1251 4926 Connector receptacle test header J107 108 114 115 1251 7330 Connector receptacle phone L101 9100 1610 Inductor 150nH 20 P101 1251 4245 Connector plug 2 pin ac bias Q101 1853 0089 Transistor PNP 2N4917 R103 0757 0442 Resistor 10K 1 0 125W R104 0698 3155 Resistor 4 64K 1 R105 0683 1065 Resistor 10M 5 0 25 W R106 0698 4037 Resistor 46 4 Q 1 R107 0698 0082 Resistor 464 Q 1 0 125W R108 0757 0401 Resistor 100 Q 1 0 125W R109 0698 0082 Resistor 464 Q 1 0 125W R111 114 0698 3155 Resistor 4 64K 1 R115 117 0698 4037 Resistor 46 4 1 R118 0757 0280 Resistor 1 0 125 R119 0698 8827 Resistor 1M 1 0 125W R120 122 0698 3155 Resistor 4 64K 1 R123 0698 0082 Resistor 464 Q 1 0 125W R130 133 0698 3155 Resistor 4 64K 1 R134 0683 1015 Resistor 100 Q 5 0 25W R135 136 0698 3
73. 5809 5 000000000 90 ooooooooooo 000000000 Figure A 1 A2 GPIB Component Parts List Backdating 153 Index A A Front Panel Board test header 57 A2 GPIB Board testheaders cnt e dolendi ete tee etait educa detis A 57 A3 FET Board dynainic 55 Static troubleshooting E ab SESE 55 test connections m asses e 55 e i 55 56 AN E Pose Mal ts a f E 8 Agilent 50504A 2 2 21 02002200 0 00400000000000000000000000000000 0 ASS 34 Agilent 545A logic probes sese asha 34 B bias supply ze E ERG ER CHR T 36 C cable WS ribbon Da ERR E q 79 ete tite e de e e 79 WSs phone eee ne ete e e ee tede eee e 79 W6 ae eet aed oir ep rd p HO 79 Cabling diagram esee e eee tei 146 calibration constants factory ees cedet reete edis ice ee esi A 66 calibration password ce wd Ree he are e RTI der e ee a EH e fe Pes 65 calibration postsrepalr ice o RI dde ident
74. 6 vt999 70008 28990 2899 ssnq S 3 20Jq XOIV ON PPY V78 E899 uo db ON 00160 109 SDJDMO M 2019 59 0 OE andoj Figure 3 23 Assembly A10 Exploded View 6682A 6683A 6684A 78 Troubleshooting 5080 2262 30 9 QO GJ ooodqe ENO VIEW OF CONNECTOR SCALE 2X Nut 0535 0023 Lockwasher 2190 0586 Flatwasher 3050 1053 Subchassis 5001 6780 Figure 3 24 Three Phase Line Choke Subchassis Wiring Troubleshooting 79 VIEW CONNECTOR Screw 0515 0964 Lockwasher 2190 0586 Flatwasher 3050 1053 Shoulder washer 0340 0655 24V Fan Transformer Chassis 5001 6780 Figure 3 25 24 Volt Fan Transformer 80 Troubleshooting Principles Of Operation Introduction Figure 4 3 at the end of this chapter is a block diagram showing the major circuits within the power supply The power supply consists of the following circuits Front Panel Board ckts e 2 GPIB ckts A10 Control Board including the secondary interface ckts CV CC control ckts switching downprogramming control ckts Power circuits on the A4 AC Input Board A3 FET Assembly ckts 5 DC Rail Board ckts Output bus circuits which include the A7 Snubber Board A8 Slow Sense Board and A9 Downprogrammer Board ckts Output rectifiers and filter capacitors e Ferrite cores mounted on the output bus form the output filter inductors Bias Board supply
75. 6 9170 1454 CORE SHLD BEAD Q201 202 203 204 1855 0859 MOSFET 500V 20A Q211 222 233 244 1855 0859 MOSFET 500V 20A Q251 252 253 254 1853 0363 D45H5 D45H8 363 OQ QQQ Q 96 Replaceable Parts Table 5 7 FET Assembly Replaceable Parts continued Q301 302 303 304 1855 0859 MOSFET 500V 20A Q311 322 333 344 1855 0859 MOSFET 500V 20A Q351 352 353 354 1853 0363 D45H5 D45H8 363 0811 3903 RES 150 Ohm 5W NI 0699 0208 RES 1 596 25W CF 0683 5615 RES 560 5 25W 0683 0625 RES 6 2 5 25W 0683 7505 RES 75 5 25W 0683 0335 RES 3 3 5 25W 0683 3305 RES 33 5 25W 0683 0625 RES 6 2 596 25W 0683 8205 RES 82 5 25W R211 212 0683 1535 RES 15K 5 25W R213 214 216 217 0811 3903 RES 150 Ohm 5W NI R220 221 0811 3903 RES 150 Ohm 5W NI R222 0811 2556 RES 1 25 1 4W R224 225 0811 3903 RES 150 Ohm 5W NI R226 0683 1535 RES 15K 5 25W R227 0698 3159 RES 26 1K 1 R228 0683 8205 RES 82 5 25W R229 0683 0625 RES 6 2 5 25W R230 0683 3305 RES 33 5 25W R231 0683 7505 RES 75 5 25W R232 0683 0335 RES 3 3 5 25W R233 0683 0625 RES 6 2 5 25W R237 0757 0437 RES 4 75K 1 R238 0757 0280 RES IK 1 125W R239 0757 0437 RES 4 75K 1 R240 0757 0280 RES IK 1 125W R241 242 0757 0437 RES 4 75K 1 R243 0683 1535 RES 15K 5 25W R244 0698 4457 RES 576 1 125W R245 0683 1015 RES 100 5 25W R246 0683 1555 RES 1 5M 5 25W R247 0757 0462 RES 75K 1 R248 0698 3159 RES 26 1K 1 R249 0757 0444 RES 13 1K 1 R250 0698 3572 RE
76. 681A POWER SUPPLY 06682 60023 FAST SENSE PC ASSEMBLY Ref 6682A POWER SUPPLY 06683 60023 FAST SENSE PC ASSEMBLY Ref 6683A POWER SUPPLY Ref 6681A POWER SUPPLY 06684 60023 FAST SENSE PC ASSEMBLY Ref 6684A POWER SUPPLY 0160 5468 CAP 0 47uF 50V MECHANICAL PARTS 5080 2287 CABLE Ref 1001 1003 to CONTROL 1512 Replaceable Parts 103 Table 5 13 9 Down Programmer Slow Sense Replaceable Parts Ref Desig Agilent Part No ELECTRICAL PARTS C950 951 0160 4259 CAP 22uF 10 C952 953 0160 4048 CAP 022uF 2096 C956 957 0160 4065 CAP 20 C958 980 0160 4835 CAP 10 50V D980 981 1901 1098 DIO IN4150 F980 981 6680A 6681A 2110 0697 FU SUBMIN 15A 6682A 6683A 6684A 2110 0916 FU SUBMIN 7A Q980 1853 0510 XSTR PNP R940 6680A 6681A 0811 3705 RES 01 3W 6682A 6683A 0811 3691 RES 025 3W 6684A 0699 1060 RES 05 3W R941 6680A 6681A 0811 3705 RES 01 3W 6682A 0811 3691 RES 025 3W 6683A 6684A 0699 1060 RES 05 3W R945 946 6680A 0698 3609 RES 22 5 2W MO 6681A 0698 3614 RES 43 5 2W MO 6682A 0698 3633 RES 390 5 2W MO 6683A 0698 3637 RES 820 5 2W MO 6684A 0698 3338 RES 1 5K 5 2W MO R950 951 952 953 0683 5605 RES 56 5 25W R954 955 958 959 0699 0208 RES 15 25W CF R960 0683 2755 RES 2 7M 596 25W R961 not used R980 0757 0451 RES 24 3K 1 R981 0698 4416 RES 169 1 125W R982 0757 0273 RES 3 01K 1 R983 984 0698 0082 RES 464 1 125W U900 6680A 6681A 1826 0890 IC 358A 6682A 6683A 6684A 1826 14
77. 7 0437 RES 4 75K 1 R338 C757 0280 RES IK 1 125W R339 0757 0437 RES 4 75K 1 R340 0757 0280 RES IK 1 125W R341 342 0757 0437 RES 4 75K 1 R343 0683 1535 RES 15K 5 25W R354 0757 0442 RES 10K 1 125W R355 0698 3136 RES 17 8K 1 R356 357 0757 0382 RES 16 21 R360 361 0683 8205 RES 82 5 25W R362 0683 1215 RES 120 5 25W R363 364 365 0683 8205 RES 82 5 25W R366 0683 1215 RES 120 5 25W R367 0683 8205 RES 82 5 25W R368 0698 3572 RES 60 4K 196 R369 0698 4121 RES 11 3K 1 R370 0757 0440 RES 7 5K 1 R371 0757 0200 RES 5 62K 1 R372 0757 0442 RES 10K 1 125W R373 374 375 0757 0437 RES 4 75K 1 R377 0698 3633 RES 390 5 2W MO R378 0757 0274 RES 1 21K 1 R379 0683 1005 RES 10 5 25W R380 0757 0437 RES 4 75K 1 R381 0698 0085 RES 2 61K 1 R382 0683 1015 RES 100 5 25W 98 Replaceable Parts R383 R384 385 T202 T204 T205 T302 T304 U201 202 U203 U204 U205 U301 302 U303 U304 U305 Z201 301 C420 C428 429 430 J417 418 J419 J420 K401 K402 400 405 R407 408 R435 436 437 Table 5 7 A3 FET Assembly Replaceable Parts continued Ref Desig Agilent Part No 0757 0442 8159 0005 9100 4350 06624 80091 5080 2238 9100 4350 06624 80091 1820 8433 1826 1343 1826 0138 1826 1475 1820 8433 1826 1343 1826 0412 1990 0996 1902 1377 RES 10K 1 125W RES ZERO OHMS XFMR CURRENT XFMR PULSE XFMR CUR SHARING XFMR CURRENT XFMR PULSE PWM LC IR2110 IC VOLTAGE REG TL431CP IC COMPARAT
78. 7554 Tou 270mA Tour 20mA Tour 20mA 85mA Tou 110mA 160 245A Tour 270mA Tout 20mA Tout 20mA Enter your test results in this column 28 Verification Table 2 7 Performance Test Record for Agilent Model 6684A MODEL Agilent Report No Test Description Maximum 222227 GP Constant l u uz ee Tests Voltage Programming and Readback Low Voltage OV Vou 40mV 40mV Front Panel Display Readback Vout 60mV Vout High Voltage 40V Vout 39 944V 40 056V Front Panel Display Readback Vout 80mV Vout 80mV Load Effect Vout 2 3mV Vout 2 3mV Source Effect Vout 2 3mV Vout 2 3mV PARD Ripple and Noise Peak to Peak RMS Transient Response Time at 900 us Constant Current Tests Current Programming and Readback Low Current OA Lu 65mA 65mA Front Panel Display Readback Tout 9OMA Tour 90mA High Current 128A Iou 127 807A 128 193A Front Panel Display Readback 218mA La 218mA Load Effect 15 4mA La 15 4mA Source Effect La 15 4mA La 15 4mA Enter your test results in this column Verification 29 Troubleshooting Shock Hazard Most of the procedures in this chapter must be performed with power applied and protective covers removed These procedures should be done only by trained service personnel aware of the hazard from electrical shock CAUTION This instrument uses components that can be damaged or suffer serious performance degradation due to ESD ele
79. 8 569 0160 4787 C F 22pF 5 100V C570 0160 4795 CAP 4 7pF C571 0180 4129 CAP luF 35V C572 0180 4131 CAP 4 7uF 35V C573 0160 4835 CAP 10 50V C574 0160 4805 CAP 47pF 5 100V C575 576 0160 5098 CAP 22uF 10 C577 578 0160 4824 680pF 100 C579 580 0160 4835 CAP luF 10 50V 0160 4797 CAP 3 3pF 0160 4807 CAP 33pF 5 100V 0160 4797 CAP 3 3pF 0160 4834 CAP 047uF 10 0160 4835 CAP 10 50V 0160 4814 CAP 150pF 5 0160 4801 CAP 100 5 6682A 683A 6684A 0160 4813 CAP 180pF 5 Replaceable Parts 105 Table 5 14 10 Control Assembly Replaceable Parts continued C588 0160 4799 CAP 2 2pF 5 C589 590 6680A 6681A not used 6682A 6683A 6684A 0160 4824 CAP 680 5 591 6680 0160 4814 150 5 6681A 0160 4801 100 5 6682A 683A 6684A 0160 4813 CAP 180pF 5 C592 0160 4835 CAP luF 10 50V C594 0160 4799 CAP 2 2pF C595 0160 5098 CAP 22uF 10 C596 6680A 6681A 0160 4811 CAP 270pF 5 6682A 683A 6684A 0160 4831 CAP 4700pF 5 0160 4795 CAP 4 7pF 6680A 6681A 0160 4831 CAP 4700pF 10 6682A 6683A 0160 4830 CAP 2200pF 10 6684A 0160 4831 CAP 4700pF 10 C599 600 601 0160 4835 CAP 10 50V C621 0160 4795 CAP 4 7pF C622 0160 5534 CAP 0 10 63V C624 6680A 0160 5267 CAP 4700pF 5 6681A 0160 5410 CAP 3300pF 5 6682A 0160 4904 6800pF 5 6683A 6684 0160 5267 4700 5 625 6680 0160 4819 2200 100 6681A 0160 4846 CAP 1500pF 100V 6682A 016
80. 8 3279 RES 4 99K 1 R520 0757 0442 RES 10K 1 125W R521 0757 0465 RES 100K 1 R522 0757 0289 RES 13 3K 1 R523 524 0757 0280 RES IK 1 125W R525 526 0757 0442 RES 10K 1 125W R527 0699 1212 RES 19K 1 R528 0698 6392 RES 22K 1 125W R529 0757 0283 RES 2K 1 125W R530 1810 0305 NETWORK RES SIP R531 0698 4446 RES 267 1 125W R532 0757 0273 RES 3 01K 1 R533 0698 3155 RES 4 64K 1 R534 0699 0070 RES 3 16M 1 R535 0757 0468 RES 130K 1 R536 6680A 0757 0290 RES 6 19K 1 125W 6681A 0757 0442 RES 10K 1 125W 6682A 0698 4486 RES 24 9K 1 6683A 0698 6076 RES 39K 1 6684 0757 0457 RES 47 5K 1 R537 6680A 8159 0005 RES 0 0 6681A 0698 8827 RES IM 1 6682A 6683A 0699 0070 RES 3 16M 1 6684A not used R538 6680A 6681A 0698 8827 RES IM 1 6682A 0699 1972 RES 1 74M 1 6683A 0699 0070 RES 3 16K R539 0757 0438 RES 5 11K 1 R540 0757 0428 RES 1 62K 1 R550 551 552 0757 0401 RES 100 1 125W R553 554 0757 0465 RES 100K 1 R555 0757 0462 RES 75K 1 125W R556 0698 3450 RES 42 2K 1 R557 0757 0280 RES IK 1 125W R558 559 0698 3456 RES 287K 1 R560 561 562 563 0698 4486 RES 24 9K 1 R564 565 566 567 0699 0642 RES 10K 1 IW R568 569 0698 3279 RES 4 99K 1 108 Replaceable Parts 570 580 R581 R582 583 R584 R585 R586 R587 R588 589 R590 R591 592 R593 R594 R595 R596 R597 R598 R599 600 R601 602 R603 R604 R605 606 R607 R608 609 R610 6680A 6681A 6682A 6683A 6684
81. 80 CASE 6681A RESTORE Eprom data 6681 CASE 6682A RESTORE Eprom data 6682 CASE 6683A RESTORE Eprom data 6683 CASE 6684A RESTORE Eprom data 6684 CASE ELSE PRINT Model number not found Program is for models PRINT Agilent 6680A 6681A 6682A 6683A and 6684A only STOP END SELECT FOR I 1 7049 Read model dependent data READ Init_data 1 NEXT I OUTPUT Ps CLS Clears power supply registers OUTPUT Ps CAL STATE ON Turn on cal mode 0 passcode Figure 3 17 Initialization and Factory Preset Replacement Program Listing Sheet 2 of 5 Troubleshooting 65 1020 GOSUB Ps error Error if passcode is not 0 1030 IF Err THEN 1040 OUTPUT Ps IDN Get data from model location 1050 ENTER Ps Idn 1060 Model V AL Idn POS Idn 1 1070 ELSE 1080 GOTO Start 1090 ENDIF 1100 1110 OUTPUT Ps CAL STATE Model Turn on cal mode passcode 1120 data at model number location 1130 1140 GOSUB Ps error Error if passcode is not same as 1150 data at model location 1160 IF Err THEN 1170 OUTPUT Ps CAL STATE ON Model 1 4 Turn on cal mode passcode 1180 model 1190 GOSUB Ps error 1200 IF Err THEN 1210 PRINT Change pass code to the power supply model or zero then restart the program 1220 STOP 1230 ELSE 1240 GOTO Start 1250 END IF 1260 ENDIF 1270 1280 Start 1290 1300 1310 INPUT Select Initialization I or Factory preset repla
82. 876 LR828 LR827 HP IB BOARD 257 Ross REO R933 C844 10 10 10 10 10 s ILI E gt 1744 sx 5x 5x 5x 5x 5x 5x 5x 5x 3541 1 44 1 44 1 44 1744 1744 1 44 D110 0109 FEE 0128 4 Y leoi 10000 25V 30x 10x D107 D108 F101 24 50 5A ZN 4 24 50 FAN DETECT gt 0808 9 FAN DETECT 150K 5x 13 4 LOW FAIL 1744 UN b tA gt 2 50 2003A 2 16 R865 NY 90 9K w Figure 6 16 A6 Bias Board Schematic Diagram Sheet 2 of 2 ez fess C93 C957 pogo A3 5 4 C951 P O SLOW SENSE 02 EWOO ne 1910 9 P O FAST pid SENSE j J904 DPS 2 DPS lt 9 5 SENSE SENJ 906 SENE J910 8 DP CONTROL J910 7 143 N 0980 D981 R983 N 0 0981 C980 Figure 6 17 Power Mesh Schematic Diagram Models 6680A 6681A Only C920 WM P O SNUBBER mee P s a 2 Ms D R960 C951 E1001 1002 R952 12 3 7900 P L900 p P O SLOW SENSE J910 9 SHUNT J910 1 COMMON P O FAST SENSE 4910 1 40 5 J9eto 2 DPS 90 5 SENSE J912 GEN so 6 _ 1 SENSE J910 8 DP CONTROL 1901 J910 7 414 3V T901 N D980 ees N 0981 Figure 6 18 Power Mesh Schematic Diagram Mod
83. A R611 R612 R613 R614 R615 R616 R617 R618 R619 R620 6680A 6681A 6682A 6683A 6684A R621 6680A 6681A 6682A 6683A 6684A R622 6680A 6681A 6682A 6683A 6684A R623 6680A 6681A 6682A 6683A 6684A Table 5 14 A10 Control Assembly Replaceable Parts continued Ref Desig Agilent Part No 0757 0424 0757 0407 0698 4486 0757 0472 0757 0434 0757 0472 0757 0407 0757 0442 0699 0070 0757 0472 0699 0070 0757 0280 0757 0273 0757 0442 0757 0199 0757 0273 0757 0427 0757 0401 0698 4446 0698 3279 0698 3430 0698 4479 0757 0429 0757 0462 0757 0465 0757 0465 0698 3450 0757 0442 0698 3155 0698 3279 0698 3162 0757 0410 0698 0082 0757 0410 0757 0453 not used 0698 3136 0757 0446 0757 0453 0757 0462 0757 0467 0757 0469 not used 0698 3136 0757 0446 0757 0453 0757 0462 0757 0467 0757 0469 RES LIK 1 RES 200 1 125W RES 24 9K 1 RES 200K 1 RES 3 65K 1 RES 200K 1 RES 200 1 125W RES 10K 1 125W RES 3 16M 1 RES 200K 1 RES 3 16M 1 RES 1 125W RES 3 01K 1 RES 10K 1 125W RES 21 5K 1 RES 3 01K 1 RES 1 5K 1 RES 100 1 125W RES 267 1 125W RES 4 99K 1 RES 21 5 1 RES 14K 1 125W RES 1 82K 1 RES 75K 1 RES 100K 1 RES 100K 1 RES 42 2K 1 RES 10K 1 125W RES 4 64K 1 RES 4 99K 1 RES 46 4K 1 RES 301 1 125W RES 464 1 125W RES 301 1 125W RES 30 1K 1 RES 17 8K 1 RES 15K 1 RES 30 1K 1 RES 75K 1 RES 121K 1 RES 150
84. A 6684A T900 901 6680A 6681A 6682A 6683A 6684A 0180 4516 0180 4532 0180 4615 0180 4596 0180 4597 0160 4183 1906 0396 1906 0397 1906 0398 1906 0396 1906 0397 1906 0398 1906 0396 06681 80001 06681 80004 06681 80005 06681 80006 5080 2257 9170 1571 1855 0834 5080 2296 5080 2297 06682 80002 5080 2324 5080 2324 9100 5042 9100 5043 9100 5086 9100 5085 9100 5076 Table 5 3 Main Chassis Replaceable Parts Ref Desig Agilent Part No CAP 33000uF 7 5V CAP 22000uF 16V CAP 18000uF 28V CAP 13000uF 45V CAP 7 200uF 55V CAP 1000pF 250V SHOTTY RECTIFIER SHOTTY RECTIFIER SHOTTY RECTIFIER SHOTTY RECTIFIER SHOTTY RECTIFIER SHOTTY RECTIFIER SHOTTY RECTIFIER CHOKE OUTPUT CHOKE OUTPUT CHOKE OUTPUT CHOKE OUTPUT CORE CORE POWER MOSFET SHUNT CURRENT SHUNT CURRENT SHUNT CURRENT SHUNT CURRENT SHUNT CURRENT POWER TRANSFORMER POWER TRANSFORMER POWER TRANSFORMER POWER TRANSFORMER POWER TRANSFORMER MECHANICAL PARTS 06652 00005 06680 20001 06680 20002 06680 80003 06681 80003 06682 80001 06683 80001 06684 80001 5185 1343 1252 1488 1252 3698 BUS BAR BUSS BAR BLOCK BUSS FET BLOCK NAMEPLATE front panel model description NAMEPLATE front panel model description NAMEPLATE front panel model description NAMEPLATE front panel model description NAMEPLATE front panel model description CABLE ac line switch to bias board TERM BLK 4 POS CONNECTOR Replaceable
85. ASSY 5060 3540 TESTED FET ASSY 5060 3543 TESTED AC INPUT BOARD ASSY 5060 3544 TESTED DC RAIL BOARD ASSY 5060 3541 TESTED BIAS PC ASSY 06680 60021 SNUBBER PCB ASSY 06681 60021 SNUBBER PCB ASSY 06682 60021 SNUBBER PCB ASSY 06683 60021 SNUBBER PCB ASSY 06684 60021 SNUBBER PCB ASSY FAST SENSE PCB 06680 60022 DOWN PROGRAMMER SLOW SENSE PC 06681 60022 DOWN PROGRAMMER SLOW SENSE PC 06682 60022 DOWN PROGRAMMER SLOW SENSE PC 06683 60022 DOWN PROGRAMMER SLOW SENSE PC 06684 60022 DOWN PROGRAMMER SLOW SENSE PC 06680 61020 TESTED CONTROL PCB ASSY 06681 61020 TESTED CONTROL PCB ASSY 06682 61020 TESTED CONTROL PCB ASSY 06683 61020 TESTED CONTROL PCB ASSY 06684 61020 TESTED CONTROL PCB ASSY ELECTRICAL PARTS 0180 4369 C F 1500uF 400V 0180 4516 CAP 33000uF 7 5V 0180 4532 CAP 22000uF 16V 0180 4615 CAP 18000uF 28V C901 902 903 904 905 6680A 0180 4516 CAP 33000uF 7 5V 6681A 0180 4532 CAP 22000uF 16V 6682A 0180 4615 CAP 18000uF 28V 6683A 0180 4596 CAP 13000uF 45V 6684A 0180 4597 7 200uF 55 C906 6680A 0180 4516 CAP 33000uF 7 5V 6681A 0180 4532 CAP 22000uF 16V 90 Replaceable Parts C907 6680A 6681A 6682A 6683A 6684A C920 921 922 923 924 925 6682A 6683A 6684A D900 6680A 6681A D900A B 6682A 6683A 6684A D901 6680A 6681A D901A B 6682A 6683A 6684 D902 903 6680A 6681A L900 901 6680A 6681A 6682A 6683A 6684A L902 903 L904 905 906 0981 982 R900 6680A 6681A 6682A 6683
86. Board Component and Test Point Location 24 50 UNREG 24 5U J816 sele Hselo J816 1 lt DEW INDICATE F800 R818 1816 2 4A 1744 TIP122 5 R817 SE 22 4 13 90 ANN 1 FROM DC 0800 0801 10K p RAIL 4816 36 C800 90 INC 0850 D R819 110851 19 1000 C801 9812 49 22 D802 D803 8 Ax 35U 1800 65 1210 4 7816 MC10 LM324 i 1 2 w eau 1 1801 4 1 C805 FROM DC 2 mum RAIL BD 1047 IHSUB01 3 a 0801 LM317T E802 EJ 0 150 BIAS A 4 i R804 aoma J830 5805 Tr Ne 0804 5 080 196 FET BD e 5 11 C806 R873 C807 C808 C810 i 134 E804 e 1906 5 1 1000 6 2 D806 7ND807 509 1 0UF C809 35U Ne 25 J820 2 50 4809 135 ma secondary gt J809 1 R812 150 SECONDARY IHSB03 AAA J809 5 5 135MA US r 0 SA SECONDARY oe m D808 5 LM317T_ gt AD P I 2 3 4 CONTROL BD CONNECTOR J809 8 6 LM337T 15V SECONDARY 85MA RAIL DELAY gt 2 FAN PWM R879 C gt J809 16 AAA 0 C826 15U BIAS B 047 1000 PRIMARY 4851 FET BD J831 1 gt J831 2 Figure 6 16 6
87. CHING ON THE INSTRUMENT the protective earth terminal of the instrument must be connected to the protective conductor of the mains power cord The mains plug shall be inserted only in an outlet socket that is provided with a protective earth contact This protective action must not be negated by the use of an extension cord power cable that is without a protective conductor grounding Grounding one conductor of a two conductor outlet is not sufficient protection If this instrument is to be energized via an auto transformer for voltage change make sure the common terminal is connected to the earth terminal of the power source Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting of the protective earth terminal will cause a potential shock hazard that could result in personal injury Whenever it is likely that the protective earth connection has been impaired this instrument must be made inoperative and be secured against any unintended operation Only fuses with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuseholders To do so could cause a shock or fire hazard Do not operate this instrument in the presence of flammable gases or fumes Do not install substitute parts or perform any unauthorized modification to this instrument Some procedures described in this manual are performed w
88. D UB 1 44 R201 SW yi e 1 1 R222 1 1 1 44 82 sx C237 DRIVE1B 2 1 25 R384 2 1 44 Reza 217 9505 Ceee 90 46 R269 lt 270 202 9201 150 5x 1 o1 lt 33 11 3K 2 5 SW 24 NN 10 176 8 R275 10 100 2z HIN 6 8 HIN RU200 0 500 0 1 50 1 44 500 4 75 ALT C201 SNR us U204 12 AA 11 202 11 1 SD SD 5 62K 202 R208 C209 C201 80MH C216 R230 A D205 6 IR2110 Em 1 Tm mS 1N4936 I 7 DRIVE eB 3 C240 12 5000 200u 5000 UCC LIN DRIVE1B R272 ZX YR201 LIN UCC C219 01 10K 6 190 RM IXFMR1B IXFMR2B L215 C220 21 C243 100 ex DRIVE2B L203 100PF T 9 9 Te 722 T 0203 0233 e MET a A USS COM C211 D D COM USS IQ 12 4 1216 R228 R229 j 1 2200PF E 5 Lo R210 i f 5 3 E eb x 6 2 5x 1 44 1 44 82 5 3 3 BRIDGE BRIDGE 1 5 R216 R217 R224 5 R225 DRIVER D203 150 150 150 150 DRIVER 5x 5x 5x 5x 5 5 SW EN 150 g gt i D221 L207 L208 L211 L212 120 5 TO HEAT SINK 0814 1744 M4 PL Q252 1 i 1 HP100 R262 R2653 1 T2200PF AA 1KU C238 5x 120 5x 82 5x Bait 1 44 17 44 0256 1 44 2 4 4 01 15 E206 WH RED 01 E201 RAIL 1000 Rese ue D224 1 8 5 E207 O Y WH BLK R246 AN 50 1 5 5 D213 C346 R247 R255 20PF 1 21K 1500 IXFMR1B 0226 eS ad OPTO L UN GuarD apres 1000 1 UNLESS OTHERWISE SPECIFIED R227 ALL RESISTOR VALUES ARE IN OHMS 1
89. DIO PWR RECT D503 504 505 506 507 508 1901 1098 DIO 1N4150 D530 531 532 533 534 535 1901 1098 DIO 1N4150 D536 538 1901 1098 DIO 1N4150 D539 1901 0880 DIO GEN PRP D540 1901 1098 DIO 1N4150 0560 561 1901 0880 DIO GEN PRP D637 1901 1098 DIO 1N4150 D651 652 1901 1098 DIO 1N4150 D653 654 1901 0880 DIO GEN PRP D655 656 1901 1098 DIO 1N4150 D657 1901 0880 DIO GEN PRP D658 659 1901 1098 DIO IN4150 D670 1901 0880 DIO GEN PRP D671 1901 1098 DIO IN4150 D672 673 674 675 676 1901 0880 DIO GEN PRP D677 678 679 680 1901 1098 DIO 1N4150 J507 1251 7330 PHONE RECEPTABLE J509 1252 1992 CONNECTOR 16 pin J510 1252 1152 CONNECTOR 10 pin J511 1252 0055 CONNECTOR 2 pin J512 1252 0056 CONNECTOR 4 pin J513 1252 3693 CONNECTOR 7 pin L500 9140 0158 COIL IUH 10 Q610 1853 0510 XSTR PNP Q621 622 623 1855 0413 J FET P CHAN R500 0757 0346 RES 10 1 125W R501 502 0698 3155 RES 4 64K 1 R503 0757 0273 RES 3 01K 1 R504 0757 0442 RES 10K 1 125W R505 0757 0434 RES 3 65K 1 Replaceable Parts 107 Table 5 14 10 Control Assembly Replaceable Parts continued R506 0757 0289 RES 13 3K 1 R507 0698 3155 RES 4 64K 1 R508 0698 6323 RES 100 1 R509 0757 0442 RES 10K 1 125W R510 0757 0289 RES 13 3K 1 R511 0698 3155 RES 4 64K 1 R512 0757 0472 RES 200K 1 R513 0757 0199 RES 21 5K 1 R514 0698 3279 RES 4 99K 1 R515 0757 0472 RES 200K 1 R516 0698 3456 RES 287K 1 R517 0698 3279 RES 4 99K 1 R518 0757 0442 RES 10K 1 125W R519 069
90. EEE E209 T205 390 R356 R357 C330 Ed 16 2 2W DRIVE2A Bata 8 9 10 XFMR1 XFMR2 NOT LOCATED D207 R237 ON BOARD T204 4 7K lt DRIVE1B lt I DRIVE2B PRIMARY2 PRIMARY1 1 J223 42241 XFMR3 XFMR1 XFMR2 NOT LOCATED ON BORRD IXFMR2A C339 50 157 50 10 1000 2 R368 Czaa lt R375 60 4K 4 75K 10 6 8 35 0504 13 11 2 pRIuEan M393 12 DRIVE1A Y HUA N 5x 1 44 415 E306 WH RED 70313 750324 144150 E307 50 R354 329 5 R380 lt OPTO OPTO Figure 6 10 A3 FET Board Schematic Diagram sheet 1 of 2 PRIMARY2 PRIMARY 1 E202 RAIL RED NOT USED D201 207 0815 D204 C213 100PF 100PF 5000 5000 R205 R206 L201 R213 R214 WIMA PF 213 R231 R233 frm 0211 a 12 150 120 MKS 4 0204 2 Q244 rm AAR RA 6 2 5 75 5 SW SW 1214 75 5 6 2 5 15U 1 44 1744 202 1 1 1 44 1 44 a ceto 5545 c244 C239 R264 150 R203 0220 0 1 0 1 P222 7 Io TAB 10PF E s e251 3 bree 2 2 ike 40097 14009 R221 2 226 3 9253 ge sr 50 1000 1 44 5 vA 1x L205 L206 150 1209 1210 15k AN 1 R265 upp 9 R268 UD
91. ING FIG 3 3 D 6070 SHEET 3 Figure 3 1 Overall Troubleshooting Sheet 2 of 4 36 Troubleshooting FROM SHEET 2 PROGRAM OV TO MAXIMUM AND PRESS PAOT CLEAR KEY OUTPUT SHOULD GO TO FULL SCALE VOLTAGE PRESS OUTPUT ON OFF REPEATEDLY WHILE WATCHING VOLTAGE DISPLAY DOWNPROGRAMMING SHOULD TAKE LESS THAN 1 SECOND GO TO SLOW DOWN PROGRAMMING TROUBLESHOOTING SEE FG 3 12 TURN OFF SUPPLY CONNECT A GPIB CONTROLLER TO THE SUPPLY CHECK IF SUPPLY ACCEPTS GPIB COMMANDS ACCEPTS COMMANDS CHECK GPIB CABLE 420115 087 Ut20 Utt4 CHECK OPERATION OF THE DIGITAL CONTROL PORT SERIAL LINK ANO THE FRONT PANEL V ROTARY CONTROLS DIGITAL CONTROL PORT CHECK AZ2U113 0118 11114 USE PRIMARY SA OK TABLE 3 5 TO CHECK A2U114 UNS CHECK A220109 U114 USE PRIMARY SA TABLE 3 5 TO CHECK FRONT PANEL CHECK VOLTAGE 9 AND OR CURRENT A1G2 CONTROLS OK CONTROLS ANO CABLE CONNECTIONS NO PROBLEMS FOUNO PERFORM VERIFICATIONS TESTS IN CHAPTER 2 TO DETERMINE IF A PROBLEM EXISTS Figure 3 1 Overall Troubleshooting Sheet 3 of 4 Troubleshooting 37 FROM SHEET FROM SHEET 2 x gt GO TO OUTPUT HELD LOW GE RIGHT ut ON ov TROUBLE SHOOTING FIG 3 6 QUTSIDE SPEC YES YES CHECK CURRENT AMP CIRCUITS PR TPUT HELD HIGH ESS PROTECT KEY GO TO OUTPUT A10U620 U622 U624 TROUBLESHOOTING FIG 3 6 or DISPLAYED CHECK 1 517 0506
92. IVE APPROXIMATION A D 4 PM 7345 R569 DC11 50811 RFB 4 99K DC10 5 0 10 FAN_DEW lo D 8 AMB_SENSE C AMP D 6 9 12 b DB6 14 ucu it 085 QUTi 115 751084 AGND 50 500 548 VE V LP365 DB3 DGND 100K 16 13 D 2 13 hap C536 C544 IMON 061 14 081 500 DCO 15 DBO 0 1 V 150 RDBDAC 12 oe 500 UREF Z 9520 07528 17 uD 11 60 u 05 13 DBO RFB A 5 0518 DB1 4 5 D 2 12 Daa SHUNT_TRIM L CLK1 L z PRE D 3 11 DBZ gt gt CLK D 4 10 ep DSS 5 1084 Lidar 6 8 lt oe asp C3 DUREF 6 amp DAC B ies pre eS QUT 4 e0 UREF B SHUNT TRIM OU DRCS 6 5 15V Figure 6 26 A10 Control Board Schematic Diagram Sheet 2 of 4 RAMP GENERATOR DIVIDER amp DEADTIME LATCH RS94 1K 561 T gooPr C394 500 12 ON LATCH 0604 HC00 V FAST SENSE 4 gt C582 NOT LOADED R620 0589 16 2K FAST SENSE R621 CONNECTOR R610 584 30 1K FILTER 30 1K J512 1 C588 NOT LOADED MEE 2 2pF R622 _ C590 100U OR_GATE pg ak FILTER
93. J431 2 Rail 2 Voltage Measure approximately 290 VDC J801 4 to J801 5 GPIB 5V Bias 15 0 9 measure approx 11VAC 1801 1 to J801 2 Fan voltage Measure 24VDC J827 1 to J827 2 Inrush relay coil Measure 24VDC J827 1 to J827 3 Rail relay coil Measure 24VDC after power on initialization test R331 24V Primary Measure approximately 34V AC R330 15Vs secondary bias 15 0 9V C354 25V 22 5V to 27 5V U310 16 RELAY 0v U308 6 RESET 0V U308 7 BIAS OK Diagrams 117 Table 6 3 Test Points continued TEST POINT No amp Loc Signal Tested Measurement and Conditions U308 1 PREF 2 5V U308 5 RESET Held low for approximately 50 ms at power on then goes high 0311 7 FAN DETECT 3V D317 25V 3V U311 2 FAN_PWN 0 6V A3 FET Board Test points through are on the A3 FET Board Troubleshooting procedures at these points are given under Dynamic Troubleshooting section of the FET Troubleshooting Chart Table 3 4 A10 Control Board C500 Secondary common Sheet 1 U504 6 CC CC DACs reference Sheet 1 U503 7 Readback DAC reference Sheet 1 U513 6 CVPROG Sheets 2 4 U514 6 CVPROG Sheets 2 4 NOTE Measurements at test points through where taken under the following conditions 1 Programming a Voltage scale b Current scale c OV full scale 2 First measurement in CV mode with no load 3 Second measurement in CC mode with output shorted U621 1 VMON Sheet 4 U621 7 C
94. K 1 RES 17 8K 1 RES 15K 1 RES 30 1K 1 RES 75K 1 RES 121K 1 RES 150K 1 Replaceable Parts 109 Table 5 14 10 Control Assembly Replaceable Parts continued R624 0757 0453 RES 30 1K 1 R625 6680A 6681A 0698 3455 RES 261K 1 6682A 0757 0461 RES 68 1K 1 6683A 6684 0699 1972 RES 1 74M 1 R626 6680A 6681A 0698 3455 RES 261K 1 6682A 0699 0088 RES 1 21M 1 6683A 6684 0757 0480 RES 432K 1 R627 628 0698 3455 RES 261K 1 R629 0698 4479 RES 14K 1 125W R632 0757 0273 RES 3 01K 1 R633 0757 0465 RES 100K 1 R634 0757 0442 RES 10K 1 125W R635 0698 3450 RES 42 2K 1 R636 0757 0280 RES IK 1 125W R637 6680A 6681A 6682A 0757 0465 RES 100K 1 6683A 0757 0466 RES 110K 1 6684 0757 0464 RES 90 0K 1 R638 0698 3279 RES 4 99K 1 R639 6680A 6681A 0757 0463 RES 82 5K 1 6682A 0757 0464 RES 90 9K 1 6683A 0757 0466 RES 110K 1 6684 0757 0464 RES 90 9K 1 R640 0698 3279 RES 4 99K 1 R641 6680A 6681A 0757 0452 RES 27 4K 1 6682A 6683A 6684A 0698 3156 RES 14 7K 1 R642 0757 0410 RES 301 1 R643 0757 0429 RES 1 82K 1 R644 0757 0434 RES 3 65K 1 R645 6680A 0698 8827 RES IM 1 6681A 6682A 0699 0070 RES 3 16M 1 6683A 6684 0699 0070 RES 3 16M 1 R646 6680A 6681A 0699 0088 RES 1 2M 1 6682A 6683A 6684A 0698 3215 RES 499K 1 R658 659 0757 0278 RES 1 78K 1 R660 0698 8827 RES IM 1 125W R661 6680A 0757 0433 RES 3 32K 1 6681A 0757 0430 RES 2 21K 1 6682A 0757 0427 RES 1 5K 1
95. Location Figure 6 20 A7 Snubber Board Schematic Diagram d 7 1000 C902 o MZ OF E1003 E1004 DEN 52720 0 E1001 BUS BRR 901 5 do 5 1004 10 0 E1002 E1001 C900 51000 NIA 8 500 Figure 6 21 8 Fast Sense Board Component Location Figure 6 22 8 Fast Sense Board Schematic Diagram 984 OOOO on 984 UROUPAT OOD MOO oss 09868 06 58 Figure 6 23 9 Down Programming Slow Sense Component Location NOTE THIS CONNECTION IS MADE ON THE BUSS BAR m C905 ROSS Hd 1 44 C953 R954 21 174W C952 055 250VAC 022 250VAC 1 E957 0902 JO10 3 OUT 4910 4 00 SIGNAL GND zio J POST BURN OUT TRACKS gt J910 9 SHUNT COMMON 4910 10 J910 1 DP SHUNT 4910 2 JO10 8 CONTROL 234910 7 14 30 J910 5 ISEN J910 6 ISEN FAST ON LUGS FOR SHUNT 120 Figure 6 24 9 Down Programming Slow Sense Schematic Diagram ONO j yy J509 9999 00000
96. NECTOR J441 1252 0056 CONNECTOR L420 421 5080 2300 INDUCTOR NM R420 421 422 0698 3611 RES 27 5 2W MO R423 424 425 426 427 428 0764 0044 RES 8 2K 5 2W R429 430 431 432 433 434 0764 0044 RES 8 2K 5 2W MECHANICAL PARTS 5080 2286 CABLE BIAS 24V SECONDARY Ref E440 E443 to BIAS J816 5080 2288 CABLE AC POWER Ref E420 E425 to ACINPUT J420 5080 2289 CABLE AC BIAS Ref E430 E434 to ACINPUT J419 5080 2293 CABLE BIAS LINE SELECT Ref E444 E447 to J436 J437 5080 2294 CABLE RAIL LINE SELECT Ref E448 451 to J438 J439 Table 5 10 A6 Bias Assembly Replaceable Parts Ref Desig Agilent Part No ELECTRICAL PARTS C800 0160 4834 CAP 047uF 10 C801 0180 4140 CAP 1800 uF 63V C803 0160 5422 CAP 047uF 20 C804 0180 4131 CAP 4 7uF 35V C805 0160 7743 C F 047uF 380V C806 0160 4834 CAP 047uF 10 C807 0180 3587 CAP 1000uF 50V C808 0180 0230 50V C809 810 0180 4129 CAP 35V C811 812 0160 4834 CAP 047uF 10 C813 0180 2980 C F 1000uF 50V C814 815 0180 4129 CAP 35V C8 16 817 0180 4405 CAP 470 uF 50V C818 819 0180 0230 50V C820 821 822 0180 4129 CAP 35V 100 Replaceable Parts C823 C824 825 C826 C827 C828 C829 830 831 C841 C842 C843 844 845 C846 C847 D800 801 802 803 804 805 D806 807 808 809 810 811 D812 813 814 815 816 817 D818 819 D820 D830 D832 F800 F803 804 805 806 1801 1809 1816 1821 1827 1830 831 Q818 819 0820 821 822 R800
97. NNECTOR ss Pp asa C3 Lak 50 2 4 3 4 lt Lake J507 A P2 5 PZ 5 6 LMM 0U TD TELE S1 succ 2 6 JACK Z RX R531 P272 L ed 31 6 3 xTAL2 ER pes 8STX 267 XTAL1 RST 25 RESET ANAC 012 1 PSEN 2 RT lt RESET C513 R532 80051 C518 V 3 01K GND a TSPF 0 1 SGND 1000 E 560 ALE_CK 50 gt Figure 6 26 10 Control Board Schematic Diagram Sheet 1 of 4 50 550 ANA 0 7 5 18 gt CUPROG R558 D049 DD O 10U U510 287K PM 7545 DC11 4 10811 RFB DC10 5 0810 R564 202 5 DBS 2088 2 DCG DB6 10 065 04 11 1084 AGND 12 DC3 DB3 DGND D 13 DB2 D 14 1508 R565 CUDAC DBO 10K 17 15 gt 150 EAT 17104 CONSTANT VOLTAGE D A n IMON AMP 100 RIJS R555 100K 75K C537 7047 50U R561 IMON UDD 24 EXER C541 4 PM 7545 C538 D g D811 RFB 20810 R554 047 1 9 089 100K 209 50 7 DC2 51087 15V READBACK R562 DCG 2056 COMPARATORS C UMON Des 111085 D 15 084 AGND gt CCPROG D DB3 DGND 13 Be 0 10U 141581 15 11 6U DCO DB0 gt R566 ll ion gt CONSTANT CURRENT D A RSS6 42 2K R557 10U NVV 1K C539 1500PF 1009 SUCCESS
98. NOM INHIBIT LOW AFTER 10 SEC DELAY 0504 pee 6 5 BIAS BOLD 7 DETECT 13 3K 50 RESET 150 J509 8 lt 505 1 ENABLE Y 0505 4 0501 COMPARATOR 14 3U UM R519 gt 8 d 2 BIAS BOARD 1 09 4 99 gt gt PWM_EN 16 CONNECTOR PWM DISABLE PNE 6 D507 RESET FAN DETECT J509 15 C509 5 R524 RESET R520 i ih 13 43U NOM 25 15U DETECT 10K 100 1 00 R525 10 DNPGM J509 10 150 87 100 FAN_DEW N gt AMB_SENSE STX 5U OU COMPARATOR 504 4 g 50 E R534 0508 R535 LT1021 R529 02 1500 042 U NNA M 54 2k 500 500 16M 130K 54 C517 150 6 2 DAC REFERENCE 20 18 UCC E poss R5z6 OUT 0505 R530 1 1 a pple 011 9 D 8 5 fa 2155 DC10 4 DO 1 3 7 rs DO 3 DC10 14 a R537 R538 FAN 4 8 1 LS pan Dg 39 1 16 1009 t s J509 16 5 15 5 0 0 1 0 0 1M m 68114 4 AE ha 3850 4 p171 L2 51 DC0 11 15U 13 I5 Fa DC10 32 3 D2 6 7 13 7 0 2 1 2 RS3o 8116 FiHa 0011 361 3 4 003 912 3550 4 DU 0519 UDP 5 11 T5U I8 19 34 0 5 Pis 6 D 159 c512 GAL 1608 QUSCR 350 6 Pie RX STX GND pi 2L 8 D 560 OUREF R540 05307 10 BSTX 1 62K 16195 SECONDARY _15U 17 ae MICROPROCESSOR lt Pe P3 CCDAC g P2 0 P3 0 l P2 1 P3 1 RDBDAC HPIB BOARD Para 3 2 CO
99. OR LM339N VOLTAGE COMPTR LT101ICN8 PWM LC IR2110 IC VOLTAGE REG TL431CP IC LM393N OPTO ISOLATOR HCPL 2200 DIO ZNR 6 19V MECHANICAL PARTS 5080 2279 5080 2283 5080 2291 5080 2295 CABLE FET CONTROL Ref 208 209 to CONTROL 1511 CABLE 15V BIAS Ref E206 E207 to BIAS J831 Ref E306 E307 to BIAS J830 CABLE FET RAIL A Ref E201 E202 to DCRAIL J430 CABLE FET RAIL B Ref E301 E302 to DCRAIL J431 Table 5 8 A4 AC Input Assembly Replaceable Parts Ref Desig Agilent Part No ELECTRICAL PARTS 0160 7606 0160 7898 1251 5422 1251 6832 1251 3819 0490 1908 5060 3593 0699 3191 0698 3609 CAP luF 275V CAP 0 01uF 440V CONNECTOR CONNECTOR CONNECTOR RELAY 24V COIL CONTACTOR 3 POLE Not Used RES 27 5 20W RES 22 OHM 5 2W MECHANICAL PARTS 5060 3493 5080 2284 WIRE KIT 403 408 to FLF2 F3 CABLE RELAY CNTRL E411 E413 to BIAS J827 Replaceable Parts 99 Table 5 9 5 DC Rail Assembly Replaceable Parts Ref Desig Agilent Part No ELECTRICAL PARTS C418 0160 4048 CAP 0 022uF 20 C420 421 422 0160 7606 CAP luF 275V C427 0160 7743 C F 047uF 380V D420 421 422 424 425 5060 3516 ASSY RECTIFIER DS420 421 1990 0517 LED F420 2110 1107 FUSE CLIPS F420 2110 0934 FUSE 5AM 500V F421 2110 1107 FUSE CLIPS F421 2110 0934 FUSE 5AM 500V J430 431 1251 7616 CONNECTOR J432 1251 6832 CONNECTOR J433 1251 3819 CONNECTOR J436 437 438 439 1251 3837 CONNECTOR J440 1252 0055 CON
100. ORY PRESET CAL 5 6 8 x FLT INH 7 8 NORM 7 POSITION OF JUMPER AS SHIPPED FROM THE FACTORY Figure 3 14 Test Header Jumper Positions Troubleshooting 57 Table 3 5 Primary Interface SA Test Description These signatures check some primary interface circuits on the Systems Supply A2 GPIB Board Valid A2U106 ROM Firmware Revision A 01 06 Test Setup See Figure 3 17 1 Turn off the power supply and remove the top cover 2 Connect SA jumper of connector J106 on A2 GPIB Board see Figure 3 15 3 Connect signature analyzer CLOCK START STOP and GROUND inputs as show in Figure 3 16 4 Turn on the power supply and use the signature analyzer probe to take the following signatures Power 5V 9FFP Serial Link A2U109 3 0104 Microprocessor A2U114 24 9FFP A2U114 25 UF39 Digital Control Interface A2U118 1 9AF1 A2U118 9 40A5 A2U118 10 1029 A2U118 15 0010 A2U118 16 040A Gated Array Logic 20119 2 0 55 A2U119 5 0040 A2U119 15 0040 5 After completing the tests be sure to return the J106 jumper to its original position Edge 2 Board Front Panel A10 Board Input Setting Connection Board Connection Connection CLOCK J106 5 J2 9 1504 32 START J106 6 J2 11 U502 7 STOP NL J106 6 J2 11 U502 7 GROUND 106 4 J2 8 U502 10 Figure 3 15 Signature Analysis Signal Inputs 58 Troubleshooting GROUND STRRT STOP
101. RT A2U112 UART A2U112 UART A2U112 defective or GPIB board is in SA mode UART A2U112 defective or GPIB board is in SA mode EEPROM AIU6 defective or calibration error See Figure 3 12 Troubleshooting 33 Troubleshooting Charts Figure 3 1 gives overall troubleshooting procedures to isolate the fault to a circuit board or particular circuit see Figure 3 20 for the location of the circuit boards These procedures include the use of power on selftest Table 3 2 and signature analysis techniques Table 3 5 through Table 3 7 Some results of Figure 3 1 lead to more detailed troubleshooting charts that guide you to specific components The troubleshooting charts are organized as follows Trouble or Circuit Figure 3 1 Overall procedure checks selftest errors calibration errors ac input circuit fan readback circuits 10 Control Board GPIB cable digital port serial link rotary controls current amplifier Figure 3 2 No display from Figure 3 1 Figure 3 3 OV circuit not firing from Figure 3 1 Figure 3 4 OV circuit is on at turn on from Figure 3 1 Figure 3 5 Output level is held low from Figure 3 1 Figure 3 6 Output level is held high from Figure 3 1 Figure 3 7 DAC circuits from Figure 3 1 Figure 3 8 DAC test waveforms Figure 3 9 CV and CC DAC and amplifiers from Figure 3 1 Figure 3 10 Serial Down circuit from Figure 3 1 Figure 3 11 Secondary interface circuit from Figure 3 1 Figure
102. Readings within specified High Voltage limits CV Load Effect This test measures the change in output voltage resulting from a change in output current from full load to no load 1 Turn off the power supply and connect a DVM across S and S see Fig 2 1 Turn on the power supply and program the current to its maximum programmable value and the voltage to its full scale value see Table 2 2 Adjust the load to produce full scale current see Table 2 2 as shown on CV annunciator is on If it is not adjust the front panel display the load to slightly reduce the output current until the annunciator comes on Record voltage reading of the DVM Adjust load to draw 0 amperes open load Record voltage reading of the DVM Check test result The difference between the DVM readings in steps 4 and 5 are within the specified Load Effect limits CV Source Effect This test measures the change in output voltage resulting from a change in ac line voltage from its minimum to maximum value within the line voltage specifications Turn off the power supply and connect the ac power input through a variable voltage transformer 16 Verification Table 2 4 Constant Voltage CV Tests continued CV Source Effect cont 2 Set the transformer to the nominal ac line voltage Connect the DVM across S and S see Fig 2 1 3 Turn on the power supply and program the current to its maximum programmable value and the voltage to its ful
103. S 60 4K 1 R251 0757 0288 RES 9 09K 1 R252 0698 3225 RES 1 43K 1 R253 0698 6533 RES 12 5K 1 R254 0698 3279 RES 4 99K 1 R255 0683 1015 RES 100 5 25W R256 0698 3432 RES 26 1 1 R257 0698 3430 RES 21 5 1 R258 0683 1035 RES 10K 5 25W R260 261 0683 8205 RES 82 5 25W R262 0683 1215 RES 120 5 25W R263 264 265 0683 8205 RES 82 5 25W 0683 1215 RES 120 5 25W 0683 8205 RES 82 5 25W 0698 3572 RES 60 4K 1 0698 4121 RES 11 3K 1 0757 0440 RES 7 5K 1 Replaceable Parts 97 Table 5 7 FET Assembly Replaceable Parts continued R271 0757 0200 RES 5 62K 1 R272 0757 0442 RES 10K 1 125W R273 274 275 0757 0437 RES 4 75K 1 R277 0698 3633 RES 3905 2W MO R301 0811 3903 RES 1500hm 5W NI R302 0699 0208 RES 15 25W CF R303 0683 5615 RES 5605 25W R304 0698 4435 RES 2 49K 1 R305 0683 0625 RES6 25 25W R306 0683 7505 RES 75 5 25W R307 0683 0335 RES 3 3 5 25W R308 0683 3305 RES 33 5 25W R309 0683 0625 RES 6 2 5 25W R310 0683 8205 RES 82 5 25W R311 0683 1535 RES 15K 5 25W R312 0683 1535 RES 15K 5 25W R313 314 316 317 0811 3903 RES 150 Ohm 5W NI R320 321 0811 3903 RES 150 Ohm 5W NI R322 0811 2556 RES 1 25 1 4W R324 325 0811 3903 RES 150 Ohm 5W NI R326 0683 1535 RES 15K 5 25W R327 0683 1555 RES 1 5M 5 25W R328 0683 8205 RES 82 5 25W R329 0683 0625 RES 6 2 5 25W R330 0683 3305 RES 33 5 25W R331 0683 7505 RES 75 5 25W R332 0683 0335 RES 3 3 5 25W R333 0683 0625 RES 6 2 5 25W R337 075
104. SERVICE MANUAL GPIB DC Power Supplies Agilent Series 668xA For instruments with serial numbers Agilent 6680A SG41000110 and above Agilent 6681A MY41000114 and above Agilent 6682A MY41000106 and above Agilent 6683A MY41000109 and above Agilent 6684A MY41000115 and above For manual updates a change page may be included For instruments with lower serial numbers or instruments with the older two part serial number format see Appendix A fit Agilent Technologies Agilent Part No 5960 5590 Printed in Malaysia Microfiche Part No 5960 5591 March 2002 CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three years from date of delivery Agilent Technologies software and firmware products which are designated by Agilent Technologies for use with a hardware product and when properly installed on that hardware product are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period o
105. T TO COMPLETE USE A SCOPE TO CHECK THE CV DAC A10U513 6 CC DAC A10U514 6 AND RE ADBACK DAC A10U515 6 OUTPUTS COMPARE THE WAVEFORMS TAKEN AT THESE POINTS WITH THE WAVEFORMS GIVEN IN FIG 3 8 15 ONE DAC OUTPUT MISSING STEPS DAC IS DEFECTIVE CV A10U510 A100511 OR READBACK 4100512 ARE ALL DACS MISSING CHECK A10U506 SEE TABLE 3 7 STEPS IS OR CC DAC CHECK REF VOLTAGE FOR CVICC DACS AT DEFECTIVE 0604 6 37 WITH RESPECT TO DOES A10U504 6 10V TROUBLESHOOTING SEE FIG 3 9 CHECK REF Ga wi FOR READBACK DAC AT PERFORM DAC AMPLIFIER A10U503 7 38 WITH RESPECT TO 56 DOES A10U503 7 CHECK A10U512 U515 W 6V CHECK A10U503 CHECK A10U504 Figure 3 7 DAC Circuits Troubleshooting Troubleshooting 45 1E IE eerie 6 r P CEE 0 2 mS DiV A CV DAC U508 6 AND CC DAC U510 6 OUTPUTS Ec sss w a mm 0 2 mS DIV READBACK DAC U512 6 OUTPUT Figure 3 8 DAC Test Waveforms 46 Troubleshooting THE OR CC DAC CIRCUIT 15 DEFECTIVE FEEDBACK RESISTOR USE THIS TEST TO ISOLATE BETWEEN THE DAC AND THE AMPUFIER TURN SUPPLY OFF AND TURN IT BACK ON AS TO SKIP SELF TEST WAIT FOR POWER ONINIT TO COMPLETE mM DAC PROGRAM THE VOLTAGE AND CURRENT A10USIQ 1
106. T SINK LM337T REGULATOR ASSY U805 5060 2942 HEAT SINK LM317T REGULATOR ASSY U806 1826 0544 IC V RGLTR 2 5V MC1403U U807 1826 0138 IC COMPARATOR LM339N U808 1858 0047 XSTR ARY 16P DIP U809 810 811 1990 1074 OPTO ISOLATOR 4N35 U812 1826 0161 IC LM324N U813 1990 1074 OPTO ISOLATOR 4N35 MECHANICAL PARTS 5080 2292 CABLE PRIMARY BIAS Ref E800 E804 to DCRAIL J432 102 Replaceable Parts Table 5 11 7 Snubber Assembly Replaceable Parts Ref Desig Agilent Part No ELECTRICAL PARTS C910 911 912 913 6680A 6681A 0160 0162 CAP 022uF 10 6682A 0160 6896 CAP 015uF 10 6683A 0160 4845 CAP 6800pF 10 6684A 0160 6162 CAP 4700pF 10 R910 911 912 913 6680A 6681A 0698 3601 RES 10 5 2W MO 6682A 0698 3611 RES 27 5 2W MO 6683A 0764 0013 RES 56 5 2W MO 6684A 0698 3614 RES 43 5 2W R914 915 916 917 918 6680A 6681A not used 6682A 0698 3611 RES 27 5 2W MO 6683A 0764 0013 RES 56 5 2W 6684A 0698 3614 RES 43 5 2W MO R919 920 921 6680A 6681A not used 6682A 0698 3611 RES 27 5 2W MO 6683A 0764 0013 RES 56 5 2W 6684A 0698 3614 RES 43 5 2W MECHANICAL PARTS 6680A 6681A 5060 3327 WIRE KIT 2 required Ref D900 D901 D902 D903 6682A 6683A 6684A 5060 3365 WIRE KIT Ref D900A B D901A B Table 5 12 A7 Fast Sense Assembly Replaceable Parts Ref Desig Agilent Part No ELECTRICAL PARTS 06680 60023 FAST SENSE PC ASSEMBLY Ref 6680A POWER SUPPLY 06681 60023 FAST SENSE PC ASSEMBLY Ref 6
107. V C315 316 0160 2006 CAP 100 10 C317 0160 5098 CAP 22uF 10 C318 0160 4835 CAP luF 10 50V C319 0160 2006 CAP 100 10 C320 0180 4132 CAP 6 8uF 35V C321 0160 5098 CAP 22uF 10 C322 0180 4132 CAP 6 8uF 35V C326 0160 4791 CAP 10pF 5 100V C329 0160 5098 CAP 22uF 10 C330 0160 4832 CAP 01uF 10 C331 0160 4835 CAP luF 10 50V C335 336 337 338 0160 4832 CAP 0luF 10 C339 0160 4791 CAP 10pF 5 100V C340 0160 4832 CAP 01uF 10 C342 343 0160 5098 CAP 22uF 10 C344 345 0160 6806 CAP luF 400V C346 0160 4800 CAP 120 5 D201 202 1901 0050 DIO SWITCHIN D202 1901 1065 DIO IN4936 PW D203 204 1901 0050 DIO SWITCHIN D205 1901 1065 DIO IN4936 PW D206 207 208 209 210 1901 0050 DIO SWITCHIN D213 214 215 216 217 1901 0050 DIO SWITCHIN D220 221 222 223 1901 0050 DIO SWITCHIN D224 1901 0731 DIO PWR RECT D301 302 1901 0050 DIO SWITCHIN D302 1901 1065 DIO IN4936 PWR D303 304 1901 0050 DIO SWITCHING D305 1901 1065 DIO IN4936 PWR D306 307 308 309 310 1901 0050 DIO SWITCHING D313 314 315 316 317 1901 0050 DIO SWITCHING D320 321 322 323 1901 0050 DIO SWITCHING D324 1901 0731 DIO PWR RECT L201 202 203 204 9170 1454 CORE SHLD BEAD L205 206 207 208 209 9170 1510 CORE MAGNETIC L210 211 212 9170 1510 CORE MAGNETIC L213 214 215 216 9170 1454 CORE SHLD BEAD L301 302 303 304 9170 1454 CORE SHLD BEAD L305 306 307 308 309 9170 1510 CORE MAGNETIC L310 311 312 9170 1510 CORE MAGNETIC L313 314 315 31
108. V CONTROL Sheet 4 0502 2 Sheet 4 CV mode 0V CC mode 5V U624 1 CC CLAMP AMP output Sheet 4 CV mode 2 2V CC mode 2 2V U622 6 1ST I AMP output Sheet 4 CV mode 0V CC mode 0 4V U620 7 2ND I AMP output Sheet 4 CV mode 0V CC mode 4 5V U620 1 CC CONTROL Sheet 4 CV mode 10V CC mode 0 4V U502 3 CC Sheet 4 CV mode 5V CC mode 0V Y608 7 FAST SENSE AMP Sheet 3 CV mode 4V CC mode 0V U607 7 RAMP GEN Sheet 3 See Figure 6 1 51 U607 1 RAMP GEN Sheet 3 See Figure 6 1 U602 9 DIVIDER output Sheet 3 See Figure 6 1 S3 U605 3 SUMMING POINT Sheet 3 See Figure 6 1 U602 6 DEADTIME LATCH Sheet 3 See Figure 6 1 U605 7 SUMMING COMPARATOR See Figure 6 1 Sheet 3 118 Diagrams Table 6 3 Test Points continued TEST POINT No amp Loc Signal Tested Measurement and Conditions A10 Control Board continued U600 10 DIVIDER CLOCK Sheet 3 See Figure 6 1 U601 6 DIVIDER RESET Sheet 3 See Figure 6 1 U601 3 ON LATCH CLOCK Sheet 3 See Figure 6 1 U604 3 ON LATCH Sheet 3 See Figure 6 1 U603 3 PWM EN Sheet 3 Held high for approximately 12 seconds at power on then goes low NOTE Temporarily move both scope leads to J511 for TP 1511 1 2 DRV DRV B Sheet 3 See Figure 6 1 0502 14 5V 0501 7 OVREF Sheets 1 3 5 4V 65 Q602 C DP CONTROL Sheet 3 CV Mode Not Applicable 66 U608 7 DP CONTROL Sheet 3 CV Mode 13V 67 U630 11 PREF_2 Sheets 1 3 1V 68 U630 12 DN PGM Sheets 1 3
109. W RES 22K 1 125W RES 2 5K 1 RES 3 16M 1 RES 34K 1 125W RES 6 19K 1 RES 2K 1 125W RES 3 16M 1 RES 12 1K 1 RES 1 21K 1 RES 12 1K 1 RES ZERO OHMS RES 6 19K 196 RES IK 1 125W RES 10K 1 125W RES 2 61K 1 RES 10K 1 125W Replaceable Parts 101 Table 5 10 6 Bias Assembly Replaceable Parts continued R841 0698 6363 RES 40K 1 R842 0698 6360 RES 10K 1 R843 0757 0472 RES 200K 1 R844 0698 6977 RES 30K 1 125 R845 847 0698 6360 RES 10K 1 R848 0698 6977 RES 30K 196 125 R849 0683 3325 RES 3 3K 5 25W R850 0698 6977 RES 30K 1 125 R851 0698 4037 RES 46 4 1 R852 0683 3325 RES 3 3K 5 25W R853 854 855 0683 1005 RES 105 25W R856 0698 3152 RES 3 48K 1 R857 0698 4037 RES 46 4 1 R858 859 860 0683 1005 RES 105 25W R861 0698 8234 RES 12 1K 1 R862 0699 0070 RES 3 16M 1 R863 0757 0469 RES 150K 1 R864 0699 0070 RES 3 16M 1 R865 0757 0464 RES 90 9K 1 R867 0757 0290 RES 6 19K 1 R868 0757 0199 RES 21 5K 1 R869 0757 0281 RES 2 74K 1 R870 8159 0005 RES ZERO OHMS R871 0698 3440 RES 196 1 125W R872 0698 0084 RES 2 15K 1 R873 8159 0005 RES ZERO OHMS R874 0757 0274 RES 1 21K 1 R875 0698 4037 RES 46 4 1 R876 877 878 0683 1005 RES 105 25W R879 880 8159 0005 RES ZERO OHMS 801 9100 5040 XFMR GPIB T802 9100 5041 XFMR BIAS U801 5060 2942 HEAT SINK LM317T REGULATOR ASSY U802 5060 2948 HEAT SINK UA7805UC REGULATOR ASSY U803 5060 2942 HEAT SINK LM317T REGULATOR ASSY U804 5060 2943 HEA
110. able sse 13 160 Index Manual Updates The following updates have been made to this manual since the print revision indicated on the title page 7 09 performance test records pages 24 28 been updated to remove the measurement uncertainties and correct minor discrepancies in the test limits The CC Noise PARD performance test has been removed as Constant Current Ripple and Noise is not a performance specification but a supplemental characteristic
111. ac or 360Vac Observe the DVM reading Divide this voltage by the resistance of the current monitoring resistor to obtain the output current Record the result Adjust the transformer to increase the ac input voltage to the high line condition 235Vac or 440Vac Observe the DVM reading Divide this voltage by the resistance of the current monitoring resistor to obtain the output current Record the result Check the test result The power supply output current is full scale and its CC annunciator is on If not reduce the Electronic Load voltage slightly until the annunciator comes on You may want to use an averaged reading for this measurement You may want to use an averaged reading for this measurement The difference between the current readings found in Step 6 and Step 8 is within the specified current Source Effect limits Verification 21 Electronic Current Monitor Load Resistor x Power Suppiy a CC Test Setup with 5KW Electronic Load Note Series power source required for CC Load Regulation Test allows UUT to operate at O volts and electronic load operate at its minimum input voltage specification Voltage source must always be in CV mode UUT must be in CC mode for all CC tests Current Monitor 5KW Load Resistor b CC Test Setup with 5KW Load Resistor Note Start with switch closed take reading at 0 output voltage open switch and take full load reading UUT mus
112. al parts are placed after the electrical parts and listed alphabetically by part description Unless otherwise specified a listed part is used in all models of the series Model specific parts are tabulated by model number under the reference designator The reference designators are defined in Table 5 1 Abbreviations used in parts descriptions are explained in Table 5 2 Table 5 1 Part Reference Designators assembly blower fan capacitor thyristor SCR diode display LCD fuse metric machine millimeter mounting assembly board belleville ground long pc board jack relay inductor plug transistor resistor thermal resistor square subminiature thick thread with switch transformer terminal block integrated circuit voltage regulator cable or jumper crystal oscillator w o without xfmr transformer xtal crystal Replaceable Parts 89 How to Order Parts You can order parts from your local Agilent Technologies Inc Sales and Support Office see the list of offices in the back of this manual When ordering a part please include the following information e the Agilent part number e the part description e the desired quantity e the model number of the power supply for example Agilent 6682A Table 5 3 Main Chassis Replaceable Parts Ref Desig Agilent Part No ASSEMBLIES amp SUBASSEMBLIES 5060 3553 TESTED FRONT PANEL KEYPAD 5060 3542 TESTED KEYPAD PCB ASSY 5063 4851 TESTED GPIB
113. al since the previous printing date Changes to the manual occurring between revisions are covered by change sheets shipped with the manual Note that not all changes made to the power supply affect the content of the manual Refer to Appendix A for a history of manual updates Edition 1 April 1994 Edition 2 September 2000 Updated March 2002 Copyright 1993 2000 Agilent Technologies Inc This document contains proprietary information protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated into another language without the prior consent of Agilent Technologies Inc The information contained in this document is subject to change without notice Table of Contents Introduction ce 7 HEEL 7 SS Mors Ue 7 nO RN 7 Related Documents bee getan Charige Sheet 5 2o de RIEN Operating Manuals ae mide A i Manual Revisions NR NO t Firmware Revisions SSSA NU ies Safety Considerations aa 9 Conventions o OOo eat oo pu e ieee ate a ed t ee des 9 Electrostatic e eee e HR E RTT EE CERE RE ERU e ia 9 us rcx EA 11 Introduction o vti Pe
114. al which represents the programmed overvoltage level When the output voltage exceeds the programmed OV value the downprogrammer circuits are activated and the FET switches are turned off The Downprogrammer control circuit generates control signal DP CONTROL whenever an OV or disable condition has been detected or when the output voltage exceeds the programmed value DP CONTROL causes the downprogrammer FETs Q980 Q981 on the A9 Downprogrammer Fast Sense board to conduct and conduct current away from the load 84 Principles Of Operation 4 Input Board 4 Input Board contains the Inrush Current Limit relay K401 Main Power Relay K402 current limiting resistors R407 R408 On power on the current limit relay K401 closes allowing the dc rail capacitors to charge under a controlled condition This applies ac voltage to the A6 Bias Board After the turn on initialization period approximately 10 seconds the main relay K402 closes shorting out the current limit resistor A5 DC Rail Board The 5 DC Rail board contains the full wave three phase rectifiers and the input filter circuits The ac mains are full wave rectified by D420 D425 and converted to two 300 volt dc rails by filter capacitors C423 C426 and by two range select connectors In range 1 180 235Vac J438 connects the two DC rails called Rail 1 and Rail 2 in parallel Each rail supplies 300Vdc to the A3 FET board via J430 and J431 In Range 2
115. an speed and ambient temperature and generates the FAN PWM control signal to adjust fan speed depending upon the ambient temperature measured internally in the power supply A dual DAC Shunt Trim OV Amplifier circuit 0520 0521 performs two functions One is to convert the programmed overvoltage value from the bus or front panel into the OVREF signal The OVREF signal is compared by U502 with the output voltage Second the Shunt Trim DAC calibrates the IMON signal by sampling the current flowing through current sense resistor R900 on the output power bus together with the TRIM input signal current P R900 MON TRIM DAC Figure 4 1 AC Calibration of IMON During power initiation the secondary processor generates PWM DISABLE to the power supply s output off for 10 seconds After 10 seconds PWM DISABLE 15 removed and the supply s output can be programmed CV CC Control P O A10 Board These circuits are shown in detail on the A10 Control Board schematic and include the CV constant voltage and CC constant current control loops The power supply must act as either a CV or CC supply for Principles Of Operation 83 any value of load impedance Switching between CV and is done automatically by the CV CC control circuits at a value of load impedance equal to the ratio of the programmed voltage value to the programmed current value A low level CV or CC signal is generated by the applicable status comparator
116. ce all eight with a matched set Table 3 4 FET Troubleshooting Chart Procedure Result Static Troubleshooting 1 Turn the power supply off and remove the FET board with its heatsink assembly attached see Disassembly Procedures 2 Measure the resistance between the Rail E202 amp E302 and the Rail E201 amp gt 20 E301 3 Measure the resistance between the gate of each FET gt 15KQ Q201 204 Q211 Q222 Q233 Q244 and Q301 304 Q311 Q322 Q333 and Q344 and common Rail 4 Measure the resistance across capacitor C201 amp C301 1500 5 Measure the resistance across the 15V bias input E206 to E207 and E306 to E307 1KQ in the forward direction and 490Q in the reverse direction Continue with Dynamic Troubleshooting on the next page Troubleshooting 53 Table 3 4 FET Troubleshooting Chart continued Procedure Result Dynamic Troubleshooting Turn off the power supply and remove the A3 FET Board with its heat sink See Disassembly Procedures assembly 2 Short the collectors of Q251 and Q253 or Q351 and Q353 by connecting the collector case of each transistor to common E507 3 Connect waveform generator to J200 1 and J200 2 Set generator to produce 20 kHz 20 triangular waveform See Figure 3 14A Connect 15V from an external supply to E206 or E306 positive and E207 or E307 common P All of the following measurements are taken with res
117. cement F Sel 1320 CLEAR SCREEN 1330 SELECT UPC Sel 1340 Select Initialization 1350 GOTO Init_eeprom 1360 CASE Select install new factory data 1370 GOTO Fact_preset 1380 CASE ELSE 1390 BEEP 1400 GOTO Start 1410 END SELECT 1420 1430 Init_eeprom 1440 PRINT Initializing EEPROM 1450 1460 FOR I 1 TO 49 1470 OUTPUT Ps DIAG EEPR Addr D Length D Init data T 1480 1490 GOTO Cal off 1500 1510 1520 Fact preset Figure 3 17 Initialization and Factory Preset Replacement Program Listing Sheet 3 of 5 66 Troubleshooting 1530 CLEAR SCREEN 1540 PRINT This program should ONLY be completed if your power supply 1550 PRINT EEPROM has been replaced or a component that will effect 1560 PRINT the calibration AND the alignment of voltage overvoltage 1570 PRINT and current is complete AND unit has passed the performance 1580 PRINT test Enter C to continue any other key to abort 1590 INPUT Cont prog 1600 IF UPC Cont_prog lt gt C THEN Cal off 1610 1620 CLEAR SCREEN 1630 PRINT Transferring calibration data to factory preset locations 1640 1650 Fact cal sour Address of factory calibration data source 1660 DATA 2 6 68 72 20 24 76 80 150 1670 1680 Fact cal dest Address of factory calibration data destination 1690 DATA 84 88 92 96 100 104 108 112 116 1700 1710 Fact cal len Length of factory cal
118. cifications for the product or improper site preparation and maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES AGILENT SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE The above statements apply only to the standard product warranty Warranty options extended support contracts product maintenance agreements and customer assistance agreements are also available Contact your nearest Agilent Technologies Sales and Service office for further information on Agilent Technologies full line of Support Programs SAFETY CONSIDERATIONS GENERAL This is a Safety Class 1 instrument provided with terminal for connection to protective earth ground OPERATION BEFORE APPLYING POWER verify that the product is set to match the available line voltage the correct line fuse is installed and all safety precautions see following warnings are taken In addition note the instrument s external markings described under Safety Symbols WARNING Servicing instructions are for use by service trained personnel To avoid dangerous electrical shock do not perform any servicing unless you are qualified to do so BEFORE SWIT
119. correct password as described in Appendix A of the Operating Manual As shipped from the factory the supply s model number e g 6681 is the password If you use an incorrect password PASSWD ERROR appears on the display during front panel calibration or error code 2 occurs during GPIB calibration and the calibration mode is disabled If you do not know the password you can recover the calibration function by restoring the preset factory calibration constants as described below Restoring Factory Calibration Constants This procedure allows you to recover the factory calibration constants The ability to do this allows you to operate the power supply for troubleshooting and or to recalibrate it as required To restore the original factory calibration constants proceed as follows Turn off the supply and remove the top cover Move the jumper in test header J3 on the Al Front Panel Board from the NORM to the FACTORY PRESET CAL position see Figure 3 15 Turn on the power supply and note that ADDR 5 and then PWR ON INIT appear briefly on the front panel display When PWR ON INIT no longer appears the supply s factory calibration constants have been restored and the password has been changed to 0 There is no longer any password protection You can now turn off the supply and restore the calibration jumper to the NORM position see Figure 3 15 Turn on the supply You may now set a new password if desired and recalibrate the power supply
120. ctrostatic discharge Observe standard antistatic precautions to avoid damage to the components see Chapter 1 Introduction Localizing the Problem This chapter provides troubleshooting and repair information for the power supply Before beginning troubleshooting procedures make certain the problem is in the power supply and not with an associated circuit the GPIB controller for GPIB system power supplies or ac input line Without removing the covers you can use the Verification tests in Chapter 2 to determine if the power supply is operating normally Chapter Organization The information in this chapter is organized as follows Topic Information Given Troubleshooting Procedures A series of flow charts for systematic location of defective boards circuits and components An explanation of the error codes and messages generated during the power on selftest Signature analysis techniques for troubleshooting the digital circuits on the front panel primary GPIB and secondary interface circuits Specific paragraphs for e Checking the bias and reference supplies e Troubleshooting the CV CC status annunciators e Troubleshooting the A3 FET board Post Repair Adjustments Calibration and EEPROM initialization procedures required after the replacement of certain critical components Disassembly Procedures Gaining access to and or replacing components Troubleshooting 31 Test Equipment Required Table 3 1 Test Equipment
121. d to power supply common The GAL IC also provides a serial I O port to the Al Front Panel Board to enable front panel control of the power supply A serial link interface IC U109 on the A2 GPIB Board allows up to sixteen supplies to be connected together and programmed from one GPIB address The first supply is the only supply connected directly to the GPIB controller and is set to the primary GPIB address The remaining supplies are set to secondary addresses and are linked daisy chained together via the J1 J2 phone jacks at the rear of each supply The serial link configuration is described in the Power Supply Operating Manual Principles Of Operation 81 digital control interface on the 2 GPIB Board provides the following power supply functions Relay link Digital 1 0 Remote inhibit INH Discrete fault indicator FLT An optical isolator U113 isolates the FLT output signal common from the external fault circuit common The desired digital interface function is selected by placing a jumper in a header J106 on the A2 GPIB Board Appendix D in the Power Supply Operating Manual describes how to select one of these functions and how to make the appropriate external connections to the DIG CNTL connector on the supply s rear panel Another jumper position on the header selects the SA signature analysis mode which is used for troubleshooting see Chapter 3 The A2 Board has a bias supply regulator IC U121 t
122. dback Vout 32mV Vout 32mV High Voltage 21V Vou 20 9706V 21 0294V Front Panel Display Readback Vout 42 5mV Vout 42 5mV Load Effect Vout 1 07mV Vout 1 07mV Source Effect Vout 1 07mV Vout 1 07MV PARD Ripple and Noise Peak to Peak RMS M Transient Response Time at 900 us Constant Current Tests Current Programming and Readback Low Current OA Lu 125mA 125mA Front Panel Display Readback Tout 165mA Tour 165mA High Current 240A Lout 239 635A 240 365A Front Panel Display Readback Tou 405mA Tour 405mA Load Effect Tout 22mA Tour 29mA Source Effect Tour 29mA Tou 29mA Enter your test results in this column Verification 27 Table 2 7 Performance Test Record for Agilent Model 6683A MODEL Agilent Report No Test Description Maximum 222227 GP Voltage Programming and Readback Low Voltage OV Vou Front Panel Display Readback High Voltage 32V Vou Front Panel Display Readback Load Effect Source Effect PARD Ripple and Noise Peak to Peak RMS Transient Response Time at 900 us Constant l u uz ee Tests 32mV Vou 48mV 31 9552V Vou 64mV Vou 1 74mV Vou 1 74mV 32mV Vou 48mV 32 0448V Vou 64mV Vou 1 74mV Vout 1 74mV Constant Current Tests Current Programming and Readback Low Current OA Lu Front Panel Display Readback High Current 160A Tout Front Panel Display Readback Load Effect Source Effect 85mA Tout 110mA 159
123. e 5080 2148 CABLE chaining 2 meters 5080 2168 CABLE ASSY 5080 2277 SUL THERMAL 5080 2280 CABLE BIAS CONTROL 5080 2282 CABLE AC RFI FILTER 5080 2285 CABLE GPIB FAN 92 Replaceable Parts Table 5 3 Main Chassis Replaceable Parts continued 1400 0611 CABLE CLAMP GPIB FAN 5080 2299 LABEL REAR PANEL 5080 2413 CRATE shipping container 5080 2414 SKID shipping container 5080 2415 FOAM PAD shipping container 5080 2314 EDGE PROTECTOR 12 inches shipping container 5080 2315 EDGE PROTECTOR 2 5 inches shipping container 5080 2316 CABLE ASSY 5960 5588 MANUAL OPERATING 6681A 400 400V OPERATION 6681A 601 BUS BAR COVER 6681A 602 BUS BAR SPACER 5060 3514 BB SPCR KIT 602 6681A 861 CABLE UL CSA 8120 6203 L CORD 10AWG300V 6681A 862 CABLE HARMONIZED 8120 6204 L CORD 2 5mm450V 6681A 908 RACK MOUNT KIT 5062 3974 RACK MTG KIT 5062 3977 RACK MOUNT KIT 6681A 909 RACK MOUNT KIT W HANDLES 5062 3974 RACK MTG KIT 5062 3983 RACK MOUNT KIT 7120 6153 LABEL WARNG 9135 0493 FILTER RFI Table 5 4 A1 Front Panel Board Replaceable Parts Ref Desig Agilent Part No Description ELECTRICAL PARTS 0160 5422 Capacitor 0 047 20 0160 4808 Capacitor 470pF 5 0160 4787 Capacitor 22pF 5 100V 0180 0155 Capacitor 2 2 20V 0160 5422 Capacitor 0 047 20 0160 4835 Capacitor 0 1uF 10 50V 0160 5422 Capacitor 0 047 20 0180 0155 Capacitor 2 2 20V 1906 0229 Diode 50 9140 0158 COIL IUH 10 1251 4927
124. eading program by pressing Eo Enter 6 Wait for 100 readings and then read the average measurement by pressing fi Enter Enter Record this as your result Verification 23 Table 2 6 Performance Test Record Form Test Facility Report No Date Customer Tested By Model Ambient Temperature C Serial No Relative Humidity 96 Options Nominal Line Frequency Hz Firmware Revision Special Notes Test Equipment Used Description Model No Trace No Cal Due Date 1 AC Source 2 DC Voltmeter 3 RMS Voltmeter 4 Oscilloscope 5 Electronic Load 6 Current Monitoring Shunt 24 Verification Table 2 7 Performance Test Record for Agilent Model 6680A MODEL Agilent Report No Test Description Maximum 222227 Voltage Programming and Readback Low Voltage OV Vou Front Panel Display Readback High Voltage 5 Vout Front Panel Display Readback Load Effect Source Effect PARD Ripple and Noise Peak to Peak RMS Transient Response Time at 900 us Constant l u uz ee Tests 5mV Vou 7 5mV 4 993V Vou 10mV V out 0 29mV V out 0 29mV 5mV Vou 7 5mV 5 007V Vout 10mV Vout 0 29mV Vout 0 29mV Constant Current Tests Current Programming and Readback Low Current OA Lu Front Panel Display Readback H
125. els 6682 6683A 6684A Only 09103 R910 1 FROM lt RECTIFIER _ 022 ANODE 1 EZ ES 2000 E1 2 Q4 R910 O i F ANV RO14 Oe 8 C911 R911 2 FROM O WN lt RECTIFIER 022 ANODE Z 1 2000 92502700 gt 49 4 RQ 1 re S NK M4 PL CRECTIFIER M2 Cp RIS O e CATHODE P R919 O Oo 0918 R912 2 FROM lt RECTIFIER R912 FO 9 ANODE Qd R916 O E4 Q4 R920 8 6 Q4 9 6 O lo E R913 4 FROM o ANN lt RECTIFIER O R917 Qo 022 ANODE 2000 CH 1 NOTES lt gt 1 UNLESS OTHERWISE SPECIFIED ALL RESISTOR VALUES ARE IN OHMS ALL CAPACITOR VALUES ARE IN MICROFARADS 2 DENOTES A COMPONENT VALUE CHANGE OR LOAD STATUS PER MO NUMBER THIS SCHEMATIC REPRESENTS THE 5 VOLT 6680 MODEL Figure 6 19 7 Snubber Board Component
126. ent One of the EEPROM storage locations holds a checksum value used to verify the integrity of this EEPROM data Access to the calibration data in the EEPROM is controlled by the combination of a password and jumper options on a header J3 located on the Al board see Post Repair Calibration in Chapter 3 The power supply can be calibrated manually using the front panel keys or via the GPIB bus with SCPI Standard Commands for Programmable Instruments commands The calibration procedure is in Appendix A of the Power Supply Operating Manual A10 Control Board The A10 Control Board contains the Secondary Interface CV CC Control Circuits Readback Circuits PWM Switching Circuits and OV Downprogramming Circuits These circuits are shown schematically in the 10 Control Board schematic Secondary Interface P O A10 Board These circuits are shown in detail on the 10 Control Board schematic and include the Secondary Microprocessor U506 Programmed GAL 0505 three DAC OpAmp circuits U510 U515 Readback Comparator circuits U516 0517 and OV Shunt DAC OpAmp circuit 0520 U521 82 Principles Of Operation The Secondary Microprocessor translates serial data received from 2 board into parallel 12 bit data The data bus is connected directly to the four DAC OpAmp circuits Under control of the lip the selected DAC converts the bus data into an analog signal The DAC reference circuit U503 U504 provides a 10V reference for t
127. ent is less than the programmed current the OR GATE signal goes high causing the output current to increase to the programmed value An externally applied dc signal IPROG can be used to program the output current A 0 volt to 5 volt IP level produces a proportional zero to full scale output current Switching Downprogramming Control P O A10 These circuits include a Ramp Generator Divider Deadtime Latch Fast Sense Differential Amplifier Pulse Width Modulator Summing Comparator Down Programmer Control and OV Comparator circuits The Divider Deadtime Latch 17600 0601 0602 divides the 2 MHz ALE signal from the Secondary uP and supplies 40 KHz pulses to the Ramp Generator U607 and ON Latch U604 The OR GATE signal CV or CC control signal as previously described is summed with the 40 KHz triangular waveform produced by the Ramp Generator An input from the Fast Sense Differential Amplifier is also summed to compensate for a sudden transient in the rectified output The width of the output pulses from the Summing Amplifier vary as the OR GATE control signal increases or decreases These pulses are applied to the Pulse Width Modulator U603 via the On Latch The PWM generates the square wave pulses that are applied to the A3 FET assembly to turn the FET switches on and off The Deadtime Latch resets the ON Latch to provide a minimum off time for the FET switches The OV circuit compares the output voltage level with the OVREF sign
128. erred to as system supplies Electrostatic Discharge The power supply has components that can be damaged by ESD electrostatic discharge Failure to CAUTION dn Observe standard antistatic practices can result in serious degradation of performance even when an actual failure does not occur When working on the power supply observe all standard antistatic work practices These include but are not limited to e working at a static free station such as a table covered with static dissipative laminate or with a conductive table mat Agilent P N 9300 0797 or equivalent e using a conductive wrist strap such as Agilent P N 9300 0969 or 9300 0970 e grounding all metal equipment at the station to a single common ground e connecting low impedance test equipment to static sensitive components only when those components have power applied to them e removing power from the power supply before removing or installing printed circuit boards Introduction 9 Verification Introduction This chapter provides test procedures for checking the operation of Agilent Series 668xA power supplies The required test equipment is specified and sample performance test record sheets are included Instructions are given for performing the tests either from the front panel or from a controller over the GPIB Tests Two types of procedures are provided Operation Verification tests and Performance tests Type of Test Purpose Operation Verif
129. f 90 days from date of delivery During the warranty period Agilent Technologies will at its option either repair or replace products which prove to be defective Agilent Technologies does not warrant that the operation of the software firmware or hardware shall be uninterrupted or error free For warranty service with the exception of warranty options this product must be returned to a service facility designated by Agilent Technologies Customer shall prepay shipping charges by and shall pay all duty and taxes for products returned to Agilent Technologies for warranty service Except for products returned to Customer from another country Agilent Technologies shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Agilent Technologies product price only if Customer pays Agilent Technologies international prices defined as destination local currency price or U S or Geneva Export price If Agilent Technologies is unable within a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental spe
130. g current to flow through power transformer T900 in one direction DRIVE2A pulses turn on the other set of RAIL Q304 Q344 and RAIL Q302 Q322 FETs causing current to flow through T900 in the opposite direction The FET on off periods are controlled by the duty cycle detect and the peak current detection circuits If the output attempts to change regulation is accomplished by the CV CC control circuits the 10 Control board These circuits vary the width of the drive pulses and the duration of the FET on off periods Principles Of Operation 85 TRANSFORMER CONNECTS TO ANOTHER IDENTICAL CIRCUIT TO COMPRISE 1ST STAGE RAIL 1ST STAGE H BRIDGE CONFIGURATION Figure 4 2 1ST Stage of the FET H Bridge Configuration Output Circuits The output circuits include the following circuits Chassis mounted components Two power transformers T900 T901 Two inductors L900 L901 Four rectifiers D900 through D903 Output capacitors 7 Snubber board mounted to the heat sink 8 Fast Sense board A9 Slow Downprogrammer board and output bus bars Each combination of power transformers T900 T901 and rectifiers D900 D903 couples the output pulses from the A3 FET board The output of each transformer rectifier combination is connected in parallel before being applied to the output filter The output filter assembly consists of bus bars with the filter capacitors bolted to them The fil
131. g the analog port for external voltage programming control Turn on tests including selftest errors and runtime errors Front panel operation SCPI programming an introduction to syntax language dictionary and status register operation Compatibility language programming for operation with Agilent Series 603xA power supplies e Replacement of line fuse and conversion of line voltage e Calibration procedure front panel and remote Manual Revisions This manual was written for power supplies that have the same serial prefixes first part as those listed on the title page and whose serial numbers second part are equal to or higher than those listed in the title page Note 1 Ifthe serial prefix of your supply is higher than that shown in the title page then the supply was made after the publication of this manual and may have hardware and or firmware differences not covered in the manual 2 Ifthey are significant to the operation and or servicing of the power supply those differences are documented in one or more Manual Changes sheets included with this manual These changes will also be incorporated in future editions of the manual 3 Ifthe serial prefix on the power supply is lower than that shown on the title page then the supply was made before the publication of this manual and can be different from that described here Such differences are covered in Appendix A Manual Backdating Changes Firmware Revisions The power
132. hat provides 5V with respect to earth ground for the primary interface circuits and the bias voltage for the front panel board circuits the LCD and the keypad The A2 Board also has a line or bias voltage detector IC U101 that generates a power clear signal PCLR This signal initializes certain primary interface and front panel circuits when normal ac line voltage is applied and also shuts these circuits down when the line voltage drops below the required minimum Front Panel Assembly The power supply Al Front Panel Assembly contains a circuit board keypad liquid crystal display LCD and the power on off switch The Front Panel Circuit Board Al contains microprocessor circuits microprocessor U3 and ROM U4 that decode and execute all front panel keypad commands These are transferred to the power supply output via the serial I O port to the A2 board GAL gated array logic IC and isolators and to the secondary interface circuits on the 10 Control Board The front panel microprocessor circuits also process power supply measurement and status data received from the serial I O port This data is displayed on the LCD IC EEPROM U6 electrically erasable programmable read only memory on the Al Front Panel Board stores data and configuration information This information includes calibration constants GPIB address the present programming language and model dependent data such as the minimum and maximum values of voltage and curr
133. have any difficulty in removing power supply components or boards contact the Agilent Technologies Support Line for help Shock Hazard Hazardous voltage can exist inside the power supply even after it has been turned off Check the INPUT RAIL LED 4 402 under the RFI shield see Figure 3 18 end of this section for LED location It the LED is on there is still hazardous voltage inside the supply Wait until the LED goes off approximately 7 minutes after power is removed before proceeding 72 Troubleshooting ASSY 133 EV seq A pZ 081 ssy 1ndul py 455 9140 CV Assy 20 GV ur1 hj Aeidsig Assy seg 9V ASSY Dd ued 10014 Assy 01007 oly sng 1ndino _ ASS MOIS awu e1601qUMO 6Y ASSY asuas 1524 Qv SH 3123 55 4 Jy Troubleshooting 73 Figure 3 18 Component Locations Top Cover and RFI Shield Removed 74 Troubleshooting N e 1 Te tO E Q 5 2 Blinder 5001 6794 Figure 3 19 5 Inch Front Panel Frame Assembly AC Switch 3101 3088 10008 78990 L0008 8990 0008 28990 0008 19990 0008 08990 5nqi dns 1601 04 0 5100 Ody 0041 0705 540103 Ody 722 0805 19901 6991 0906 podhay Z SE 0906 82d POdAay 780 000L MOPUIM 6 1906 Kojdsig G31 7 6 5 7 lt 60 06650 INN 1922 0906 8 40 80 0560 667 650 9
134. he CV and CC DACs and a 11 6V reference for the readback DAC Zener VR501 provides a 6 2V reference for the OV Shunt DAC The CV DAC OpAmp 0510 U513 converts the programmed voltage value from the bus or front panel into the CVPROG signal CVPROG is sent to the CV Error Amp and compared with the VMON signal to control the magnitude of the output voltage in the CV mode The range of CVPROG is 0 volts to 10 volts which corresponds to the zero to full scale output voltage range of the supply The CC DAC OpAmp 0511 0514 converts the programmed current value from the bus or front panel into the CCPROG signal CCPROG is sent to the CC Error Amp and is compared with the IMON signal to control the magnitude of the output current in the CC mode The range of CCPROG is 0 volts to 10 volts which corresponds to the zero to full scale output current range of the supply The Readback Comparators U516 U517 operate with the Readback DAC OpAmp 0512 U515 to return the following signals to the uP The monitored output voltage VMON The monitored output current IMON The ambient temperature AMB SENSE The programmed voltage value CVPROG The programmed current value CCPROG The fan detector FAN DEW The readback DAC circuit is controlled by the UP to successively approximate to 12 bit resolution the value of each signal monitored The CVPROG and CCPROG signals are used during selftest to check DAC OpAmp operation The uP monitors the f
135. her the date of manufacture or of a significant design change The last four digits are a sequential number assigned to each instrument Item Description MY The first two letters indicates the country of manufacture where US USA MY Malaysia SG Singapore 4100 This is a code that identifies either the date of manufacture or the date of a significant design change 0101 The last four digits are a unique number assigned to each power supply Older serial number formats used with these instruments had a two part serial number i e 2701A 00101 This manual also applies to instruments with these older serial number formats Refer to Appendix A for backdating information Introduction 7 Related Documents Change Sheet There may or may not be a Manual Change sheet included with this manual see Manual Revisions If one is included be sure to examine it for changes to this manual Operating Manual Each power supply is shipped with an operating manual see Replaceable Parts Chapter 5 for part numbers that covers the following topics Options accessories specifications supplementary characteristics output characteristic curve typical output impedance curves Connecting the power cord load and remote sensing Connecting power supplies in series or autoparallel Connecting the remote controller and setting the GPIB address Configuring the digital port for remote inhibit relay link or digital I O operation Connectin
136. ibration data 1720 DATA 4 4 4 4 4 4 4 4 1 1730 1740 RESTORE Fact cal sour 1750 FOR I 1 TO 9 1760 READ Cal sour addr I 17700 NEXTI 1780 1790 RESTORE Fact cal dest 1800 FOR I 1 T09 1810 READ Cal dest addr I 1820 NEXTI 1830 1840 RESTORE Fact cal len 1850 FOR I 1 T09 1860 READ Cal length T 1870 1880 1800 FOR I 1 TO 9 Locations of good data 1900 OUTPUT QGPs DIAG EEPR Cal sour addr D Cal length I Read good data 1910 ENTER Ps Cal_data Enter good data 1920 OUTPUT QGPs DIAG EEPR Cal dest addr I Cal length D Cal data Write good data to factory preset locations 1930 1940 1950 1960 Cal off 1970 CLEAR SCREEN 1980 OUTPUT Ps CAL STATE OFF Turn off cal mode 1990 2000 GOSUB Ps error Check for errors Figure 3 17 Initialization and Factory Preset Replacement Program Listing Sheet 4 of 5 Troubleshooting 67 IF Err THEN PRINT An error occurred during the EEPROM read write Check for PRINT programming errors Initialization data may be incorrect STOP END IF PRINT Operation complete Program stopped STOP Ps error Error handling subroutine OUTPUT Ps SYST ERR Check for errors ENTER Ps Err RETURN END Figure 3 17 Initialization and Factory Preset Replacement Program Listing Sheet 5 of 5 Disassembly Procedures Shock Hazard To avoid the possibility of personal injury remove the
137. ication These tests do not check all parameters but comprise a short procedure to verify that the power supply is performing properly Performance These tests verify all the Specifications not Supplementary Characteristics listed in Table 1 1 of the Power Supply Operating Manual If you encounter failures or out of specification test results see Troubleshooting Procedures Chapter 3 The procedures will determine if repair and or calibration is required Note The power supply must pass the selftest at power on before the following tests can be performed If the power supply fails selftest go to Chapter 3 Test Equipment Required List of Equipment Table 2 1 lists the equipment required to perform the tests given in this chapter Only the equipment marked with the superscript is needed for the Operation Verification test Current Monitoring Resistor The four terminal current monitoring resistor current shunt listed in Table 2 1 is required to eliminate output current measurement error caused by voltage drops in leads and connections The specified current shunts have special current monitoring terminals inside the load connection terminals The accuracy of the current shunt must be 0 04 or better When using the 1000 amp 0 05 current shunt the measurement uncertainty should be stated for all calibrations Connect the current monitor directly to these current monitoring terminals Verification 11 Table 2 1 Test Equipment Req
138. igh Current 875A Tout Front Panel Display Readback Load Effect Source Effect 450mA Tout 600mA 873 675 Lu 1475mA Tour 108 75mA Ij 108 75mA 450mA Tour 600mA 876 325A La 1 475mA Tour 108 75mA Tour 108 75mA Enter your test results in this column Verification 25 Table 2 7 Performance Test Record for Agilent Model 6681A MODEL Agilent Report No Test Description Maximum Spec Constant Voltage Tests Voltage Programming and Readback Low Voltage OV Vou 8mV 8mV Front Panel Display Readback Vout 12mV Vout 12mV High Voltage 8V Vout 7 9888 V 8 0112V Front Panel Display Readback Vout 16mV Vout 16mV Load Effect Vout 0 46mV Vou 0 46mV Source Effect Vout 0 46m V Vout 0 46mV PARD Ripple and Noise Peak to Peak RMS Transient Response Time at 900 us Current Programming and Readback Low Current OA I 300mA 300mA Front Panel Display Readback Tour 400mA Tour 400mA High Current 580A Tout 579 120 580 880A Front Panel Display Readback Tour 980mA Tour 980mA Load Effect Tout 69mA Tour 6 Source Effect Tout 69mA Tour 69mA Enter your test results in this column 26 Verification Table 2 7 Performance Test Record for Agilent Model 6682 MODEL Agilent Report No Test Description Maximum 222227 GP Constant l u uz ee Tests Voltage Programming and Readback Low Voltage OV Vou 21mV 21mV Front Panel Display Rea
139. interface testing isse t ER EN RE 33 sense terminals o ain e En ee eiut ee 13 Serial BUIDDGE zit SR caste chase HO OI Sacto ened E ees 7 serial 7 settling time RENAL A pa sue 13 Signal name 140 Signals 5V bias voltate ie ERR PARERE RT ERE 140 140 140 RESET 140 RD 140 Nue eects 140 SRK 140 a a aun Dai dn Recte aka us ma ed 140 aaa qanpa a anaq 140 13 test M anys Sette 11 test equipment troubleshooting nee ea re reu amit nde 33 iurc EE ET 35 testileads stato etch ost Sata Selecta op UR t au ivit ttum amupas ales ef 13 testameasurements cc mode eco toe she beet e oe tm ve 19 test
140. ith power supplied to the instrument while its protective covers are removed If contacted the energy available at many points may result in personal injury Any adjustment maintenance and repair of this instrument while it is opened and under voltage should be avoided as much as possible When this is unavoidable such adjustment maintenance and repair should be carried out only by a skilled person who is aware of the hazard involved Capacitors inside this instrument may hold a hazardous electrical charge even if the instrument has been disconnected from its power source SAFETY SYMBOLS Instruction manual symbol The instrument will be marked with this symbol when it is necessary for you to refer to the A instruction manual in order to protect against damage to the instrument E This sign indicates hazardous voltages This sign indicates earth terminal sometimes used in the manual to indicate circuit common connected to a ground or chassis The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met The CAUTION sign denotes a hazard It calls attention to an operating procedure or the like which if not correctly CAUTION performed or adhered to could result in damage to or destruction of part or all of the pr
141. ject to change whenever the firmware is updated 56 Troubleshooting Test Headers The power supply has two test headers as shown in Figure 3 15 each with a jumper that can be moved to different positions for SA testing and for other functions To gain access to the headers remove the power supply top cover Description Primary Interface Test Connector A2J106 Systems Supplies Only 7 and 8 FLT INH Normal operating and storage position DIG CNTL port is configured for fault indicator FLT output and remote inhibit RI input 1 and 2 SA Mode Install jumper here for SA mode 3 and 4 DIG I O Install jumper here to configure DIG CNTL port for digital I O operation 5 and 6 RELAY LINK Install jumper here to configure DIG CNTL port for control of external relay accessories See Appendix D in power supply Operating Manual for information about the digital control port Front Panel Test Connector A1J3 7 and 8 NORM Normal operating and storage position of jumper 1 and 2 SA Mode Install jumper here for SA mode 3 and 4 INHIBIT CAL Install jumper here to disable calibration commands and prohibit calibration 5 and 6 FACTORY PRESET CAL Install jumper here to restore original factory calibration constants TEST HEADER ON A2 GPIB BOARD TEST HEADER ON 668 1 FRONT PANEL BOARD J106 s J3 SA MODE gt 1 O 2 sa MODE gt 110o O 2 DIGUO 3 O Ola NMHIBIT 3 O 014 RELAY LINK 5 O Ole FACT
142. l scale value see Table 2 2 4 Adjust the load to produce full scale current see Table 2 2 as shown on CV annunciator is on If it is not adjust the front panel display the load to slightly reduce the output current until the annunciator comes on 5 Adjust the transformer to decrease the ac input voltage to the low line condition 174Vac or 191 Vac Record the output voltage reading of the DVM 6 Adjust the transformer to increase the ac input voltage to the high line condition 220Vac or 250Vac Record the output voltage reading on the DVM 7 Check test result The difference between the DVM readings in steps 5 and 6 are within the specified Source Effect limits CV Noise PARD Periodic and random deviations PARD in the output ripple and noise combine to produce a residual ac voltage superimposed on the dc output voltage This test measures CV PARD specified as the rms and peak to peak output voltages over the frequency range of 20Hz to 20MHz 1 Turn off the power supply and connect an a c coupled oscilloscope across the and output terminals see Fig 2 1 Set the oscilloscope bandwidth limit to 20MHz 30MHz for the Agilent 54504A and use an RF tip on the oscilloscope probe 2 Turn on the power supply and program the current to its maximum programmable value and the voltage to its full scale value see Table 2 2 3 Adjust the load to produce full scale current see Table 2 2 as shown on CV annunciator is on If it
143. later If you should have trouble later in determining which cable goes to which connector during reinstallation refer to the cabling diagram in Chapter 6 A3 FET Board Follow this procedure to remove the A3 FET Board Remove the four 4 holding screws that secure the two black caps over the Rectifier HS assembly Once these caps are removed you can remove the Rectifier HS which faces the A3 FET Board Disconnect two connectors P430 and P431 at the A5 DC RAIL assembly Disconnect two connectors P O cable assemblies P N 5080 2283 at the A5 DC RAIL assembly You can now lift out the A3 FET board and remove unsolder any other wires necessary to fully remove the A3 board og p ps 70 Troubleshooting 10 Control Assembly Disconnect the cables from the following connectors at the 10 DC RAIL board 1 Disconnect the ribbon cable going from to the 6 Bias board This cable connects to J509 on the A10 board but it is easier to disconnect it at the A6 Bias Board 2 Disconnect cables from connector 1507 phone and connectors J510 J511 J512 and 1513 on the A10 Control Board 3 Atrear of power supply remove holding screw directly above fan This screw holds the frame and A10 control board in place 4 Atrear of power supply unplug connector DIG CNTL from A10 Control Board 5 Move board to the right and lift board and associated steel frame out of chassis Front Panel Assembly 1 Peel off vinyl trim one strip on each side of f
144. le Parts Note This LED Board is only used on earlier version Agilent 668xA models Refer to Appendix A Backdating change 10 for more information Ref Desig Agilent Part No ELECTRICAL PARTS C450 0180 4132 CAP 6 8uF 35V C451 0160 4808 CAP 470pF 5 D450 451 452 453 1901 1098 DIO 1N4150 R450 0698 3444 RES 316 1 125W R451 0757 0401 RES 100 1 125W R452 0698 3156 RES 14 7K 1 R453 0698 8827 RES IM 1 125W R454 0698 3156 RES 14 7K 1 R455 0757 0280 RES IK 1 125W U450 1858 0076 XSTR ARY 14P DIP 0451 1858 0077 XSTR ARY 14P DIP 7450 1902 0562 DIO ZNR 22 1 5 MECHANICAL PARTS 5080 2281 CABLE LINE SWITCH Ref E456 E457 to 51 5080 2283 CABLE LED AC INPUT Ref E450 E451 to DC RAIL J440 5080 2286 CABLE DEW S1 CONNECTION Ref E452 E455 to DC RAIL J441 94 Replaceable Parts Table 5 6 2 GPIB Board Replaceable Parts see Note Ref Desig Agilent Part No ELECTRICAL PARTS C122 0180 4606 Capacitor 10 000uF C128 0160 4281 Capacitor 2 200pF F101 2110 0699 Fuse Subminature 5AM J101 1252 2320 Connector Receptacle GPIB J106 1251 4926 Connector Receptacle Test Header J107 108 114 115 1251 7330 Connector Receptacle P101 1251 4245 Connector Plug 2 pin AC Bias 0110 0111 1990 0444 Optoisolator 0113 1990 0543 IC Optoisolator 0117 1820 2549 IC Optoisolator U118 1820 4185 IC Optoisolator U121 1820 0430 IC Voltage regulator 101 0360 2312 Terminal Block Digital Control MECHANICAL PARTS 1205
145. ly See Warning note above Note The following procedures describe the removal of most of the circuit boards within the power supply Once the GPIB board is removed you will have access to the 4 AC Input Assembly and the 5 DC Rail Assembly Similarly once the 10 control board is removed along with the Rectifier HS you will have access to other components and boards within the supply It is recommended that when you disconnect any wires and or cable connectors you should immediately label them to simplify their reinstallation later GPIB Board To remove the GPIB board disconnect the cables from the following connectors at the GPIB board Disconnect the cable going to connector P101 Disconnect phone cable going to J107 Disconnect phone cable going to J107 Disconnect phone cable going to J108 Remove two 2 holding screws at read of chassis holding GPIB board in place Using a 7 mm driver remove the two 2 screws holding the GPIB connector at rear of chassis The GPIB board can now be lifted out from the chassis ION tS i Troubleshooting 69 4 Input Assembly To remove the 4 AC Input Board first remove the GPIB board then disconnect these cables from the following connectors at the GPIB board 1 Disconnect the cables going to connector J417 and J420 2 Disconnect the cable going to connector J419 Remove the three 3 fuse assemblies inside rear of power supply to free the wires going to E400 E40
146. nt panel board and slide left to release board from the Al Front Panel Assembly and remove board Troubleshooting 71 A1DSP1 LCD Display 1 Remove the Al Front Panel Board as described in that procedure 2 Remove the nuts securing the LCD display to the front panel assembly and remove the LCD and attached ribbon cable see CAUTION below When reinstalling this cable be sure to line up the cable stripe over the LCD connector pin marked with a square CAUTION The display connector is fragile When removing the cable from the LCD display carefully rock the cable connector back and forth while gently pulling it back A1G1 and A1G2 Rotary Controls 1 Remove the Al Front Panel Board as described in that procedure 2 Remove the and AIG2 cables from connectors A1J4 and 115 3 Remove nuts securing the AIGI AIG2 controls to the board and remove controls A1KPD Keypad 1 Remove the A1 Front Panel Board as described in that procedure 2 With board removed keypad can easily be lifted out of the Front Panel Assembly Output Bus Boards A7 A81 and A9 amp Chassis Components Note To remove the A7 Snubber Board A8 Fast Sense Assembly A9 Downprogrammer and other chassis mounted components first remove the A10 Control Board frame assembly and the two Rectifier Heat Sinks described earlier Once the heat sinks are removed you will have access to the A7 A8 and A9 boards as well as other chassis mounted components Should you
147. odels Refer to Appendix A Backdating change 10 for more information Figure 6 5 LED Board Component and Test Point Location FROM J440 4 DC RAIL BD FROM 2441 4 DC RAIL BD CWH BK gt 450 CWH RED E451 CWH BRN E452 CHHZRED 4 568 CWH OR gt 454 CHHZYEL gt E4550 0450 3 3 i 0450 MPa2907P i C450 ME TK URASO R450 176 aeu 216 55 5 a MPQ2907P Z2N DS450 an C451 R453 1 1M 420PF 19V 0451 4 4e 2 gt R454 MPaeaeep 3 14 7K bd 1 WH __ E456 SPARES GATES 0450 0450 10 5 IO LINE SWITCH 3 pe 8 2 S 15 457 MPQ2907P MPQ2907P Figure 6 6 LED Board Schematic Diagram R451 215 R452 14 7K R455 1K
148. oduct Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met Safety Symbol Definitions Symbol Symbol Direct current Terminal for Line conductor on permanent y installed equipment Alternating current Caution risk of electric shock A g Both direct and alternating current AN Caution hot surface Three phase alternating current Caution refer to accompanying documents BAI Earth ground terminal In position of a bistable push control Out position of a bi stable push control Protective earth ground terminal Intended for connection to external protective conductor Frame or chassis terminal On supply Terminal for Neutral conductor on Off supply permanently installed equipment Terminal is at earth potential Standby supply Used for measurement and control 9 Units with this symbol are not completely circuits designed to be operated with disconnected from ac mains when this switch is one terminal at earth potential off To completely disconnect the unit from ac mains either disconnect the power cord or have qualified electrician install an external switch Printing History The edition and current revision of this manual are indicated below Reprints of this manual containing minor corrections and updates may have the same printing date Revised editions are identified by a new printing date A revised edition incorporates all new or corrected materi
149. ontinue holding down the for 2 seconds and wait until the PWR ON INIT indicator goes off The power supply is now on without executing power on selftest BO gl Using the TST Query GPIB Systems Supplies Only You can get the power supply to execute a partial selftest by sending it the GPIB TST query command Table 3 2 shows the tests that are performed in response to this command These tests do not interfere with normal operation or cause the output to change The command returns a value of 0 if all tests pass Otherwise the command returns the error code of the first test that failed No error codes are displayed on the front panel and the power supply will attempt to continue normal operation 32 Troubleshooting Code and or Message EI FP RAM E2 FP ROM EE CHKSM E4 PRI XRAM 5 PRI IRAM E6 PRI ROM E7 GPIB 8 SEC RAM E9 SEC ROM E10 SEC 5V E11 TEMP E12 DACS Table 3 2 Selftest Error Codes Messages Description Front panel RAM test failed power on Front panel ROM test failed power on and TST Front panel EEPROM checksum test failed power on and TST Primary interface external RAM test failed power on Primary interface internal RAM test failed power on Primary interface ROM test failed power on and TST GPIB interface test failed power on Secondary interface RAM test failed power on Secondary interface ROM test failed power on and TST Secondary inte
150. pect to E207 E307 common test point on A3 FET Board schematic diagram 6 Check bias voltage at U203 1 U303 1 HR 7 While adjusting the external 15V supply input check the bias trip point at Voltage goes from low 0V to high U204 1 U304 1 5V at an input of approximately 12V and from high to low at an input of approximately 13V Set external supply input to 15V and check drive 1 waveform at See Figure 3 14B U201 10 U301 10 and drive 2 waveform at U201 12 U301 12 80 Check that pulses are present at U201 1 U201 7 U301 7 and See Figure 3 14C U302 1 U202 1 U202 7 U302 7 10 Pulses should be present on both sides of inductors L201 204 L301 304 and L213 216 or L313 316 as follows Check the pulses on the driver transistor side 0251 0254 0351 0354 of each See Figure 3 14D inductor Check the pulses on the FET regulator side Q201 Q204 Q301 Q304 Q211 Q311 See Figure 3 14E Q222 Q322 Q233 Q333 and Q244 Q344 of each inductor If the waveforms do not have the fast step as shown in Figure 3 14 then the associated FET gate input has an open circuit 11 Measure the VREF voltage at U205 2 1 7 Check the peak current limit by connecting 68KQ resistor from 5V 0201 9 to All pulses turn off U205 3 or 0304 5 54 Troubleshooting Edo ep popu Lp p Espera EE Ex M ES WER A IN E NIV A E208 E209 INPUT DRIVE TEST SIGNAL U201 U202 U301 U302 PINS 10
151. r of the cover and then pull the cover backwards towards the rear of the power supply to disengage it from the front panel Shock Hazard Hazardous voltage can exist inside the power supply even after it has been turned off Check the INPUT RAIL LED 4 402 under the RFI shield see Figure 3 18 end of this section for LED location If the LED is on there is still hazardous voltage inside the supply Wait until the LED goes off approximately 7 minutes after power is removed before proceeding Removing Protective RFI Shield Galvanized Sheet Metal Once you remove the top cover of the power supply you will see the RFI galvanized sheet metal cover preventing the power supply from emanating RFI fields The RFI shield covers most components and circuit boards as well as many of the chassis mounted components You must remove this shield in order to gain access to the inside of the power supply Remove the shield as follows 1 There are approximately 21 screws holding the cover to the frame 2 There are two screws at the top of the shield that secure a retaining clip for the GPIB board You do not need to remove these screws simply loosen the screws and slide the GPIB retaining clip backwards free of the GPIB board 3 Remove all shield securing screws using a TORX T 15 screwdriver and save for later reinstallation 4 Lift the RF shield out of the chassis 5 When DC RAIL LEDs are extinguished it is safe to work inside the power supp
152. rface 5 volt readback test failed power on and TST Ambient temperature readback test failed power on and TST CV or CC DAC tests failed power on Probable Cause Selftest Error Codes Messages Microprocessor AIU3 ROM AIU4 or address latches AIUS Possibly due to power loss during a write operation See Checksum Errors in Chapter 3 of Operating Manual If power loss is not the problem EEPROM A1U6 could be defective If you replace AIU6 the power supply must be reinitialized and calibrated RAM A2U108 Microprocessor A2U114 ROM A2U106 Talker listener A2U117 Microprocessor 100506 Microprocessor AI0U506 Comparators AI0U516 100517 readback DAC A10U512 U515 or secondary bias supply 5Vs A4U304 Thermistor AIORT500 or comparator 100517 CV DAC Al0U510 U513 or CC DAC A10U511 U514 see Figure 3 7 NOTE The following error messages can appear due to a failure occurring either while the power supply is operating or during selftest SERIAL TIMOUT SERIAL DOWN UART PARITY UART FRAMING UART OVERRUN SBUF OVERRUN SBUF FULL EE WRITE ERR SECONDARY DN Serial data line failure on A2 board Serial data line failure on A2 board UART failed UART failed UART failed Serial buffer failure UART Serial buffer failure EEPROM write failure Serial data line failure on Main board See Figure 3 10 system or Figure 3 11 bench See Figure 3 10 system or Figure 3 11 bench UART A2U112 UA
153. ront panel to access the four screws that secure the front panel assembly to the chassis Remove the four screws two on each side using a size T 10 TORX Disconnect phone cable W5 from J6 on the A1 Front Panel Board Record the color code and the location of each of the four wires connected to line switch S1 Disconnect the wires from the switch assembly Remove the front panel assembly Mi 81 Line Switch 1 Remove Front Panel Assembly and disconnect switch wires as described in that procedure 2 Release the switch locking tabs by pressing them inward against the body of the switch and removing the switch A1 Front Panel Board 1 Remove the Front Panel Assembly and disconnect the switch as described under Front Panel Assembly 2 Disconnect LCD display ribbon cable W2 from J2 on the A1 Front Panel Board Note When reinstalling the LCD ribbon cable be sure to line up the stripe of the ribbon cable with pin 1 on J2 3 Useasmall Allen wrench 0 050 to loosen the set screws that are inset in the knobs These are the and AIG2 Voltage Current control shafts that extend through the front panel Remove knobs and shaft bushings Note Be careful not to unscrew the knob set screws too far out as they can easily fall out of the knob and become lost 4 Remove screw if installed that secures board to the Front Panel Assembly The screw is located near J4 on the Front Panel Board 5 Lift tab near J6 on fro
154. s an incorrect signal but the signal source output of the previous is correct then look for an open printed circuit track or soldering problems 6 Ifthe output signature of an IC is incorrect it could be caused by that IC However it could also be caused by a short at another component that is connected to that output mU Firmware Revisions Each signature analysis table in this chapter shows the power supply firmware revision for which the table 1s valid If needed for a Bench Supply you can confirm the firmware revision of your power supply by checking the label on the Front panel ROM AIU3 and on the Secondary microprocessor ASUS04 You can obtain the revisions on a Systems Supply with the GPIB IDN query command The following sample Agilent BASIC program does this 10 ALLOCATE L 52 20 OUTPUT 705 IDN2 30 ENTER 705 L 40 DISP L 50 END For a typical Model 6681A the controller will return a string with four comma separated fields as follows Agilent Technologies 6681A 0 fA 01 05sA 01 04pA 01 02 The first three fields in the string are the manufacturer model number and 0 The last field gives the firmware information as follows f front panel firmware revision A 01 05 s secondary interface firmware revision A 01 04 primary interface firmware revision 01 02 Note The firmware revisions numbers shown here may not match the firmware revision of your instrument Firmware revision numbers are sub
155. supply s firmware resides in the A10 control board microprocessor chip and in ROM chips on the A2 GPIB and 1 Front Panel boards You can obtain the firmware revision number by either reading the integrated circuit label or query the power supply using the GPIB IDN query command see Chapter 3 Troubleshooting Also see Chapter 3 Firmware Revisions for the actual Agilent BASIC program that does this 8 Introduction Safety Considerations This power supply is a Safety Class I instrument which means it has a protective earth terminal This terminal must be connected to earth ground through a power source equipped with a 4 wire ground receptacle Refer to the Safety Summary page at the beginning of this manual for general safety information Before operation or repair check the power supply and review this manual for safety warnings and instructions Safety warnings for specific procedures are located at appropriate places in the manual Hazardous voltage exist within the power supply chassis at the output terminals and at the analog programming terminals Conventions e In diagrams the name of a complementary signal is sometimes shown with a bar above the signal mnemonic In other diagrams and in the text complementary signals are shown with an asterisk after the mnemonic such as PCLR A mnemonic with a bar over it or an asterisk after it represents the same signal e In this manual all Agilent 668xA series supplies are ref
156. t be in CC mode for all CC tests Figure 2 3 CC Load Effect Test Setup 22 Verification Averaging the Measurements The CC Load Effect and CC Source Effect tests measure the dc regulation of the power supply s output current When doing these tests you must be sure that the readings taken are truly dc regulation values and not instantaneous ac peaks of the output current ripple You can do this by making each measurement several times and then using the average of the measurements as your test value Voltmeters such as the Agilent 3458A System Voltmeter can be programmed to take just such statistical average readings as required by these tests The following steps show how to set up the voltmeter from its front panel to take a statistical average of 100 readings represents the unlabeled shift key in the FUNCTION RANGE group 1 Program 10 power line cycles per sample by pressing 1 0 Enter 2 Program 100 samples per trigger by pressing 0 S Enter 3 Setup voltmeter to take measurements in the statistical mode as follows a Press CO 9 b Press amp until MATH function is selected then press 5 c Press 4 until STAT function is selected then press Enter 4 Now set up voltmeter to read the average of the measurements as follows a Press CO C b Press v until RMATH function is selected then press Enter c Press amp until MEAN function is selected then press 5 Execute the average r
157. t numbers A Bench Series Supply can be initialized and the new Factory Preset calibration constants loaded by temporarily replacing the A2 Isolator board with an A2 GPIB board Then follow the instructions above for EEPROM INITIALIZATION and also TRANSFERRING CALIBRATION CONSTANTS TO THE FACTORY PRESET LOCATIONS described above After the supply has been Initialized Calibrated and the new Factory Presets stored remove the GPIB board and reinstall the original Isolator board Troubleshooting 63 Program to initialize EPROM or move factory preset data in 668xA power supplies RE STORE INIT_668X Rev A 00 00 dated 09 Nov 1993 DIM Init_data 1 49 Model 5 Idn 21 Cal_data 40 INTEGER Addr 1 49 Length 1 49 ASSIGN Ps TO 705 Supply must be at address 705 CLEAR SCREEN 110 Eprom_data_addr Data address 120 DATA 2 6 10 14 18 19 20 24 28 32 130 DATA 36 37 38 42 46 50 54 55 56 57 DATA 64 68 72 76 80 116 152 153 154 155 DATA 156 158 160 162 163 164 165 166 167 168 DATA 169 170 171 172 174 176 180 184 188 180 Eprom_data_len Data for word length DATA 4 4 4 4 1 1 4 4 4 4 DATA 1 1 4 4 4 4 1 1 1 1 DATA 4 4 4 4 4 1 1 1 1 1 DATA 2 2 2 1 1 1 1 1 1 1 DATA 1 1 1 2 1 4 4 4 4 250 Eprom data 6680 EEPROM data for 6680A DATA 729 71 5 125 0 83 0 4 235 72 895 0 DATA 98 3 36 17 6 25 0 83 255 20 10 DATA 6680 708 94 4 13 92 128 5 255 0 0 DATA 1296 6680 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 002701 2 0017346 10 2286 31
158. t14 6 NO SIGNAL OK CHECK FOR ANY ACTIVITY PULSES ON DATA AND ADORESS UNES TO INDICATE THAT PRIMARY MICROPROCESSOR A2U114 IS OPERATING CHECK FOR THE PRESENCE OF CLOCK PULSES AT THE FOLLOWING CIRCUT POINTS ON THE 2 GPIB BOARD GO TO SHEET 2 Figure 3 10 Serial Do 48 Troubleshooting CHECK A3A13 CHECK 2 01 CHECK A2C107 8 10114 Y101 CHECK 2014 U16 1 06 108 120 USE CHECK FOR UNES SHORTED TO 5V OR COMMON NO SHORTED LINES ARE FOUND REPLACE A2U114 SEE NOTE 2 NOTES 1 IF SECONDARY APPEARS ON THE DISPLAY FIRST AND THEN SERIAL DOWN IS DISPLAYED GO TO FIGURE 3 6 2 IF THIS DOES NOT FIX THE PROBLEM REPLACING THE 2 GPIB BOARD MAY BE THE MOST COST EFFECTIVE SOLUTION SYSTEMS POWER SUPPUES ONLY wn Troubleshooting Sheet 1 of 2 6MHz CLK PULSES AT A2U119 1 YES CHECK A2U112 0117 0119 CHECK FOR PRESENCE OF PULSES AT THE FOLLOWING CIRCUIT POINTS ON THE 2 GPIB BOARD SEE FIG 64 CHECK 420120 Ut12 CHECK A2U112 0119 CHECK A2U119 Figure 3 10 Serial Down Troubleshooting Sheet 2 of 2 Troubleshooting 49 START SECONDARY DOWN DISPLAY READS SECONDARY DN TURN OFF SUPPLY AND REMOVE TOP COVER TURN ON SUPPLY AND CHECK FOR SERIAL DATA PULSES AT 21 10 8 TEST POINT 5 WITH RESPECT TO PRIMARY GROUND 1 SEE TABLE 6 3 PULSES A2UA10 87 CHECK 2110 919 5 CHECK FOR 5V AT A
159. ter chokes L902 through L906 consist of ferrite cores enclosing the bus bar The current sense resistor R900 15 part of the positive output bus bar 86 Principles Of Operation 51 EUM EUM d NE 133 NYHI xnv auvos W110 xND 5 3 4 340 NO 55 13NVd 1NOH3 3 Figure 4 3 Agilent Series 668xA Power Supply Block Diagram Principles Of Operation 87 Replaceable Parts INTRODUCTION Chapter Organization This section lists the replaceable electrical and mechanical parts for the Agilent 668xA series power supplies Component location diagrams are located in Chapter 6 The lists consist of tables organized by assemblies as follows Assembly Main chassis Al Front Panel EBoard A2 GPIB Board A3 FET Board A4 AC Input Board 5 DC Rail Board A6 Bias Board A7 Snubber Board 8 Fast Sense Board A9 Down Programming Slow Sense Board 10 Control Board Table 5 3 Table 5 4 Table 5 6 Table 5 7 Table 5 8 Table 5 9 Table 5 9 Table 5 9 Table 5 9 Table 5 11 Table 5 10 The locations of circuit board assemblies and chassis mounted components are shown in Fig 3 20 Reading the Tables Each table lists electrical components alphabetically by reference designator and provides the Agilent part number followed by the part description Mechanic
160. the annunciator comes on Observe the DVM reading Divide this by the resistance of the current You may want to use an averaged monitoring resistor to obtain the output current Record the result reading for this measurement Program the Electronic Load input to 3 volts or short the Electronic Load You may want to use averaged reading input and repeat Step 5 for this measurement Check the result The difference between the current readings taken in Step 5 and Step 6 must be within specified Load Effect limits see Table 2 2 20 Verification Table 2 5 Constant Current Tests continued CC Source Effect This test measures the change in output current resulting from a change in ac line voltage from its minimum to its maximum value within the line voltage specifications It is recommended that you use averaged readings for Steps 6 and 8 of this test see Averaging AC Measurements at the end of this chapter Turn off the power supply and connect the ac power input through a variable voltage transformer Set the transformer to the nominal ac line voltage Connect the DVM across the current monitoring resistor see Fig 2 3 Turn on the power supply and program the current to its full scale value and the voltage to its maximum programmable value see Table 2 2 Set the Electronic Load to CV mode and its voltage to full scale Adjust the transformer to decrease the ac input voltage to the low line condition 180V
161. tre eo b 11 11 Test Equipment Required ouo leap toe le Peso 11 Eist of com e tad ee 11 Current Monitoring 11 Electronic e 12 Programming Fhe 13 General 8 2 URS E E 13 u h 13 General Measurement Techniques 13 Performance Test Record Sheets 13 Operation Verification Tests 14 Perforinance E ei 14 ConstantiVollape RE 14 RAN 14 4 6 14 Constant Current CEY ru EES ERE GGG E 19 Test S CUP 4 on a Ya SESAO 19 19 Averaging th CC Measurements te ede 23 31
162. tzation 2226 e cete aeo ee ree e et RO rm d pe onm or 115 General Schematic Notes np gets del Gate anon 119 hrunppurt 149 Index aa MM EES 155 Introduction Scope Organization This manual contains information for troubleshooting and repairing to the component level Agilent Series 668xA 5 kilowatt power supplies The remaining chapters of this manual are organized as follows Chapter Description Chapter 2 Verification procedures to determine the performance level of the supply either before or after repair Chapter 3 Troubleshooting procedures for isolating a problem procedures for replacing the defective component and if required post repair calibration and EEPROM initialization procedures Chapter 4 Principles of power supply operation on a block diagram level Chapter 5 Replaceable parts including parts ordering information Chapter 6 Diagrams including schematics component location drawings and troubleshooting test points Appendix A Backdating information for power supplies with serial numbers below those listed in the title page of this manual Instrument Identification Agilent Technologies instruments are identified by a 10 digit serial number The format is described as follows first two letters indicate the country of manufacture The next four digits are a code that identify eit
163. uired Type Required Characteristics Recommended Model Digital Voltmeter Resolution 10 nV Agilent 3458A Readout 8 1 2 digits Accuracy 20 ppm Current Monitor Resistor Agilent 6682A 6683A Agilent 6684 Guildline 9230 300 0 001 2 0 0496 300A 100W Agilent 6680A 6681A Burster Type 1280 100 uQ 0 05 1000A DC Power Supply DC Power Source with current capability Agilent 6680A equal to UUT Electronic Load Range Voltage and current range must 3 each Agilent 6050A w 3 each exceed that of supply under test Power Agilent 60504B per Agilent 6050A 5 4KW minimum for all units Resistor Load 5 Kilowatt minimum Agilent 6680A 5 7 milliohms 4375W Agilent 6681A 13 8 milliohms 4640W Agilent 6682A 87 5 milliohms 5040W Agilent 6683A 200 milliohms 5120W Agilent 6684A 312 milliohms 5120W Oscilloscope Sensitivity Agilent 54504A Bandwidth Limit 20MHz Probe 1 1 with RF tip RMS Voltmeter True RMS Bandwidth 20MHz Agilent 3400B Sensitivity 100 LV 0 1Volt per ampere 1Hz to 20MHz Pearson Model 411 Variable Voltage Power 3 Phase 24K VA Range Superior Powerstat Transformer AC Source 180 235V 47 63Hz 360 440V 1156DT 3Y 0 280V 50A 47 63Hz 24 2 or equivalent GPIB Controller Full GPIB capabilities HP Series 200 300 Required for Operation Verification Tests Required for remote testing of 668xA models Electronic Load Many of the test procedures require the use of
164. us Annunciators Troubleshooting When troubleshooting the CV CC status annunciators or status readback circuits first measure the voltage drop across the gating diodes which are AIOD651 for the CC circuit and Al0D652 for the CV circuit see A10 Sheet 2 A conducting diode indicates an active ON control circuit This forward drop is applied to the input of the associated status comparator A10U502 and drives the output low The low signal indicates an active status which is sent to the secondary microprocessor A10U506 via Programmed GAL 100505 see schematic Sheet 1 The front panel CV annunciator lights when the CV mode is active CV is low and the CC annunciator lights when the CC mode is active CC is low If neither Is active the UNREGULATED Unr annunciator comes on A3 FET Board Troubleshooting Because test points on the FET board are not accessible when the board is installed troubleshooting must be performed with the board removed from the power supply Both static power removed and dynamic power applied troubleshooting procedures are provided The location of different test points are shown by encircled numbers on the A3 FET Board schematic and component location diagrams see Chapter 6 There are two isolated FET bridge assemblies see schematic in Fig 6 10 sheets 1 and 2 Test each FET bridge individually Note If any power FET Q201 204 Q301 304 Q211 Q311 Q222 Q322 Q233 Q333 Q244 Q344 is defective you must repla
165. used and the environmental conditions Tables 2 7 through 2 11 are dedicated to specific models Each sheet lists the acceptable test ranges for the model and provides a place to record the results of the test Note It is recommended that before you perform the tests in either Table 2 4 or Table 2 5 that you first locate the appropriate Performance Test Record sheet from Tables 2 7 through Table 2 11 for your specific model Make a copy of this sheet and record the actual observed values in it while performing the tests Use the sheets in Tables 2 7 through Table 2 11 as master reference sheets to run copies at any time Verification 13 Operation Verification Tests Table 2 3 lists the requirements for operation verification which is a subset of the performance tests Table 2 3 Operation Verification Tests Refer To Turn On Checkout Power Supply Operating Manual Voltage Programming and Readback Accuracy Table 2 4 Current Programming and Readback Accuracy Table 2 5 Note Record the results of Tests 2 and 3 in the appropriate Performance Test Record sheets Performance Tests Performance tests check all the specifications of the power supply The tests are grouped into constant voltage mode tests Table 2 4 and constant current mode tests Table 2 5 Constant Voltage CV Tests Test Setup Connect your dc voltmeter leads to only S and S see Figure 2 1 because the power supply regulates the voltage between these points
166. voltage level is reached within oscilloscope on both the negative and positive slopes of the transient 900us Record the voltage level obtained at the 900 us interval UNLOADING TRANSIENT NOMINAL VOLTAGE LOADING TRANSIENT Figure 2 2 Transient Response Waveform 18 Verification Constant Current CC Tests Test Setup Connect the appropriate current monitoring resistor see Table 2 1 as shown in Fig 2 3 The accuracy of the resistor must be as specified in the table Test Procedures The test procedures are given in Table 2 5 The tests are independent and may be performed in any order The CC tests are Current Programming and Readback Accuracy CC Load Effect CC Source Effect CC Noise PARD Table 2 5 Constant Current CC Tests Current Programming and Readback Accuracy This test verifies that the current programming and readback are within specification 1 Turn off the power supply and connect the current monitoring resistor as shown in Fig 2 3 Connect a DVM across the resistor 2 Turn on the power supply and program the output for 5 volts and 0 amperes 3 Short the load 4 Observe the DVM voltage reading Divide this by the resistance of the Value within specified Low Current current monitor resistor Record the result as the Low Current value limits 5 Record the front panel display readback Value within specified readback limits 6 Program output current to full scale see Table 2 2 7
167. y by qualified electronics personnel Programming Parameters Table 2 2 lists the programming voltage and current values for each model You can enter these values either from the front panel or from a controller over the GPIB Table 2 2 Programming Voltage and Current Values Agilent Model Full Scale Max Prog Full Scale Max Prog Max Prog Voltage Voltage Current Current Overvoltage Agilent 6680A 5V 5 125V 875A 895A 6 25V Agilent 6681A 8V 8 190V 580A 592A 10 0V Agilent 6682A 21V 21 50V 240A 246A 26 3V Agilent 6683A 32V 32 80V 160A 164A 40 0V Agilent 6684A 40V 41 00V 128A 131A 50 0V General Measurement Techniques Figure 2 1 shows the setup for the Constant Voltage tests Measure the dc output voltage directly at the sense S and S terminals Connect these terminals for remote sensing to the S and S terminals Connect these terminals for local sensing Be certain to use load leads of sufficient wire gauge to carry the output current see Chapter 4 of the Power Supply Operating Manual To avoid noise pickup use coaxial cable or shielded pairs for the test leads If you use more than one meter or a meter and an oscilloscope connect separate leads for each instrument to avoid mutual coupling effects Performance Test Record Sheets When performing the tests in this chapter refer to the Performance Test Record sheets supplied at the end of this chapter Table 2 6 is for recording common information such as the test equipment

668x SERVICE MANUAL

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