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657xA, 667xA Service Manual

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1. l 2514 6ZTY SH SITTA og IN Twas g k 8219 3 J 9018 LETI a zi Sota Orta TOE an w STE 70 z T m 3 3 J h tv x A3 Coop sasan pa 8213 Sty TITA 5 2 o O x 2 D rere Yoox c Y Tota N TL 8 E 2019 x 5 2519 e n gt gt m o m 80 o 2
2. D902 TO HEATSINK TO E900 550 amp 60U MODELS ONLY so NOTE THIS PART IS USED ON THE 120U UNIT ONLY 19 iQ 0 6 C911 C913 SNUBBER BD W900 W901 1 4 1 4W 250u 5905 mike C907 5 022 1000PF 1 49 ga 1 M1 HH 25086 022 250V FH NOT 77 LOADED L901 3 7UH L902 3 7UH e a OUT BUSBAR 1 W918 W920 gt 0 54 FET BD L C905 TB201 lt C901 R909 LR917 2400 0 1 Bi 2 PINS 1 4 2000 C903 3K 3K 200 75V 2000 5 5 E900 Ed OUTPUT STUDS TO L903 ind eH H 4 1000 5 4 fedi S98NH Bs Cod H W921 PINS 5 8 N C N C anc 529 910 14 rene gt O S YE NAA 9 OUT BUSBAR L900 mm Ruin Roues DPS 7900 gcaTeD Soot ON OUTPUT eiaa R904 lt R903 R906 co14 R908 _ SUB CHASSIS T 33 M i uh sZ TT000PF S L 3J900 12 007 i 4917 a 1 44 2500 1744 e concra 0 DEGREES
3. C906 C gt R915 9 TN 9 GJ O 0169 6064 0 e R903 E R904 006M TO6M O Figure 6 13 A6 Output Filter amp A7 Snubber Boards Assembly Diagrams 65 6671A 72A TO FET BD TB201 SNUBBER BD 1 A ie PINS 1 4 TO FET BD TB201 PINS 5 8 7900 1900 SUB CHASSIS LOCATED ON OUTPUT NOTE 1 2 amp SHIELDS ARE NOT USED ON 8U UNITS T SNUBBER BD 2 0911 FROM HEATSINK CRECTIFIER CATHODE 24 C913 C907 W901 4900 es 250VAC 1000PF 250VAC e gt OUT BUSBAR 1 410905 09013 C902 0903 904 909 LR910 C906 51 51 1901 7122000 1902 ELS 2000 T22000 722000 2 2000 5 5x 16V T22000 16U 16 16V 16V 24 24 2 5UH 2 5UH 16V L903 1904 NOT NOT USED USED e e OUT BUSBAR DPS R906 2 5x C908 1 44 Jo00 12 0UT 1000PF 2500 900 11 OUT TP6 DPS CATS 022 ISEN 900 4 ISEN 2500 Eu ISEN 3J900 5 ISEN 77 14 2U 4900 6 F901 F902 10A 10A gt 1900 2
4. SS 21 CV load effect testing x ign PO USER QURE a ated ee Ee tercer dtes 21 Index 155 noise PARD defined 24 naieimecaLSNaiS ec naut Iu nene 21 CV norse PARD 21 CV source effect defined a aasan sie enne pH Den re PURI DER PR RUFI REIR 21 CV SOURCE etfecttestInp s EE EEEE E ponia ie eec pies eere ie e aite d 20 CV transient response waveform Lee eterne tbe Nere eri enero stas rente etre recien the 22 CV transient recovery time defined n a m enne enne nene 22 CV transient recovery time ccrte 22 CV voltage programming and readback accuracy testing sese eene ener nee 20 D Diagram Cabling eerte e e tee ete e tc e eee tee e te e ete nte eere 131 DIG CNTI port En ERR soe E 61 disassembly procedures er UT UR e HERR Ret Eee iu 73 downprogrammer FETS location of 2 reiten 75 E electronic load EGG ov eae 16 23 error CHECKSUM o d e e m bea m mthi t 35 error code pM EE 35 SES 35 ED D De 35 lp
5. iS CC ANNUNCIATOR ON TURN OFF SUPPLY REMOVE SHUNT FROM OUTPUT TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO FULL SCALE PROGRAM OV TO 1 2 FS VOLTAGE CHECK THAT SUPPLY GOES INTO AN OV CONDITION PROT ANNUNCIATOR AND OUTPUT 0 LOW LEVEL AT 2 CHECK A5U502 R502 NO CHECK A5U630 GO WILL NOT FIRE TROUBLESHOOTING FIG 3 3 CONDITION OCCURRED Figure 3 1 Overall Troubleshooting Sheet 2 of 4 34 Troubleshooting FROM SHEET 2 PROGRAM OV TO MAXIMUM AND PRESS PROT 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 SLOW DOWN PROGRAMMING TROUBLESHOOTING GEE FIG 3 12 TURN OFF SUPPLY AND CONNECT A GPIB CONTROLLER TO THE SUPPLY CHECK IF THE SUPPLY ACCEPTS GPIB COMMANDS ACCEPTS COMMANDS CHECK GPIB CABLE 2015 017 1120 1914 YES ANALOG PROGRAMMABLE SUPPLIES SYSTEM SUPPLIES CHECK OPERATION OF THE DIGITAL CONTROL PORT SERIAL LINK AND THE FRONT PANEL V I ROTARY CONTROLS DIGITAL CONTROL PORT OK CHECK 2113 0 18 0114 USE PRIMARY SA TABLE 3 5 TO CHECK A2UfI4 48 CHECK A22U109 1 14 USE PRIMARY SA TABLE 3 5 TO CHECK A2U108 CHECK FRONT PANEL VOLTAGE CURRENT ROTARY CONTROLS
6. 0805 04 02 915802 9 5 Figure 6 18 A2 Isolator Board Assembly and Schematic Diagram for 654xA amp 655xA Models Only 50 50 R802 4 64K in 4 64K 5U TO FRONT PANEL J802 1 J802 2 REFERENCED TO SUPPLY COMMON J802 z 600V ISOLATION J802 4 REFERENCED TO 2 EARTH GROUND gt J802 6 4802 I 511 50 50 A m CR802 C804 J803 2 BIAS 5200 25 J803 1 CR803 PHONE CONNECTOR PIN DESIGNATIONS 5 3 1 4 4 6 4 2 Figure 6 19 A2 Isolator Board Assembly and Schematic Diagram 667xA only Backdating Manual backdating describes changes that must be made to this manual for power supplies whose serial numbers 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
7. 35 D es 35 BS gas E AA E Re NUES 35 BA ise eri de ERR ORE ches 35 AR Di aene di tau be ipea estin UE 35 A 35 BT 3s ut ES tbe one aes eee e a OE 35 Dp eR OR DE 35 EO 35 error code OV Els GPIB miu must RERUM LA A e 34 error code selftest 2 oa eta a awa nat 35 error message CAT DENIED cC 67 DACS As Sage eed MAA dame us aaa shu 35 EE CHKSM Retin tie Remb 35 35 RAM DC 35 FP ROM Z 35 eue Ree 35 GPIB M 35 67 PRI TRAM 253 eed oC dete cao e BADER AN RI ER 35 5 Pe eR Ee A EIS 35 PREXRAM Dpto en 35 SB UEFULL sunsu de EEEE EAE O rr EEE 35 SBUF OVERRUN 2243664000229000 eet io dS 35 heh eda eee ae S 35 SECONDARY DNWN
8. mapasa yau OR P ction FREUEN HER FEE REESE ERR 15 Test S etUp oi oec pnt atitem i iet ee buie tun SN 15 Test M E 15 Constant Current CC Tests eL RR deste d edt A A c ipee ee ae 19 19 E TE 19 Averaging the CC Measurements seuen eN dos Ee e a e a E 22 Troubleshooting 29 rr 29 Localizing the Problem t betes ie diem 29 Chapter Organization eS Ret el ete iti 29 Test Equipment REPRE deese 30 Troubleshooting Procedures 5 tr ete th eee etg T P ee i teo 30 Power E 30 proni 30 Disabling The Power On 30 Using the TST Query GPIB Systems Supplies Only nn 30 Tro bl shootmg Charts eei Rp et d nt RU DE L EUR RI UU pe IU e Ode Ene 32 Troubleshooting Test Points oce iere de tobi be 32 Bias and Reference Supplies e epe eee beati eerte ette te ete tie 32 Status Annunciators Troubleshooting sees nre enne 53 5 Control Board Troubleshooting Setup esee drier trennen trennen reete ennt
9. VIL 5 L L Le C893 11013 L lt 10 T 80U 15 F a CU ERROR UCU R715 AMP 5550 4 09K 111 500 212 R785 HL VJ c 15V 182k LOAD LOAD R771 C721 0288 UF_SEN r 0 1 EL 500 500 068355 95K 1x 17104 lt OUT 0695 P jr 1 100V 691 R740 R730 NO SOLDER DO NOT 10K j MASK RELIEF NZD676 2 2 LOAD 509 R232 s 100V w 1 11 15100 R791 c717 40K C852 p854 T w 1000PF 250UAC V 61 9K 8 U618 4 LF412 ZND665 15V Figure 6 12 A5 Board CV CC Control Circuits Schematic sheet 2 RAMP GENERATOR C624 60 amp DEADTIME LATCH 100 6800PF 500 0 1 50V 15U 988 RE34 LATCH P O OUTPUT BD d S RE any CONNECTOR D gt SU 1 40UT CJ 5ss10 12 C600 5 C60 CJ 9510 11 I it PWM IC T AEN ste 350 URG ISEN C 294510 5 n 18 0753 UC 150 s tinnu 14 rye ai 1000 FAST SENSE ANS SIL R601 ilr 16 2K A GE 60 3 01K E m aq 11 60 DIF AMP bois INV1 oc r r 42 2K 0 1 1510 20 T All 9621 8 221K SUMMING J N C610 L R624 1 gt FDBK Bee 3 C631
10. 35V C805 0160 5422 Capacitor 0 047uF 20 C806 0160 5422 Capacitor 0 047uF 20 CR800 1901 0731 Diode power rectifier CR801 1901 0731 Diode power rectifier CR802 1901 0731 Diode power rectifier CR803 1901 0731 Diode power rectifier F800 2110 0951 Fuse subminature 5 AT J800 801 1251 8184 Receptacle modular phone J802 1251 4926 Connector test point header J803 1251 4245 Connector 2 pin male R800 0757 0401 Resistor 100 Q 1 0 125W R801 0698 3155 Resistor 4 64K 1 R802 0698 3155 Resistor 4 64K 1 R803 0698 0082 Resistor 464 Q 1 0 125W R804 0698 0082 Resistor 464 1 0 125W R805 0698 3155 Resistor 4 64K 1 R806 0698 3155 Resistor 4 64K 1 R807 0698 3155 Resistor 4 64K 1 U800 1990 0543 IC Opto isolator 0801 1990 0444 IC Opto isolator 0802 1990 0444 IC Opto isolator 0803 1820 1201 SN74LS08N 0804 1820 1438 IC SN74LS257N 0805 1826 0122 IC UA7805UC 5060 2948 Heat sink assembly TO 220 U805 1205 0282 Heat sink Replaceable Parts 93 Table 5 6 A2 GPIB Board Replaceable Parts see Note Ref Desig Agilent Part No Description 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 1251 7330 Connector Receptacle J108 1251 7330 Connector Rec
11. FRONT PANEL CONTROLS OK CHECK VOLTAGE 410 AND OR CURRENT 162 CONTROLS AND CABLE CONNECTIONS NO PROBLEMS FOUND PERFORM VERIFICATIONS TESTS IN CHAPTER 2 TO DETERMINE IF A PROBLEM EXISTS Figure 3 1 Overall Troubleshooting Sheet 3 of 4 Troubleshooting 35 FROM SHEET 1 PROT ANNUNCIATOR ON NO YES PRESS PROTECT KEY or YES DISPLAYED NO YES DISPLAYED oc YES DISPLAYED RI REMOTE INHIBIT DISPLAYED CHECK FOR SHORT BETWEEN A2TB101 3 AND GROUND 667xA ONLY 36 Troubleshooting FROM SHEET 2 OUTPUR VOLTAGE NEAR ov AGE RIGHT BUT OUTSIDE SPEC Y NO GO TO OUTPUT HELD LOW Es TROUBLESHOOTING FIG 3 6 CHECK CURRENT AMP CIRCUITS A5U612 0617 YES GO TO OUTPUT HELD HIGH TROUBLESHOOTING FIG 3 6 CHECK A4RT300 R530 U513 GO TO AT TURN ON TROUBLESHOOTING FIG 3 4 CHECK IF OCP 15 ENABLED AT TURN ON AND CURRENT 15 PROGRAMMED TO ZERO OR OUTPUT SHORTED 3 10 Figure 3 1 Overall Troubleshooting Sheet 4 of 4 START DISPLAY WARNING THS CONFIGURATION IS FOR THE TEST ONLY 00 NOT FLOAT THE OUTPUT OR ATTEMPT TO OPERATE THE SUPPLY TURN OFF SUPPLY AND REMOVE TOP COVER AND AR SHIELD UNPLUG CABLE W5 FROM J108 A2 GPIB BOARD AND UNPLUG CABLE W4 FROM J502 ON 5 CONTROL BOARD PLUG CABLE WS INTO J502 CONTROL BOARD THIS REMOVES THE GPIB BOARD FROM
12. acd gt 3 E T 4 Gg lH 5 TETS a lo x 0 hie lt l x o a 9 roto aa 52 PED gt zotan 9219 celo o 0 ren 0719 6019 ai 1219 62T9 s 3 S219 ci Pi PITA Q u N 10 A 2 2 5 n zi cota POTA gt 9019 0112 2519 RS N peta gt 5 0274 WITI m N 2 a e T c E 5 s 5 a 5 5 lt gt L a a Figure 6 5 2 GPIB Board Assembly Diagram 667xA only P101 2 P101 715 0121 LM309K UCC D108 5 0101 SEND y I SEN2 D110 REM MC3423 R104 GND 4 64K D107 J114 TELE JACK IN J115 TELE JACK OUT rs 4101 16 J101 15 4101 14 4101 12 4101 4 4101 3 4101 2 J101 1 1101 18 4 J101 1901 9 4101 20 3101 215 POW S U1 O C124 UC 98102 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 Po 20 UCC U122 DC TE REN REN IFC IFC NRFD NRFD NDRC NDAC DAU DAV EOI EOI ATN ATN SRQ SRQ 75161B GND 10 V 22 44 200 34 s
13. intet e e etc PE Pre canes HEUS REO DER RETE RED DER E REO HE OBERE 35 SEC sock seeds eie optet ote in tete CRDI T Rd 35 156 Index SERIALE DOWN neci A Bee a evene 35 SERIAL TIMODUT tne DURER DURER GER 35 TEMP a H 35 UART OVERRUN 3p to e RUE Riis aioe e ed e pe e pe PE eus 35 VART PARITY I n amete 35 error message eU RAO EP SA Etre Ht etre ee eects eset 35 errors ETE 36 tear E terere ip rp l e mite Ales 36 ESD 1 2 3 1 F factory calibration constants deeper RR ER Ere 67 ALMA WATE TEVISIONS eerte beue eMe 12 firmware TeVIsIoDs oai eo Te eee iere perd i E 60 Form performance u ee perire h te 27 front panel EEPROM factory cal loCatiofr i ore c e tee e e i o P sages i e d erc e b p ved terrd 68 EE 68 transferring constants to eee eee sS 68 front panel operation rtr DE PERF 11 front panel testing 34 G GPIB MN 25 UR pi deinen RU ER 67 GPIB interface testing oie necp ente uaa Pe edem evs
14. SS 1853 0655 u gt e 1853 0655 a 259 3 NR 7466 6690 88 AFER e UFER 9 228 T e 8 525 35 3 2212 0116 8 2212 0116 Sb HNOZ SU HNOZ WW ne ev 1066 6690 6021 KA Hz V IRGP20B60PD IRGP20B60PD 1854 1784 1854 1784 oszu CI AML NAL L lt L S 0 390022 SL 9005 390022 BS 9 WN 8 it EET ozzy 120 Rt si vee 7120 8 L12266 EG Ces 8 9 0620 0866 6690 1966 6690 V ALZ V NAA 9220 0112 7 z 9220 0112 2668 8 8063 9 voca Be 2 55 Emo d 9 m 58 9220 0112 2 M 2 9220 0112 1023 Hi 9 2023 F B ET 9089 0910 9827 6690 9827 6690 a X 8 Wd Aooy 06 OSE ML H Sexes HO 0 S 1862 6690 J 2 6966 6690 VVV V AVIS V 3606 vrzo 812 612 Da AA e 9089 0910 lt 82 6690 982 6690 s lt 8 0968 sed Wd 056 OSE 9 58 01 10 1 1 298 L AN 58 poe 1946 690 Gv 668 8 AM xg 002 d 229 55789 51980 gcbRE N lt Neo 40 29 E sr 0866 6690 WN 156 0910 Bu Pu meu a NAL AML 9 02 390022 S 02 390022 8 0910 e AAA 1 e V 4401 y 8220 0120 9124 1729 e Seco 862 0910 7841 7981 7841 7981 Sg ean 2212 0116 0980299 1 2212 0116 85 3 4 fo HNOZ s be HNO gor8 T
15. gt TO TP1 fz 680 FET BD 587 TB201 lt R995 LR993 LR991 T uc lt 18A ta 0901 18A PINS 5 8 23 17 gt TO TP29 29 z lt 92915 CHOKE LUG 1 4 Es E HEATSINK 2u 2200 PF 2700 GROUND T900 LOCATED REOR 1KU amp ON OUTPUT D90 0 MOUNTED ON H S 2 1 1900 508 CHASSIS 0901 8992 EL SHIELDS R998 680 zu R999 SNUBBER BD M 18A 18A E6 18A D901 C XFMR LUG Figure 6 16 Output Filter amp A7 Snubber Boards Schematic Diagrams 65 6673A 75A lt gt 933 4915 0 ED GURS01 41 901 0901 O 0909 O Q OO QOQ 902 490 Figure 6 17 A6 Output Filter amp A7 Snubber Boards Assembly Diagrams 65 6675A BIAS 50 R802 4 64K 5U 50 R806 4 64K TO FRONT PANEL J803 2 J802 1 J802 2 J802 3 J802 4 J802 5 J803 1 Goal IHS11 50 CR802 C803 C804 jy 3 CR803 e e M3 PL M3 PL J802 6 J802 7 U804 0803
16. I 6 5 E FEM C855 COMPARA OR LM311 4 7 C553 LF412 4 C751 16 enue 15U R831 2 2PF R666 L 0935 L 1000 SS 1 82K 16 2K PWM 15 R608 FILTER 0 1 R652 phe 3 01K R609 50 1510 19 J503 1 R871 UFSC C700 221K taj lt 7 Hx Ser Bn 1150 21 5 TioooPr C601 1000 R653 nek R604 ae EE Z ND613 lt 30 1K 6 TLS98 FET BD 5 22PF 0 1 RT 15U 150 1007 50 21 5 TRANSFORMER V R621 C736 4 jl ouT2 J503 2 dj 15V 7 C602 GND PGND 200 6904 14K ET UFSC 2 2 T330PF R840 V IE 3 01K 100U 1000 IMON C gt UFSC Z 5829 PWM PWM 1 21M MID BAND 14 3U B rd aln af ZND611 570612 GAIN BOOS 1510 13 OY COMPARATOR R694 D680 ZND689 570610 11 6U DOWN PROGRAMMER CONTROL CIRCUIT L UFSC UFSC 14 30 R695 Q602 TO GATE R678 usss J510 z OUCMP SON 42 2K EL a 1 R680 0 1 R688 _ 311 U609 4 99 240 14 30 500 L MY 6 UDP I 1 7 R679 655 Re82 li V UDP 4 64K 470 3 6K bores R689 R690 R682 in EUR 14 3 42 2K R834 R684 J509 7 1K 4 99 V DP SHUNT 550978 UDP 0PS L m J510 1 14 30 510 2 Figure 6 12 5 Board Switch Downprog amp OV Monitor Schematic sheet 3 o rO rO POU R991 R995 R993 R994 R992 R990 E10 E20 30 dod 1663 O O O 09 C ol O O O
17. 2240 Ps error Error handling subroutine 2250 OUTPUT Ps SYST ERR Check for errors 2260 ENTER Ps Err 2270 RETURN 2280 2290 END Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 6 of 6 Disassembly Procedures Shock Hazard To avoid the possibility of personal injury remove the 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 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 Most of the attaching hardware is metric Use of other types of fasteners will damage threaded inserts CAUTION Older power supplies use TORX screws for securing the carrying straps When removing or installing these screws use TORX screwdriver size T 15 unless T 10 is specified Top Cover 1 Remove the four screws that secure both the carrying straps and the cover to the chassis 2 Spread the bottom rear of the cover and then pull back to disengage it from the front panel 3 Remove the cover by sliding it back towards the rear of the power supply Shock Hazard Hazardous voltage can remain inside the power supply even after it has been turned off Check the INPUT RAIL LED A4CR402 under the RFI shi
18. Note After completing this test you can exit the SA mode only by performing a power on reset 62 Troubleshooting 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 5 Control Board CV CC DACs operational amplifiers CV CC control circuit amplifiers readback DAC operational amplifier readback comparators 1 Front Panel Assy A 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 correct password as described in Appendix A of the Operating Manual As shipped from the factory the supply s model number e g 6671 is the password If you use an inc
19. 2 Disconnect LCD display ribbon cable W2 from J2 on the Al 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 Use a small Allen wrench 0 050 to loosen the set screws that are inset in the knobs These are and AlG2 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 front panel board and slide left to release board from the Al Front Panel Assembly and remove board A1DSP1 LCD Display 1 Remove the A1 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 The display connector is fragile When removing the cable from the LCD display carefully rock the CAUTION p cable connector back and forth while gently pulling it back A1G1 and A1G2 Rotary Controls 1 Remove the Front Panel Board as described in that procedure 2 Remove the and AIG2 cables from
20. 667xA Only Remove the two hex standoffs and washers securing the GPIB connector to the rear panel 667xA Only Release GPIB board from holding bracket and remove board from the chassis Men b Output Subchassis The Output Subchassis houses the A5 Control Board A6 Output Board A7 Snubber Board power output transformer choke and output heatsink assembly The output power rectifier D900 and the downprogrammer FETS 60901 902 are mounted on the output heatsink assembly To remove the Output Subchassis proceed as follows Remove Top Cover and RFI Shield as described under their respective procedures Remove the Rear Panel and A2 Board as described in the combined procedure Disconnect the two transformer T900 primary leads from the TB201 terminals fuse clip type on the A3 FET Board Disconnect cables from the following connectors on the A5 Control Board a Phone cable W4 from A5J502 b Ribbon cable W3 from A5J509 c 2 wire cable W7 from A5J503 position the cable away from and clear of output heatsink assembly Remove screw securing output heatsink bracket to the fan assembly Remove the screw located between T900 and L200 securing the bottom of the Output Subchassis to the main chassis Remove three screws securing the side of the Output Subchassis to the side of the main chassis Slide Output Subchassis to rear lift it up and remove it from the main chassis 5 e A5 Control Board Note The A5 Control B
21. F308 2110 0202 Fuse 0 5AT 250V F400 2110 0849 Fuse 25AM 250V F401 2110 0098 Fuse 20AM 250V FL1 see Table 5 3 1301 302 40 1252 0055 Connector POST TP HDR 1500 1251 8837 Connector POST TP HDR K400 401 0490 1746 Relay IC 30A 30Vdc 15Vdc coil L402 06012 80095 Inductor output choke R315 0698 8672 Resistor 243 4 1 R316 0698 0085 Resistor 2 61K 1 R317 8159 0005 Resistor 0 R326 0698 8672 Resistor 243 4 Q 0 1 R327 0757 0281 Resistor 2 74K 1 R328 0757 0281 Resistor 2 74K 1 R329 0698 8672 Resistor 243 4 0 1 R330 331 8159 0005 Resistor 0 Q R332 0764 0041 Resistor 30 Q 5 2W R333 8159 0005 Resistor 0 Q R339 0698 3155 Resistor 4 64K 1 R350 0757 0434 Resistor 3 65K 1 96 Replaceable Parts Table 5 8 A4 AC Input Board Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS continued R351 0698 3155 Resistor 4 64K 1 R352 0757 0280 Resistor 1K 1 0 125W R361 0698 5090 Resistor 43K 1 0 125W R362 0698 3201 Resistor 80K 1 0 125W R363 0698 5090 Resistor 43K 1 0 125W R364 0764 0015 Resistor 560 Q 5 2W R367 0757 0401 Resistor 100 Q 1 0 125W R368 0757 0444 Resistor 12 1K 1 R369 370 0698 8812 Resistor 1 1 0 25W F R371 372 0757 0465 Resistor 100K 1 R373 0757 0401 Resistor 100 Q 1 0 125W R374 0698 3155 Resistor 4 64K 1 R375 376 0757 0346 Resistor 10 Q 1 0 125W R377 0698 3642 Resistor 3K 5 2W R378 0683 6845 Resistor 68
22. J201 268 DRIVE_A DRIVE_B 8 8 Y HS Hy Sa 5 AAA lt Bras 0268 LOZYHA oa hose Bale gt 1166 6690 9 5 8 6125 6690 Y M 582 6690 ose 6968 5158 2 G nt 5581 1061 1927 0910 028 8 100 206 teza 2 2 0266 6690 lt 8 d Ew v X0 Sl 35 2 VVA 2 S S 976882585 van gszu 25 28 5 g 8 V Q Noy L S 1001 1910 1 8 39 ASZ 2 Dv e 2669 g 5 EE 2 Bx X o os 28 Ble 9 55 Om 8 8 i229 Sog a e e 9722 0910 WX 8 7160 1910 H 9 8120 0 PO 0682 6690 e 88 006 1220 8278 91 1061 NS AMA LJ 00590 lt 8 192 0910 ceed 90 8 100 28 02 e 5 98 9288 0910 gezo S gt g 16 6690 IN A000 0220 og lt a V 918 G 44001 N lt 9 Jos 1941 0910 ANN 5 los 52 88 2 98 8 100 f Bore ES 8 8275 oeza 8272 S lt 2820 lt 8 Jeg 8 2 8 e 5 1906 0291 5 2 700 9020 5278 8 2 88 NS 9 NA a B L lt lt 2 8 8 4 e 6 2 S 5 age 5 v 5 v amp V gal MJD45H11 eal MJD45H11 a 18 st
23. b red and black rail cable W9 leads from E411 and E412 on the AC Input Board c 2 wire cable W7 from A3J200 on the FET Board Remove screw securing the FET heatsink to the fan assembly Remove screw securing the FET heatsink to the bottom of the main chassis Slide the FET Board Heatsink Assembly forward and lift it out of chassis Pry up the plastic tabs securing the FET Board and the Heatsink Assembly to the metal bracket and separate the heatsink from the bracket To further separate the A3 FET Board from the Heatsink Assembly proceed as follows Troubleshooting 73 CAUTION Observe standard antistatic practices against ESD when working with the MOSFETs Refer to Chapter 1 for more information on antistatic procedures Remove four screws securing the FET Board to the Heat Sink Assembly Remove the two screws securing each of the eight MOSFET s to the Heatsink Assembly and the sockets on the FET Board Use a size T 10 TORX screwdriver to remove these screws 3 Unplug each MOSFET from the socket on the FET Board and separate the board from the Heat Sink Assembly N Note When you replace these MOSFETs Q201 204 211 222 233 244 be sure to install the appropriate mica insulator see Replaceable Parts between each MOSFET and the heat sink A4 AC Input Board 1 Remove the A3 FET Board and Heatsink Subassembly as described in the combined procedure 2 Disconnect the cable from A4J302 3 Remove the 13 scre
24. 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A W916 917 Model specific 6571 A 6574A 6671A 6674A 6575A 6675A W918 W921 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A Agilent Part No ELECTRICAL PARTS Not used 5080 2177 Not used 5080 2177 Not used 5080 2177 Not used 5080 2177 Not used 5080 2177 MECHANICAL PARTS 1251 4211 Connector Q901 1340 1507 0515 1253 Insulator Q901 902 and 903 Screw cap M 8X1 25 shunt to A6 bd Replaceable Parts 115 Table 5 11 A7 Snubber Board Replaceable Parts Ref Desig C901 Model specific 6571A 6574A 6671A 6674A 6575A 6675A C990 991 Model specific 6571A 6671A 0160 5927 6572A 6672A 0160 6896 6573A 6673A 0160 6030 6574 6575A 6674A 0160 6838 6675A R990 991 Model specific 6571A 6671A 0698 3601 572A 6672A 6572A 6672A 0698 3614 6573A 6673A 6574 6575A 0764 0013 6674A 6675A R992 R995 Model specific 6571A 6671A 6572A 6672A 0698 3614 6573A 6673A 6574 6575A 0764 0013 6674A 6675A R996 R999 Model specific 6571A 6574A 6671A 6674A 6575A 6675A 0698 3635 116 Replaceable Parts Agilent Part No Description ELECTRICAL PARTS Not used 0764 0013 Capacitor 2200pF 1KV Capacitor 0 022uF 400V Capacitor 0 015uF 400V Capacitor 0 01 400V Capacitor 2200pF 1KV Resistor 10 Q 5 2W
25. ARE VOLTAGES OK TURN OFF THE SUPPLY AND PERFORM AS CONTROL BOARD TROUBLE SHOOTING SETUP TABLE 3 3 SHORT ASU504 1 SA MODE TO A5U504 20 SEE AG 3 15 TURN ON SUPPLY AND WAIT 2 SECONDS THEN REMOVE SHORT WAIT FOR TO COMPLETE USE A SCOPE TO CHECK THE CV DAC A5U508 8 CC DAC ASUSI0 6 READBACK DAC 51 512 6 OUTPUTS COMPARE THE WAVEFORMS TAKEN AT THESE POINTS WITH THE WAVEFORMS GIVEN IN FIG 3 8 YES DAC OUTPUT MISSING NO ARE ALL YES DACS MISSING STEPS is OR CC DAC DEFECTIVE YES CHECK REF VOLTAGE FOR READBACK DAC AT ASU517 7 38 WITH RESPECT TO 36 CHECK ASU517 x THE SUPPLY FAILS SELF TEST TURN OFF THE SUPPLY DEPRESS THE 7 KEY AND THEN TURN IT ON WHILE HOLDING THE KEY DOWN 50 AS TO SKIP SELF TEST TROUBLESHOOT THE OEFECTIVE CIRCUIT DAC 15 DEFECTIVE CV 45US07 CC ASUSOS OR READBACK 450510 CHECK ASUSO4 SEE TABLE 3 7 CHECK REF VOLTAGE FOR CV CC DACS AT ASUS05 6 WITH RESPECT YES DOES A5U505 8 10V CHECK ASUSH 0512 CHECK 50505 Figure 3 7 DAC Circuits Troubleshooting 44 Troubleshooting PERFORM DAC AMPUFIER TROUBLESHOOTING SEE FIG 3 9 a j A End MES REESE RT A 0 2 mS DIV A CV DAC U508 6 AND CC DAC U510 6 OUTPUTS pv 5V 0 2 mS DIV B
26. C722 Model specific 6571A 6671A 6672A 6573A 6673A 6674A 6575A 6675A C723 C724 C731 C732 C733 C734 735 C736 C737 C738 C739 C740 C741 Agilent Part No ELECTRICAL PARTS 0160 4808 Capacitor 470pF 5 0160 4821 Capacitor 1200pF 5 0160 4808 Capacitor 470pF 5 0160 4821 Capacitor 1200pF 5 0160 4795 Capacitor 4 7pF 0160 4835 Capacitor 0 1uF 10 50V 0160 4808 Capacitor 470pF 5 0160 4813 Capacitor 180pF 5 0160 4808 Capacitor 470pF 5 0160 4812 Capacitor 220pF 5 0160 4805 Capacitor 47pF 5 100V 0160 5098 Capacitor 0 22 10 0160 4835 Capacitor 0 1 10 50V 0160 4834 Capacitor 0 47uF 10 0160 4808 Capacitor 470pF 5 0160 4812 Capacitor 220pF 5 0160 4835 Capacitor 0 1 10 50V 0160 5469 Capacitor 1uF 10 50V 0160 5892 Capacitor 0 22 10 0160 5468 Capacitor 0 47 50V 0160 7277 Capacitor 2 24F 50V 0160 4835 Capacitor 0 1 10 50V 0160 4832 Capacitor 0 01uF 10 0160 4791 Capacitor 10 5 100V 0160 4787 Capacitor 22pF 5 100V 0160 4797 Capacitor 3 3pF 0160 4835 Capacitor 0 1 10 50V 0160 4797 Capacitor 3 3pF 0160 5098 Capacitor 0 22 10 0160 4811 Capacitor 270pF 5 0160 4799 Capacitor 2 2pF 0160 4795 Capacitor 4 7pF 0160 4835 Capacitor 0 1 10 50V Replaceable Parts 101 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig C750 751 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C760 C851
27. C852 C855 C885 894 895 C892 893 C896 C899 D530 D605 610 613 615 D618 D620 621 626 627 630 631 641 D651 D660 661 D662 665 D666 668 D676 D678 D679 680 D685 D687 D688 689 D690 692 R504 Model specific 6571A 6671A 6572A 6574A 6672A 6674A 6575A 6675A 102 Replaceable Parts Agilent Part No Description ELECTRICAL PARTS Not used 0160 4829 Capacitor 680pF 10 0160 4822 Capacitor 1000pF 5 0160 0178 Capacitor 470pF 5 0160 4788 Capacitor 18pF 5 100V 0160 4835 Capacitor 0 1 10 50V 0160 4183 Capacitor 1000pF 20 0160 5098 Capacitor 0 22 10 0160 4835 Capacitor 0 1 10 50V 0180 4136 Capacitor 10 20V 0160 4183 Capacitor 1000pF 2096 0160 4835 Capacitor 0 1 10 50V 0160 4801 Capacitor 100pF 5 1901 1098 Diode 1N4150 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0731 Diode PWR RECT 1901 0880 Diode GEN PRP 1252 3693 Connector 1251 7330 Receptacle modular phone 1252 0055 Connector POST TP HDR 1252 1992 Connector POST TP HDR 1251 8666 Connector POST TP 9140 0158 Inductor luH 10 1853 0510 Transistor PNP 0698 3456 Resistor 287K 1 1810 0305 Resistor network
28. entente stern entente entente 17 P Performance test tecord form EUR URBES FUE 27 performance tests CC tereti Pet die erteilen etd erede 23 performance tests C V pei ere e eU castes OS pte ie RE apr 20 power FETS replacing et ERE TIRE e MR 121 122 power on selftest tee ep ch ERU RE CH c rir EE 34 power on selftest disabling Seed en UU ten Uri UIN RU RD E EN 34 protective eartb ground et tenen Fe ipt ar ei hd aqila qu 13 R tecord SR EE AGE AES RIEF 17 reference supply e cre ERU EO n DP e Ote RR Rp n Fr EE 37 regulation Voltage E E 18 removing AT Front Panel Assembly pO er E OU ER ee a 74 AT Front Panel eise eoe te D a rE Ee paR DINE EE RH DIRE ENTRO TREE 74 AZ GPIB IB Oat etaps eren ee ite iride rte edo dete pte dt deus ds 75 eU QUEUE trees 77 Input Board cic tian GR EIN ere 78 A5 Control Board et itte oet E qp re Hee DRE ee qhawas 76 AG output Filter Board otn ien oue iine iita 76 AT Sn bbet Bo td x siae en eme a Pete Ie lese Atha E h cote pecie Ie tss s 76 AC input filter s oen eade temen aeg eeiam aniio itte et bees 78 noie oem Date ep ea ROT Den GP hasa a ki 77 heatsmk asse
29. 0699 2246 L PARTS Resistor 1K 1 0 125W Resistor 1 82K 1 Resistor 4 99K 1 Resistor 10K 1 0 125W Resistor 16 2K 1 Resistor 40K 0 1 0 1W Resistor 21 5K 1 Resistor 21 5 1 Resistor 0 Resistor 40K 0 1 0 1W Resistor 5 657K 0 1 Resistor 4 53K 0 1 Resistor 5 657K 0 1 Resistor 301 Q 1 0 125W Resistor 681 Q 0 1 0 1W Resistor 859 Q 0 1 Resistor 2 0081K 0 1 Resistor 4 99K 1 Resistor 4 64K 1 Resistor 1 82K 1 Resistor 681 Q 0 1 0 125W Resistor 200K 1 Resistor 221K 1 Resistor 340K 1 Resistor 182K 1 Resistor 261K 1 Resistor 40K 0 1 0 1W Resistor 1K 0 1 0 1W F Resistor 100 Q 0 1 Resistor 16 2K 1 Resistor 130K 1 Resistor 75K 1 0 125W Resistor 130K 1 Resistor 19K 0 05 Resistor 25K 0 05 Replaceable Parts 107 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig R807 R808 R809 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R810 R820 821 R822 823 R824 825 R827 R862 R893 R894 895 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6575A 6674A 6675A R896 0502 0503 Agilent Part No Description ELECTRICAL PARTS 0698 8827 Resistor 1M 1 0 125W 0757 0407 Resistor 200 Q 1 0 125W 0699 0489 Resistor 16 15K 0 01 0699 3103 Resistor 19K 0 05 0699 0489 Resistor 16 15K 0 01 0699 1510 Resistor 22 2K 0 05 0698 8093 Resistor 40K 0 1 0 1W 0757 0460 Resistor 61 9K
30. 0915 GND D910 D911 J900 16 144150 144150 Tooopr LOADED 250VAC J900 17 120 0901 DPS 3900 1 ieee 1 DOWNPROGRAMMER SHUNT 169 Q910 464 IRFIP044 DPS 5900 2 C9507 A uro01 8915 0 1 12V 12U 3 01K 4900 3 DOWNPROGRAMMER CONTROL 560 4900 20 FAST SENSE 1900 19 14 2U 4 93J900 13 gt J900 14 C931 gt J900 15 42 7 Snubber Board ET nubber Boar t t gt 1900 8 R994 R990 R992 x1 5990 gt J900 9 10 10 10 lt 5 5x 5x 0 1 FROM gt 1900 10 lt RECTIFIER ANODE M2 La 2 FROM lt RECTIFIER ROOz R991 x2 ANODE 10 10 s C991 5 5 022 Figure 6 14 A6 Output Filter amp A7 Snubber Boards Schematic Diagrams 65 6671A 72A o 3 nga 9 0901 0801 18 6 0909 z 9 E10 E20 9 Qd R991 O O R995 is E Qd R993 o Qj R994 1 o E a CH R992 OF R990 Q o Y o naci Figure 6 15 A6 Output Filter amp 7 Snubber Boards Assembly Diagrams 65 6673A 74 TPS
31. 1 1 with RF tip RMS Voltmeter True RMS Bandwidth 20MHz Sensitivity 100 uV 1 Agilent 6050B mainframe with 3 Agilent 6040A modules 2 Agilent 6050B mainframe with 3 Agilent 60507B modules plus 1 Agilent 6051A mainframe with 1 60507B module Agilent 54504A Agilent 3400B Variable Voltage Transformer Power 4KVA minimum Range 13 to 6 of input GPIB Controller Full GPIB capabilities HP Series 300 or Vectra with and Required for Operation Verification Tests Required for remote testing of 667xA models GPIB card Electronic Load Many of the test procedures require the use of 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 for a GPIB controller for 667xA system supplies The procedures assume you know how to use the front panel
32. 1 8W Agilent P N 0757 0283 Qty 1 2 Resistor R862 3 01K 1 1 8W Agilent P N 0757 0273 Qty 1 3 Resistor R861 267 Ohm 1 1 8W Agilent P N 0698 4446 Qty 1 4 Resistor R713 1 Meg 1 1 8W Agilent P N 0698 8827 Qty 1 5 Capacitor C885 0 1uF 50V Agilent P N 0160 4835 Qty 1 6 Capacitor C760 18pF 100V Agilent P N 0160 4788 Qty 1 7 Capacitor C681 0 01uF 100V Agilent P N 01604832 Qty 1 8 Diode D618 Agilent P N 1901 0880 Qty 1 CHANGE 1 Resistor R893 from 10K 1 1 8 Agilent PN 0757 0442 to 7 5K 1 1 8w Agilent P N 0757 0440 Qty 1 2 Resistor R805 from 20K 0 1 1 8 Agilent PN 0699 0118 to 19K 0 05 1 8w Agilent P N 0699 3103 Qty 1 3 Resistor R809 from 16 15K 0 1 1 8w Agilent PN 0699 0489 to 19K 0 05 1 8w Agilent P N 0699 3133 Qty 1 CHANGE 5 In Table 5 9 CHANGE Capacitor C684 from 2 2 Agilent P N 0160 7277 to 3 3uF Agilent P N 0160 7308 Qty 1 DELETE IC Socket 40 Pin REF U504 Agilent P N 1200 0552 Qty 1 ADD 1 Resistor R885 2 0K 196 1 8W Agilent P N 0757 0283 Qty 1 2 Resistor R862 3 01K 1 1 8W Agilent P N 0757 0273 Qty 1 3 Resistor R861 257 Ohm 1 1 8W Agilent P N 0698 4446 Qty 1 4 Resistor R713 2 7 Meg 596 1 4W Agilent PN 0683 2755 5 Capacitor C885 0 1uF 50V Agilent P N 0160 4835 Qty 1 6 Capacitor C760 18pF 100V Agilent P N 0160 4788 Qty 1 7 Capacitor C681 4700pF 100V Agilent P N 0160 4831 Qty 1 8 Diode D618 Agilent P N 1901 0880 Qty 1 CHANG
33. 6673A 6574A 6674A 6575A 6675A 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A 7 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A Bl C416 419 D900 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A 5060 3400 06571 61001 06572 61001 06573 61001 06574 61001 06575 61001 5060 3398 5060 3592 5060 3338 5060 3341 06671 61020 06672 61020 06673 61020 06674 61020 06675 61020 06671 61024 06672 61024 06673 61024 06674 61024 06675 61024 06671 61021 06672 61021 06673 61021 06674 61021 06675 61021 5060 3436 0180 4369 1906 0396 1906 0397 1906 0398 1906 0398 1906 0404 Front Panel Board for all 667xA Models see Table 5 4 Front Panel Board Tested amp Initialized see Table 5 4 Isolator Board see Table 5 5 GPIB Board see Table 5 6 FET Board Heat Sink Assembly see Table 5 7 AC Input Board see Table 5 8 Control Board see Table 5 9 Output Filter Board see Table 5 10 Snubber Board see Table 5 11 Fan assembly Capacitor 1500uF 400V Diode rectifier FLI 9135 0439 Filter RFI J900 1251 8667 Connector post test point L900 Choke output Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A 06671 80003 06672 80003 06673 80003 06674 80002 06675 80003 Replaceable Parts 87 Table 5 3 Main Chassis Replaceable Parts continued Ref Desig Agilent Part No Description
34. C691 692 Model specific 6571A 6671A 0160 5469 6572A 6672A 0160 5892 6573A 6673A 0160 5579 6574A 6674A 0160 5578 6575A 6675A C695 696 0160 4791 C700 0160 4822 C701 0160 4834 100 Replaceable Parts Agilent Part No Description ELECTRICAL PARTS 0160 4822 Capacitor 1000pF 5 Capacitor 0 22 10 Capacitor 0 1 10 50V Capacitor 1uF 10 50V Capacitor 4 7pF Capacitor 1000pF 5 Capacitor 680pF 10 Capacitor 470pF 5 Capacitor 180pF 5 Capacitor 0 01uF 10 Capacitor 6800pF 5 Capacitor 4700pF 10 Capacitor 3300pF 5 Capacitor 2 2pF Capacitor 0 47uF 50V Capacitor 1uF 1096 Capacitor 2 2uF 10 50V Capacitor 2 3 10 50V Capacitor 1uF 10 50V Capacitor 2 2 10 Capacitor 2 3 10 50V Capacitor 4 7pF Capacitor 2 2pF Capacitor 4 7pF Capacitor 1uF 50V Capacitor 0 22UF Capacitor 0 047uF Capacitor 0 022UF Capacitor 10 5 100V Capacitor 1000pF 5 Capacitor 0 047uF 10 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig Description C704 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C706 C710 711 C712 Model specific 6571 A 6574A 6671A 6674A 6575A 6675A C714 Model specific 6571A 6574A 6671A 6674A 6575A 6675A C715 C716 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6575A 6674A 6675A C717 Model specific 6571 A 6574A 6671A 6674A 6575A 6675A C719 C720
35. ELECTRICAL PARTS continued T900 Transformer power output Model specific 6571A 6671A 9100 4909 6572A 6672A 9100 4946 6573A 6673A 9100 4945 6574A 6674A 9100 4910 6575A 6675A 9100 4944 N 22222222 1 tA z 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A CABLES see Figure 6 2 5080 2172 Cable assy 4 wire 151 to A4 AC Input bd 8120 4944 Cable ribbon front panel display AIDSP1 5080 2166 Cable ribbon A4 AC Input bd to A5 Control bd 5080 2167 Cable phone A2 GPIB bd to A5 Control bd 5080 2168 Cable phone A2 GPIB bd to A1 Front Panel bd 5080 2169 Cable assy 2 wire A2 GPIB bd to A4 AC Input bd 5080 2170 Cable assy 2 wire A3 FET bd to A5 Control bd 5080 2171 Cable assy 2 wire A3 FET bd to A4J400 on A4 AC Input bd 5080 2178 Cable assy 2 wire A3 FET bd to rails on A4 AC Input bd CHASSIS MECHANICAL 0960 0912 Optical Encoders Voltage and Current Controls 5063 2304 LCD Display 5040 1665 Keypad 3101 3088 AC ON OFF line switch 5040 1675 Bezel output 1510 0107 Binding post rear panel gnd post 5001 6740 Bracket GPIB 5040 1673 Bracket polycarb 5001 6766 Bracket A7 Snubber bd 5000 6554 Bracket strap 5041 8801 Bumper foot 06671 00007 06671 00007 5001 6749 5001 6749 06671 00008 06671 00008 5001 6750 5001 6750 5001 6750 Bus bar heat sink Model specific Bu
36. F400 clips 0515 0981 Screw M4 x 0 7 D400 2190 0009 Washer lock internal F400 clips 2190 0586 Washer lock F400 heatsinks 98 Replaceable Parts Table 5 9 A5 Control Board Replaceable Parts Ref Desig Agilent Part No Description ELECTRICAL PARTS C501 0160 5422 Capacitor 0 047 20 C502 503 0160 4805 Capacitor 47pF 5 100V C504 0160 5422 Capacitor 0 047 20 C505 0180 4129 Capacitor 1uF 35V C507 509 0160 5422 Capacitor 0 047 20 C510 0160 4801 Capacitor 100pF 596 C512 0160 5422 Capacitor 0 047 20 C513 0160 4801 Capacitor 100pF 5 C515 0160 5422 Capacitor 0 047 20 C516 0160 4801 Capacitor 100pF 5 C515 517 518 0160 5422 Capacitor 0 047 20 C519 0180 4129 Capacitor 1uF 35V C520 521 0160 5469 Capacitor 10 50V C523 0160 4846 Capacitor 1500pF 100V C524 0160 5422 Capacitor 0 047 20 C530 0180 4129 Capacitor 1uF 35V C531 532 0160 5422 Capacitor 0 047uF 20 C533 0180 4131 Capacitor 4 7uF 35V C550 555 0160 4835 Capacitor 0 1uF 1096 50V C556 558 0180 4129 Capacitor 35V C600 0180 4131 Capacitor 4 7 35V C601 0160 4835 Capacitor 0 1 10 50V C602 0160 4805 Capacitor 47pF 5 100V C603 604 0160 4810 Capacitor 330pF 5 C610 0160 4807 Capacitor 33pF 5 100V C620 0160 4904 Capacitor 6800pF 5 C621 0160 4791 Capacitor 10 5 100V C622 0160 4795 Capacitor 4 7pF C623 0160 4904 Capacitor 6800pF 5 C624 0160 4787
37. R667 0698 3279 Resistor 4 99K 1 R669 0698 0082 Resistor 464 Q 1 0 125W R670 0757 0199 Resistor 21 5K 1 R671 0698 3279 Resistor 4 99K 1 R672 0757 0472 Resistor 200K 1 R674 0757 0465 Resistor 100K 1 R678 Model specific 6571A 6671A 0698 3450 Resistor 42 2K 1 6572A 6672A 0757 0457 Resistor 47 5K 1 6573A 6673A 0698 3450 Resistor 42 2K 1 6574A 6674A 6575 6675A 0698 3162 Resistor 46 4K 1 R679 Model specific 6571A 6574A 0698 3155 Resistor 4 64K 1 6671A 6674A 6575 6675A 0757 0442 Resistor 10K 1 0 125W R680 0698 3279 Resistor 4 99K 1 R682 Model specific 6571A 6671A 0757 0123 Resistor 34 8K 1 6572A 6672A 0698 3450 Resistor 42 2K 1 6573A 6673A 0757 0124 Resistor 39 2K 1 6574A 6674A 0698 3450 Resistor 42 2K 1 6575A 6675A 0698 3162 Resistor 46 4K 1 104 Replaceable Parts Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig R685 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R687 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R688 R689 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R690 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R691 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R692 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6
38. Sheet 3 Held high for approximately 12 seconds at power on then goes low U603 13 VOS Sheet 3 5 0 2V NOTE Temporarily move both scope leads to J503 for TP x J503 1 2 DRV A DRV B Sheet 3 See Figure 6 1 x U630 15 OVCMP Sheet 3 5V 0517 14 OVREF Sheets 1 3 4 2V 65 Q602 C DP CONTROL Sheet 3 CV Mode CC Mode 0 14V 66 U608 7 DP CONTROL Sheet 3 CV Mode CC Mode 13V OV 67 U630 11 PREF 2 Sheets 1 3 1V 68 630 12 DN PGM Sheets 1 3 69 D660 AN DP_TST Sheet 3 OV 79 0630 10 COMPARATOR Mode Mode Sheet 3 1 5V 3 25V 122 Diagrams 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 3 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 8 indicates the sheet number and the coordinates on that sheet where the CVPROG signal line goes 4 Unterminated signal lines go to a least one other location on the same sheet 5 Unless otherwise noted bias connections to integrated circuit packages are as follows pur Common 5V 14 pin packages pin 7 pin 14 16 pin packages pin 8 pin 16 20 pin packages pin 10 pin 20 Diagr
39. few components mounted on the chassis Each block in Figure 4 1 identifies a schematic diagram in Chapter 6 where the circuits are shown in detail You can refer to the schematic to locate specific components mentioned in this description Chapter 6 also has a cabling diagram Figure 6 2 showing the circuit board interconnections INTERFACE CONTROL CIRCUITS A2 GPIB Board 667xA Series Only Circuits on the A2 GPIB board see A2 GPIB Board schematic provide the interface between the GPIB controller and the power supply All 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 ICs decode and execute all instructions and control all data transfers between the GPIB controller and the Secondary Interface on the A5 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 secondar
40. model GOSUB Ps error IF Err THEN PRINT Change pass code to the power supply model or zero then restart the program STOP ELSE GOTO Start END IF END IF Start INPUT Select Initialization I or Factory preset replacement F Sel CLEAR SCREEN SELECT UPC Sel CASE Select Initialization GOTO Init eeprom CASE F Select install new factory data GOTO Fact preset CASE ELSE BEEP GOTO Start END SELECT Init eeprom PRINT Initializing EEPROM FOR I 1 TO 45 OUTPUT Ps DIAG EEPR Addr D Length D Init NEXT I GOTO Cal off Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 4 of 6 Troubleshooting 67 1650 1660 1670 1680 1690 1700 1710 1720 1730 1740 1750 1760 1770 1780 1790 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2020 2030 2040 2050 2060 Fact preset CLEAR SCREEN PRINT This program should ONLY be completed if your power supply PRINT EEPROM has been replaced or a component that will effect PRINT the calibration AND the alignment of voltage overvoltage PRINT and current is complete AND unit has passed the performance PRINT test Enter C to continue any other key to abort INPUT Cont prog IF UPC Cont_prog lt gt C THEN GOTO C
41. 0 99 255 20 10 DATA 6572 161 500 31 500 1768 5 255 0 0 DATA 1296 6572 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 390 Eprom data 6x73 DATA 111 16 35 35 8 0 99 0 53 39 100 61 5 0 DATA 82 1 18 68 79 5 42 0 99 255 20 10 DATA 6573 92 166 322 52 162 759 11768 5 255 0 0 DATA 1296 6573 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 460 Eprom data 6x74 DATA 60 70 61 425 0 82 0 80 70 35 83 0 DATA 99 1 11 4 0 72 0 82 255 20 10 DATA 6574 55 500 90 500 1768 5 255 0 0 DATA 1296 6574 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 530 Eprom data 6x75 DATA 29 85 123 0 82 0 179 84 18 5 0 DATA 99 1 5 069 130 25 144 0 82 255 20 10 DATA 6575 27 646 170 645 1768 5 255 0 0 DATA 1296 6575 0 20 180 20 180 175 33 98 DATA 115 50 20 1 58 Data for word length EEPROM data for 6571A and 6671A EEPROM data for 6572A and 6672A EEPROM data for 6573A and 6673A EPROM data for 6574A and 6674A EEPROM data for 6575A and 6675A INPUT Input Power Supply model number Example 6671A Model Model TRIM UPC Model CLEAR SCREEN RESTORE Eprom data addr Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 2 of 6 Troubleshooting 65 650 660 FOR I 1 TO 45 670 READ Addr I 680 NEXTI 690 700 RESTORE Eprom_data_len 710 720 FOR I 1 TO 45 730 READ Length I 740 NEXT I 750 760 SELECT Model 770 780 CASE 6571A 790 RESTORE Eprom_data_6x71 800 CASE
42. 1 0698 3450 Resistor 42 2K 1 0757 0442 Resistor 10K 1 0 125W 0698 4123 Resistor 499 0 125W 0757 0453 Resistor 30 1K 1 0757 0429 Resistor 1 82K 1 0757 0273 Resistor 3 01K 1 0698 3450 Resistor 42 2K 1 0757 0280 Resistor 1K 1 0 125W 0757 0465 Resistor 100K 1 0698 4479 Resistor 14K 1 0 125W 0698 3456 Resistor 287K 1 0699 0088 Resistor 1 2M 1 0698 8827 Resistor 1 M 1 0 125W 0698 3155 Resistor 4 64K 1 0757 0472 Resistor 200K 1 0698 3279 Resistor 4 99K 1 0683 2255 Resistor 2 2M 5 0 25W 0698 0082 Resistor 464 Q 1 0 125W 0683 1005 Resistor 10 Q 5 O 25W 0698 4123 Resistor 499 Q 1 0 125W 0757 0273 Resistor 3 01K 1 0698 3430 Resistor 21 5 Q 1 0698 3279 Resistor 4 99K 1 0757 0283 Resistor 2K 1 0 125W 0698 3456 Resistor 287K 1 0757 0440 Resistor 7 5K 1 0699 3103 Resistor 19K 0 05 0699 2248 Resistor 47 5K 0 05 0699 2247 Resistor 121K 0 05 0699 2198 Resistor 243K 0 05 0698 3279 Resistor 4 99K 1 5080 2150 GAL programmed main 1826 1370 IC 365 108 Replaceable Parts Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS U504 5080 2250 IC secondary U505 1826 1369 IC voltage regulator U507 1826 2187 IC D A converter 0508 1826 1896 IC linear 0509 1826 2187 IC D A converter 0510 1826 1896 IC linear 0511 1826 2187 IC D A converter 0512 1826 1896 IC linear 0513 1826 1370 IC 365 0517 1826 0161 IC 324 0518 1
43. 6572A 810 RESTORE Eprom_data_6x72 820 CASE 6573A 830 RESTORE Eprom_data_6x73 840 CASE 6574A 850 RESTORE Eprom_data_6x74 860 CASE 6575A 870 RESTORE Eprom_data_6x75 880 890 CASE 6671A 900 RESTORE Eprom_data_6x71 910 CASE 6672A 920 RESTORE Eprom_data_6x72 930 CASE 6673A 940 RESTORE Eprom_data_6x73 950 CASE 6674A 960 RESTORE Eprom_data_6x74 970 CASE 6675A 980 RESTORE Eprom_data_6x75 990 1000 CASE ELSE 1010 PRINT Model number not found Program is for Agilent Models 1020 PRINT 6571A 6572A 6573A 6574A and 6575A 1030 PRINT 6671A 6672A 6673A 6674A and 6675A 1040 STOP 1050 END SELECT 1060 1070 FOR I 1 TO 45 Read model dependent data 1080 READ Init data I 1090 IF 1 21 1 32 THEN Init data I 2 V AL Model 1100 NEXTI 1110 1120 OUTPUT Ps CLS 1130 1140 OUTPUT Ps CAL STATE ON Turn on cal mode 0 passcode Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 3 of 6 66 Troubleshooting GOSUB Ps_error Error if passcode is not 0 IF Err THEN OUTPUT Ps IDN Get data from location ENTER Ps Idn Model V AL Idn POS Idn 1 ELSE GOTO START END IF OUTPUT Ps CAL STATE ON Model Turn on cal mode passcode data at model number location GOSUB Ps_error Error if passcode is not same as data at model location IF Err THEN OUTPUT Ps CAL STATE ON Model 1 4 Turn on cal mode passcode
44. 9 Enter 2 Program 100 samples per trigger by pressing 1 6 9 Enter 3 Setup voltmeter to take measurements in the statistical mode as follows a Pres C O b Press until MATH function is selected then press gt c Press 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 CO 9 b Press v until RMATH function is selected then press Enter c Press amp until MEAN function is selected then press Enter 5 Execute the average reading program by pressing Enter 6 Wait for 100 readings and then read the average measurement by pressing Enter Record this as your result 22 Verification Table 2 6 Performance Test Record Form Test Facility Model Serial No Options Firmware Revision Special Notes Report No Date Customer Tested By Ambient Temperature C Relative Humidity Nominal Line Frequency Hz Test Equipment Used Description 1 AC Source Model No 2 DC Voltmeter Trace No Cal Due Date 3 RMS Voltmeter 4 Oscilloscope 5 Electronic Load 6 Current Monitoring Shunt Verification 23 Table 2 7 Performance Test Record for Agilent Model 6571A or 6671A MODEL Agilent 2 ReportNo Test Description
45. AND USE OVM TO MEASURE VOLTAGE AT SUPPLY S OUTPUT TERMINALS OUTPUT VOLTAGE N RIGHT T T QUE CALIBRATE THE SUPPLY YES NO GO TO SHEET 2 GO TO SHEET 4 Figure 3 1 Overall Troubleshooting Sheet 1 of 4 Troubleshooting 33 FROM SHEET 1 READS RIGHT BUT OUTSIDE SPECS DISPLAY READS WITHIN SPECS VOLTAGE READBACK CIRCUIT A5U503 9504 OR READBACK DAC CIRCUIT 5061 U512 DEFECTIVE YES YES CALIBRATE SUPPLY TURN OFF SUPPLY AND PERFORM A5 CONTROL BOARD TROUBLESHOOTING SETUP TABLE 3 3 TURN ON SUPPLY AND CHECK VOLTAGE AT A5U630 2 43 WITH RESPECT TO COMMON SEE TABLE 6 3 IS CV ANNUNCIATOR ON LOW LEVEL AT TP TURN OFF SUPPLY AND CONNECT A SHUNT SEE TABLE 3 0 ACROSS THE SUPPLY S OUTPUT TERMINALS TURN ON SUPPLY AND PROGRAM FULL SCALE VOLTAGE AND CURRENT CHECK AS5R502 U502 CHECK A50U630 CURRENT RIGHT BUT OUTSIDE SPECS OUTPUT CURRENT WITHIN SPECS CALIBRATE SUPPLY NO V GO TO SHEET 4 CURRENT DISPLAY READS WITHIN SPECS NO READS RIGHT BUT OUTSIDE SPECS CALIBRATE SUPPLY TURN OFF SUPPLY AND PERFORM A5 CONTROL BOARD TROUBLESHOOTING SETUP TABLE 3 3 TURN ON SUPPLY AND CHECK VOLTAGE AT A5U630 3 WITH RESPECT TO COMMON SEE TABLE 6 3 CURRENT READBACK CIRCUIT A5U503 U504 B501 DEFECTIVE
46. B Ac as 04 2 AC4 5 ace 000 13 4 AC 001 aa 29 ACB Dce 15 28 ace DC2 ag lee 809 14 15 pes 18 24 109 Dcz aio 4 ACO 20 01407 19 004 A11 015 20 DOS pas A12 27 R 11 acia D 6 21 50 12 Dcz BS Tar acra 2 A 15 22 A D0 11 DC1 12 25 13 24 AC 9 D 2 13 eo 24 _AC9 D gt 15 003 15 503 ato AC10 16 25 AC 11 D 4 16 004 A11 25 A 11 pcs 17 DCS 171005 aiel D6 18 19 UCC VSS A 12 DQ6 A13 26 ACLI aia 814 RI U108 C129 C133 047 047 047 047 500 500 500 0117 500 50 1000PF R107 500 R109 464 C103 1000PF 500 SECONDARY NC ISOLATION R137 FPRX 100 WN PCLR R138 R136 1 010149 R135 1MHZ PCLR RI DF I_ GND 50 DFI OUT 11 U118 DFI EN t EN DFI INA OUTA OUT1 INB OUTB _ CLAMP1 20 INC 6 OUT3 IND OUTD 2 4SU DS2658N 4 12 13 UR101 R105 C111 18V 10M 10 042 500 C128 2200PF T1 250V Figure 6 6 A2 GPIB Board Schematic Diagram 667xA only R218 R219 Q254 mas 6 04 mm g 0 992 mm 974 C219 M C221 R231 mm m 444 R226 mim mum
47. Capacitor 22pF 5 100V C625 0160 4795 Capacitor 4 7pF C626 0180 4129 Capacitor 35V C630 Model specific 6571A 6573A 0160 4801 Capacitor 100 5 6671A 6673A 6574A 6575A 0160 4787 Capacitor 22pF 5 6674A 6675A C631 0160 4799 Capacitor 2 2pF C632 Model specific 6571A 6573A 0160 4801 Capacitor 100 5 6671A 6673A 6574A 6575A 0160 4787 Capacitor 22pF S 6674A 6675A C655 Model specific 6571A 6574A 0160 4831 Capacitor 4700pF 10 6671A 6674A 6575A 6675A 0160 4819 Capacitor 2200pF 5 Replaceable Parts 99 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig C660 C670 Model specific 6571A 6574A 0160 5098 6671A 6674A 6575A 6675A 0160 4835 C671 0160 5469 C672 0160 4795 C680 Model specific 6571A 6671A 0160 4822 6572A 6672A 0160 4829 6573A 6673A 0160 4808 6574A 6674A 6575 6675A 0160 4813 C681 Model specific 6571A 6671A 0160 4832 6572A 6672A 6573 6673A 0160 4904 6574 6674A 0160 4831 6575 6675A 0160 5410 C682 0160 4799 C683 Model specific 6571A 6671A 0160 5468 6572A 6672A 0160 5469 6573A 6673A 0160 7277 6574A 6674A 6575A 6675A 0160 7308 C684 Model specific 6571A 6671A 0160 5469 6572A 6672A 0160 7277 6573A 6575A 0160 7308 6673A 6675A C690 Model specific 6571A 6671A 0160 4795 6572A 6672A 6573A 6673A 0160 4799 6574A 6674A 6575A 6675A 0160 4795
48. 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 with 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 instruction manual in order to protect against damage to the instrument This sign indicates hazardous voltages This sign indicates an earth terminal sometimes used in the manual to indicate circuit common connected to a ground or mle 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
49. FET switches The OV circuit compares the output voltage level with a signal OVREF that represents the programmed overvoltage level When the output voltage exceeds the programmed value the downprogramming circuits are activated and the FET switches are turned off The downprogramming control circuit generates control signal DP when an OV or INHIBIT condition has been detected or when the output is higher than was programmed DP causes the downprogramming MOSFETS on the A6 Output Filter Board to conduct current away from the load Power Circuits A4 AC Input Board The A4 AC Input Board see A4 AC Input Board schematic includes the following circuits Input Filter and Rectifier The single phase ac input 220 240 vac is applied through chassis mounted line filter FL1 a 25 ampere line fuse A4F400 and filter components on the A4 board to the front panel switch S1 When the switch is turned on filtered ac input is applied to a bias transformer A4T300 via a line voltage select switch A4SW300 and through turn on relay A4K401 contacts and R400 R401 to a bridge rectifier A4D400 The ac line voltage is rectified and filtered to provide 290 volts input lines to the FET Board Because filter capacitors are connected directly across the rectified line large inrush current surges at turn on could blow fuses or affect the operation of other equipment connected to the same ac line This is prevented by the
50. READBACK DAC U512 6 OUTPUT FIG3 8 GAL Figure 3 8 DAC Test Waveforms Troubleshooting 45 START 19 REF THE CV OR DAC IS DEFECTIVE USE THIS TEST TO SOLATE BETWEEN THE FEEDBACK RESISTOR DAC AND THE AMPUFIER TURN SUPPLY OFF AND TURN IT BACK ON AS TO SKIP SELF TEST WAIT FOR POWER ON INIT TO COMPLETE CAC OP AMP PROGRAM CURRENT A5U507 A5US08 LL ce ASUSO9 5050 I PIN 2 gt WITH IS PIN YES RESPECT TO 6 2TO 8 5 IS PIN 2 lt mV WITH RESPECT TO PIN 8 S PIN 6 22 TO sv YES YES 5 NO PIN 2 SHORTED REPLACE DAC TO PIN 87 YES INCONCLUSIVE TEST REPLACE OP AMP Figure 3 9 CV CC DAC and Amplifier Circuit Troubleshooting 46 Troubleshooting START THIS REMOVES THE GPIB OR ISOLATOR BOARD FROM THE DATA PATH CONNECTS THE FRONT PANEL DIRECTLY TO THE CONTROL SOARD THIS CONFIGURATION IS FOR TEST ONLY DO NOT FLOAT THE OUTPUT OR ATTEMPT TO OPERATE OPERATE THE SUPPLY IN THIS CONFIGURATION DISPLAY READS SERIAL DOWN OR SERIAL TIMEOUT SEE NOTE 9 TURN OFF SUPPLY AND REMOVE TOP COVERS AND AFI SHIELD UNPLUG J5 FROM J108 ON THE A2 GPIB BD OR UNPLUG WS FROM J801 ON ISOLATOR BD UNPLUG W4 FROM J502 ON THE AS CONTROL BD PLUG CABLE WS INTO J502 SEE WARNING TURN ON SUPPLY AND TRY TO PROGRAM FROM THE FRONT PANEL TURN OFF SUPPLY REMOVE FRONT PANEL ASSEMBLY TO GAI
51. Signal Names Table of signal name mnemonics Table 6 2 Parts Location A drawing that shows the location of components on a circuit board is located next to the above circuit board schematic diagram A drawing showing location of each circuit board in the chassis is in Chapter 3 Figure 3 19 Test Points Description of each test point Table 6 3 Location of each test point is shown on the the appropriate schematic and its associated parts location drawing Diagrams 117 Table 6 2 Signal Name Mnemonics Mnemonic Description Mnemonic Description A 0 A 15 Address lines MSRQ Microprocessor service request AD 0 AD 7 Address bus NDAC Not data accepted GPIB AMB_SENSE Ambient temperature sense NEG_IMON Negative current monitor ANA 0 ANA 7 Analog signal readback bus NRFD Not ready or data GPIB ATN Attention GPIB OV Overvoltage BIAS_OK 15V bias supplies have stabilized OV_CLR Overvoltage clear BOVPROG Buffered OV programming OVCMP Overvoltage comparator BSTX Buffered secondary transmit OVP_BIAS Overvoltage protection bias cc Constant current status OVPROG Overvoltage programming CCPROG Constant current programming OVSCR Overvoltage SCR crowbar cv Constant voltage status PCLR Primary power clear CVPROG Constant voltage programming PREF Primary reference voltage 2 53V D 0 D 7 Data lines PREF 2 Primary reference voltage 1 0V 0101 0108 Data lines GPIB PREN Primary remote enable DAV Data valid
52. THE DATA PATH AND CONNECTS THE FRONT PANEL DIRECTLY TO THE CONTROL BOARD SEE WARNING TU TH PLY AND TRY TO PROGRAM THE XNOTE perdes Te FRONT PANEL FOR ANALOG PROGRAMMABLE SUPPLIES WS FROM J801 NOTE GPIB BOARD IS ISOLATOR BOARD CHECK A2 GPIB OR ISOLATOR BOARD BIAS CIRCUITS AND PCLR SIGNAL TEST POINTS CT 4 TABLE 6 3 CHECK CABLE W4 SUPPLY OPERATES PROPERLY TURN OFF THE SUPPLY IN ORDER TO ACCESS CIRCUITS ON A1FRONT PANEL BOARD REMOVE A1 FRONT PANEL ASSEMBLY TURN ON THE SUPPLY CHECK 5V BIAS AT R1 6 CONNECT METER COMMON TO Rt 3 SEE FIG 6 8 CHECK THE FOLLOWING DISPLAY VOLTAGES 1 AT At 14 2 2 AT 1 2 DISPLAY amp BIAS VOLTAGES CHECK AICI R1 RTI YES CHECK PCLR RESET A2U2 16 5v CHECK A1U502 U504 A2U800 U804 CHECK 12 MHz CLOCK SIGNAL AT A1U3 66 SEE FIG 3 17 SHEET 2 CHECK AtY1 C3 C4 03 CONNECT EXTERNAL VOLTMETER TO OUTPUT TERMINALS PROGRAM OUTPUT VOLTAGE AND CURRENT AT THE FRONT PANEL AND MEASURE VOLTAGE AT SUPPLY OUTPUT TERMINALS IF THE OUTPUT IS DISABLED PESS OUTPUT KEY 5 OUTPUT VOLTAGE PRESENT LCD DSP1 OR CABLE W2 IS DEFECTIVE A1U3 U4 OR UB DEFECTIVE PERFORM FRONT PANEL SA SEE TABLE 3 6 Figure 3 2 No Display Troubleshooting Troubleshooting 37 START OV WILL NOT FIRE TURN OFF SUPPLY REMOVE TOP COVER AND RF SHIELD TUR
53. Table 2 2 Turn on the power supply under test and program its output voltage to 0 Verification 19 Table 2 5 Constant Current CC Tests continued Action Normal Result Current Sink CC and Readback Accuracy cont Observe the DVM voltage reading Divide this by the resistance of the current monitor resistor to obtain the current sink value Subtract the current value obtained in Step 4 from the current reading on the power supply display Record the difference as the Current Sink Display Readback Value within Current Sink Display Readback limits CC Noise PARD Periodic and random deviations PARD in the output ripple and noise combine to produce a residual ac current superimposed on the dc output current This test measures CC PARD specified as the rms output current over the frequency range of 20 Hz to 20 MHz 1 Turn off the power supply and connect the current monitoring resistor and rms voltmeter see Figure 2 1 Make the test leads as short as possible to reduce noise pickup Measure the residual noise on the RMS voltmeter with the power supply turned off Noise generated by other equipment may affect this measurement and should be removed or factored out 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 Adjust the load in the CV mode for full scale voltage see Table 2 2 as
54. Tables 2 7 through Table 2 11 as master reference sheets to run copies at any time 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 Test Refer To 1 Turn On Checkout Power Supply Operating Manual 2 Voltage Programming and Readback Accuracy Table 2 4 3 Current Programming and Readback Accuracy Table 2 5 Record the results of Tests 2 and 3 in the appropriate Performance Test Record sheets 14 Verification 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 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 Verification 15 1 Table 2 4 Constant Voltage CV Tests Action Normal Result Voltage Programming and Readback Accuracy This test verifies that the voltage programming GPIB readba
55. 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 of 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
56. aaa Sha na S PRI RPG a E na aa ss 7 Instrument Identification a ala kipu ala 8 ReVISIODS hasa M Qa ta in asa h akaqa sa eds eode 8 Firmware Revisions eer USE EE muya ba aaa 8 Safety Considerations ord Ue IRE eee QR 8 C onventloris u us tree rr Da ta hee boat e Er PRO HOOP T sua 9 Blectrostatic Ue 9 iS 19 ss a 1 Introduction rete V dE R 1 sd sick RR RECO e eue RU CPU ates RR 11 Test Equipment Requited oe here erede t ede e peret lp r A eee t ede code 11 Lastof Equipment oU eee RU repete 11 C urrent Montoring ResISEOF inserere EER eue 1 Electr me Load errien ia rr ERN HERR 12 Programming THe Tests e Rete iei eta teet e Ep 13 General Considerations sans taie EE 13 Programming Parameters uae san GAG A EA RERO MEIN 13 General Measurement Techniques sisas t ere teme EH EIN E RH RSS 13 Performance Test Record Sheets sanu ti eee tee ie 13 Operation Verification Tests ss eie EE PURI b dbase aided aes ee I 14 Performance Tests ERA II ete ERE 15 Constant Voltage CV Tests
57. 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 CV Noise PARD 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 Figure 2 1A Set the oscilloscope bandwidth limit to 20MHz 30MHz for the Agilent 54504A and use an RF tip on the oscilloscope probe 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 the front panel display Record the amplitude of the waveform Replace the oscilloscope connection with an ac rms voltmeter Record the reading obtained in Step 5 CV annunciator is on If it is not adjust the load to slightly reduce the output current until the annunciator comes on Amplitude is within the specified PARD Peak to Peak limits 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 0 1 or 100mV whichever is greater of its final value following a 50 change in output load current Measurements are ma
58. ark AAA 58 x87 on EVA 9021 1 8021 Eu pu 58 88 AAA 23 pm 1166 6690 En 0 2 554 V o 5238 No T sped NE Sl 9 9 81 8 A C29 epo 585 5168 588 R 8 225 RAS 9990 6981 225 SAS 9990 6981 LEHSPOPIN Sg LEHSPOPIN e XN 2 p e E B lt 7266 6690 s 8 25 V Yv 2 Zog rs S 4 4 1620 9061 1620 9061 266 6690 9959 6690 lt S goza V XH V 599 as e ANV 4 09 eyed bbe BS 19420910 9288 0910 wots 4 8 20 258590 A0001 9 58 lt N lt lI V 91 S 44001 N lt o 9 228 9560 ANN 1 orio 45292 gt nd x 228 80 8020 30 298 025 20 02 2 gs 16440910 gt 98 0686 6690 e lt 98 008 9020 j 91 1061 9820 AAA 7160 1910 alts 2068 E S gt 9 9722 0910 e TNS 8 HX ASZ G 0 8029 8 1 e 5069 5968 6690 966 6690 V WIP V 9 e e e AAA e Hed mo gt lt 8 a RI o oz 222 333 8 2 32 1 la S9 lw X lt ZZ 22850 e 88 55 8 8 8 js 225 4966 6690 4766 6690 Zaz o V yl V y Fo 5 ev A A s 5 5 s 8 L vum wu pee 4 2024 VOZH 001 1910 2891 0690 30 2 roel 528 0 Dv Urs 4 9 al 5 06 2049 6624 8009 a ri zt 5 1091 9281 amp i 58
59. at test points through s 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 110 STX Primary transmit to secondary serial data line Toggles between 0 U110 3 y Y gg 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 45V A2 Isolator BOARD 657xA Series Only C803 Primary chassis ground U805 3 5V primary bias 5V 0 2 7800 2 SPCLR Held low for approximately 40 ms at power on then goes high J801 2 PCLR also called RESET Held low for approximately 40 ms at power on then goes high 3801 4 TxD Primary transmit to secondary serial data line Toggles between 0 and 5V 6 7801 3 RxD Primary receive from secondary serial data line Toggles between 0 and 5V J800 4 Rx Primary receive from front panel serial data line Toggles between 0 and 5V J800 3 BSTx Primary transmit to front panel serial data line Toggles between 0 and 5V Diagrams 119 Table 6 3 Troubleshooting Test Points continued TEST POINT Signal Tested Measurement and Conditions No amp Loc C307 15 Vp primary bias common Connect meter or scope
60. 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 Program to initialize EPROM or move factory preset data in 657xA and 667xA power supplies RE STORE INIT 2KW Rev A 00 00 dated June 28 1993 DIM Init data 1 45 Model 5 Idn 21 Cal data 40 INTEGER Addr 1 45 Length 1 45 ASSIGN GPs 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 57 140 DATA 64 68 72 76 80 150 152 153 154 155 Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 1 of 6 64 Troubleshooting 150 DATA 156 158 160 162 163 164 165 166 167 168 160 DATA 169 170 171 172 174 170 180 Eprom_data_len 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 2 1 1 1 1 DATA 2 2 2 1 1 1 1 1 1 1 DATA 1 1 1 2 1 250 Eprom data 6x71 DATA 459 70 8 19 0 83 0 14 561 39 45 225 23 0 DATA 98 3 88 65 0 10 0 83 255 20 10 DATA 6571 455 168 13 7 163 1768 5 255 0 0 DATA 1296 6571 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 320 Eprom data 6x72 DATA 181 75 038 20 475 0 99 0 31 88 988 102 375 0 DATA 82 1 35 416 18 24
61. common here Then make measurements at test points through R317 15 Vp primary bias 15 0 9V C352 26V 24 4V to 28 6V C315 Secondary common Move meter or scope common here Then make measurements at test points through zz R333 5V secondary bias 5 0 2V R331 15V secondary bias 15 0 9V C353 26V 24 4V to 28 6V R330 15V secondary bias 15 0 9V C354 25V 22 5V to 27 5V U310 6 RELAY ON U308 6 RESET U308 7 BIAS OK 5V U308 1 PREF 2 5V U308 5 RESET Held low for approximately 50 ms at power on then goes high U311 7 FAN DETECT 43V D317 25V 43V U311 2 FAN PWN 0 6V A3 FET Board Note Test points Gs through Gs are the FET Board Troubleshooting procedures at these points are given under Dynamic Troubleshooting section of the FET Troubleshooting Chart Table 3 4 120 Diagrams Table 6 3 Troubleshooting Test Points continued TEST POINT No amp Loc Signal Tested Measurement and Conditions A5 Control Board 558 0505 6 0517 7 0508 6 0510 6 0615 1 0615 7 0630 2 0618 1 0617 6 0612 7 0612 1 0630 3 06211 0607 7 GD U607 1 63 0602 9 U605 3 Ga U602 6 Secondary common Sheet 1 Connect meter or scope common here Then make measurements at test points through and through CC CC DACs reference 10 0 05 Sheet 1 Readback DAC reference 11 6 0 1V Sheet 1 CVPROG Sheets 1 2 Approximately 4 6V
62. connectors A1J4 and 115 3 Remove nuts securing the AIG1 AIG2 controls to the board and remove controls 70 Troubleshooting A1KPD Keypad 1 Remove the Front Panel Board as described in that procedure 2 With board removed keypad can easily be lifted out of the Front Panel Assembly Rear Panel and or A2 GPIB or Isolator Board To remove these two assemblies together proceed as follows Disconnect the cables from the following connectors on the A2 board a Ac bias cable W6 from P101 or J803 on 657 b Phone cable W4 from J107 or J800 on 657xA c Phone cable W5 from J108 or J801 657 Remove the AC input safety cover 2 screws and line cord connections on rear panel Remove the DC output safety cover 4 screws and the Output and LS sense connections on the rear panel Remove the quick disconnect plug if present from the analog connector near OUT terminal on rear panel Remove two screws securing the plastic output name plate to the bus bars Remove two screws securing the heatsink assembly brackets to rear panel Remove the nut securing the ground wire to the Output Signal ground terminal on the rear panel Remove two screws one on each side securing the rear panel to the chassis and remove the Rear Panel A2 board Qo cM QN D IND To remove only the A2 board proceed as follows Disconnect cables from the A2 board as described in Step 1 Remove two screws securing A2 board to rear panel
63. cq a R265 mm R230 mum J 0 e U202 Bg E 8102 LE M R23 C237 204 141 7 24 1 0122 6004 mm 92 2 2904 mum m COZY m SEN N 8205203 206 0 0911000 N R212 mm C235 R261 mm R203 Hi ra re suo STe L H 609 ma nu y GO GLY wm 2 ESZA 9 01 1244 15029 Mum 6 Gp mm mm CZY 9770 mm 1004 9061 mm mapy OVC mm 6 08 mm mm 6964 mm 0 4 0213 D216 D214 0209 mM 0207 HH HH Figure 6 7 A3 FET Board Assembly Diagram and Test Point Locations LAYER 1 COMPONENT SIDE 8262 6690 2191 2061 Figure 6 8 FET Board Schematic Diagram RAIL
64. 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 SWITCHING 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
65. 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 Hazardous voltages may be present at the power supply output during these tests They should be performed only 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 for system power supplies Table 2 2 Programming Voltage and Current Values Agilent Model Full Scale Max Prog Full Scale Max Prog Max Prog CC Voltage Voltage Current Current Overvoltage Current Agilent 6571A 6671A 8V 8 190V 220A 225 23A 10V 10A Agilent 6572A 6672A 20V 20 475 V 100A 102 37A 24V 10A Agilent 6573A 6673A 35V 35 831V 60A 61 43A 42V 5 Agilent 6574A 6674A 60V 61 425V 35A 35 83A 72N 4A Agilent 6575A 6675A 120V 122 85V 18A 18 43A 144V 2 5A General Measurement Techniques Figure 2 1 shows the setup for most tests Measure the dc output voltage directly at the sense S and S terminals Connect these terminals for remote sensing to the LS and LS terminals Be certain to use load lea
66. operation due to a rising but yet unstable 5V is prevented until the 5V BIAS voltage fully settles When power is turned off or is removed SPCLR goes low immediately to disable the microprocessor in order to provide a graceful shutdown of the power supply as the 5V falls to zero volts Note PCLR is generated in the GPIB Board for Agilent 667xA models For Agilent 657xA models it originates at the main board secondary circuits and is routed to the Isolator Board The isolator board includes three separate optical isolator circuits that isolate the front panel signals RxD TxD and PCLR signals from the SRx BSTx SPCLR signals at the secondary interface circuits A1 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 Circuit details are shown on the Al Front Panel Board schematic Front Panel Circuit Board A1 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 A5 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 electrically erasable programmable r
67. the top cover and RFI shield see Disassembly Procedures Remove the A5 Control Board from the output subchassis see Disassembly Procedures Lay the board component side up on a piece of insulating material adjacent and close to the supply Make the following connections a Ribbon cable W3 from A5J509 to A4J500 b Phone cable W4 from A5J502 to A2J107 c Testcable 2 wire cable assembly Agilent P N 5080 2169 from A5J503 to A3J200 d Make a 12 inch test jumper cable from two 20 pin connectors Agilent P N s 1251 8666 and 1251 8667 and 20 feet of wire 24 26 AWG Use the cable to connect A5J510 to A6J900 You may now proceed with the specific tests for the A5 Control Board F OTH 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 Note If any power FET Q201 204 Q211 Q222 Q233 or Q244 is defective you must replace 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 A3 FET board with its heatsink assembly att
68. time delay action of one of the turn on relays AK400 During the turn on period approximately 10 seconds relay A4K400 is deenergized and presents a higher input resistance that limits inrush current After the turn on period relay A4K400 energizes and decreases R400 R401 input resistance Bias Supplies and Bias Detect The secondary windings of the bias transformer A4T300 provide ac inputs to the 15Vp primary bias supply components 0313 0316 0302 the 15V secondary bias supply components D306 D309 0305 0306 and the fan voltage supply components D310 D317 In addition the bias transformer applies ac power to the 5V Primary Interface Bias Supply on the A2 GPIB or Isolator Board The 15Vp bias voltage is used to operate the turn on relays K400 K401 an Isolation Optoisolator U309 and by circuits on the FET Board The 15V bias voltage is used by the fan speed control circuits and also powers the 5 V and 14V bias voltages used by circuits on the A5 Control Board The purpose of the Bias Detect Circuit U308 is to disable the power supply output until the bias voltages have stabilized When power is initially applied the circuit generates a RESET signal to disable the supply s output and to initialize the secondary interface microprocessor on the A5 Control Board When the bias circuit has stabilized the Bias Detect Circuit detects a BIAS_OK signal from the A5 Control Board and removes the RESET signal to enable the p
69. title page Note 1 If the 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 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 supply s firmware resides in the main board microprocessor chip and in ROM chips on the A2 GPIB and A1 Front Panel boards You can obtain the firmware revision number as follows bench power supply you will find the revision numbers printed on the label affixed to the integrated circuit Fora GPIB system power supply you can read the integrated circuit label as above 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 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 grou
70. 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 specifications 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 CUSTOMERS 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
71. 0 509 R376 D319 V 1505 lt AAA J500 8 10 Geen 714 3V J500 4 RELAY ON J500 3 1505 4 9J500 5 715Ug 4 9 J500 1 4500 15 17505 LM317T R331 0306 NOTES 0 LM337T R328 2 74K R399 5x 1 44 Rz20 t C322 A 243 4 4 2 1 5330 AA 0 1 ALL RESISTOR VALUES ARE IN OHMS 1 1 8W UNLESS OTHERWISE SPECIFIED 2 ALL CAPACITOR VALUES ARE IN MICROFARADS UNLESS OTHERWISE SPECIFIED 3 PARTS NOT MOUNTED ON THE BOARD ARE SHOWN WITHIN DOTTED LINES RT300 RT300 R339 4 64K J500 9 RESET J500 10 BIAS OK THRESHOLD 2 53U J500 11 PREF R383 AA y VJ500 16 RESET 100 NOT LOADED R351 AS DETECT C 4 5U NOM J500 13 PWM J500 14 FAN DETECT Figure 6 10 A4 AC Input Board Schematic Diagram 45 602519 20 42 66 65 C835 ro Cqo4 o R 11 610 H 512 00000000 57 0504 697 R835 692 R694 693 ossa op pees oo U630 Rgo2 o C4R710 R696 D615 U503 4
72. 0160 7606 Qty 1 Circuit Ref C452 C30 C33 C1 C5 C133 C137 C5 C8 C9 C500 C502 C420 C421 C423 C497 C498 CHANGE 23 In Table 5 10 CHANGE Q201 204 211 222 233 244 from POWER FET Agilent P N 1855 0849 Qty 8 to FET MACHED Set Agilent P N 5080 2241 QTY 1 CHANGE 24 In Table 5 6 CHANGE Diode Zener VR102 FROM 11V 2 Agilent P N 1902 3172 to 11V 596 Agilent P N 1902 0959 Qty 1 CHANGE 25 In Table 5 9 CHANGE Microprocessor U504 from Programmed Agilent P N 5080 2155 to Masked Agilent P N 1820 8600 Qty 1 CHANGE 26 In Table 5 9 ADD Label Fuse warning Agilent P N 7120 4827 Qty 1 For 6002A only Qty 2 CHANGE 27 In Table 5 9 CHANGE Thermistor 10K 25C Reference Designator 0837 0397 to Agilent P N 0837 0412 Qty 1 CHANGE 28 In Table 5 11 CHANGE Microprocessor U504 from programmed Fabricated Agilent P N 1820 5996 to Mask Purchased Agilent P N 1821 0223 Qty 1 Backdating 151 CHANGE 29 In Table 5 11 CHANGE 1 Microprocessor Masked U504 from Agilent P N 1821 0223 to Agilent P N 1821 0943 Qty 1 2 Firmware Secondary from Rev A101 03 to Rev A 01 05 3 READ ONLY MEMORY FRONT PANEL 5080 2208 CHANGE 30 In Table 5 11 CHANGE ROM Front Panel U4 Firmware from Rev A 01 07 to Rev A 01 08 CHANGE 31 In Table 5 7 CHANGE 1 Heat sink Ref D400 from Agilent P N 12050766 to Agilent P N 1205 0861 Qtv 1 2 Heat sink Ref D400 from Agilent P N 1205 0766 to Ag
73. 0K 5 0 25W R379 0698 3155 Resistor 4 64K 1 R380 0698 3620 Resistor 100 5 2W R381 0698 4150 Resistor 115 Q 1 0 25W R382 0683 3305 Resistor 33 Q 5 0 25W R383 0757 0401 Resistor 100 Q 1 0 125W R384 0757 0280 Resistor 1K 1 0 125 W R399 0699 0208 Resistor 1 5 0 25W R400 401 0699 3191 Resistor 27 5 20W R404 0764 0028 Resistor 100K 5 2W R409 0811 1918 Resistor 30K 5 10W R414 0811 1666 Resistor 1 5 2W RT300 0837 0412 Thermistor SW300 3101 2828 Switch DPDT line voltage select T300 9100 4908 Transformer bias GPIB U302 5060 2942 Assembly IC and heatsink 1826 0393 IC LM317T U302 U304 5060 3324 Assembly transistor and heatsink 1853 0490 Transistor PNP U304 U305 5060 3325 Assembly IC and heatsink 1826 0393 IC LM317T U305 U306 5060 2943 Assembly IC and heatsink 1826 0527 IC LM337T U306 U307 5060 2948 Assembly IC and heatsink 1826 0122 IC UA7805UC U307 U308 1826 2341 IC voltage sense U309 1990 1351 Optoisolator U310 1858 0047 Transistor array 16P DIP U311 1826 0346 IC op amp 5080 2172 Cable assembly SW 300 Replaceable Parts 97 Table 5 8 A4 AC Input Board Replaceable Parts continued Ref Desig Agilent Part No Description MECHANICAL PARTS 2110 0726 Fuse clip F304 308 401 2110 0870 Fuse clip 13 32 F400 1205 0282 Heatsink U302 306 307 1205 0402 Heatsink U304 305 0590 1397 Nut F400 clips 0515 0070 Screw M4 x 0 7
74. 0V Polyester Foil Agilent P N 0160 0162 to 0 022uF 5 400V Polypropylene Foil Agilent P N 0160 5927 Qty 2 CHANGE 18 In Table 5 9 CHANGE Insulator REF Y501 from 43300145 Bead Qty 2 to 0340 1277 Insulator Component Qty 1 CHANGE 19 In Table 5 3 ADD Service Manual Agilent P N 5959 3384 Qty 1 FOR MODEL OPTION 6672A 910 FOR MODEL OPTION 6673A 910 FOR MODEL OPTION 6675A 910 CHANGE For MODEL OPTION 6672A 910 For MODEL OPTION 6671A 910 For MODEL OPTION 6674A 910 Service Manual from Agilent P N 5959 3337 to Agilent P N 5959 3384 Qty 1 CHANGE 20 In Table 5 3 CHANGE Operating Manual from Agilent P N 5959 3352 TO Agilent P N 5959 3372 Qty 1 CHANGE 21 In Table 5 3 CHANGE Line Cord 12ga WCSA without plug from Option 931 to Option 831 Line Cord 4mm Harmonized without plug from Option 932 to Option 832 Line cord 10ga Canadian without plug from Option 934 to Option 834 Line Cord 12ga UL CSA with NEMA 6 20p plug from Option 941 to Option 841 Line Cord 4mm Harmonized with IEC 309 plug from Option 942 to Option 842 Line Cord 12ga Japanese with JIS C8303 plug from Option 943 to Option 843 150 Backdating Line Cord 10ga Canadian with NEMA 6 30P plug from Option 944 to Option 844 Line cord family drawing 8120 9296 from Rev B to Rev CHANGE 22 In Table 5 11 CHANGE Capacitor Metalized Polyester Dielectric from 1 20 Agilent P N 0160 4962 to 1 Agilent P N
75. 116 9 3346A 00391 35 3216A 00141 7 All 15 16 19 20 21 3239A 00176 12 22 23 24 25 36 3239 00226 14 3501 00941 38 3345A 00356 35 3619A 01161 39 All 19 22 36 3632A 01225 40 3501A 00796 38 Model 6675A 3620A 01006 39 3634A 01086 _40 3138 00101 713 Model 6674 3149 00116 9 3216 00136 7 3126 00131 1 13 3234 00156 12 3144 00181 2 3242 00191 14 3146 00191 3 5 9 3350 00221 35 3208 00103 5 19 22 36 3215 00251 7 3502 00551 38 3216 00261 12 3619 00796 39 3216 00331 _14 3632A00932 _40 CHANGE 1 In Table 5 9 CHANGE Capacitor from 100pF 5 Agilent P N 0160 4801 to resistor zero ohm Agilent P N 8159 0005 Circuit Reference C506 NOTE The resistor will be inserted where the capacitor was Wire Agilent P N 8150 2408 is hand wired from J509 pin 16 to U502 pin 12 In Table 5 7 DELETE Resistor 100 ohms 0 1 0 125 watt Agilent P N 0757 0401 R383 CHANGE 2 In Table 5 3 CHANGE From 5060 3422 to 5060 3367 CHANGE From 5060 3334 to 5060 3385 CHANGE 3 In Table 5 9 ADD 1 Resistor R550 4 99K 1 1 8W Agilent P N 0698 3279 Qty 1 Located in C506 position 2 Jumper 26ga Agilent P N 8150 2408 or equivalent Qty 1 5inch between C741 and R550 DELETE Resistor REF C506 Zero Ohm Agilent PIN 8159 0005 Qty 1 146 Backdating CHANGE 4 In Table 5 9 DELETE IC Socket 40 Pin REF U504 Agilent P N 1200 0552 Qty 1 ADD 1 Resistor R885 2 0K 1
76. 130K 1 0699 2246 Resistor 25K 0 05 0699 1513 Resistor 40K 0 05 0 1W 0699 2248 Resistor 47 5K 0 05 0699 1510 Resistor 22 22K 0 05 0698 7163 Resistor 2 0081K 0 1 0699 0924 Resistor 11K 0 1 0698 3956 Resistor 42 5K 0 1 0698 6342 Resistor 90K 1 106 Replaceable Parts Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig Agilent Part No Description R740 741 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R750 R752 R761 762 R765 R766 R767 Model specific 6571 6573 6671 6673 6574 6674 6575 6675A R768 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R769 R770 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R785 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R790 791 R792 793 R794 795 R801 R802 R803 R804 R805 Model specific 6571A 6671A 6572A 6575A 6672A 6675A ELECTRICA 0757 0280 0757 0429 0698 3279 0757 0442 0757 0447 0698 8093 0757 0199 0698 3430 8159 0005 0698 8093 0699 1741 0699 0055 0699 1741 0757 0410 0699 0083 0699 0211 0698 7163 0698 3279 0698 3155 0757 0429 0757 0419 0757 0472 0757 0473 0698 4536 0757 0471 0698 3455 0698 8093 0698 6414 0698 6323 0757 0447 0757 0468 0757 0462 0757 0468 0699 3103
77. 15 0375 Screw M3x0 5 16mm qty 4 0515 0664 Screw M3x0 5 12mm qty 9 5188 4201 Thermal Pad FET to heastsink 5188 4202 Insulator PCA to heatsink 5002 2818 Heatsink Note All other parts are surface mounted and are not field repairable Replaceable Parts 95 Table 5 8 A4 AC Input Board Replaceable Parts Ref Desig Agilent Part No Description ELECTRICAL PARTS C304 0160 4834 Capacitor 047uF 10 C305 0180 3458 Capacitor 4700 50V C306 307 0180 4129 Capacitor 35V C309 0180 4136 Capacitor 10uF 20V C310 0160 4834 Capacitor 047uF 10 C311 0180 3458 Capacitor 4700 50V C312 0180 3587 Capacitor 1000 50V C313 315 317 318 0180 4129 Capacitor 35V C320 322 0180 4131 Capacitor 4 7 35V C351 0180 3458 Capacitor 4700 50V 352 354 0180 0230 Capacitor 50 C357 0160 4554 Capacitor 01uF 20 C358 359 0160 4835 Capacitor 0 1 10 50V C360 361 0180 3587 Capacitor 1000UF 50V C420 421 423 0160 7606 Capacitor 1 250V C425 426 0160 4439 Capacitor 4700pF C427 0160 4065 Capacitor 0 1 C430 0160 4355 Capacitor 0 01 10 C431 0160 4065 Capacitor 0 1 C497 498 0160 7606 Capacitor 250V CR402 1990 0517 LED visible D306 310 312 317 1901 0731 Diode power rectifier D318 319 1901 1098 Diode 1N4150 D400 1906 0389 Diode full wave bridge E403 404 411 412 1251 5613 CONN SGL CONN F304 2110 0304 Fuse 1 5AT 250V
78. 2 Circuit Board Cabling Diagram Diagrams 125 Figure 6 3 A1 Front Panel Board Component Location Diagram 126 Diagrams 50 50 R27 R30 R29 R28 047 2 2 1 50V 20V 4 64K lt 4 64K lt 4 64K lt 4 64K R37 HICO HIC 1 HIC2 HICZD 50 C15 A 6 8 2 5 4 3 2 G1 2411 5U 1 2 HI 3 047 3 5 4 HIC2 04 3 sl RPG SHIELD ucc SU 25 11 aco 4 as See EO MTG 50 1 5 8 4 45 1 a 9 Paps 5 2 HIO C7 15 5 521 3 apris tto a 4 HICO eapc2 gt _ 15 52 asas ce 042 lapcz 18 S 1 11 au anca 1205 la L1 04 A7 B Tapcs 20 29 Ag 2 iso EIGEN anc21 22109 ang 248 5 C17 AD 07 f10 S3 8410 4 11 EZ 8 4 7 2 2 50 22 12 5 12 1 3 GUARDING AC13 LCD DISPLAY MTG 5L 414 31 A 14 peg Peps 5 2 UPP 1 pu HZ 7 2 41 i6 mo Du Ti ze 6 Ld V 270256 9 8 12MHZ 1 9 HO 3 5 10 rd rud eee 2 V 3 12 54 ER 2 1 2 H
79. 20 028V Vout 40mV Vou 1 05mV Vou 1 05mV Constant Current Tests Current Programming and Readback Low Current Lut Front Panel Display Readback High Current 100A Lu Front Panel Display Readback Current Sink 10A Display Readback PARD Ripple and Noise RMS Load Effect Source Effect 60mA Tour 100 99 84A Tour 200mA Linx 110mA 0 Tour 12mA La 12mA 60mA Tout 100mA 100 16A Tour 200mA Lig 110mA 100mA Tout 12mA La 12mA Enter your test results in this column Verification 25 Table 2 9 Performance Test Record for Agilent Model 6573A or 6673A MODEL Agilent 2 ReportNo Test Description Maximum lee RN Constant Tests Voltage Programming and Readback Low Voltage OV Vou 35mV 35mV Front Panel Display Readback Vout 50mV Vout 50mV High Voltage 35V Vout 34 951V 35 049V Front Panel Display Readback Vou 67 5mV Vou 67 5mV Load Effect Vout 1 9mV Vou 1 9mV Source Effect Vout 1 9mV Vout 1 9mV PARD Ripple and Noise Peak to Peak RMS 21 Transient Response Time at 900 us Constant Current Tests Current Programming and Readback Low Current 0A Iout 40mA 40mA Front Panel Display Readback Tour 60mA Tour 60mA High Current 60A L 59 9A 60 1A Front Panel Display Readback Tour 120mA Tour 120mA Current Sink 5A Display Readback Liu 65mA Liu 65mA PARD Ripple and Noise 0 40mA RMS Load Effect Tout 7mA Source
80. 2A 6675A R703 Model specific 6571A 6671A 6572A 6575A 6672A 6675A R710 R712 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R713 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R715 R717 R718 R719 Model specific 6571A 6671A 6572A 6574A 6672A 6674A 6575A 6675A R720 R721 722 R723 724 R730 731 Model specific 6571A 6671A 6572A 6672A 6573 6673A 6574 6674A 6575A 6675A R732 733 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6575A 6674A 6675A Agilent Part No Description ELECTRICAL PARTS 0699 0070 Resistor 3 16 M 1 0699 0088 Resistor 1 2 M 1 0757 0429 Resistor 1 82K 1 0757 0280 Resistor 1K 1 0 125W 0699 1254 Resistor 536K 0698 3162 Resistor 46 4K 1 0698 3155 Resistor 4 64K 1 0757 0460 Resistor 61 9K 1 0757 0458 Resistor 51 1K 1 0698 3454 Resistor 215K 1 0757 0469 Resistor 150K 1 0757 0280 Resistor 1K 1 0 125W 0698 8827 Resistor 1M 1 0 125W 0699 0088 Resistor 1 21M 1 0683 2755 Resistor 2 7M 1 0 25W 0683 6855 Resistor 6 8M 5 0 25W 0698 3279 Resistor 4 99K 1 0699 0070 Resistor 3 16M 1 0699 0461 Resistor 30K 0 1 0 1W 0699 0460 Resistor 85K 0 1 0 1W 0699 1211 Resistor 95K 0 1 0699 2295 Resistor 100K 0 1 0 1W 0699 2247 Resistor 121K 0 05 0699 0461 Resistor 30K 0 1 0 1W 0757 0468 Resistor
81. 3 01K 1 0757 0407 Resistor 200 Q 1 0 125W 0757 0273 Resistor 3 01K 1 0698 3279 Resistor 4 99K 1 0698 4479 Resistor 14K 1 0 125W 0757 0465 Resistor 100K 1 0757 0442 Resistor 10K 1 0 125W 0698 3155 Resistor 4 64K 1 0698 3162 Resistor 46 4K 1 0757 0429 Resistor 1 82K 1 0757 0434 Resistor 3 65K 1 0698 3450 Resistor 42 2K 1 0757 0407 Resistor 200 Q 1 0 125W 0698 4486 Resistor 24 9K 1 0757 0472 Resistor 200K 1 0757 0434 Resistor 3 65K 1 Replaceable Parts 103 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS R638 0699 0070 Resistor 3 16M 1 R639 0757 0407 Resistor 200 Q 1 0 125W R640 0757 0442 Resistor 10K 1 0 125W R641 0699 0070 Resistor 3 16 M 1 R642 643 0757 0472 Resistor 200K 1 R644 0757 0280 Resistor 1K 1 0 125W R645 0757 0442 Resistor 10K 1 0 125W R650 0757 0453 Resistor 30 1K 1 R651 652 Model specific 6571A 6671A 0757 0453 Resistor 30 1K 1 6572A 6672A 0757 0462 Resistor 75K 1 0 125W 6573A 6673A 0757 0468 Resistor 130K 1 6574A 6674A 0757 0473 Resistor 221K 1 6575A 6675A 0698 3260 Resistor 464K 1 R653 0757 0453 Resistor 30 1K 1 R662 663 0757 0410 Resistor 301 1 0 125W R664 0698 3155 Resistor 4 64K 1 R665 666 Model specific 6571A 6671A Not used 6572A 6672A 0757 0199 Resistor 21 5K 1 6573A 6673A 0757 0441 Resistor 8 25K 1 6574A 6674A 0757 0447 Resistor 16 2K 1 6575A 6675A 0698 3157 Resistor 19 6K 1
82. 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 SV 9FFP Serial Link 20109 3 0104 Microprocessor A2U 114 24 9FFP A2U 114 25 UF39 Digital Control Interface A2U118 1 9AF1 A2U118 9 40A5 A2U 118 10 1029 A2U118 15 0010 A2U118 16 040A Gated Array Logic A2U119 2 0A55 A2U119 5 0040 A2U119 15 0040 5 After completing the tests be sure to return the J106 jumper to its original position read Edge A2 Board A1A1 Front Panel A10 Board Input Setting Connection Board Connection Connection clock LA 2065 42 9 U504 32 START gt J106 6 J2 11 U502 7 STOP J106 6 42 11 U502 7 GROUND J106 4 J2 8 U502 10 Figure 3 16 Signature Analysis Signal Inputs 58 Troubleshooting U3 PIN OUTS TOP VIEW LOOKING DOWN ON COMPONENT SIDE OF PC BORRD 1 Front Panel 0504 1 US 4 32 1 504 15 SA MODE CLOCK START STOP 564 28 GROUND B 900000007 00000900 C A5 Control Board Figure 3 17 Signature Analysis Connections for Model 657xA Only Troubleshooting 59 114 PIN OUTS jo 5087 i 25 HET 9 Qi R imi 0 E f 39 2 6 33 ER 3 9 9 9 0 if tad GROUND ST
83. 3 6 TURN OFF SUPPLY AND REMOVE TOP COVER AND AFI SHIELD PERFORM A5 CONTROL BOARD TROUBLESHOOTING SETUP TABLE 3 3 DISABLE THE OV INPUT BY LIFTING A5R691 TURN ON SUPPLY AND CHECK THE OUTPUT VOLTAGE GO TO OUTPUT HELD HIGH TROUBLESHOOTING FIG 3 6 OV STILL OCCURS CHECK ASR691 R696 CHECK VOLTGES AT A5USIT 14 84 ASUB30 10 AND ASUB30 15 63 WITH RESPECT TO COMMON 30 DOES 51 517 14 14V NO A Go To SHEET 2 IS A6U630 10 gt 05V CHECK 5 680 0480 R893 IS A5U630 15 HIGH CHECK 5 830 R884 FTO3 4A GAL CHECK A6U502 C665 R665 Figure 3 4 OV At Turn On Troubleshooting Sheet 1 of 2 Troubleshooting 39 FROM SHEET 2 CHECK OV PROG SIGNAL A5UB17 12 YES CHECK 50517 NO CHECK FOR PRESENCE OF OV PROG SIGNAL PULSES AT A5U504 15 amp A5U502 18 A5U504 15 PULSING CHECK A5U502 U504 ves 50502 18 PULSING CHECK A5U502 CHECK A5R533 R5365 C531 C532 Figure 3 4 OV At Turn On Troubleshooting Sheet 2 of 2 40 Troubleshooting START OUTPUT HELD Low THE SUPPLY S OUTPUT IS HELD LOW AND THE PROT ANNUNCIATOR IS NOT ON TURN OFF SUPPLY DISCONNECT THE LOAD REMOVE THE TOP COVER AND RFI SHIELD TURN ON SUPPLY AND CHECK THE BIAS AND REFERENCE VOLTAGES TEST POINTS THROUGH SEE TABLE 6 3 ARE VOLTAGES TROUBLESHOOT THE DEFECT
84. 3A 6574A 6674A 6575A 6675A R911 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R912 Model specific 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A R915 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R916 R917 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R933 Model specific 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A R934 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R935 Model specific 6571A 6573A 6671A 6673A 6574A 6674A 6575A 6675A R936 Model specific 6571A 6671A 6572A 6575A 6672A 6675A Agilent Part No Description ELECTRICAL PARTS 0698 3311 Resistor 51 5 2W Mo Not used 0698 3642 Resistor 3K 5 2W Mo 0764 0034 Resistor 47K 5 2W Mo 0699 1060 Resistor 0 05 Q 1 3W 0699 1075 Resistor 0 1 1 3W 0812 0019 Resistor 0 33 5 3W PW Not used 0699 1060 Resistor 0 05 Q 1 3W 0699 1075 Resistor 0 1 Q 1 3W 0757 0273 Resistor 3 01K 1 0698 3358 Resistor 4 02K 1 0698 0082 Resistor 464 Q 1 0 125W Not used 0764 0016 Resistor 1K 5 2W Mo Not used 0698 3646 Resistor 12K 5 2W Mo Not used 0698 0082 Resistor 464 1 0 125W 0698 0082 Not used Not used 0698 0082 Resistor 464 Q 1 0 125W Not used 0757 0290 Resistor 6 19K 1 Not used Not used 0757 0451 Resistor 24 3K 1 Replaceable Parts 113 Table 5 10 A6 output Filter Board Replaceable Parts continued Re
85. 5010 10600000 512 91 Ho 601 0 4 04 GHC518 R513 o R8z7 o 0602 00 516 9 o R612 0000000 734 1 U602 6023309 R624 2000900 00000000 d 22505 00900 10099 871 15050000 G4D612 41640610 R663 R665 0509 9502 Bo OS 200 502 rad fr a C 52 9518 0510 cso 39 37 36 64 38 Figure 6 11 A5 Control Board Assembly Diagram and Test Point Locations 4509 D 0 11 5U SUCC 556 50 gt TELE C501 11 JACK 1 50 4 ms 047 SPCLR Sov SGND RT lt 20 40 VCC R502 5 0504 1 0502 pan 4 D po H re 18 DC10 3 DC10 DCS 39 p070 1 0 1 OUCLR F 09 1 2 D NE 2 pe T 4 16 _D 8 6 D 10 37 3 p2 STX Fate 5 OUCLR 36 0 2 Pre ite OUPROG F3HZ OVSCR 8 2 35 P0 3 5 ut R885 Fels BSTX 5 1 4 lt gt 13 BOUPROG 33 05 1 5 2K m FO 11 SPCLR FAN_PWM DP TST 35 P0 6 PL6L8 pc2 5861 P0 2 1 2 D RESET z0 C885 54 1608 ALE 5896 mma 16 uR P3 6 4 99 44 I RD P3
86. 574A 6674A 6575 6675A R693 Model specific 6571A 6574A 6671A 6674A 6575 6675A R694 R696 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R697 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A Agilent Part No Description ELECTRICAL PARTS 0757 0410 Resistor 301 Q 1 0 125W 0757 0413 Resistor 392 Q 1 0 125W 0757 0434 Resistor 3 65K 1 0757 0443 Resistor 11K 1 0757 0429 Resistor 1 82K 1 0757 0472 Resistor 200K 1 0698 3450 Resistor 42 2K 1 0698 3260 Resistor 464K 1 0698 8827 Resistor 1 M 1 0 125W 0757 0472 Resistor 200K 1 0757 0453 Resistor 30 1K 1 0698 1254 Resistor 536K 1 0757 0480 Resistor 432K 1 0699 1254 Resistor 536K 1 0 125W 0699 0070 Resistor 3 16 M 1 0757 0442 Resistor 10K 1 0 125W 0757 0451 Resistor 24 4K 1 0698 3450 Resistor 42 2K 1 0757 0462 Resistor 75K 1 0 125W 0698 3460 Resistor 422K 1 0698 8827 Resistor 1M 1 0 125W 0699 0070 Resistor 3 16M 1 Not used 0698 3558 Resistor 4 02K 1 0 125W 0757 0442 Resistor 10K 1 0699 0070 Resistor 3 16 M 1 0757 0468 Resistor 130K 1 0 125W 0698 4536 Resistor 340K 1 8159 0005 Resistor 0 0698 8827 Resistor 1 M 1 0 125W 8159 0005 Resistor 0 0699 0070 Resistor 3 16 M 1 Not used Replaceable Parts 105 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig R698 R699 R702 Model specific 6571A 6671A 6572A 6575A 667
87. 590 0305 Nut hex w lockwasher L901 902 brkt 0535 0031 Nut hex w lockwasher M3X 5 2 4 mm fan to bracket 0590 0305 Nut hex w lockwasher 6 32 thrd 094 in thk ground wire to rear panel 2550 0084 Nut hex bus bar 2950 0144 Nut hex rear panel gnd post B 0905 0193 O ring 1 12in input caps 5001 6746 output chassis sense term 5080 2184 Rear label 5001 6743 Rear panel 5040 1674 Safety cover dc output 5040 1676 Safety cover ac input Replaceable Parts 89 Table 5 3 Main Chassis Replaceable Parts continued Ref Desig Agilent Part No Description MECHANICAL PARTS continued 2680 0215 2940 0103 0515 1253 2940 0103 2940 0103 2680 0222 0515 0104 0515 0374 0515 0433 0380 1524 3050 0893 2190 0586 0535 0024 5001 6775 0515 0375 0515 0382 0515 0433 0515 0906 0515 1132 0515 0375 0515 0433 5001 6763 5001 0539 0380 0643 0380 1524 7144 0535 0380 1524 5062 3705 0362 0681 0362 0207 1205 0777 3050 0629 3050 1690 3050 0002 3050 0629 3050 0858 3050 0893 3050 0993 3050 1677 Screw mch 10 32 output caps Screw cap 1 4 20 power xfmr to diode block bus to heat sink Screw cap M8x1 25 30 mm lg shunt to PCB Screw cap 1 4 20 diode block to heat sink Screw cap 1 4 x 20 bus bar Screw mch 10 32 caps ac input Screw mch M3x0 5 8 mm lg sense term Screw mch M3x0 5 10 mm lg front frame Q901 to
88. 7 C760 Pe P2 0 PZ 0 V V 1806 2 1 3 1 CC lt 2 2 2 P2 3 PZ 3 CU lt gt P274 3 4 5 5 5 OUPROG E e P2 6 50 ANAC 0 2 2 7 xTAL2 x XTRL1 RST 55 RESET NOTE PSEN 80C51 C741 4509 1 AMB_SENSE INHIBIT Et RT300 LOW AFTER 10 SEC DELAY 20 509 50 DO NOT FAN DETECT R531 D530 I baes J509 1 FAN_SENSE R880 SECONDARY 0 5532 4 9 MICROPROCESSOR C752 1000PF 250VAC DO NOT LOAD pa BOUPROG ENABLE COMPARATOR _ 509 9 INRUSH RELAY CONTROL 2 530 5 J509 4 J509 11 R606 10U 150 RESET BIAS OK J509 16 lt NC RS41 1509 10 4 64K 15U DETECT 14 NOM J509 3 1509 5 1509 1 gt 287K 150 150 DETECT Uis 100 509 2 415 450 NOM _5 RIM 1 1509 6 3 1509 1 GND 505 4 1 0505 35U LT1021 z S4 FAN_PWM 509 1 FAN PWM 62 DAC REFERENCE popopoopopopouonpmg m o 15U R508 10K L 5 l S R506 6 19K 1x 7 15V R507 r 22K 1 54 4 0517 i 2 11 LM324 5U 0509 SECONDARY INTERFACE Us R516 UMON 500 24 18 C520 B 9345 1 DB11 RFB 20 20v E R517 IMONCO 24 9K DB7 DB6 C521 DBS OUT1 150 084 AGND C gt CUPROG 1 DB3 DGND 0 10U 50 R501 BERGE DB2 287K COMPARATORS Poo 15V IR ye
89. 826 1370 IC 365 U600 1820 3199 IC MC74HC4040N U601 1820 2922 IC MC74HCOON U602 1820 3081 IC MC74HC74N U603 1826 2343 IC VRGLTR SWG U604 1820 2922 IC MC74HCOON U605 1826 0065 IC 31 1 U606 1858 0083 Transistor array 14P DIP U607 1826 0962 IC 412 U608 1826 0890 IC 358A U609 1826 1343 IC voltage regulator U612 615 1826 1409 IC 1013 U617 1826 1895 Precision op amp U618 621 1826 0962 IC 412 U630 1826 1370 IC 365 VR630 1902 1377 Diode zener 6 19V VR631 1902 0018 Diode zener IN941 Y501 0410 2109 Crystal oscillator 12 000MHz MECHANICAL PARTS 0340 1277 Insulator Y501 1200 0552 Socket 40 0504 1200 0639 Socket 20 pin 17502 Replaceable Parts 109 Table 5 10 A6 output Filter Board Replaceable Parts Ref Desig Description C901 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C902 Model specific 6571A 6671A 6572A 6575A 6672A 6675A C903 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C904 Model specific 6571A 6671A 6572A 6575A 6672A 6675A C905 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C906 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C907 908 Model specific 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A C909 910 C911 912 C913 914 C930 Model specific 6571A 6671A 6572
90. A 6575A 6672A 6675A 110 Replaceable Parts Agilent Part No ELECTRICAL PARTS 0180 4333 Capacitor 22 000uF 16V 0180 4381 Capacitor 20 000uF 25V 0180 4390 Capacitor 12 000uF 45V 0180 4372 Capacitor 7 000uF 75V 0180 4466 Capacitor 2 100uF 150V 0180 4333 Capacitor 22 000uF 16V Not used 0180 4333 Capacitor 22 000uF 16V Not used 0180 4390 Capacitor 12 000pF 45V 0180 4372 Capacitor 7 000uF 75V 0180 4466 Capacitor 2 100uF 150V 0180 4333 Capacitor 22 000uF 16V 0180 4381 Capacitor 20 000uF 25V 0180 4333 Capacitor 22 000uF 16V 0180 4381 Capacitor 20 000uF 25V 0180 4390 Capacitor 12 000uF 45V 0180 4372 Capacitor 7 000uF 75V 0180 4466 Capacitor 2 100pF 150V 0180 4333 Capacitor 22 000uF 16V 0180 4381 Capacitor 20 000uF 25V 0160 4835 Capacitor 0 17uF 10 50V 0160 4834 Capacitor 0 047uF 10 0160 6804 Capacitor 0 047uF 250V 0160 4183 Capacitor 1000pF 20 0160 4048 Capacitor 0 22uF 20 0160 4413 Capacitor 0 6 10 0160 4048 Capacitor 0 22uF 20 0160 4183 Capacitor 1000pF 20 Not used 0160 4835 Capacitor 0 1uF 10 50V Table 5 10 A6 output Filter Board Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS C931 Model Specfic 6571A 6671A 0160 5468 Capacitor 0 47uF 50V 6572A 6672A 6573A 6575A 0160 6825 Capacitor 0 47uF 250V 6673A 6675A D900 Model Specific D901 Model specific 6571A 6574A 6671A 6674A 6575A 6675A D902 Model specific 6571A 6574A 6671A 6674A 6575A 6675A
91. AINO VxL99 QHvO8 13NYd 1 iv ASSY 13NYd 1NdN1 OV Figure 4 1 Agilent Series 665xA 667xA Power Supply Block Diagram Principles Of Operation 83 Replaceable Parts INTRODUCTION Chapter Organization This section lists the replaceable electrical and mechanical parts for the Agilent 657xA and Agilent 667xA Series power supplies Component location diagrams are located in Chapter 6 The lists consist of tables organized by assemblies as follows Assembly See Main chassis 1 Front Panel Board used in all models A2 Isolator Board used in Agilent 657xA models A2 GPIB Board used in Agilent 667xA models A3 FET Board used in all models A4 AC Input Board used in all models 5 Control Board model specific assembly A6 Output Filter model specific assembly A7 Snubber Board model specific assembly The locations of circuit board assemblies and chassis mounted components are shown in Figure 3 20 Table 5 3 Table 5 4 Table 5 5 Table 5 6 Table 5 7 Table 5 8 Table 5 9 Table 5 10 Table 5 11 Reading the Tables Each table lists electrical components alphabetically by reference designator and provides the Agilent part number followed by the part description Mechanical 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 Mo
92. ART STOP Figure 3 17 Signature Analysis Connections for Model 667xA Only 60 Troubleshooting Table 3 6 Front Panel SA Test Description These signatures check front panel microprocessor Valid A1U4 ROM Firmware Revision A 01 07 Test Setup See Figure 3 17 1 Turn 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 A1 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 Microprocessor SV 3395 15 0000 03 19 5520 20 954C 03 21 A552 A U3 22 2954 03 23 0 55 24 3395 A U3 25 3395 A U3 26 0000 AIU3 27 0000 03 28 40 5 A1U3 29 1029 A U3 30 0295 A U3 31 0000 A U3 32 3395 A U3 33 0008 A U3 34 040A A U3 35 0102 A U3 38 0002 39 0020 A U3 42 0000 6 After completing the tests be sure to return the J3 jumper to its original position Troubleshooting 61 Table 3 7 Secondary Interface SA Test Description These signatures check the secondary microprocessor A5U504 Valid A5U504 ROM Firmware Revision A 01 04 Test Setup See Fi
93. Before beginning troubleshooting procedures make certain the problem is in the power supply and not with an associated circuit the GPIB controller for 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 Test Equipment Required Equipment required for completing all the tests in this chapter 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 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 29 Test Equipment Required Table 3 1 Test Equipment Required Equipment Purpose Recommended Model Logic Probe To check states of data lines Agilent 545A Test Clips To gain acc
94. D910 911 Model specific 6571A 6671A 6572A 6575A 6672A 6675A F901 Model specific 6571A 6573A 6671A 6673A 6574A 6674A 6575A 6675A F902 Model specific 6571A 6571A 6672A 6672A 6573A 6673A 6574A 6674A 6575A 6675A L900 Model specific L901 902 Model specific 6571A 6572A 6671A 6672A 6573A 6673A 6574A 6674A 6575A 6675A L901A Model specific 6571A 6671A 6572A 6573A 6672A 6673A 6574A 6674A 6575A 6675A L901B Model specific 6571A 6671A 6572A 6573A 6672A 6673A 6574A 6674A 6575A 6675A 1906 0404 1901 1182 1901 1098 2110 0713 2110 0699 2110 0685 2110 0713 2110 0699 9170 0061 9170 1195 9170 0061 9170 1040 9170 1512 9170 0061 9170 1040 9170 1512 See Main Chassis Electrical Parts Not used Output rectifier Not used Output rectifier Not used Out Fuse submin 10AM 125V Fuse submin 5AM 125V Fuse submin 7AM 125V Fuse submin 10AM 125V Not used Fuse submin 5AM 125V Not used See Main Chassis Electrical Parts Not used Coil toroid Coil toroid Coil toroid Coil toroid Not used Coil toroid Coil toroid Coil toroid Not used Coil toroid Not used Replaceable Parts 111 Table 5 10 A6 output Filter Board Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS L903 903 Model specific 6571A 6671A Not used 6572A 6672A 6573A 6673A 9170 1518 Coil
95. E Resistor R893 from 10K 1 1 8W Agilent P N 0757 0442 to 7 5K 1 1 8W Agilent P N 0757 0440 Qty 1 Backdating 147 CHANGE 6 In Table 5 10 ADD 1 Capacitor C913 amp C914 1000pF Agilent P N 0160 4183 Qty 2 Pin Solder El 3 Agilent P N 1251 0600 Qty 3 2 Diode D910 amp D911 Agilent P N 1901 1098 Qty 2 3 Resistor R917 3K 5 2W Agilent P N 0698 3642 Qty 1 DELETE 1 Resistor R935 6 19K 1 1 8W Agilent P N 0757 0290 Qty 1 2 Resistor R910 3K 5 2W Agilent P N 0698 3642 Qty 1 CHANGE Resistor R937 from 1 21K 1 1 8W Agilent P N 0757 0274 to 169 Ohm 1 1 8W Agilent P N 0698 4416 Qty 1 CHANGE 7 In Table 5 9 DELETE Resistor R550 4 99K 1 1 8W Agilent P N 0698 3279 Qty 1 ADD Resistor R896 4 99K 1 1 8W Agilent P N 0698 3279 Qty 1 CHANGE 1 Zener diode VR630 from 6 2V 2 0 4 W H P P N 1902 0509 to 6 19V 2 0 4W Agilent P N 1902 1377 Qty 1 2 Resistor R861 from 267 Ohm 1 1 8W Agilent P N 0698 4446 to 499 Ohm 1 1 8W Agilent P N 0698 4123 Qty 1 ADD Capacitor C900 100pF 5 100V Agilent P N 0160 4801 Qty 1 CHANGE 8 In Table 5 4 ADD Core Magnetic Agilent P N 9170 1497 Qty REF FP Phone Cable To Chassis CHANGE Assembly PCB Keypad from Agilent P N 5060 3427 to Agilent P N 5060 3464 Qty 1 CHANGE 9 In Table 5 3 DELETE CE SHIPPING LABEL Agilent PN 5080 2247 amp CE INSTRUMENT LABEL Agilent P N 5080 2248 148 Backdating CHANGE 10 In Table 5 11 CHA
96. ENSE The readback DAC circuit is controlled by the microprocessor to successively approximate to 12 bit resolution the value of each signal monitored The CVPROG and CCPROG signals are used during self test to check operation of the DAC OP amplifier circuits The microprocessor monitors the fan speed FAN_SENSE and the supply s ambient temperature SENSE in order to generate a FAN_PWM control signal The pulse width of FAN_PWM is varied according to the ambient temperature The signal is applied to the fan speed control circuit on the A4 AC Input Board to increase the fan speed as temperature increases and decrease the fan speed as temperature decreases The Secondary Microprocessor generates OVPROG a pulse width modulated signal that represents the programmed overvoltage protection level OVPROG is processed by Programmed GAL U502 and U517 to produce OVREF which is sent to an OV Comparator circuit U630 in A5 Control Board schematic Sheet 3 This circuit compares the actual output voltage level with OVREF When the output voltage exceeds OVREF the OV comparator circuit produces a low level OVCMP signal which is applied to the Programmed GAL A5 Control Board schematic Sheet 1 When OVCMP goes true the GAL circuit produces a high level OVSCR signal that causes the following actions to occur Principles Of Operation 79 e The supply s output is downprogrammed e The pulse width modulator described later is disabled e With
97. EVELS AT A5U609 1 AND A5U608 1 WITH RESPECT TO SECONDARY COMMON SEE TABLE 6 3 50606 7 CHECK A5U608 18V CHECK A5U609 re NO CHECK 50608 AGRON R912 CHECK 50602 60901 902 Figure 3 13 Slow Downprogramming Troubleshooting 52 Troubleshooting CV CC Status Annunciators Troubleshooting When troubleshooting the CV CC status annunciators or status readback circuits first measure the voltage drop across the gating diodes which are A5D615 for the CC circuit and A5D620 for the CV circuit see A5 Control Board schematic diagram Sheet 2 A conducting diode indicates an active ON control circuit This forward drop is applied to the input of the associated status comparator A5U630 and drives the output low The low signal indicates an active status which is sent to the secondary microprocessor A5U504 via Programmed GAL A5U502 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 A5 Control Board Troubleshooting Setup Several troubleshooting procedures in this chapter require you to gain access to the components and test points on the A5 Control Board To do this follow the procedure given in Table 3 3 To gain access to components and test points on the A5 Control Board proceed as follows Turn off power supply and remove
98. Effect Tou 7MA Enter your test results in this column 26 Verification Table 2 10 Performance Test Record for Agilent Model 6574A or 6674A MODEL Agilent_ ReportNo Test Description Maximum lee RN Constant Tests Voltage Programming and Readback Low Voltage OV Vout Front Panel Display Readback High Voltage 60V Vout Front Panel Display Readback Load Effect Source Effect PARD Ripple and Noise Peak to Peak RMS Transient Response Time at 900 us Constant Current Tests Current Programming and Readback Low Current OA Iout Front Panel Display Readback High Current 35A I Front Panel Display Readback Current Sink 4A Display Readback PARD Ripple and Noise RMS Load Effect Source Effect 60mV V qut 90mV 59 916V Vou 120mV V qut 3 2mV V qut 3 2M V 25mA Tout 35mA 34 94 A Tour 70mA Lok 39mA 0 Tou 3 75mA Tout 3 75mA 60mV V qut 90m V 60 084 V Vou 120mV Vou 3 2m V Vout 3 2mV 25mA Tour 35mA 35 06A Tour 70mA Liu 39mA 25mA Tour 3 75mA Lu 3 75mA Enter your test results in this column Verification 27 Table 2 11 Performance Test Record for Agilent Model 6575A or 6675A MODEL Agilent_ ReportNo Test Description Maximum lee RN Constant Tests Voltage Programming and Readback Low Voltage OV Vout Front Panel Display Readback High Vo
99. FLT output and remote inhibit RI input Install jumper here for SA mode Install jumper here to configure DIG CNTL port for digital I O operation 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 7 and 8 NORM 3 and 4 INHIBIT CAL 1 and 2 SA Mode 5 and 6 FACTORY PRESET CAL Front Panel Test Connector A1J3 Normal operating and storage position of jumper Install jumper here for SA mode Install jumper here to disable calibration commands and prohibit calibration Install jumper here to restore original factory calibration constants TEST HEADER ON A2 GPIB BOARD TEST HEADER ON 667xA A1 FRONT PANEL BOARD J106 J3 SA MODE 1 G O 2 SA MODE gt 1 0 012 DIG VO 3 10 O14 INHIBIT CAL s 3 0 4 RELAY gt 5 O FACTORY PRESET CAL 5 O__O 6 x gt 7 8 NORM 7 8 POSITION OF JUMPER AS SHIPPED FROM THE FACTORY Figure 3 15 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
100. GING IT INTO 45 502 DISPLAY READS SECONDARY DN TURN OFF SUPPLY ANO REMOVE TOP COVER TURN ON SUPPLY AND CHECK FOR SERIAL DATA PULSES AT 20110 8 TEST POINT 5 WITH RESPECT TO PRIMARY GROUND 1 SEE TABLE 6 31 CHECK A2110 919 CHECK FOR 5V AT A2UTIO 8 WITH RESPECT TO SECONDARY COMMON TEST POINT SEE TABLE 6 3 CHECK CABLE W4 SEE FIG 6 41 CHECK SECONDARY BIAS CIRCUIT TEST POINTS 2 ANO 18 SEE TABLE 6 2 SV A2UTO 8 SUPPLY OPERATES OK7 CHECK FOR SERIAL DATA PULSES AT THE AS CONTROL BOARD YES CIRCUIT POINTS AS INDICATED BELOW WITH RESPECT TO SECONDARY COMMON 12 CHECK A2UTIO AND FOR CABLE W4 OPEN TROUBLE SHOOT A2 ISOLATOR BOARD ANO W4 TO SHEET 2 Figure 3 12 Secondary Interface Down Sheet 1 of 2 50 Troubleshooting FROM SHEET 1 CHECK SPCLA SIGNAL AT A4U806 6 TEST POINT 69 TABLE 6 3 AND FOR CLOCK SIGNAL AT A5US04 18 CHECK 4806 CHECK A5C502 C508 5 CHECK FOR SERIAL DATA PULSES AT THE A2 GPIB BOARD AT A2UITI 6 TEST POINT WITH RESPECT TO PRIMARY GROUND 1 SEE TABLE 6 8 CHECK AZU CABLE W4 CHECK 2 19 Figure 3 12 Secondary Interface Down Sheet 2 of 2 Troubleshooting 51 START SLOW DOWN PROGRAMMING TURN OFF SUPPLY REMOVE TOP COVER AND RFI SHIELD PERFORM AS CONTROL BOARD TROUBLESHOOTING SETUP TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO 1 2 FULL SCALE CHECK VOLTAGE L
101. GPIB PRX Primary receive serial data DFI Discrete fault indicator PTX Primary transmit serial data DFI EN Discrete fault indicator enable PWM_EN Pulse width modulator enable DPS Downprogramming shunt RAM Random access memory DN_PGM Down programming RDY Ready DRIVE_A B FET drive signals REN Remote enable EOI End or identify GPIB RI Remote inhibit FAC CAL Factory calibration ROM Read only memory FAN PWM Fan pulse width modulation SPCLR Secondary power clear FPRX Front panel receive serial data RX Receive serial data FPTX Front panel transmit serial data RxD Receive serial data FS Fast sense SA Signature analysis HSRQ GPIB service request SRQ Service request GPIB IFC Interface clear GPIB SRX Secondary receive serial data IMON Current monitor STX Secondary transmit serial data INH_CAL Inhibit calibration TxD Transmit serial data IP External current programming UART Universal asynchronous Receive transmit IPROG Current programming VMON Voltage monitor ISEN Current sense vos Voltage offset ISRQ Interface service request VPROG Voltage programming KO 0 KO 5 Keypad output data bus WR Write 0 5 Keypad input data bus 118 Diagrams Table 6 3 Troubleshooting Test Points TEST POINT Signal Tested Measurement and Conditions No amp Loc A2 GPIB BOARD 667xA Series Only J106 4 Primary chassis ground Connect meter or scope common here Then make measurements
102. IVE CIRCUIT SEE A3 BOARD SCHEMATIC IN CHAPTER 6 TURN OFF SUPPLY AND PERFORM AS CONTROL BOARD TROUBLE SHOOTING SETUP TABLE 3 3 TURN ON SUPPLY AND PROGRAM THE OUTPUT OF 1 2 FULL SCALE VOLTAGE AND CURRENT PROGRAM OV TO MAXIMUM OCP OFF AND OUTPUT ENABLED I CC ANNUNCIATOR ON NO YES GO TO SHEET 2 1 UNR NO CHECK CV PROGRAMMING LEVEL ANNUNCIATOR AT ASUS08 6 ON YES USE A DIFFERENTIAL INPUT OSCILLOSCOPE TO CHECK FOR THE PRESENCE OF PULSES AT A5J508 ASU600 10 56 ASU602 9 5 607 1 50604 8 AND 50606 7 SEE CORRECT WAVEFORMS IN TABLES 6 3 AND FIGURE 6 1 CHECK VOLTAGE CAUBRATION SEE APPENDIX A IN OPERATING MANUAL 15V 40KHz d YES SEE BOARD TROUBLE is TP D SHOOTING TABLE 3 4 NO SV 2MHz IS TP 82 TP YES 5V 40KHz ph YES NO CHECK 50504 U518 CHECK A5U606 U607 IS 3 NO TV 40KHz YES GO TO SHEET 2 CHECK ASU600 9601 U602 CHECK ASU6IS Figure 3 5 Output Held Low Troubleshooting Sheet 1 of 2 Troubleshooting 41 FROM SHEET 1 o NS YES CHECK VOLTAGE LEVEL 7 AT ASU608 3 60 NO CHECK VOLTAGE LEVEL 50621 1 49 CHECK 50518 0504 CHECK 50608 CHECK 50621 CHECK A5U605 YES CHECK 50605 FROM SHEET 1 CHECK CURRENT READING ON FRONT PANEL DISPLAY DISPLA READS 1 2 5 CURRENT2 NO HECK CC PROGRAM LEVEL A
103. J900 11 OUT f 1 HO12 WO16 DPS C910 912 5 L fYYYY2 e el m V jaag 3 gt 3J900 E1 E2 amp C908 a 5 6 022 k k S ON SHIELDS ARE 022 250V 250VAC NOT USED ON 250 Olt WO15 F901 F902 ISEN 3J900 5 ISEN 8U UNIT SNUBBER BD umm 1 5A 5A T1 17 E US G gt 915 J900 7 1000PF GND 14 30 s GO J900 16 TT x eeu 4900 17 2 10 nage 24 3K 5 D910 D911 1N4150 154150 ETT V 0901 gt 0902 gt 0903 2 DPS 3900 1 H z 80901 H 5 180901 ga pos PROGRAMMER SHUNT R937 R916 t QU NE R934 NOT T d H LOADED 169 Q910 464 IRFIP240 5 464 IRFIP240 5 lt 464 IRFIP240 5 4 LM358 4 LM358 NOT J900 3 DOWN PROGRAMMER CONTROL RO10 LOADED C930 4 4 4 J900 20 47K 5X DAR XuR902 1 lt R915 FAST SENSE 1042 ZA 120 3 01K J900 19 LOADED 14 3V lt e ___5 J900 13 e e e e e gt 900 14 gt 900 15 4 18A XFMR LUG G A7 Snubber Board 6931 a 29900719 6675A only A7 Snubber Board 6673A 74A e h 215 gt e 5900 D 6675A only 42 900 8 SNUBBER BD 2500 R994 R990 R992 x1 _ 990 188 188 34900 9 56 56 56 p 5x 5x 5 PRO ORE E M1 1 J300 10 680 To CHEM L R991 FET BD HEATSINK M4 PL JBeUT lt RECTIFIER M2 4 M 5 1 4 CATHODE 2 R993
104. L Serial buffer failure EE WRITE ERR SECONDARY DN EEPROM write failure Serial data line failure on Main board A double asterisk indicates that the item applies only to 667xA system supplies Troubleshooting 31 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 Chart Trouble or Circuit Figure 3 1 Overall procedure checks selftest errors calibration errors ac input circuit fan readback circuits A5 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 interface circuit from Figure 3 1 Figure 3 11 Isolator bo
105. MO Resistor 43 Q 5 2W MO Resistor 56 Q 5 2W MO Not used Resistor 43 Q 5 2W MO Resistor 56 Q 5 2W MO Not used Resistor 680 Q 5 2W MO Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining Series 657xA and 667xA 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 Table 6 1 Summary of Chapter Contents Function Description See Interconnections Drawing identifying each circuit board the cables between boards and schematic Figure 6 2 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 Used in 667xA Series only A2 Isolator Board Used in 657xA Series only A3 FET Board A4 Input AC Power Board A5 Control Board 3 sheets Secondary Interface and CV CC Readback DACS CV CC Control Circuits Switching Down Programmer Control OV Monitor Agilent 6571A 72A 6671A 72A A6 Output Filter Board amp A7 Snubber Board Agilent 6573A 74A 6673A 74A A6 Output Filter Board amp A7 Snubber Board Agilent 6575A and 6675A A6 Output Filter Board amp A7 Snubber Board
106. Maximum Voltage Programming and Readback Low Voltage OV Vout Front Panel Display Readback High Voltage 8V Vou Front Panel Display Readback Load Effect Source Effect PARD Ripple and Noise Peak to Peak RMS Transient Response Time at 900 us Constant Current Tests Current Programming and Readback Low Current Iout Front Panel Display Readback High Current 220A I Front Panel Display Readback Current Sink 10A Display Readback PARD Ripple and Noise RMS Load Effect Source Effect Constant Tests 8mV Vou 12mV 7 9888V Vout 16mV Vou 0 46mV V qut 0 46mV 125mA Tour 150mA 219 655A Tout 370mA Link 160mA 0 8mV V qut 12mV 8 0112V Vou 16mV V out 0 46mV V out 0 46mV 125mA Tout 150mA 220 345A Tout 370mA Lia 160mA 200mA Tour 21mA La 21mA Enter your test results in this column 24 Verification Table 2 8 Performance Test Record for Agilent Model 6572A or 6672A MODEL Agilent_ ReportNo Test Description Maximum lee RN Voltage Programming and Readback Low Voltage OV Vout Front Panel Display Readback High Voltage 20V Vout Front Panel Display Readback Load Effect Source Effect PARD Ripple and Noise Peak to Peak RMS Transient Response Time at 900 us Constant Tests 20mV Vou 30mV 19 972V Vou 40mV Vout 1 05mV Vout 1 05mV 20mV Vou 30mV
107. N ACCESS TO CIRCUITS ON FRONT PANEL BOARD A1 TURN ON SUPPLY AND CHECK FOR PULSES A3A1U3 17 18 SEE FIG 3 15 CHECK CABLE W5 YES PULSES AT A3A1 3 18 CHECK ASUU SUPPLY OPERATES PROPERLY TURN OFF SUPPLY AND RETURN CABLES W4 AND 5 TO THEIR ORIGINAL POSITIONS GO TO TROUBLE SHOOTING ISOLATOR BOARO SYSTEM POWER SUPPLY TURN SUPPLY ON AND CHECK PCLR SIGNAL AT A2U101 8 TEST POINT SEE TABLE 6 3 ON THE GPIB 8OARD ALSO CHECK 12MHz SIGNAL AT 20114 6 NO Y CHECK A2U101 CHECK A2C107 C108 Y101 CHECK FOR ANY ACTIVITY PULSES ON OATA ANO ADDRESS LINES TO INDICATE THAT PRIMARY MICROPROCESSOR A2U114 IS OPERATING CHECK A2UTM Ult 1106 U108 U120 USE OHMMETER TO CHECK FOR UNES SHORTED TO 5v OR COMMON IF NO SHORTED LINES ARE FOUND REPLACE 2 44 SEE NOTE 2 NOTES 1 IF SECONDARY ON APPEARS ON THE DISPLAY FIRST AND THEN SERIAL DOWN IS DISPLAYED GO TO FIGURE 3 15 2 1 THIS DOES NOT FIX THE PROBLEM REPLACING THE A2 GPIB BOARD MAY BE THE MOST COST GO TO SHEET 2 CHECK FOR THE PRESENCE OF CLOCK PULSES AT THE FOLLOWING CIRCUT POINTS ON THE A2 GPIB BOARD EFFECTIVE SOLUTION SYSTEMS POWER SUPPUES ONLY Figure 3 10 Serial Down Troubleshooting Sheet 1 of 2 Troubleshooting 47 FROM SHEET 1 CLK PULSES AT A2U119 17 NO CHECK A2U114 U119 YES 1MHz CLK PUL
108. N ON SUPPLY AND CHECK BIAS AND REFERENCE VOLTAGES TEST POINTS THROUGH 9 SEE TABLE 6 3 TROUBLESHOOT THE DEFECTIVE CIRCUIT SEE FIGURE 6 5 TURN OFF SUPPLY AND PERFORM A5 CONTROL BOARD TROUBLESHOOTING SET UP SEE TABLE 3 3 TURN SUPPLY ON AND PROGRAM THE OUTPUT VOLTAGE AND CURRENT TO 1 2 SCALE PROGRAM THE OV TO ZERO INSURE THAT OUTPUT VOLTAGE IS AS PROGRAMMED AND THE OVER VOLTAGE CONDITION IS NOT DETECTEDIOV ANNUNCIATOR IS OFF CHECK VOLTAGES AT A5U630 10 AND A5U630 15 63 WITH RESPECT TO COMMON G SEE TABLE 6 3 A5U630 10 NEGATIVE 50517 14 OV CHECK A5U517 0502 0604 CHECK A5C660 R691 R693 8696 R697 0680 CHECK 50630 A5U630 15 LOW FIG3 3 GAL CHECK 50502 Figure 3 3 OV Will Not Fire Troubleshooting 38 Troubleshooting START AT TURN ON WARNING DURING THESE TESTS THE OUTPUT MAY BE AT HAZARDOUS LEVELS CHECK THAT SUPPLY I NOT PROGRAMMED TO CAUSE AN OV AT TURN ON ENSURE THAT THE VOLTAGE SETTING 5 NOT GREATER THAN THE OV SETTING MEMORY REGISTER BY PROGRAMMING 0 VOLTS AND MAXIMUM OV THEN SAVE IN REGISTER O PRESS THE SHIFT SAVE 0 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 GOES HIGHER GO TO OUTPUT HELD HIGH TROUBLE SHOOTING FIG
109. NGE Capacitor C990 C991 from 0 015uF 10 200V Polyester Foil Agilent P N 0160 0194 to 0 015 5 400V Polypropylene Foil Agilent P N 0160 6896 Qty 2 CHANGE 11 Applicable to Agilent Maintenance Personnel Only REFERENCE PCO 21 6348 amp 21 6397 This PCO is in reference to 21 6348 amp 21 6397 The start serial number for Model Q572A should be as follows MODEL RUN START SERIAL 6572A 57602 3216 00108 CHANGE 12 In Table 5 6 CHANGE 1 Capacitor C138 from 0 047uF 20 50V Agilent P N 0160 5422 to 0 01uF 10 100V Agilent P N 0160 4832 Qty 1 2 Resistor R134 from 100 Ohm 596 1 AW Agilent P N 0683 1015 to 1K 596 1 AW Agilent P N 0683 1025 Qty 1 CHANGE 13 In Table 5 6 The power supply unit will not operate with Agilent relay boxes 59510A and 59511A in the relay link communications mode The cover must be removed and the jumper on the GPIB assembly 50603291 must be moved as described in the operating manual to observe this operating anomaly CHANGE 14 In Table 5 9 ADD Label Agilent P N 5080 2249 Qty 1 Change to ETL label CHANGE 15 In Table 5 9 ADD Capacitor C900 100pF 5 100V Agilent P N 0160 4801 Qty 1 CHANGE 16 In Table 5 3 CHANGE 1 PC Board Output Snubber from Agilent PN 5020 2745 to Agilent P N 5020 2774 Qty 1 2 Output from Agilent P N 5020 2744 to Agilent P N 5020 2775 Qty 1 Backdating 149 CHANGE 17 In Table 5 11 CHANGE Capacitor C990 amp C991 from 0 022UF 10 20
110. O 13 14 gt gt 61 a2 40 zy Hoco 15 16 1000 1600 RD ADC 017 sss 9 HSOS T3 HS04 T2 ac0 14 HS02 HSO1 C14 5Ve 047 1 8 ES 50 s42 1 9 1 08 oc 11 1 C V AD 7 2 4p 619 ance 3 sp 2048 ace 1 vee 8 ADCS 4 5 3927 acs 3105 S p 496 4 eae 6 lay 5015 acs ET R25 DI ap C10 Z le 60 14 ace 222 T5098 NMC9346 AD 8 7p 27a ADCO 9 Jan galaan 1 1 ALS573 5 J3 7 23K0 4 424 TELE le 1 le2Koc3 KIO KICA KICS 4 j oco 1 z047 6 2 WS 5 POS 1 KEY PLANE 50 V TP2 W6 D1 50 W8 RPG SHIELD 1 En 3 TAB OF 4200 C13 R39 E BOARD 7047 4 64K va 5 F6 5 V RPG SHIELD 1 All resistor values are in OHMS 1 1 8W unless otherwise specified 2 All capacitor values are in microfarads unless otherwise specified Figure 6 4 A1 Front Panel Board Schematic Diagram
111. SERVICE MANUAL GPIB DC Power Supplies Series 657xA and 667xA For instruments with Serial Numbers Agilent Model 6571A US36520101 and Above Agilent Model 6572A US36350101 and Above Agilent Model 6573A US36330101 and Above Agilent Model 6574A US36340101 and Above Agilent Model 6575A US36340101 and Above Agilent Model 6671 A US36400101 and Above Agilent Model 6672A US36390101 and Above Agilent Model 6673A US36380101 and Above Agilent Model 6674A US36370101 and Above Agilent Model 6675A US36370101 and Above For instruments with higher serial numbers a change page may be included For instruments with lower serial numbers see Appendix A Agilent Technologies Agilent Part No 5961 2583 Printed in USA Microfiche Part No 5961 2584 September 2000 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
112. SES AT A2U119 12 NO CHECK A2U112 U117 UNO CHECK FOR PRESENCE OF PULSES AT THE FOLLOWING CIRCUIT POINTS ON THE A2 GPIB BOARD SEE FIG 6 8 YES UART PULSES AT A2U100 167 Ne CHECK A2U120 Utt YES PTX PULSES AT NO CHECK A2U 12 U119 U A2U112 6 YES PULSES A2U119 18 CHECK A2U119 PRX PULSES AT A2U112 2 CHECK A1U119 CHECK A2U112 Figure 3 10 Serial Down Troubleshooting Sheet 2 of 2 48 Troubleshooting CHECK 5V BIAS CIRCUIT ON MAIN 6 T BOARD OR OPEN CABLE 5V 8 804 TO PRIMARY F800 0805 5V LOADED 11VAC COM C803 SPCLR e J800 2 TO SEC HECK SPCLR CIRCUIT ON MAIN BOARG COM J800 1 OR OPEN CABLE RESET HIGH J801 2 TO CHECK UBOO U804 FRONT PANEL PRI COM C803 LOADING SIGNAL PULSES 9 BSTX J800 3 TO SECONDARY uP CIRCUIT ON MAIN SEC COM J800 1 BOARD OR OPEN CABLE U802 U804 FRONT PANEL CIRCUITS RxD 1 3 TO PRI LOADING SIGNAL PULSES FRONT PANEL uP CIRCUITS OPEN TxD7 i TO PRI CABLE OR 804 LOADING SIGNAL PULSES Rx 7 J800 4 TO SEC U801 0804 OR SECONDARY COM J800 1 CIRCUIT LOADING SIGNAL ISOLATOR BD APPEARS OK CHECK CABLES Figure 3 11 Isolator Board Troubleshooting Troubleshooting 49 START SECONDARY DOWN DISPLAY READS SECONDARY DN TURN OFF SUPPLY AND REMOVI TOP COVER AND INNER SHIELD BYPASS ISOLATOR BD BY UNPLUGGING CABLE FROM A2J801 AND PLUG
113. SIP 0757 0123 Resistor 34 8K 1 0698 6983 Resistor 20 4K 0 1 0699 1212 Resistor 19K 0 1 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig Description R505 Model specific 6571A 6671A 6572A 6574A 6672A 6674A 6575A 6675A R506 R507 R508 R509 511 R512 R513 514 R515 R516 517 R520 R521 R530 R531 R532 R533 534 R535 R540 R541 R542 R543 R544 R601 R603 R604 R605 606 R608 R609 R610 R611 R633 634 R635 636 R637 Agilent Part No ELECTRICAL PARTS 0698 7163 Resistor 2 0081K 0 196 0698 6631 Resistor 2 5K 0 1 0698 6348 Resistor 3K 0 1 0 125W 0699 1212 Resistor 19K 0 1 0698 6392 Resistor 22K 0 1 0 125W 0757 0442 Resistor 10K 1 0 125W 0757 0401 Resistor 100 Q 1 0 125W 0698 3456 Resistor 287K 1 0757 0465 Resistor 100K 1 0757 0462 Resistor 75K 1 0 125W 0698 4486 Resistor 24 9K 1 0757 0442 Resistor 10K 1 0 125W 8159 0005 Resistor 0 0757 0442 Resistor 10 1 0 125W 0757 0280 Resistor 1K 1 0 125W 0698 8827 Resistor 1M 1 0 125W 0698 3162 Resistor 46 4K 1 0757 0280 Resistor 1K 1 0 125W 0757 0273 Resistor 3 01K 1 0698 3155 Resistor 4 64K 1 0757 0442 Resistor 10K 1 0 125W 0757 0289 Resistor 13 3K 1 0757 0472 Resistor 200K 1 0757 0273 Resistor 3 01K 1 0757 0442 Resistor 10K 1 0 125W 0757 0199 Resistor 21 5K 1 0757 0442 Resistor 10K 1 0 125W 0757 0273 Resistor 3 01K 1 0757 0407 Resistor 200 Q 1 0 125W 0757 0273 Resistor
114. T A5U510 6 40 YES CHECK FOR SHORT CIRCUI IN OUTPUT CHECK CURRENT CALIBRATION CHECK VOLTAGE LEVELS AT A5U612 1 AND A5U680 8 Y 47 HIGH CHECK 50502 NO NO CHECK 50612 CHECK 50680 Figure 3 5 Output Held Low Troubleshooting Sheet 2 of 2 42 Troubleshooting 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 THROUGH 5 SEE TABLE 6 3 ARE NO TROUBLESHOOT THE DEFECTIVE CIRCUIT VOLTAGES SEE FIG 6 5 OK YES TURN GFF SUPPLY AND PERFORM AS CONTROL BOARD TROUBLESHOOTING SETUP TABLE 3 3 DISABLE THE OV CIRCUIT BY LIFTING ASR 91 TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO ZERO CHECK IF CV OR GATE DIODE 50620 15 CONDUCTING NO CHECK VOLTAGE READING ON FRONT PANEL DISPLAY NO ASD620 CONOUCTING YES CHECK VOLTAGE LEVEL AT FAST SENSE OISPLAY READS FIULL SCALE DIFF AMP 5621 1 65 VOLTAGE YES CHECK CV ERROR AMP CIRCUIT 50615 CHECK A5U621 CHECK VOLT DIFF AMP CIRCUIT ASUG 5 CHECK A5U605 Figure 3 6 Output Held High Troubleshooting Troubleshooting 43 START DAC DEFECTIVE ONE OF THE CIRCUITS IS DEFECTIVE TURN OFF SUPPLY ANO REMOVE TOP COVER TURN ON SUPPLY AND CHECK BIAS AND REFERENCE VOLTAGES TEST ONIS S THOUGH TABLE 6 39
115. ached see Disassembly Procedures 2 Measure the resistance between the Rail E502 and the Rail E501 gt 20 MQ 3 Measure the resistance between the gate of each FET Q201 204 Q211 Q222 Q233 gt 15 kQ and Q244 and common Rail Troubleshooting 53 Table 3 4 FET Troubleshooting Chart continued Procedure Result Static Troubleshooting 4 Measure the resistance across capacitor C201 150 5 Measure the resistance across the 15V bias input E506 to E507 kQ in the forward direction and 490 Q in the reverse direction Dynamic Troubleshooting 1 Turn off the power supply and remove FET Board with its heat sink assembly See Disassembly Procedures 2 Short the collectors of Q251 and Q252 by connecting the collector case of each transistor to common E507 3 Connect waveform generator to J200 1 and J200 2 4 Set generator to produce a 20KHz 20V p p triangular waveform See Figure 3 14A 5 Connect 15V from an external supply to E506 positive and E507 common Note All of the following measurements are taken with respect to E507 common test point 26 on A3 FET Board schematic diagram 6 Check bias voltage at U203 1 27 45V 7 While adjusting the external 15V supply input check the bias trip point at U204 1 4 Voltage goes from low OV to high 5V at an input of approximately 12V and from high to low
116. ail Q202 Q222 FETS causing current to flow through T900 in the opposite direction The FET on off periods are controlled by Duty Cycle Detect and the peak current detection circuits If the output attempts to change regulation is accomplished by the CV CC Control Circuits on the A5 Control Board previously described These circuits vary the width of the drive pulses and the duration of the FET on off periods Output Circuits The output circuits consist of chassis mounted components power transformer T900 power rectifier D900 and inductor L900 the A6 Output Filter Board and the A7 Snubber Circuit Board These circuits are shown on the corresponding model schematic see Chapter 6 Power transformer T900 couples the output pulses from the A3 FET Board to the power full wave rectifier D900 Filtering is provided by L900 and the A7 Snubber Board The A6 Output Board provides both normal mode and common mode filtering as well as downprogramming circuits When activated the downprogramming circuits draw current from the output terminals 82 Principles Of Operation 35 35 15 WOUINOD 490 NISI FINO F 133H9 7IOUINOO 133HS SMUD TOULNOD 9 H31dVH2 NI 2I1YW3H2S Fev ddv 335 w O 133889 32V 3 AUvQNO23S GUVOB SV 0060 ASSY SH ONY GtiVO8 133 38 SLINDYID HOSS 3D0HdOHIIN AYYNIHd Quvoa YOLY1OSI 3 91899 GHYOS 8450 viva 14835
117. al off CLEAR SCREEN PRINT Transferring calibration data to factory preset locations Fact cal sour Address of factory calibration data source DATA 2 6 68 72 20 24 76 80 150 Fact cal dest l Address of factory calibration data destination DATA 84 88 92 96 100 104 108 112 116 Fact cal len Length of factory calibration data DATA 4 4 4 4 4 4 4 4 2 RESTORE Fact cal sour FOR I 1 TO 9 READ Cal sour addr T NEXT I RESTORE Fact cal dest FOR I 1 TO 9 READ Cal dest NEXTI RESTORE Fact len FOR I 1 TO 9 READ Cal length I NEXT I FOR I 1 TO 9 Locations of good data OUTPUT Ps DIAG EEPR sour addr D Cal length I Read good data ENTER Ps Cal_data Enter good data OUTPUT QGPs DIAG EEPR Cal dest addr D Cal length 1 Cal data Write good data to factory preset locations 2070 2080 2090 NEXTI 2100 Cal off 2110 2120 2130 2140 CLEAR SCREEN OUTPUT Ps CaL STATE OFF Turn off cal mode GOSUB Ps error Check for errors Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 5 of 6 68 Troubleshooting 2150 IF Err THEN 2160 PRINT An error occurred during the EEPROM read write Check for 2170 PRINT programming errors Initialization data may be incorrect 2180 STOP 2190 ENDIF 2200 2210 PRINT Operation complete Program stopped 2220 STOP 2230
118. ams 123 2 00 v div 5 00 v 5 00 us div 25 00 2 00 v div 0 00 v 5 00 ua div 9 000 us 2 00 V etv 0 00 Y tt l F Td Tl EXSET TT 1 00 ua div 5 000 TEST POINT TEST POINT 64 2 00 Y div 5 00 v TEST POINT 5 00 us div 25 00 us 5 00 us div 9 000 us 2 00 V siv 0 00 v 5 00 us div 25 00 u F r k grum TEST POINT 63 TEST POINT TEST POINT s9 d 6 3 00 Y 3 00 us div 25 00 ws 2 00 Y div 9 00 Y 208 15 00 us 4 00 V div 8 00 V 10 0 us div 50 99 us TEST POUT TEST POINT 2 00 V aiv 0 00 Y TEST POINT 62 50 0 ev div 0 00 Y 5 00 us div 9 000 96 0 nu qiv 250 0 ne TEST POINT TEST PoINT 67 Figure 6 1 Test Point Waveforms for Table 6 3 124 Diagrams A7 SNUBBER BOARD 4 Fu UNE FALTER A4 AC INPUT BOARD FET BOARD ISEE FIG 6 7 E E4t6 Et e OR 6 8 AC E4120 o 415 1 INPUT 30 CHASSIS MOUNTED J CH COMPONENTS SEE OUTPUT XFMR T900 FIG 6 4 44 RECTIFIERS 0900 Jm li ANDCHOKELSQ0 SEE FIG 66 7 OR 6 8 J500 o EAT o 418 419 AS CONTROL A6 OUTPUT 414 BOARD FILTER BOARD FRONT PANEL ASSY _ wl we gt gt gt 2 gt gt gt I t 9 i ISEE FIG 6 7 OUTPUT I TEMINALS 01 4 1 FIG 6 4 T i I EXTERNAL CONNECTOR w4 A2 ISOLATOR BOARD 4 w4 GPIB 657xA SERIES SERIAL UNK SEE APPUCABLE SCHEMATIC IN THIS CHAPTER Figure 6
119. and U513 The secondary microprocessor translates the serial data received from the A2 board into a parallel 12 bit data bus The data bus is connected directly to the three DAC OP amplifier circuits Under control of the microprocessor the selected DAC converts the data on the bus into an analog signal The DAC reference circuit U505 U517 provides a 10V reference for the CV and CC DACs and a 11 6V reference for the readback DAC A CV DAC OP amplifier U507 U508 converts the programmed value of voltage on the bus into the CVPROG signal CVPROG is sent to the CV control circuits to control the magnitude of the output voltage in the CV mode The range of CVPROG is 0 to 10V which corresponds to the zero to full scale output voltage range of the power supply A CC DAC OP amplifier U509 U510 converts the programmed value of current on the bus into the CCPROG signal CCPROG is sent to the CC control circuits to control the magnitude of the output current in the CC mode The range of CCPROG is 0 to 10V which corresponds to the zero to full scale output current range of the supply The Readback Comparator circuits U503 U513 operate with the readback DAC OP Amplifier U511 U512 to return the following signals to the microprocessor 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 speed FAN_S
120. ard circuits Figure 3 12 Secondary interface down from Figure 3 1 Figure 3 13 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 32 Troubleshooting START OVERALL TROUBLE SHOOTING TURN OFF SUPPLY AND REMOVE THE TOP COVER AND RFI SHIELD DISCONNECT LOAD AND CONNECT SENSE TERMINALS FOR LOCAL SENSING TURN ON SUPPLY AND CHECK FOR ANY INDICATION FAN RUNNING DISPLAY ON INPUT RAIL LED A4CR402 THAT AC POWER IS ON IS AC POWER CHECK FUSE A4F400 INPUT LINE FILTER FL1 OR LINE ON SWITCH 151 YES CHECK FUSE A4308 XFMR 4 300 LINE VOLTAGE SELECT SWITCH SW 300 ANO DIODES 0306 310 D317 GO TO NO DISPLAY TROUBLE SHOOTING SEE FIG 3 2 CHECK FAN 4964 R369 R370 ERROR MESSAGE SE LF TEST ERROR MESSAGES TABI lt DISPLAYED E SE ESTE CODES MES LE 3 2 NO USING FRONT PANEL KEYS PROGRAM FULL SCALE VOLTAGE AND CURRENT SEE TABLE 2 2
121. at an input of approximately 13V 8 Set external supply input to 15V and check drive 1 waveform at U201 10 and See Figure 3 14B drive 2 waveform at U201 12 9 Check that pulses are present at U201 1 U201 7 U202 1 and U202 7 See Figure 3 14C 10 Pulses should be present on both sides of inductors L201 204 and L213 216 as follows Check the pulses on the driver transistor side 0251 0254 of each inductor See Figure 3 14D Check the pulses on the FET regulator side Q201 Q204 Q211 Q222 Q233 and Q244 of each inductor See Figure 3 14E 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 0204 4 17 12 Check the peak current limit by connecting a 68KQ resistor from 5V U201 9 to All pulses turn off U204 5 54 Troubleshooting i SET EB m N IZIN 5V DIV 10 Us DIV A J200 TEST SIGNAL FROM SIGNAL GENERATOR 5V DIV 10 uS DIV U201 U202 PINS 1 7 DRIVE SIGNAL 5V DIV 10 yS DIV L201 L203 L213 L216 REGULATOR SIDE 5V DIV 10 uS DIV B U201 U202 PINS 10 12 DRIVE SIGNAL DIV 10 uS DIV D 201 1204 213 216 DRIVE SIDE Figure 3 14 A3 FET Board Test Waveforms Troubleshooting 55 Signature Analysis Introduction The easiest and most efficient method of troubleshooting microprocessor based instr
122. ative laminate or with a conductive table mat Agilent P N 9300 0797 or equivalent Using a conductive wrist strap such as Agilent P N 9300 0969 or 9300 0970 Grounding all metal equipment at the station to a single common ground Connecting low impedance test equipment to static sensitive components only when those components have power applied to them 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 667xA GPIB system and 657xA programmable bench 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 for system units Tests Two types of procedures are provided Operation Verification tests and Performance tests Type of Test Purpose Operation Verification 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 re
123. bleshooting and repairing to the component level the following 2 kilowatt power supplies Agilent Series 657xA manually programmable bench and e Agilent Series 667xA GPIB programmable system 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 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 e Options accessories specifications supplementary characteristics output characteristic curve typical output impedance curve
124. can apply to your supply You may also be instructed to update your power supply if certain components are being replaced during repair For all Agilent Models make changes 26 through 34 and change 36 Note Serial Numbers _ Change Model 6571A 3206A 00103 8 9 3222A 00118 7 3222A 00123 14 All 17 19 22 37 3635A 00143 _ 39 40 Model 6572A 3203A 00103 8 3203A 00108 7 9 10 11 3216A 00123 14 3422A 00138 37 3626A 00218 39 3635A 00223 _40 Model 6573A 3204A 00103 8 9 3223A 00113 7 3223 00133 14 3432 00143 37 3620 00208 38 3633 00220 _39 40 Model 6574A 3208A 00103 6 8 9 3230 00113 7 14 22 3423 00183 37 3423 00258 38 3620 00303 39 3634 00323 _40 Serial Numbers _ Change Model 6575A 3209A 00103 8 9 3220A 00108 6 3242A 00118 14 3423A 00163 37 3423A 00208 38 3622A 00238 39 3634A 00268 40 Model 6671 3125 00168 1 3129 00183 13 3145 00233 2 3 4 3203 00273 9 3215 00323 7 3236 00388 12 3236 00428 14 35 17 19 20 21 22 23 24 25 36 3624A 00578 39 3639A 00601 _40 Model 6672A 3138A 00101 13 3149A 00120 9 3217A 00131 7 10 3235A 00151 12 3235A 00201 14 3347A 00256 35 All 19 22 36 3621 00561 39 3632 00603 _40 Backdating 145 Serial Numbers Change Model 6673A Serial Numbers _ Change Model 6674A cont 3138A 00101 13 3151A 00
125. ck 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 Turn off the power supply and connect a DVM across LS and LS see Figure 2 1A Turn on the power supply with no load and program the output for 0 volts and maximum programmable current see Table 2 2 Record voltage readings at DVM and on front panel display Program voltage to full scale see Table 2 2 Record voltage readings of DVM and on front panel display CV Load Effect CV annunciator on Output current near 0 Readings within specified Low Voltage limits Readings within specified High Voltage limits 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 LS and LS see Figure 2 1A 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 the front panel display Record voltage reading of the DVM Adjust load to draw 0 amperes open load Record voltage reading of the DVM Check test result CV annunciator is on If it is not adjust the load to slightly reduce the output current until the annunciato
126. de 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 LS and LS see Figure 2 1A 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 Figure 2 2 waveform Measure both the loading and unloading transients by triggering the Specified 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 interval UNLOADING TRANSIENT 100 mV or 0 196 lt see Table 2 2 NOMINAL VOLTAGE 100 mV or 0 1 see Table 2 2 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 Figure 2 1B The accuracy of the resistor must be as specified in the table Test Procedures The test procedures are given in Table 2 5 Th
127. del 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 SP display LCD fuse goon Q gt AQ VTA jack relay inductor plug transistor resistor thermal resistor switch transformer terminal block integrated circuit voltage regulator cable or jumper crystal oscillator Replaceable Parts 85 Table 5 2 Part Description Abbreviations assy assembly M metric sq square w o without bd board mch machine submin subminiature xfmr transformer blvl belleville mm millimeter thk thick xtal crystal gnd ground mtg mounting thrd thread lg long PCB pc board w with How Order Parts You can order parts from your local Agilent Technologies 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 86 Replaceable Parts Table 5 3 Main Chassis Replaceable Parts Ref Desig Agilent Part No Description ELECTRICAL PARTS 6571A 6671A 6572A 6672A 6573A
128. ds 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 used and the environmental conditions Tables 2 7 through 2 11 are dedicated to specific models and contain the acceptable test values and ranges A place is provided to record the results of the test Verification 13 OC POWER SUPPLY O NOTE 2 ELECTRONIC LOAD TO RMS VOLTMETER OR OSCILLOSCOPE TO DC OR RMS CURRENT MONITOR VOLTMETER RESISTOR NOTE 1 OR OSCILLOSCOPE TO RMS VOLTMETER NOTES f SEE TABLE 2 1 2 REQUIRED FOR CURRENT SINK TEST FIG2 01 GAL A CV Test Setup B CC Test Setup Figure 2 1 Constant Voltage CV Test Setup 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
129. e sa 8188 j amp 3 g Sag 5965 6690 gozn 5966 6690 NNN N amp G9GGo oo 9310 9509 DUO OOOOOOOO C427 417 re d b Figure 6 9 4 AC Input Board Assembly Diagram and Test Point Locations SINGLE PHASE AC INPUT LINE U310 15 ULN2003A 9510 14 ULN2003A U310 13 ULN20028 U310 12 ULN2003A U310 11 ULN2003A 9510 10 ULN2003A E415 NEUTRAL U310 PIN PIN NDB 15U oo I G LINE VOLTAGE SELECT SWITCH 2207240 FRONT PANEL LINE SWITCH C430 5281 Bee SS Sa L400 E403 E404 Ej r 438 J301 2 lt lt HPIB BD J301 1 lt FAN SPEED CONTROL 1505 FAN DETECT PRIMARY BIAS SUPPLY p 150 0302 LM317T 2 150 R317 AAA R315 0 245 4 1 4 C207 1 1 0UF C306 Rz16 55 2 61 SECONDARY BIAS SUPPLIES 4400 1 1SU lt 4 J400 2 E411 O RAIL 680K 5x 174W 15Us 4 E412 O RAIL 1505 lt ANN D J500 2 10 14 3U 1N4150 C360 71100
130. e AD t IR RR AE DURER ipee 79 Secondary Interface need eee be e P eee ete e ette e p eee ta e totae aie 79 CV CC Control E tette Gm ge 80 Switching Downprogramming Control eene tetest ettn nete trennen eterne ene 80 A 81 Input ice e UE Ie her 81 Input Filter and Rectilier o PT bt eae esp decode Real 81 Bias Supplies and Bias Detection P 81 Fan Speed Control amt tot ee A3 EET B6 td etum teni 82 Output e tete erri e e De do 2 agrum cesses 85 INTRODUCTION 5 3 ett Ue eed re Leib aro ee 85 Chapter Orgarization rede ERE eb dee ERO P RR e ERU REED RET 85 Reading the Tables ihre ede det he tid pee ftd e hen duet teas 85 How To OrdetParts 5 ua usa tete 86 IUDEX 117 M 117 Chapter Organizations oss nuusan ankata dro anat ap inea mate bea 117 General Schematic NOtes ooo e e etai te oen eei eU eot ose dec denter 123 BACK PIDE 145 Introduction Scope Organization This manual contains information for trou
131. e eet UO ree e eere EE tie ei E re EU 70 ee 71 Rear Panel and or A2 GPIB or Isolator Board sees 71 Output Subchassis e eina ed T RE e rhe aie aan 71 AS Control Board mehr bait a ER E At E EEREU REDE 71 AG Output Eilter Board npud aree n mE ee eio e rete E Ea a 72 7 Snubber Board D900 Output Rectifier n ener trennen teen trennen enne 72 T900 Output Power Transformer L900 Output Choke a eee ennt rennen ener enne 72 AC Input Ellter 5a oce steam deat etis 72 FET Board and Heatsink Assembly eee netten enne us enne tenete nennen 73 A4 AC Input Bo rd edo rdum ee EGO FORES FO RUPEE 74 74 Principles of u 77 Introduction u la E T REE E A 77 INTERFACE CONTROL CIRCUIPS L L tete ong aren ee 77 A2 GPIB Board 667x amp Series iste nre ta a d Aer e Ap ecd e Y EO hasa TT A2 Isolator Board Circuits 657xA Series Only eene teen nennen rne 78 AT Front Panel Assembly uu o RAD t n AI ed E iU PR iR e bc e diee 78 AS Control Boards covers re
132. e tests are independent and may be performed in any order The CC tests are Current Programming and Readback Accuracy Current Sink CC Operation CC Load Effect CC Source Effect CC Noise PARD Table 2 5 Constant Current CC Tests Action Normal Result 1 1 Current Programming and Readback Accuracy This test verifies that the current programming and readback are within specification Turn off the power supply and connect the current monitoring resistor as shown in Figure 2 1B Connect a DVM across the resistor Turn on the power supply and program the output for 5 volts and 0 amperes Short the load Observe the DVM voltage reading Divide this by the resistance of the current monitor resistor Record the result as the Low Current value Record the front panel display readback Program output current to full scale see Table 2 2 Repeat Steps 4 and 5 Value within specified Low Current limits Value within specified readback limits Both current readings within specified High Current and readback limits Current Sink CC and Readback Accuracy This test verifies current sink operation and readback accuracy Turn off the power supply Connect the output as shown in Figure 2 1B except replace the Electronic Load with the external test supply specified in Table 2 1 Set the external supply to 5 volts and its current limit to the CC value of the power supply under test see
133. ead only memory U6 on the A1 Front Panel Board stores data and configuration information This information includes calibration constants GPIB address 667xA Series only the present programming language and model dependent data such as the minimum and maximum values of voltage and current One of the EEPROM storage locations holds a checksum value used to verify the integrity of this EEPROM data Access to the 78 Principles Of Operation 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 with front panel keys or over the GPIB 667xA Series with SCPI Standard Commands for Programmable Instruments commands The calibration procedure is in Appendix A of the Power Supply Operating Manual A5 Control Board The A5 Control Board contains the Secondary Interface the CV CC constant voltage constant current Control Circuits and the Switching Downprogramming Control circuits These circuits are shown schematically on Sheets 1 through 3 of the 5 Control Board schematic Secondary Interface These circuits are shown in detail in the A5 Control Board schematic Sheet 1 and include the Secondary Microprocessor IC U504 the Programmed GAL IC U502 three DAC OP amp digital to analog converter operational amplifier circuits U507 U512 and Readback Comparator circuits U503
134. een updated to remove the measurement uncertainties and correct minor discrepancies in the test limits
135. eld see Figure 3 20 If the LED is there is still hazardous voltage inside the supply Wait until the LED goes off approximately 7 minutes after power is removed before proceeding RFI Shield The RFI shield covers most components on the A3 through A6 circuit boards as well as many of the chassis mounted components Remove the shield as follows 1 Remove four screws on each side securing shield to chassis Lift the RF shield out of the chassis 3 Connect a dc voltmeter across A4TP1 and A4TP2 see Figure 3 19 When the reading is 42 volts or less it is safe to work inside the power supply Troubleshooting 69 Front Panel Assembly Peel off vinyl trim one strip on each side of front 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 Al 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 eU by S1 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
136. ens 53 FET Board Troubleshooting een E En rte niet ie ue e 53 signature ie e n T tU AO REOR Re gad hain cd esten eee 56 Introduction DEA EE FREIE TERES 56 Firmware 5 56 a u 56 Post Repait Calibration 4 5 eo o Gp eiie a eo td hie t rote e mts 63 When Required ebat Rhe eb de den ee tod pee c adn 63 Inhibit Calibration Jumper soin S a aie pal 63 Calibration Password eto a uito eU o e re P ect 63 Restoring Factory Calibration Constants esee eene enne enne DO r saa a uo innen enne 63 EEPROM TInitializatiOn L l 20 hee eene te tee e quoe eee Dee tr quee ee vau ever 64 Transferring Calibration Constants To Factory Preset Locations n ener innen 64 Disassembly Procedures ee hrec ed tali et oe ee 69 POP COVER ss coniicere DEOR ato eate ona eie d a ta de CE ER OO bets iste 69 RE 69 Front Panel Assembly re ORE He au CREE RE MUM elses 70 ST Lines witch Roh nicks MAAR Gn IU e REESE 70 Ad Front Panel Board aeree olet DR e tib mc Vie 70 ATIDSPIECD Display eie eee Rn e tn n e 70 A1G1 and A1G2 Rotary Controls eo ces
137. epe 19 operation verification D De ORCI ri 15 PCTLOLIMANCE MD o 15 programming segue Uo TV ere UE eei bes 15 Tests performance test TeCOEQ us oio re ER ann eC Are 27 TORK SCre RR 72 transformer variable voltage e eet tee ER eec 16 transient recovery Ime epe ee Bele elie eem 16 Troubleshooting test points ertet e eir ERE EC RR RU T ER DURER RT RESI ents ees 125 troubleshooting chart outp t held ERRARE RU UU E etum 47 IR GERE e WR 45 secondary downprogrammng eis iesire ssori her ghe ESEESE TE r o rE EEE rE 56 troubleshooting charts RU lee 37 i enint ees 34 eene tidal anie medie m 34 U UNREGULATED ann nciatot o eo me I tee tee ed e ee eee eH ERR 57 USING TONE sees ES 12 V voltage maximum programmable eret eer a 17 160 Index Manual Updates The following updates have been made to this manual since the print revision indicated on the title page 5 09 Information about the A3 FET assembly has been updated The surface mount A3 FET assembly is the recommended replacement part for previous version A3 assemblies 7 09 The performance test records on pages 24 28 have b
138. eptacle 3114 1251 7330 Connector Receptacle J115 1251 7330 Connector Receptacle P101 1251 4245 Connector Plug 2 pin AC Bias U110 U111 1990 0444 IC Optoisolator U113 1990 0543 IC Optoisolator U117 1820 2549 IC Optoisolator U118 1820 4185 IC Optoisolator 0121 1820 0430 IC Voltage regulator 101 0360 2312 Terminal Block Digital Control MECHANICAL PARTS 1205 0758 Heatsink U121 0535 0031 Nut hex w lockwasher 7101 0515 0642 Screw 0121 0515 0911 Screw M3x0 5 7101 Note All other parts are surface mounted and are not field repairable 94 Replaceable Parts Table 5 7 A3 FET Board Replaceable Parts Ref Desig Agilent Part No Description ELECTRICAL PARTS C201 0160 7505 Capacitor 7uF 200V 5 C210 C211 C213 C214 0160 6838 Capacitor 2200pF 1000V 20 C244 C245 1826 0138 Capacitor 0 1uF 400V 10 L206 L208 L209 L211 9170 2122 Inductor Core toroid J200 1252 0055 Connector Receptacle J201 1251 7616 Connector Receptacle J202 1252 2503 Connector Receptacle Q201 Q202 Q203 Q204 1854 1784 Transistor MOSFFET VCE 600V IC 40A matched set R201 0699 7384 Resistor 150 Q 1 30W R213 R216 R220 R224 0699 7383 Resistor 75 Q 1 30W T202 9100 4350 Transformer Current T204 06624 80091 Transformer Pulse 5188 4203 Cable assembly J201 5188 4208 Cable assembly J202 MECHANICAL PARTS 2110 1319 Fuse clip qty 4 0380 1660 Spacer round qty 4 05
139. es off The power supply is now on without executing power on selftest PA 226 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 30 Troubleshooting Code and or Message Table 3 2 Selftest Error Codes Messages Description Probable Cause Selftest Error Codes Messages El FP RAM E2 FP ROM E3 EE CHKSM E4 PRI XRAM E5 PRI IRAM E6 PRI ROM E7 GPIB E8 SEC RAM E9 SEC ROM E10 SEC 5V E11 TEMP E12 DACS 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 interface 5 volt readback t
140. ess to IC pins AP Products No LTC Ammeter Current Shunt To measure output current Agilent 6571A amp 6671A Guildline 9230 300 Agilent 6572A 75A amp 6672A 75A Guildline 9230 100 Oscilloscope To check waveforms and signal levels Agilent 54504A Signature Analyzer To troubleshoot most of the primary Agilent 5005 A 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 or Isolator Board bench 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 selftest Do this as follows Turn off the power supply Hold down the key and turn on the supply Continue holding down the for 2 seconds and wait until the PWR ON INIT indicator go
141. est failed power on and TST Ambient temperature readback test failed power on and TST CV or CC DAC tests failed power on Microprocessor A1U3 ROM AIU4 or address latches AIU8 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 AIUG the power supply must be reinitialized and calibrated RAM A2U108 Microprocessor A2U114 ROM A2U106 Talker listener A2U117 Microprocessor A5U504 Microprocessor A5U504 Comparators A5U513 readback DAC A5U511 U512 or secondary bias supply 5Vs A4U304 Thermistor ASRT770 or comparator 50513 CV DAC 50507 0508 CC DAC A5U509 U5 10 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 Serial data line failure on A2 board Serial data line failure on A2 board UART failed See Figure 3 10 system or Figure 3 11 bench See Figure 3 10 system or Figure 3 11 bench UART A2U112 FRAMING OVERRUN SBUF OVERRUN UART failed UART failed Serial buffer failure UART UART 20112 UART A2U112 UART A2U112 defective or GPIB board is in SA mode UART A2U112 defective or GPIB board is in SA mode EEPROM AIUG defective or calibration error See Figure 3 12 SBUF FUL
142. f Desig R937 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R938 Model specific 6571A 6671A 6572A 6575A 6672A 6675A T900 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A U901 Model specific 6571A 6671A 6572A 6575A 6672A 6675A VR901 VR902 Model specific 6571A 6671A 6572A 6672A 6573 6575 6673 6675 W900 901 W910 911 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6575A 6674A 6675A W912 913 Model specific 6571A 6574A 6671A 6674A 6575A 6675A W914 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6575A 6674A 6675A 114 Replaceable Parts Agilent Part No Description ELECTRICAL PARTS Not used 0698 4416 Resistor 169 1 0 125W 0757 0274 Resistor 1 21K 1 0698 4416 Resistor 169 1 0 125W 8159 0005 Resistor 0 Not used See Main Chassis Electrical Parts 9100 4909 Transformer power 9100 4946 Transformer power 9100 4945 Transformer power 9100 4910 Transformer power 9100 4944 Transformer power Not used 1826 0890 IC LN358A 1902 0960 Diode zener 12V 5 Not used 1902 0960 Diode zener 12V 5 Not used 1251 4180 Connector R902 ISEN Not used 5080 2177 Not used Not used 5080 2177 Not used 5080 2177 Not used Table 5 10 A6 output Filter Board Replaceable Parts continued Ref Desig Description W915 Model specific
143. face testing isse aede so 34 sens terminals e eit dex PC e aeu Be EA 17 serial number EEEE EEE E Ie edem 12 serial miriber dendi tpe ee dite ps t erede eee ee lee ete penne tae piper ieu teer eee poe 12 settling t me o oen EUER EE EE ERR buss EE E CRUEL 17 Signal name 124 Signals 3 5 V bias voltage etae AE SAREE At e IE BAM OAM AEE 84 BS Risk Ree R 84 PGER emo angu eee 84 RESET S 5 tete e tenia ed e e eed e died n 84 RD te Sitesi Lp X 84 SPCER prie FO HERE ERE OE HER RI E DUE D 84 P qc 84 kaa aant ito dui 4 XEMR T 1 RAMAN BAIR AUS e Go ea Beats 84 slew Lat obe Dead bite picco Dp mE 17 T test AP 15 test equipment troubleshooting eese nennen enne 34 test Deaders s fe ed i A 60 test leads E ENS 17 testmeasu rerients e 23 test points repe tbe ie ete ee eb e 61 Test point Ee eerte E M ee PII ie tI 130 tests ERN 19 Index 159 constant voltage mode aea Gt eaa itenim R ESE hawa p Z pasu 19 independent order 3 A ee bae bee
144. ge 91 Change A1 Front panel board for 667xA Series to part number 5060 3400 In Table 5 3 on page 92 Change G1 and G2 to part number 0960 0822 In Table 5 3 on page 93 Change Knob for G1 and G2 to part number 0370 1091 In Table 5 4 on page 96 Change U4 to part number 5080 2208 CHANGE 40 In Table 5 9 on page 106 and on schematic Figure 6 12 Delete C691 and 692 Backdating 153 Index A A1 Front Panel Board test header cere eere EXE 61 GPIB Board test header o e eter neben bii ten 61 A3 FET Board dynamic troubleshooting nea Gto eene tenete t eere eite p i tisa 58 static troubleshooting 5 epe ebbe S dera qe ertet eet tet e tds 57 test connections ne o ORT reine o DOR ne DIRE 57 57 58 DOE 1 Agilent 50504A oscilloscope Ae es A ea p e e A 34 Agilent S45 A logic probe ee OT rn ep e derniere adire 34 B Blas SUP pl D oe pep o RUE PORE IF EI UU NEP RODA RODEO IURI ID RUE EE 36 cable W233 ELD DOM ec acciones og oce tette eode 75 WA phone sauna e eee ihe MAL T 75 WS phone eee br geo tore N estes ee See 75 WG C M 74 Cabling LEUR 131 calibration constants factory tete et trece 67 calibration pas
145. gure 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 A5 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 50504 20 common 5 Use the signature analyzer probe to take the following signatures Power Microprocessor 5 V 1C4C 50504 1 F77H 50504 2 98 50504 3 1573 50504 4 2 50504 5 UHF8 50504 6 50 50504 7 UH8C 50504 8 23UC 50504 9 0000 50504 10 IC4C 50504 11 IC4C 50504 12 C76F 50504 13 0042 50504 14 2189 50504 15 IC4C 50504 16 1C45 50504 17 0010 50504 18 IC4C 50504 19 IC4C A5U504 20 0000 50504 21 0 98 50504 22 5PC7 A5U504 23 0000 A5U504 24 6CAP A5U504 25 A339 A5U504 26 A319 A5U504 27 A339 A5U504 28 0C98 A5U504 29 IC4C A5U504 30 0000 A5U504 31 IC4C A5U504 32 0000 A5U504 33 0000 A5U504 34 1C47 A5U504 35 0000 A5U504 36 OUPU A5U504 37 UF7P A5U504 38 347F A5U504 39 CP47 A5U504 40 IC4C 6 After completing the tests be sure to return the J3 jumper to its original position
146. heat sink 5 Screw mch M4x0 7 8 mm lg Qty 2 for Isolator to chassis mtg Standoff Qty 2 for Isolator to chassis mtg Flatwasher Qty 2 for Isolator to chassis mtg Split washer Qty 2 for Isolator to chassis mtg Nut Qty 2 for Isolator to chassis mtg Cover for Isolator to chassis mtg Screw mch M3x0 5 16m lg fan Screw mch M4x0 7 12 mm lg line choke busbar to support output choke output xfmr diode block Screw mch 4 0 7 8 mm lg cap RFI fan brkt GPIB cover A6 output Filter bd gnd A5 Control bd to subchassy diode block and A7 Snubber bd to heat sink Screw mch 4 0 7 50 mm long bias xfrmr Screw mch M5x0 8 10 mm long strap handles Screw mch M3x0 5 10 mm long FETs to sockets Screw mch M4x0 7 8 mm long FET bd mtg Shield RFI Side trim strips Standoff hex 0 255 in GPIB connector Standoff hex 8 mm control bd mtg Standoff slide mtg A5 Control bd to chassis Standoff hex 8 mm FET bd mtg Strap handle Terminal crimp AC power cord Terminal crimp AC power cord gnd Thermal pad Washer flat diode block to heat sink Washer spring diode block to heat sink Washer flat caps to bus bars Washer flat choke to bus bar Washer spring blvl current shunt to A6 output bd Washer flat A6 output and A5 Control bd to subchassis Washer flat current shunt to A6 output bd Washer choke 90 Replaceable Parts Table 5 3 Main Chassis Replaceable Parts continued Ref Desig Ag
147. ilent P N 1205 0861 Qty 1 CHANGE 32 In Table 5 3 CHANGE Fuseholder Clip Type from Agilent P N 2110 0269 to Agilent P N 2110 0726 QTY 2 CHANGE 33 In Table 5 4 CHANGE IC Read Only Memory U4 Agilent P N 5080 2208 from Fabricated To Purchased CHANGE 34 In Table 5 3 ADD Collar RPG P N 5040 1700 Qty 2 CHANGE 35 In Table 5 3 CHANGE Part number of the A2 GPIB board from P N 5060 3399 to P N 5060 3291 152 Backdating In Table 5 6 REPLACE Table 5 6 A2 GPIB Board Parts List in Section 5 of this manual with the A2 GPIB Board Parts List shown in Table in the next page REPLACE 2 GPIB Board Component Location diagram in Section 6 of this manual with the A2 GPIB Board Component Location Diagram shown in Figure A l at the end of this appendix CHANGE 36 In Figure 3 18 sheet 1 on page 72 Change first data value on program line 360 from 1296 to 1304 In Table 5 3 on page 91 A2 GPIB board to 5060 3399 In Table 5 3 on page 92 Change DSP1 to 5061 1190 In schematic Figure 6 14 Add D910 D911 R910 and VR902 to the down programming circuit This section of the circuit should match Figure 6 16 These components are model dependent In Table 5 6 on page 98 Change the part number of U121 to 1820 0430 CHANGE 37 In Table 5 5 on page 97 Change F800 to 5A normal blow part number 2110 0669 CHANGE 38 In Table 5 10 on page 118 Change Q901 902 and 903 to part number 1855 0835 CHANGE 39 In Table 5 3 on pa
148. ilent Part No Description MECHANICAL PARTS continued 3050 1690 Washer spring choke to bus bar choke to xfmr bus to heat sink transformer to diode block 2190 0034 Washer lock hlcl caps ac input 2190 0586 Washer lock hlcl GPIB connector 3050 0002 Washer flat caps ac input 3050 1690 Washer spring bus bar 2190 0586 Washer lockwasher hlcl A3 FET bd mtg 3050 0893 Washer flat A3 FET bd mtg 1000 0842 Window front panel display MISCELLANEOUS 5080 2148 Chaining cable for power supply link 1252 1488 Quick disconnect mating plug for DIG CNTL connector on rear panel 1252 3698 Quick disconnect mating plug for analog connector on rear panel Quick Start Guide European see 5959 3372 5959 3372 Manual Series 667xA operating 5959 3398 Manual Series 667xA operating 8120 5488 Option 831 12 AWG power cord w o plug 8120 5490 Option 832 4 sq mm power cord w o plug 8120 5545 Option 834 10 AWG cord w o plug 8120 5491 Option 841 12 AWG cord with plug NEMA 6 20P 8120 5489 Option 842 4 sq mm power cord with plug IEC 309 32A 8120 5487 Option 843 12 AWG power cord with plug JIS C8303 8120 5546 Option 844 10 AWG power cord with plug NEMA L6 30P Replaceable Parts 91 Table 5 4 A1 Front Panel Board Replaceable Parts Ref Desig Agilent Part No Description ELECTRICAL PARTS Cl 0160 5422 Capacitor 0 047uF 20 C2 0160 4808 Capacitor 470pF 5 C4 0160 4787 Capacitor 22
149. inting 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 material since the previous printing date Changes to the manual occurring between revisions are covered by change sheets shipped with the manual Also if the serial number prefix of your power supply is higher than those listed on the title page of this manual then it may or may not include a change sheet That is because even though the higher serial number prefix indicates a design change the change may not affect the content of the manual Edition 1 October 1993 Edition 2 September 2000 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 PENEN ARE O E A E A 7 Ha Need ites deemed eene ene dp E oti edes 7 M 7 Related Documents uy sua nta d ertet ete 7 Change Sheet eon eG PG eae OR Ut ea 7 Operating asnan
150. 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 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 Averaging the CC 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
151. ltage 120V Vou Front Panel Display Readback Load Effect Source Effect PARD Ripple and Noise Peak to Peak RMS Transient Response Time at 900 us Constant Current Tests Current Programming and Readback Low Current Iout Front Panel Display Readback High Current 18A Iou Front Panel Display Readback Current Sink 2 5A Display Readback PARD Ripple and Noise RMS Load Effect Source Effect 120mV Vout 180mV 119 832V Vout 240m V V out 6 4M V V out 6 4M V 12mA Tour 18mA 17 97A Tour 30mA Link 20 5mA 0 120mV Vou 180mV 120 168V Vou 240m V Vou 6 4mV Vout 6 4mV 12mA Tour 18mA 18 03A Tour 36mA 20 5 12mA Tour 1 9mA Tour 1 9mA Enter your test results in this column 28 Verification 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 This instrument uses components that can be damaged or suffer serious performance degradation due to CAUTION ESD electrostatic 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
152. mbly 9 eter ette eee er eb Her t e be eese orc e 75 i ROUTER s 76 1 900 output oerte ete Ine na ite nee a hehe 76 hne SWIC Diss s eae 74 OULPULSUDCHASSIS tee UE e SUR 75 Tap panela a PEE 75 158 Index RFI ES n SI lo TECH e 73 RPG controls eerte deeem dece D A ect bee 74 output transformer endete e Diner DTE RO IRE 76 suec 73 Replaceable parts for A2 isolator board SEU nea ibi eee 97 resistor Current t eti ROC UH Ue 16 load aite RE EUR De dati ian a iH 16 current Motoi seed cca cct err n E satan Se E e o Qy pa c rers ed 23 resistor current monitoring A qe UR 24 S tee 60 SA Secondary interface extis tests a oie e e vtt een beta permease iota imu dedii rdv s 66 SA signals 5 ThICTODIOCO SOT teet 66 SA signals secondary interlace eeu neto e emite pU PI IO rer DIR OR 66 S A Strenatures adentical or er iie ea obtu on t eura 60 SA signatures Similar o iso E dU diede Um RE ES 60 SA test header eR puna chek RERO e tet ber IO RE Eee Ene MIR 61 Schematic NOLES P sees sap 129 SCPL pro ue ERU 11 secondary inter
153. me po 19 2 7 SH 01 36 5 0 pali9 0052 321508 ps 15 prog p4 4 003 39 13 D 2 0103 41 220102 0101 23 gt CONT 0117 99014 TRIG i PREN ACCRA 19 ACCG REN 18 25 IFC 16 22 NRFD 17 NDRC 15 29 DAU 14 30 EOI 13 31 12 SRQ GND HSRG 22 ISRG 500 C142 V 420PF 50U Y A 0 15 50 C132 047 500 ROM CLOCK FP HPIB PTX UART FPRX RDY BANKSEL ISRQ RD DFI EN WR SRX AC6 5U C135 ER 22 200 C137 102 0 1 L101 90V 22PF R144 0 42UH 100 5L C123 C126 ae R143 e m A XTAL1 66 Tay 27 R140 as 905 13 Sa 1504 12 4 64K HSO3 54 HSO2 MSRQ 5g 501 55 500 RI 5 51 HSIO 1 01 38155 5L 1 02 55 P2 R141 P2 22 pa 4 64K 44 55 15 2 17 18 RxD TxD PREN 8 4 64K R129 10 PO ma P 882 aes ni 4 64K 2 5 4 64 Slpo 4 13 TSL TR 2 t AGND 2 0 1 086 16 RESET x2 27 RDY 6 80 U114 3 80C196 55 NMI CLOCK CLKOUT C139 BUSWIDTH 7047 USS2 0551 Sou V DFI_EN FPTX PRX STX HSRQ CLK1 CLK2 1MHZ 16 AC4 15 AC3 14 R 2 13 AC1 ES CLEUIS PCB MTG E6 HOLES CLEUIS U106 no 11 ACO 19 act ROM 25 al aci
154. 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 product Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met Safety Symbol Definitions Symbol Description Symbol Description Direct current g Terminal for Line conductor on permanently installed equipment Alternating current Caution risk of electric shock d Both direct and alternating current d Caution hot surface qr Sue Three phase alternating current Caution refer to accompanying documents Earth ground terminal L In position of a bi stable push control Protective earth ground terminal Out position of a bi stable push control 1 Intended for connection to external protective conductor Frame or chassis terminal On supply N Terminal for Neutral conductor on Off supply permanently installed equipment Terminal is at earth potential Standby supply Used for measurement and control 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 a qualified electrician install an external switch Pr
155. nd through a power source equipped with a 3 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 8 Introduction Hazardous voltage exist within the power supply chassis at the output terminals and at the analog programming terminals Conventions 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 In this manual all Agilent 667xA Series supplies are referred to as system supplies All Agilent 657xA Series supplies are referred to as bench supplies Electrostatic Discharge The power supply has components that can be damaged by ESD electrostatic discharge Failure to CAUTION h 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 Working at a static free station such as a table covered with static dissip
156. nt Record the result Short the Electronic Load input and repeat Step 4 Check the result Normal Result You may want to use an averaged reading for this measurement You may want to use averaged reading for this measurement The difference between the current readings taken in Step 4 and Step 5 must be within specified Load Effect limits 1 CC Source Effect 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 Figure 2 1 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 174Vac or 191 Vac 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 220Vac or 250Vac 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 This test measures the change in output current resulting from a change in ac line voltage from
157. nubber Board to the heat sink and remove the board 3 Remove two bolts securing D900 to the heat sink and remove D900 Note When replacing D900 follow the procedure given in Figure 3 19 T900 Output Power Transformer L900 Output Choke 1 Remove the bolt and nut that connect transformer T900 and choke L900 leads together two from T900 and one from L900 The bolt is accessible through a hole in the Output Subchassis 2 Remove T900 or L900 by removing the four screws that secure each component to the Output Subchassis AC Input Filter 1 Remove the Top Cover and the RFI Shield as described in their respective procedures 2 Remove the A2 board as described under Rear Panel and or A2 GPIB or Isolator Board earlier 3 Disconnect the ac line and neutral output lines going to the A4 AC Input Board load side of the filter 4 Remove four screws securing the Input Filter to the chassis and lift the filter out of chassis When you replace the filter connect the load side to the AC Input Board 72 Troubleshooting START 2 3 TURNS FINGER TIGHT 2 3 TIGHTEN A AND BETWEEN 5 AND 10 IN LBS TIGHTEN BETWEEN 8 AND 10 IN LBS TIGHTEN A AND BETWEEN 30 AND 40 IN LBS DON FIG3 19 GAL Figure 3 19 Proper Mounting Procedure for Output Rectifiers D900 A3 FET Board and Heatsink Assembly 1 Ce ty Disconnect cables wires from the following points a 15Vp bias cable W8 from A4J400 on the AC Input Board
158. oard can be removed from the power supply without first removing the Output Subchassis as previously described If the output subchassis has not been removed disconnect cables from the A5 board as described in Step 4 of the Output Subchassis and then remove the A5 board as follows Troubleshooting 71 Remove two screws securing the board to the Output Subchassis Slide the A5 board upward and free of the two standoff mounts and the plug in connection A5J510 A6J900 with the A6 Output Board 3 Remove board from the output subchassis N A6 Output Filter Board 1 Remove the A5 Control Board as described in that procedure 2 the Output Filter Board remove the nut securing the lead from choke L900 3 Remove the bolt that secures the Output Filter Board OUT out bus bar to the heat sink 4 Remove the screws that secure the Output Filter Board downprogrammer MOSFETs 0901 0902 to the heat sink Use size T 10 TORX screwdriver Note Apply a thermal compound before you reconnect 0901 0902 to the heat sink 5 Remove three screws that secure the Output Filter Board to the Output Subchassis 6 Slide the Output Filter Board forward to release it from stand offs 5 and lift the board out of the subchassis A7 Snubber Board and D900 Output Rectifier 1 Remove two bolts securing the leads from the Snubber Board and transformer T900 to output rectifiers D900 mounted on the heat sink assembly 2 Remove screw securing the S
159. orrect 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 1 Turn off the supply and remove the top cover 2 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 3 Turn on the power supply and note that ADDR 5 and then PWR ON INIT appear briefly on the front panel display 4 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 5 _ Turn on the supply You may now set a new password if desired and recalibrate the power supply Troubleshooting 63 EEPROM Initialization EEPROM AJIUG on the A1 Front Panel Board stores the supply s GPIB address model number and constant
160. ower supply output Principles Of Operation 81 Fan Speed Control A fan speed control circuit U304 U311 provides the dc voltage to operate the cooling fan A pulse width modulated signal FAN_PWM from the secondary microprocessor on the A5 Control Board varies this voltage to increase or decrease the fan speed according to the ambient temperature The secondary microprocessor determines the level of FAN_PWM by monitoring a fan speed signal FAN_DETECT and the ambient temperature as measured by the voltage drop across a thermistor A4RT300 Chassis mounted fan BI is shown on A4 AC Input Board schematic A3 FET Board The A3 FET Board has 8 power FET stages and 2 bridge driver IC s see A3 FET Board schematic The power FETs are mounted on but are electrically isolated from a heat sink assembly The FET stages are connected from the RAIL and the RAIL to the power transformer T900 in an H bridge configuration DRIVE A and DRIVE B pulses received from the A5 Control Board are used by the bridge driver ICs U201 and U202 to derive control pulses DRIVEI and DRIVE2 for the FET switches The width of these pulses determines the ON time of the FET switches thereby determining the magnitude of the output voltage or current DRIVEI pulses turn on one set of RAIL Q201 Q211 and Rail Q203 Q233 FETS causing current to flow through power transformer T900 in one direction DRIVE2 pulses turn on the other set of RAIL Q204 Q244 and R
161. ows the power supply firmware revision for which the table is 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 A5U504 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 IDN 30 ENTER 705 1 40 DISP L 50 END For a typical Model 66714 the controller will return a string with four comma separated fields as follows Agilent Technologies 6671A 0 fA 01 05sA 01 04pA 01L01 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 p primary interface firmware revision A 01 01 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 56 Troubleshooting Pins Description Primary Interface Test Connector A2J106 Systems Supplies Only 7 and 8 FLT INH 1 and 2 SA Mode 3 and 4 DIG I O 5 and 6 RELAY LINK Normal operating and storage position DIG CNTL port is configured for fault indicator
162. pF 5 100V C5 0180 0155 Capacitor 2 2uF 20V C6 7 0160 5422 Capacitor 0 047uF 20 C8 0160 4835 Capacitor 0 1 10 50V C10 12 14 16 0160 5422 Capacitor 0 047 20 C17 0180 0155 Capacitor 2 2uF 20V D122 1906 0229 Diode array 50V J2 1251 4927 Receptacle LCD display J3 1251 4926 Receptacle test header 14 5 1252 0718 Receptacle A3G1 A3G2 J6 1251 8184 Receptacle phone GPIB board L1 9140 0158 Inductor 1uH 10 1810 0560 Resistor network DIP R2 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 RTI 0837 0412 Thermistor VR16 1902 0950 Diode zener 4 7V 5 U3 1820 6721 IC MPU U4 5080 2466 ROM programmed front panel U6 1818 4792 IC memory U8 1820 2724 IC SN74ALS573BN W3 1258 0209 Jumper 73 W5 0811 3590 Jumper YI 0410 2159 Crystal 10Mhz MECHANICAL PARTS ES 1200 1274 Socket IC U3 1200 1417 Socket IC U4 0340 1277 Insulator 1 92 Replaceable Parts Table 5 5 A2 Isolator Board Replaceable Parts for 657xA only Ref Desig Agilent Part No Description ELECTRICAL PARTS C800 0160 5422 Capacitor 0 047uF 20 C801 0160 4822 Capacitor 1000pF 5 C802 0160 4822 Capacitor 1000 5 C803 0180 3167 Capacitor 1000 25V C804 0180 4129 Capacitor
163. quired 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 nl superscript is needed for the Operation Verification test Current Monitoring Resistor The four terminal current monitoring resistor listed in Table 2 1 is required to eliminate output current measurement error caused by voltage drops in leads and connections The specified load resistors have special current monitoring terminals inside the load connection terminals Connect the AC or DC voltmeter directly to these current monitoring terminals Verification 11 Table 2 1 Test Equipment Required Required Characteristics Recommended Model Resolution 10 nV 1V Readout 8 1 2 digits Digital Voltmeter Agilent 3458A Accuracy 20 ppm Agilent 6571A 6671A 0 001Q 0 04 300A 100W Current Monitor Resistor Agilent 6572A 6575A 6672A 6675A 0 010 0 04 100A 100W Guildline 9230 300 Guildline 9230 100 DC Power Supply 5V 10 Agilent 6653A Electronic Load Range Voltage and current range must exceed that of supply under test Power 2KW minimum Agilent 6571A 6574A 6671A 6674A Agilent 6575A 6675A Oscilloscope Sensitivity 1mV Bandwidth Limit 20MHz Probe
164. r Es 157 ANAC 0 17 19 V CONSTANT VOLTAGE D A 150 50 c512 R513 047 i 100K R514 18 100K U509 PM 7545 20 DB11 RFB C523 DB10 DB9 1500PF DB8 100U DB7 DB6 DBS OUT1 DB4 AGND gt CCPROG 083 OGND L 1 0 10U DB2 4 DB1 DB0 15U 16 ure ES 19 CONSTANT CURRENT D A V 50 Yw C515 FAN_SENSE 047 AMB_SENSE 50V 15 v LPZ65 511 16 13 PM 7545 20 R521 DB11 RFB DB10 DBS NZ 15U DB8 11 6 P Q OUTPUT BD gt CONNECTOR 085 OUT1 DB4 AGND 085 DGND DB2 C507 DB1 047 lt Z 61 5 WR user 19 SUCCESSIVE APPROXIMATION A D UFSC URG VDP 150 NOTE AN ASTERISK NEXT TO A RESISTOR OR CAPACITOR INDICATES THE COMPONENT VALUE CHANGES WITH C555 C556 OUTPUT VOLTAGE RATING 38 0 1 1 THE VALUES SHOWN ON THE SCHEMATIC ARE FOR THE 500 35V 60V MODEL THE VALUES FOR ALL OTHER MODELS ARE GIVEN IN TABLE 5 9 Figure 6 12 A5 Board Sec amp CV CC Readback DACs Schematic sheet 1 DO NOT LOAD C703 C 01 50 REF sov vos gt L R702 C670 R807 J 1M R802 130K R804 130K LF412 4 Es 150 1 16 15K CC CLAMP AMP E 1 50V C671 STATUS COMP R892 150 R805 25K 054 C720 17104 1 50V 11 ARATORS gt 150 e 5 REF vs VIC HI R717 3 16M 1 HI est alr III 7 10 U615 8 0685 2 86 750626 N7D627 vy 2
165. r comes on 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 1 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 Action CV Source Effect cont Set the transformer to the nominal ac line voltage Connect the DVM across LS and LS see Figure 2 1A 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 the front panel display Adjust the transformer to decrease the ac input voltage to the low line condition 174Vac or 191 Vac Record the output voltage reading of DVM 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 Check test result Normal Result CV annunciator is on If it is not adjust the load to slightly reduce the output current until the annunciator comes on The difference between the DVM readings in steps 5 and 6 are within the specified Source Effect limits Periodic
166. s 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 Connecting 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 Replacement of line fuse and conversion of line voltage Calibration procedure front panel and remote Introduction 7 Instrument Identification The power supply is identified by a unique two part serial number such as US36320101 The items in this serial number are explained as follows Item Description US Indicates the country of manufacture where US USA 3643 The year and week of manufacture or last significant design change Add 1960 to the first two digits to determine the year For example 36 1996 The last two digits specify the week of the year 0101 A sequential number assigned to each power supply 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
167. s bar minus Model specific 88 Replaceable Parts Table 5 3 Main Chassis Replaceable Parts continued Ref Desig Agilent Part No Description MECHANICAL PARTS continued Bus bar plus Model specific 6571A 6671A 06671 00009 6572A 6672A 06671 00009 6573A 6673A 5001 6751 6574A 6674A 5001 6751 6575A 6675A 5001 6751 5041 8819 Cap strap handle 5041 8820 Cap strap handle 5060 3334 Chassis assy 1400 0611 Clamp cable phone cable 1531 0309 Clevis A2 GPIB bd 9170 1138 Core mtg assy 5001 6745 5001 6758 Fan bracket 5001 6747 FET chassis 5020 2741 FET heat sink 5001 6748 Front panel 5040 1664 Front panel frame 5020 2740 Heatsink diode 0340 0458 Insulator mica FETs to heat sink 0370 3238 Knob front panel RPG control 6571A 06571 80001 Nameplate 6572A 06572 80001 Nameplate 6573A 06573 80001 Nameplate 6574A 06574 80001 Nameplate 6575A 06575 80001 Nameplate 6671A 06671 80001 Nameplate 6672A 06672 80001 Nameplate 6673A 06673 80001 Nameplate 6674A 06674 80001 Nameplate 6675A 06675 80001 Nameplate 0590 0534 Nut self threading display to front panel 0535 0002 Nut hex shunt to PCB 0535 0031 Nut hex w lockwasher bus bar to output bd 0
168. s 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 I or Factory Preset Replacement F 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 I or Factory Preset Replacement F F The new calibration constants will then be stored Pre initialized and tested A1 Front Panel boards are available for Analog Programmable bench series supplies see Chapter 5 Table 5 4 for part numbers A Bench Series Supply can be initialized and the new Factory Preset calibration constants loaded by temporarily replacing the A2 Isolator
169. sed to program the output current The IP signal is applied to the CC Error Amplifier via the IPROG Amplifier P O U618 A 0 to 10V differential input level produces a proportional zero to full scale output current Switching Downprogramming Control These circuits A5 Control Board schematic Sheet 3 include a Ramp Generator Fast Sense Differential Amplifier Summing Amplifier Divider Pulse Width Modulator Downprogramming Control and Overvoltage Comparator circuits The OR GATE signal CV or CC control signal as previously described is summed with a fixed 40 KHz triangular waveform produced by the Ramp Generator An input from the Fast Sense Differential Amplifier also is summed in order to compensate for sudden transients in the rectified output The Ramp Generator derives its output signal from 40KHz pulses received from the Divider circuit The Divider circuit also generates output pulses for a Deadtime Latch and an On Latch The Divider clock input is the 2MHz ALE CK signal from 80 Principles Of Operation the secondary microprocessor The width of the output pulses from the Summing Amplifier vary as the OR_GATE control signal decreases or increases These pulses are applied to the Pulse Width Modulator IC via the On Latch The Pulse Width Modulator generates the square wave pulses that are applied to the A3 FET Board to turn the FET switches on and off The Deadtime Latch resets the On Latch to provide a minimum dead off time for the
170. shown on the front panel display Observe the reading on the rms voltmeter Divide this voltage by the resistance of the current monitoring resistor to obtain the rms noise current The power supply output current should be at its full scale value and the CC annunciator on If it is not adjust the load to slightly reduce the output voltage until the annunciator comes on Current is within the specified PARD rms limits 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 4 and 5 of this test see Averaging AC Measurements at the end of this chapter 1 Turn off the power supply and connect a DVM across the current monitoring resistor see Figure 2 1 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 indicated on its front panel display 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 20 Verification Table 2 5 Constant Current CC Tests continued Action CC Load Effect cont Observe the DVM reading Divide this by the resistance of the current monitoring resistor to obtain the output curre
171. stent dts 34 l IDN QUGEy s ae A i es GE Ses T eS 60 inhibit calibration jumper nee DORT CIR re IET PIER 67 Isolator Board Circuits nne rere ern ee er e b p eec ee oerte ide 82 J jumper DIG Siete SESS E REED 002 S Susa 61 FACTORY PRESET CAL ce need DH e DPI edite Doe Ip 61 INHIBIT CAL 222 61 sni 61 K aa uq 17 L line fuse replacing ERE eae n TAA 11 Line voltage Conversion OF u un Pet m chien eU ce VAR HEP Se 11 M Index 157 manual EE 12 manual changes sheet ue ees chee ee ie eh iid hee eni 12 13 manufacturing date determining i uon reu tu hun REO D Fuer REO TU REDE ERE Re 12 message PWR ON N ERR ERE nir tot vier RE 34 67 Mnemonics SPHERE 124 mutual ee Boe cive ede iet e 17 N Wrap 15 Operating LET 11 oscilloscope Agilent 545044 teet ib teet eem a a a ae eee te irte 16 output heatsink assembly asua anu nu zoo e t RU HERES te OUR 75 output rectifiers location Of i e emo E RP BO dn EE 75 Teplacimng zone hed ed OI ES 76 overvoltage maximum programmable
172. swotd e re Det tere D DR eae P o S p 67 calibration post repatt oe sees mee RU ec bim iEn EH RR UU 67 calibration procedures m Q uU a U trit RR EE P REA Ca k PER Senna EE 11 CC annunclatOoE REIR Reale Relea UR esis Set Me Be aie 57 CC load effect testing vss Doer egt rto Dire em eee 24 CC noise PARDJ t68 fig ice e teorie nete erate akawa edet i 24 CCPARD defined too UIROS iq ER 24 Circuits isolator board oap Der ar ERI eere epa ep e DOR che 82 conductive table S 13 conductive Wrist strap ioo eterne e eats SS eA eese 13 configuration jumper FACTORY PRESET CAL apana DOR Di oe DOR e 61 FIEST UNLIL rer nt tete vr er e b E d E er e ee dete e te de euis 61 INHIBIT CAL caitlin ie RED EU meten e e 61 RELAY EINK sene a na theca 61 SAMOS tto e Dorn Tcr ed DU Rd 61 current maximum programmable oi Ee eerie e Sheets 17 CULE OC E eta aie tete dien oie esiste aa rd PO 17 current programming and readback accuracy 18 current sink and readback accuracy testing nennen 2 8 status annunclatOrs e cepe terae eee de lieu e dp te estet ordo ge eres Ee edens 23
173. the pulse width modulator disabled the drive signals for the FET regulators are removed thereby turning off the power supply output When OV is reset the secondary microprocessor generates OVCLR output protection clear which clears OVSCR During power initiation the secondary microprocessor generates an INHIBIT signal to hold the supply s output off for ten seconds After 10 seconds INHIBIT is removed and the output can be programmed CV CC Control These circuits are shown in detail on the A5 Control Board schematic Sheet 3 and include CV constant voltage and CC constant current control loops The power supply must act as either a CV or CC supply for any value of load impedance Switching between CV and CC mode 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 U630 and returned to the secondary interface to indicate that the corresponding mode CV or CC is in effect In CV mode an OR gate diode D620 conducts and the CV loop regulates the output voltage A CV Error Amplifier P O U615 compares the programmed voltage signal CVPROG 0 to 10V range to VMON which is the output voltage monitor output signal of V_DIF Differential Amplifier P O U615 The range of VMON is 0 to 10V which corresponds to the zero to full scale output voltage of
174. 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 OR_GATE goes high to cause the output voltage to increase to the programmed value An externally applied dc signal VPROG can also be used to program the output voltage A 0 to 5V VPROG level produces a proportional Zero to full scale output voltage In CC mode an OR gate diode D615 conducts and the CC loop regulates the output current A CC Error Amplifier P O U612 compares the programmed current signal CCPROG 0 to 10V range to IMON which is the output current monitor signal This signal is produced by measuring the voltage across a current monitor resistor A6R907 on the A6 Output Filter Board The voltage drop across A6R907 ISEN is amplified by 1st I AMP U617 and 2nd 0612 to produce current monitoring signal IMON The range of IMON is 0 to 10V which corresponds to the zero to full scale output current of the supply If the output current exceeds the programmed current the OR GATE gate signal goes low causing the output current to decrease to the programmed value Conversely if the output current is less than the programmed value the GATE signal goes high causing the output current to increase to the programmed value An externally applied differential voltage signal IP can also be u
175. toroid 6574A 6674A Not used 6575A 6675A 9170 1517 Coil toroid L904A 904B Model specific 6571A 6573A Not used 6671A 6673A 6574A 6674A 9170 1512 Coil toroid 6575A 6675A Not used Q901 Model specific 6571A 6671A 1855 0834 MOSFET power 6572A 6672A 5182 9080 MOSFET power 6573 6575 1855 1003 MOSFET 6673A 6675A Q902 Model specific 6571A 6671A Not used 6572A 6672A 5182 9080 MOSFET power 6573A 6575A 1855 1003 MOSFET 6673A 6675A Q903 Model specific 6571A 6671A Not used 6572A 6672A 6573A 6575A 1855 1003 MOSFET 6673A 6675A Q910 Model specific 6571A 6671A Not used 6572A 6575A 1853 0510 Transistor PNP 6672A 6675A R901 904 0757 0489 Resistor 10 5 0 25W R905 906 0683 0475 Resistor 4 7 5 0 25W R907 Model specific 6571A 6671A 06671 20001 Shunt current 250A 6572A 6672A 06672 20001 Shunt current 125A 6573A 6673A 06673 20001 Shunt current 75A 6574A 6674A 06674 20001 Shunt current 50A 6575A 6675A 06675 20001 Shunt current 20A R908 0683 2755 Resistor 2 7M 5 0 25W R909 Model specific 6571A 6671A 0698 3311 Resistor 51 5 2W MO 6572A 6672A 0698 3630 Resistor 300 5 2W Mo 6573A 6673A 0764 0016 Resistor 1K 5 2W Mo 6574A 6674A 0683 2755 Resistor 3K 5 2W Mo 6575A 6675A 0698 3646 Resistor 12K 5 2W Mo 112 Replaceable Parts Table 5 10 A6 output Filter Board Replaceable Parts continued Ref Desig R910 Model specific 6571A 6671A 6572A 6672A 6573A 667
176. ulator IC U121 that 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 A2 Isolator Board Circuits 657xA Series Only The isolator board performs the following two functions 1 Creates a 5V bias voltage 2 Provides isolation between the PCLR RxD and TxD front panel signals and similar signals received from the A1 Main Board When power is turned on to the power supply an isolated AC signal from XFMR 1 in the secondary circuits is applied to a 5V bias supply U805 on the isolator board The bias supply produces a 5V BIAS output voltage that is routed to the front panel circuits At the same time a low SPCLR level from the secondary circuits is applied to optical isolator circuit U800 It is then routed as a low PCLR level to the RESET input of the front panel microprocessor This low level keeps the microprocessor temporarily disabled during power turn on for a short time interval After a delay of 40 ms SPCLR goes high and the microprocessor is enabled By inhibiting microprocessor operation for 40 ms any erroneous
177. uments 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 Be sure to use the correct test setup connections for the specific test When examining an IC note the correct signatures for 5V and for common If an incorrect signature matches either one it probably indicates a short to that part of the circuit 3 Iftwo IC pins have identical signatures they are probably shorted 4 If two IC signatures are similar it is only a coincidence 5 Ifaninput pin of an IC has an incorrect signal but the signal source output of the previous IC 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 Firmware Revisions Each signature analysis table in this chapter sh
178. with voltage programmed 1 2 of full scale CVPROG Sheets 1 2 Approximately 4 1V with voltage programmed 1 2 of full scale Note Measurements at test points through where taken under the following conditions 1 Programming a Programming 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 VMON Sheet 2 CV mode 4 6V CC mode 0V CV CONTROL Sheet 2 CV mode 2 4V CC mode 12V CV Sheet 2 CV mode 0V CC mode 5V CC CLAMP AMP output CV mode 2 2V CC mode 2 2V Sheet 2 1ST I AMP output Sheet 2 CV mode 0V CC mode 0 6V 2ND I AMP output Sheet 2 CV mode 0V CC mode 4 5V CC CONTROL Sheet 2 CV mode 15V CC mode 0 4V CC Sheet 2 CV mode 5V CC mode 0V FAST SENSE AMP CV mode 4V CC mode 0V Sheet 3 RAMP GEN Sheet 3 See Figure 6 1 RAMP GEN Sheet 3 See Figure 6 1 DIVIDER output Sheet 3 See Figure 6 1 SUMMING POINT Sheet 3 See Figure 6 1 DEADTIME LATCH Sheet 3 See Figure 6 1 Diagrams 121 Table 6 3 Troubleshooting Test Points continued TEST POINT Signal Tested Measurement and Conditions No amp Loc 55 0605 7 SUMMING See Figure 6 1 COMPARATOR Sheet 3 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 See Figure 6 1 Sheet 3 U604 3 ON LATCH Sheet 3 See Figure 6 1 U603 3 PWM EN
179. ws securing the AC Input Board to the chassis 4 Note 8 of these screws also fasten L400 and T300 to the board via standoffs between the board and the chassis 5 Slide board forward and remove it from chassis B1 Fan 1 Remove the fan cable from A4J302 2 Remove the two screws securing the heatsink brackets to the fan bracket 3 Remove the two screws securing the fan bracket to the bottom of the chassis 4 Remove fan assembly fan and bracket from supply 5 Remove the screws washers nuts securing the fan to the bracket and separate the two Use size T 10 TORX screwdriver 74 Troubleshooting A2 ISOLATOR OR FLI AC FET OUTPUT A6 OUTPUT AS CONTROL GPIB BOARD INPUT FILTER HS ASSY HS ASSY FILTER BOARD BOARD A4 AC INPUT BOARD A3 FET BOARD AXSSSSSSSNSSRSSSSSSNSSSNNNSNANANANSN TES NET QU DOSE A4C416 C419 A4T300 BIAS XFMR FRONT DISPLAY A1FRONT KEYPAD Bi FAN A7 SNUBBER PANEL ASSY PANEL BOARD BOARD TOP VIEW Figure 3 20 Component Locations Top Cover and RFI Shield Removed Troubleshooting 75 Principles of Operation Introduction Figure 4 1 at the end of this chapter is a block diagram showing the major circuits within the power supply The supply s interface and control circuits consist of circuits on the Al Front Panel Board A2 GPIB or Isolator Board and A5 Control Board The power circuits are the A4 AC Input Board A3 FET Board A7 Snubber Board A6 Output Filter Board and a
180. y interface circuits referenced 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 1 12 phone jacks at the rear of each supply The serial link configuration is described in the Power Supply Operating Manual A digital control interface on the A2 GPIB Board provides the following power supply functions Relay link Digital 1 0 Remote inhibit INH Discrete fault indicator FLT An optical isolator IC U113 isolates the FLT output signal common from the external fault circuit common Principles Of Operation 77 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 reg

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