Keysight 669 A Series Service Manual Download Page 38

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Troubleshooting 35

START

"OUTPUT HELD LOW"

THE OUTPUT IS HELD LOW AND PROT IS NOT ON.

TURN OFF SUPPLY, DISCONNECT THE LOAD, REMOVE TOP

COVER AND RFI SHIELD. TURN ON SUPPLY AND CHECK BIAS

VOLTAGES (TEST POINTS 9 THROUGH 22 , SEE TABLE 6-3).

ARE

VOLTAGES

OK?

YES

TURN OFF SUPPLY AND GO TO "A5 CONTROL BOARD TROUBLE-
SHOOTING SETUP" (TABLE 6-3). TURN ON SUPPLY AND PROGRAM

OUTPUT TO 1/2 FULL SCALE VOLTAGE AND CURRENT. PROGRAM

OV TO MAXIMUM, OCP OFF, AND ENABLE THE OUTPUT.

IS CC

ANNUNCIATOR

ON?

YES

IS UNR

ANNUNCIATOR

ON?

USE DIFFERENTIAL INPUT OSCILLOSCOPE

TO CHECK FOR PULSES AT A10J511 62 ,
A10U602-9 52 , A10U600-10 56 , A10U607-1 51,
A10U604-8 59 AND A10U605-7 55 .
SEE CORRECT WAVEFORMS IN FIG 6-1.

IS TP 62

OK?

15V, 40KHz

YES

SEE "FET TROUBLE-

SHOOTING" FIG 3-11

CHECK CV PROGRAMMING

LEVEL AT A10U513-6 39

DOES

TP 56

= -5V?

YES

CHECK VOLTAGE CALIBRATION.
SEE APPENDIX A IN OPERATING

MANUAL.

PROBABLE DEFECTIVE
A6 BOARD

PROBABLE DEFECTIVE
A10 BOARD

CHECK CURRENT READING

ON FRONT PANEL DISPLAY

PROBABLE DEFECTIVE
A10 BOARD

CHECK CURRRENT
CALIBRATION

CHECK FOR SHORT
CIRCUIT IN OUTPUT

READS 1/2 F.S.

CURRENT?

40 = -5V ?

CHECK CC PROGRAM LEVEL

AT A10U514-6 40

YES

DISPLAY

Figure 3-5. Output Held Low Troubleshooting)

Summary of Contents for 669 A Series

Page 1: ...i c i a n sw i t ho v e r 1 5 0y e a r so f s p e c i a l i z a t i o n 9 0d a yw a r r a n t y 5d a yr i g h t o f r e t u r no na l l e q u i p me n t 1 3y e a r w a r r a n t i e sf o r n e wa n d p r e mi u m r e f u r b i s h e de q u i p me n t E v e r yu n i t t e s t e dt oO E Ms p e c i f i c a t i o n s S a t i s f a c t i o ng u a r a n t e e d Y o uh a v ep l a n s w ew i l l h e l py ...

Page 2: ...Service Manual Keysight Series 669xA GPIB DC Power Supplies ...

Page 3: ......

Page 4: ...instruments with Serial Numbers Keysight 6690A MY41000131 Keysight 6691A MY41000119 Keysight 6692A MY41000133 For manual updates a change page may be included For a history of manual updates see Appendix A Keysight Part No 5969 2907 Printed in Malaysia December 2014 ...

Page 5: ...s returned to Customer from another country Keysight Technologies shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Keysight Technologies product price only if Customer pays Keysight Technologies international prices defined as destination local currency price or U S or Geneva Export price If Keysight Technologies is unable withi...

Page 6: ...al blow time delay etc should be used Do not use repaired fuses or short circuited fuseholders To do so could cause a shock or fire hazard Do not operate this instrument in the presence of flammable gases or fumes Do not install substitute parts or perform any unauthorized modification to this instrument Some procedures described in this manual are performed with power supplied to the instrument w...

Page 7: ...he unit from ac mains either disconnect the power cord or have a qualified electrician install an external switch Printing History The edition and current revision of this manual is 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 correcte...

Page 8: ...nt Current CC Tests 15 Averaging the CC Measurements 19 Troubleshooting 25 Introduction 25 Test Equipment Required 25 Power On Selftest 26 Troubleshooting Charts 26 Firmware Revisions 42 Test Headers 42 Post Repair Calibration 43 When Required 43 Inhibit Calibration Jumper 43 Calibration Password 43 Restoring Factory Calibration Constants 44 EEPROM Initialization 44 Transferring Calibration Consta...

Page 9: ...is Components 52 Principles of Operation 59 Introduction 59 A2 GPIB Board 59 A1 Front Panel Assembly 60 A10 Control Board 60 A4 AC Input Board 62 A5 DC Rail Board 63 A3 FET Board 63 Output Circuits 64 Replaceable Parts 65 Introduction 65 How to Order Parts 65 Diagrams 69 Introduction 69 Backdating 99 Index 101 ...

Page 10: ...ent Item Description MY The first two letters indicates the country of manufacture where US USA MY Malaysia 3648 This is a code that identifies either the date of manufacture or the date of a significant design change 0101 The last four digits are a unique number assigned to each power supply Manual Revisions The edition and current revision of this manual is indicated on page 4 Reprints of this m...

Page 11: ... line voltage Calibration procedure front panel and remote Safety Considerations This power supply is a Safety Class I instrument which means it has a protective earth terminal This terminal must be connected to earth ground through a power source equipped with a 4 wire ground receptacle Refer to the Safety Summary page at the beginning of this manual for general safety information Before operatio...

Page 12: ... to Chapter 3 Test Equipment Required Equipment List Table 2 1 lists the equipment required to perform the tests given in this chapter Only the equipment marked with the superscript 1 is needed for the Operation Verification test Current Monitoring Resistor The four terminal current monitoring resistor current shunt listed in Table 2 1 is required to eliminate output current measurement error caus...

Page 13: ...oltage Transformer AC Source Power 3 Phase 24KVA Range 180 235V 47 63Hz 360 440V 47 63Hz Superior Powerstat 1156DT 3Y 0 280V 50A 24 2 KVA or equivalent GPIB Controller2 Full GPIB capabilities HP Series 200 300 1 Required for Operation Verification Tests 2 Required for remote testing of 669xA models Programming the Tests General Considerations Procedures are given for programming these tests either...

Page 14: ...lied 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 Each sheet lists the acceptable test ranges for the model and provides a place to record the results of the test Note It is recommended that before you perform the tests in either Table 2 4 or Table 2...

Page 15: ...able 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 a CV Test Setup with 6 6kW Electronic Load S S DVM Electronic Load b CV Test Setup with 6 6kW Load Resistor S S DVM Note Start with switch closed take full load reading open switch and take no load...

Page 16: ... load to no load 1 Turn off the power supply and connect a DVM across S and S see Fig 2 1 2 Turn on the power supply and program the current to its maximum programmable value and the voltage to its full scale value see Table 2 2 3 Adjust the load to produce full scale current see Table 2 2 as shown on the front panel display CV annunciator is on If it is not adjust the load to slightly reduce the ...

Page 17: ...s the and output terminals see Fig 2 1 Set the oscilloscope bandwidth limit to 20MHz 30MHz for the Keysight 54504A and use an RF tip on the oscilloscope probe 2 Turn on the power supply and program the current to its maximum programmable value and the voltage to its full scale value see Table 2 2 3 Adjust the load to produce full scale current see Table 2 2 as shown on the front panel display CV a...

Page 18: ...Measure both the loading and unloading transients by triggering the oscilloscope on both the negative and positive slopes of the transient Record the voltage level obtained at the 900 s interval Specified voltage level is reached within 900 s Figure 2 2 Transient Response Waveform Constant Current CC Tests Test Setup Connect the appropriate current monitoring resistor see Table 2 l as shown in Fig...

Page 19: ...lation Test allows UUT to operate at 0 v olts and electronic load to operate at its minimum input v oltage specif ication Voltage source must alway s be in CV mode UUT must be in CC mode f or all CC tests b CC Test Setup with 6 6kW Load Resistor Note Start with switch closed take reading at 0 output v oltage Open switch and take f ull load reading UUT must be in CC mode f or all CC tests Figure 2 ...

Page 20: ... 3 volt input required by the Keysight N3306A electronic loads The series DC source must be capable of 3VDC at a current level that is greater than the output current of the supply being tested A switch can be used in place of the series supply if the electronic loads are used in place of a load resistor as shown in Fig 2 3 b 1 Turn off the power supply and connect a DVM across the current monitor...

Page 21: ...ectronic Load to CV mode and its voltage to full scale 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 5 Adjust the transformer to decrease the ac input voltage to the low line condition 180Vac or 360Vac 6 Observe the DVM reading Divide this voltage by the resistance of the current monitori...

Page 22: ...ng steps show how to set up the voltmeter from its front panel to take a statistical average of l00 readings represents the unlabeled shift key in the FUNCTION RANGE group 1 Program 10 power line cycles per sample by pressing 2 Program 100 samples per trigger by pressing 3 Set up voltmeter to take measurements in the statistical mode as follows a Press b Press until MATH function is selected then ...

Page 23: ..._________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ _______________________________________________________________...

Page 24: ...V 15 021V Vout 30mV Load Effect Vout 0 95mV _______mV Vout 0 95mV Source Effect Vout 0 95mV _______mV Vout 0 95mV PARD Ripple and Noise Peak to Peak RMS 0 0 _______mV _______mV 15mV 2 5 mV Transient Response Time at 900 s 0 _______mV 150mV Constant Current Tests Current Programming and Readback Low Current 0A Iout Front Panel Display Readback 230mA Iout 300mA _______mA _______mA 230mA Iout 300mA H...

Page 25: ...V 30 042V Vout 60mV Load Effect Vout 1 7mV _______mV Vout 1 7mV Source Effect Vout 1 25mV _______mV Vout 1 25mV PARD Ripple and Noise Peak to Peak RMS 0 0 _______mV _______mV 25mV 2 5mV Transient Response Time at 900 s 0 _______mV 150mV Constant Current Tests Current Programming and Readback Low Current 0A Iout Front Panel Display Readback 125mA Iout 165mA _______mA _______mA 125mA Iout 165mA High...

Page 26: ...60 084V Vout 120mV Load Effect Vout 3 4mV _______mV Vout 3 4mV Source Effect Vout 1 85mV _______mV Vout 1 85mV PARD Ripple and Noise Peak to Peak RMS 0 0 _______mV _______mV 25mV 2 5mV Transient Response Time at 900 s 0 _______mV 150mV Constant Current Tests Current Programming and Readback Low Current 0A Iout Front Panel Display Readback 65mA Iout 80mA _______mA _______mA 65mA Iout 80mA High Curr...

Page 27: ......

Page 28: ...lly 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 An explanation of the error codes and messages generated during the power on selftest A series of flow charts for systematic location of defective boards circuits and components Post Repair Adjustments...

Page 29: ... on the front panel and the power supply will attempt to continue normal operation 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 Some results of Figure 3 1 lead to more detailed troubleshooting charts that guide you to specific components Many of the fol...

Page 30: ...back test failed power on and TST A10 board probably defective or A6 bias board defective E11 TEMP Ambient temperature readback test failed power on and TST A10 board probably defective E12 DACS CV or CC DAC tests failed power on A10 board probably defective or A6 bias board defective see Figure 3 7 NOTE The following error messages can appear because of a failure while the unit is operating or du...

Page 31: ...SWITCH A1S1 IS FAN RUNNING GO TO NO DISPLAY TROUBLESHOOTING FIG 3 2 IS DISPLAY ON ERROR MESSAGE DISPLAYED SEE SELF TEST ERROR CODES TABLE 3 2 WITH FRONT PANEL KEYS PROGRAM FULL SCALE VOLTAGE AND CURRENT SEE TABLE 2 2 USE DVM TO MEASURE VOLTAGE AT OUTPUT TERMINALS OUTPUT VOLTAGE WITHIN SPEC VOLTAGE RIGHT BUT OUT OF SPEC CALIBRATE THE SUPPLY NO YES YES NO YES NO YES NO YES A GO TO SHEET 2 GO TO SHEE...

Page 32: ...E SPECS CALIBRATE SUPPLY C GO TO SHEET 4 READS OK BUT OUTSIDE SPECS CALIBRATE SUPPLY OUTPUT CURRENT WITHIN SPECS CURRENT DISPLAY WITH IN SPECS IS CC ANNUNCIATOR ON OV CONDITION OCCURRED TURN OFF SUPPLY AND REMOVE SHUNT TURN ON SUPPLY AND PROGRAM VOLTAGE AND CUR RENT TO FULL SCALE PROGRAM OV TO 1 2 FS VOLTAGE CHECK THAT SUPPLY GOES INTO AN OV CONDITION PROT ON AND OUTPUT 0 GO TO OV WILL NOT FIRE TR...

Page 33: ...OPERATION OF DIGITAL CONTROL PORT SERIAL LINK AND THE FRONT PANEL V I ROTARY CONTROLS DIGITAL CONTROL PORT OK SERIAL LINK OK FRONT PANEL CONTROLS OK NO PROBLEMS FOUND PERFORM VERIFICATION TESTS IN CHAPTER 2 TO ISOLATE PROBLEM GO TO SLOW DOWN PROGRAMMING TROUBLESHOOTING SEE FIG 3 12 PROBABLE DEFECTIVE A2 BOARD PROBABLE DEFECTIVE A2 BOARD PROBABLE DEFECTIVE A2 BOARD CHECK VOLTAGE RPG A1G1 AND OR CUR...

Page 34: ...NO YES GO TO OV AT TURN ON TROUBLESHOOTING FIG 3 4 DISPLAYED OC YES NO NO CHECK IF OCP IS ENABLED AT TURN ON AND CURRENT IS PROGRAMMED TO ZERO OR OUTPUT SHORTED RI REMOTE INHIBIT DISPLAYED CHECK FOR SHORT BETWEEN A2TB101 3 AND GROUND C FROM SHEET 2 GO TO OUTPUT HELD LOW TROUBLESHOOTING FIG 3 5 VOLT AGE RIGHT BUT OUTSIDE SPEC YES PROBABLE DEFECTIVE A10 BOARD NO NO Figure 3 1 Overall Troubleshooting...

Page 35: ... FRONT PANEL SUPPLY OPERATES PROPERLY CHECK TEST POINTS 1 4 SEE TABLE 6 3 CHECK CABLE W4 TURN OFF THE SUPPLY IN ORDER TO ACCESS A1 FRONT PANEL BOARD REMOVE A1 FRONT PANEL ASSEMBLY TURN ON SUPPLY CHECK 5V BIAS AT R1 6 CONNECT METER COMMON TO R1 3 CHECK THE FOLLOWING DISPLAY VOLTAGES 1 1V AT R1 14 2 2V AT R1 2 DISPLAY BIAS VOLTAGES OK CHECK 12 MHz CLOCK SIGNAL AT A1U3 66 IS 12MHz SIGNAL OK CONNECT E...

Page 36: ...AM THE OUTPUT VOLTAGE AND CURRENT TO 1 2 SCALE PROGRAM THE OV TO ZERO PROBABLE DEFECTIVE A10 BOARD NEGATIVE LOW THROUGH 22 SEE TABLE 6 3 INSURE THAT OUTPUT VOLTAGE IS AS PROGRAMMED AND THE OVER VOLTAGE CONDITION IS NOT DETECTED OV ANNUNCIATOR IS OFF 63 WITH RESPECT TO COMMON 36 See TABLE 6 3 NOTE U502 14 PULSES ARE LOW WHEN OV FIRES APPROXIMATELY 1 MILLISEC LOW WHEN OV FIRES 5 V 0 V PROBABLE DEFEC...

Page 37: ...SABLE THE OV INPUT BY LIFTING A10R536 TURN ON SUPPLY AND CHECK IS OUTPUT HIGH GO TO OUTPUT HELD HIGH TROUBLESHOOTING FIG 3 6 NO YES OV STILL OCCURS PROBABLE DEFECTIVE A10 BOARD CHECK VOLTGES AT A10U521 7 84 A10U502 12 70 AND A10U502 14 63 YES NO DOES A10U521 7 5 4 0 5 V YES NO IS A10U502 12 0 5V YES NO IS A10U502 14 HIGH WARNING DURING THESE TESTS THE OUTPUT MAY BE AT HAZARDOUS LEVELS CHECK THAT A...

Page 38: ...NUNCIATOR ON USE DIFFERENTIAL INPUT OSCILLOSCOPE TO CHECK FOR PULSES AT A10J511 62 A10U602 9 52 A10U600 10 56 A10U607 1 51 A10U604 8 59 AND A10U605 7 55 SEE CORRECT WAVEFORMS IN FIG 6 1 IS TP 62 OK 15V 40KHz NO YES SEE FET TROUBLE SHOOTING FIG 3 11 CHECK CV PROGRAMMING LEVEL AT A10U513 6 39 DOES TP 56 5V YES NO CHECK VOLTAGE CALIBRATION SEE APPENDIX A IN OPERATING MANUAL PROBABLE DEFECTIVE A6 BOAR...

Page 39: ...ISABLE THE OV CIRCUIT BY LIFTING A10R536 TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO ZERO CHECK IF CV OR GATE DIODE A10D652 IS CONDUCTING A10D652 CONDUCTING NO YES CHECK VOLTAGE LEVEL AT FAST SENSE DIFF AMP A10U608 7 49 DOES TP 49 10V NO YES PROBABLE DEFECTIVE A6 BOARD PROBABLE DEFECTIVE A10 BOARD PROBABLE DEFECTIVE A10 BOARD PROBABLE DEFECTIVE A10 BOARD OR A8 FAST SENSE BOARD Figure ...

Page 40: ...CONDS THEN REMOVE SHORT WAIT FOR POWER ON INIT TO COMPLETE USE A SCOPE TO CHECK THE CV DAC A10U513 6 CC DAC A10U514 6 AND READBACK DAC A10U515 6 OUTPUTS COMPARE THE WAVEFORMS GIVEN IN FIG 6 1 IS ONE DAC MISSING STEPS ARE ALL DACS MISSING STEPS IS CV OR CC DAC DEFECTIVE NO YES CHECK REF VOLTAGE FOR CV CC DACS AT A10U504 6 37 WITH RESPECT TO 36 DOES A10U504 6 10V THE WAVEFORMS TAKEN AT THESE POINTS ...

Page 41: ...THIS CONFIGURATION IS FOR TEST ONLY DO NOT FLOAT THE OUTPUT OR ATTEMPT TO OPERATE OPERATE THE SUPPLY IN THIS CONFIGURATION TURN OFF SUPPLY REMOVE FRONT PANEL ASSEMBLY TO ACCESS THE A1 FRONT PANEL BOARD TURN ON SUPPLY AND CHECK FOR PULSES AT A1U3 17 AND A1U3 18 PULSES AT A1U3 17 CHECK CABLE W5 PULSES AT A1U3 18 YES NO YES NO TURN ON THE SUPPLY AND TRY TO PROGRAM IT FROM THE PROBABLE DEFECTIVE A2 BO...

Page 42: ...OMMON A2U110 5 12 5V AT A2U110 8 CHECK FOR SERIAL DATA PULSES AT THE A10 CONTROL BOARD CIRCUIT POINTS AS INDICATED BELOW WITH RESPECT TO SECONDARY COMMON 12 PULSES AT A10U506 10 PROBABLE DEFECTIVE A2 BOARD CHECK CABLE W4 CHECK SECONDARY BIAS CIRCUIT TEST POINTS 20 21 AND 22 SEE TABLE 6 3 CHECK FOR CABLE W4 OPEN NO YES NO YES NO YES PROBABLE DEFECTIVE A2 BOARD PULSES AT A10U504 11 AND NO YES PROBAB...

Page 43: ...0U610 1 WITH RESPECT TO SECONDARY COMMON 36 SEE TABLE 6 3 A10U610 1 2 5V A10U609 1 10V PROBABLE DEFECTIVE A10 BOARD NO YES NO YES CHECK FUSES A9F980 F981 BY MEASURING CONTINUITY SHOULD TOGGLE BETWEEN 1 V WITH OUTPUT OFF AND APPROX 11 V WITH OUTPUT ON NOTE PROBABLE DEFECTIVE A10 BOARD PROBABLE DEFECTIVE A9 BOARD Figure 3 10 Slow Downprogramming Troubleshooting ...

Page 44: ...301 20 Mohm 15 Kohms CONTINUE WITH DYNAMIC YES YES YES NO NO NO SEE DISASSEMBLY PROCEDURES PROBABLE DEFECTIVE A3 BOARD MEASURE RESISTANCE BETWEEN THE GATE OF EACH FET AND COMMON RAIL MEASURE RESISTANCE ACROSS CAPACITOR C201 AND C301 approx 150 ohms YES NO MEASURE RESISTANCE ACROSS 15V BIAS INPUT 1k ohm forward 490 ohm reverse TROUBLESHOOTING IN TABLE 6 3 NOTE BECAUSE TEST POINTS ON THE A3 FET BOAR...

Page 45: ...henever the firmware is updated Test Headers The power supply has two test headers as shown in Figure 3 12 each with a jumper that can be moved to different positions for various functions To gain access to the headers remove the power supply top cover Pins Description Primary Interface Test Connector A2J106 7 and 8 FLT INH Normal operating and storage position DIG CNTL port is configured for faul...

Page 46: ...umper 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 Passwor...

Page 47: ...n 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 ...

Page 48: ... 260 DATA 175 74 15 375 0 83 0 15 73 450 0 270 DATA 98 21 8 7 10 18 0 0 83 255 20 10 280 DATA 6690 162 96 15 96 128 5 255 0 0 290 DATA 1296 6690 0 20 180 20 180 175 33 98 300 DATA 115 30 20 1 127 002701 2 000307 10 25 310 320 Eprom_data_6691 EPROM data for 6691A 330 DATA 116 74 30 75 0 83 0 23 75 225 0 340 DATA 98 21 5 5 10 36 0 0 83 255 20 10 350 DATA 6691 108 96 23 97 128 5 255 0 0 360 DATA 1296...

Page 49: ...0 OUTPUT Ps CAL STATE ON Turn on cal mode 0 passcode 820 830 GOSUB Ps_error Error if passcode is not 0 840 IF Err THEN 850 OUTPUT Ps IDN Get data from model location 860 ENTER Ps Idn 870 Model VAL Idn POS Idn 1 880 ELSE 890 GOTO Start 900 END IF 910 920 OUTPUT Ps CAL STATE ON Model Turn on cal mode passcode 930 data at model number location 940 950 GOSUB Ps_error Error if passcode is not same as 9...

Page 50: ... the alignment of voltage overvoltage 1360 PRINT and current is complete AND unit has passed the performance 1370 PRINT test Enter C to continue any other key to abort 1380 INPUT Cont_prog 1390 IF UPC Cont_prog C THEN GOTO Cal_off 1400 1410 CLEAR SCREEN 1420 PRINT Transferring calibration data to factory preset locations 1430 1440 Fact_cal_sour Address of factory calibration data source 1450 DATA ...

Page 51: ...or handling subroutine 1910 OUTPUT Ps SYST ERR Check for errors 1920 ENTER Ps Err 1930 RETURN 1940 1950 END Figure 3 13 Initialization and Factory Preset Replacement Program Listing Sheet 4 of 4 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 ca...

Page 52: ...e chassis mounted components You must remove this shield in order to gain access to the inside of the power supply Remove the shield as follows 1 There are approximately 21 screws holding the cover to the frame 2 There are two screws at the top of the shield that secure a retaining clip for the GPIB board You do not need to remove these screws simply loosen the screws and slide the GPIB retaining ...

Page 53: ...oceed to remove unsolder any other wires cables as necessary to remove the A6 BIAS Board entirely Note It is recommended that you label any connectors you disconnect from the A6 BIAS Board to facilitate the reinstallation of these cables wires to their correct locations later If you have trouble later in determining which cable goes to which connector during reinstallation refer to the cabling dia...

Page 54: ...t 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 b...

Page 55: ...e can exist inside the power supply even after it has been turned off Check the INPUT RAIL LED A4CR402 under the RFI shield see Figure 3 14 for LED location It the LED is on there is still hazardous voltage inside the supply Wait until the LED goes off approximately 7 minutes after power is removed before proceeding 3O Line Choke Keypad T900 top T901 bottom A2 GPIB Assy RFI Filter underneath A4 A4...

Page 56: ...Troubleshooting 53 Figure 3 15 3 Inch Front Panel Frame Assembly ...

Page 57: ...54 Troubleshooting Figure 3 16 Assembly A10 Exploded View ...

Page 58: ...Troubleshooting 55 Figure 3 17 Assembly A10 Exploded View 6690A ...

Page 59: ...56 Troubleshooting Figure 3 18 Assembly A10 Exploded View 6691A 6692A ...

Page 60: ...Troubleshooting 57 Figure 3 19 Three Phase Line Choke Subchassis Wiring ...

Page 61: ...58 Troubleshooting Figure 3 20 24 Volt Fan Transformer ...

Page 62: ...d by the GPIB interface and primary microprocessor circuits on the A2 board The primary microprocessor circuits microprocessor U114 ROM U106 and RAM U108 decode and execute all instructions and control all data transfers between the GPIB controller and the Secondary Interface on the A10 Control Board The primary microprocessor also processes measurement and status data received from the Secondary ...

Page 63: ...ad 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 A10 Control Board The front panel microprocessor circuits also process power supply measurement and status data received from the serial I O port This data is displayed on the LCD IC EEPROM U6 electrically erasabl...

Page 64: ...ure AMB_SENSE The programmed voltage value CVPROG The programmed current value CCPROG The fan detector FAN_DEW The readback DAC circuit is controlled by the P to successively approximate to 12 bit resolution the value of each signal monitored The CVPROG and CCPROG signals are used during selftest to check DAC OpAmp operation The P monitors the fan speed and ambient temperature and generates the FA...

Page 65: ...ol P O A10 These circuits include a Ramp Generator Divider Deadtime Latch Fast Sense Differential Amplifier Pulse Width Modulator Summing Comparator Down Programmer Control and OV Comparator circuits The Divider Deadtime Latch U600 U601 U602 divides the 2 MHz ALE_CK signal from the Secondary P and supplies 40 KHz pulses to the Ramp Generator U607 and ON Latch U604 The OR GATE signal CV or CC contr...

Page 66: ...ected between the rail and rail voltages and connected across the FET stages is a chassis mounted power transformer The entire circuit represents an H bridge configuration A complete stage consists of eight power FETs and two bridge driver ICs The power FETs are mounted on but isolated from the heat sink assembly The two power FET stages are isolated from each other The DRIVElA lB and DRIVE2A 2B p...

Page 67: ...plied to the output filter The output filter assembly consists of bus bars with the filter capacitors bolted to them The filter chokes L902 through L906 consist of ferrite cores enclosing the bus bar The current sense resistor R900 is part of the positive output bus bar RFI FILTER LOWER 1 2 3 AC INPUT BOARD DC RAIL BOARD RAIL RAIL FET BOARD P O SNUBBER BOARD P O SNUBBER BOARD FAST SENSE SLOW SENSE...

Page 68: ...nual When ordering a part please include the following information the Keysight part number the part description the desired quantity the model number of the power supply for example Keysight 6692A Table 5 1 Main Chassis Replaceable Parts Ref Desig Keysight Part No Description ASSEMBLIES SUBASSEMBLIES 5060 3553 TESTED FRONT FRAME ASSEMBLY A1 5060 3542 TESTED KEYBOARD PC ASSEMBLY A2 5063 4851 TESTE...

Page 69: ...70 1571 CORE R900 6690A 5080 2297 SHUNT CURRENT 6691A 06682 80002 SHUNT CURRENT 6692A 5080 2324 SHUNT CURRENT T900 901 6690A 9100 6062 POWER TRANSFORMER 6691A 9100 6063 POWER TRANSFORMER 6692A 9100 6064 POWER TRANSFORMER 9100 6065 24V BIAS TRANSFORMER 3160 4116 FAN TUBEAXIAL 2110 1077 FUSE 20A 690V 3 required for 400VAC 2110 1078 FUSE 40A 690V 3 required for 208VAC 5065 6934 FUSE KIT FOR 208VAC co...

Page 70: ...TRAP HANDLE 5041 8820 CAP STRAP HANDLE 5062 3705 STRAP HANDLE 5080 2545 CARTON shipping container 5080 2418 TRAY shipping container 5080 2414 SKID shipping container 5080 2415 FOAM PAD shipping container 5964 8269 MANUAL OPERATING Table 5 2 Front Panel Assembly Replaceable Parts Ref Desig Keysight Part No Description A1 5060 3542 A1 KEYPAD PC BOARD tested 0370 3238 KNOB Ref G1 G2 0515 2535 SCREW R...

Page 71: ...OR J436 437 438 439 1251 3837 CONNECTOR J440 1252 0055 CONNECTOR J441 1252 0056 CONNECTOR 5080 2286 CABLE BIAS 24V E440 E443 to BIAS J816 5080 2289 CABLE AC BIAS E430 E434 to AC INPUT J419 5080 2293 CABLE LINE SELECT E444 E447 to J436 J437 5080 2294 CABLE LINE SELECT E448 E451 to J438 J439 Table 5 7 A6 Bias Assembly Replaceable Parts Ref Desig Keysight Part No Description F800 2110 0712 FUSE SUBMI...

Page 72: ...monics Table 6 2 Test points Description of each test point The location of each test point is shown on the appropriate schematic and its associated parts location drawing Table 6 3 Schematic notes A list of general notes that are applicable to all schematic diagrams Notes that apply to a specific schematics appear on the schematic sheet Table 6 4 Waveforms Test point waveforms for Table 6 3 Figur...

Page 73: ... FET drive signals REF_PWM Reference pulse width modulator EOI End or identify GPIB REN Remote enable FAC_CAL Factory calibration RI Remote inhibit FAN_PWM Fan pulse width modulation ROM Read only memory FPRX Front panel receive serial data SPCLR Secondary power clear FPTX Front panel transmit serial data RX Receive serial data FS Fast sense RxD Receive Serial Data HSRQ GPIB service request SA Sig...

Page 74: ...board is installed troubleshooting must be performed with the board removed from the power supply refer to the disassembly procedures at the back of chapter 3 1 Turn off the power supply and remove the A3 FET Board with its heat sink assembly 2 Short the collectors of Q251 and Q253 or Q351 and Q353 by connecting the collector case of each transistor to common E507 3 Connect waveform generator to J...

Page 75: ...eet 4 CV mode 0V CC mode 0 4V U620 7 2ND I AMP output Sheet 4 CV mode 0V CC mode 4 5V U620 1 CC CONTROL Sheet 4 CV mode 10V CC mode 0 4V U502 3 CC Sheet 4 CV mode 5V CC mode 0V U608 7 FAST SENSE AMP Sheet 3 CV mode 4V CC mode 0V U607 7 RAMP GEN Sheet 3 See Figure 6 1 U607 1 RAMP GEN Sheet 3 See Figure 6 1 U602 9 DIVIDER output Sheet 3 See Figure 6 1 U605 3 SUMMING POINT Sheet 3 See Figure 6 1 U602...

Page 76: ...H 2 8C SH 2 8C indicates the sheet number and the coordinates on that sheet where the CVPROG signal line goes 5 Unterminated signal lines go to a least one other location on the same sheet 6 Unless otherwise noted bias connections to integrated circuit packages are as follows Common 5V 14 pin packages pin 7 pin 14 16 pin packages pin 8 pin 16 20 pin packages pin 10 pin 20 5 00 V div 10 us div TEST...

Page 77: ...74 Diagrams Figure 6 1 Test Point Waveforms for Table 6 3 sheet 2 of 2 ...

Page 78: ...J433 5080 2290 24V BIAS XFMR FRONT PANEL S1 FET E208 E201 J223 J224 J226 E202 E301 E302 J225 E206 E207 E306 E307 E209 CONTROL J511 J509 J507 J510 J512 J831 J830 J809 A2 GPIB J108 5080 2168 FAN 5182 9185 5080 2280 5080 2283 5080 FRONT PANEL SLOW SENSE FAST SENSE 5080 2316 5080 2287 DOWNPROGRAM 5080 2168 J6 POWER XFMR POWER XFMR RECT RECT RECT RECT A7 SNUBBER 5060 3327 5060 3327 J107 P101 W4 W5 5080...

Page 79: ...Figure 6 3 A1 Front Panel Board Assembly Diagram ...

Page 80: ...Figure 6 4 A1 Front Panel Board Schematic Diagram Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 81: ...Figure 6 5 A2 GPIB Board Component Location ...

Page 82: ...2 3 4 1 6 5 7 8 Figure 6 6 A2 GPIB Board Schematic Diagram Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 83: ...Figure 6 7 A3 FET Board Component and Test Point Location ...

Page 84: ...Figure 6 8 A3 FET Board Schematic Diagram sheet 1 of 2 Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 85: ...Figure 6 8 A3 FET Board Schematic Diagram sheet 2 of 2 Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 86: ...F 1 4W 0683 4755 5 4 7M 900 0160 7606 20 275V PM 1UF CHASSIS 9140 2548 CHASSIS 0590 2027 12_AWG_AMPIN 12_AWG_AMPIN 12_AWG_AMPIN 12_AWG_AMPIN SINGLE PHASE INPUT TO AC INPUT RAIL E401 GRA TO AC INPUT E402 WHT GRA BRN TO AC INPUT E400 WHT GRA RED BLK WHT RED PHASE 2 PHASE 1 PHASE 3 PHASE 1 PHASE 2 PHASE 3 E1942 E19415 E19413 E19411 1 MP2 5 6 1 3 2 4 L1 C4 R1 C1 C7 C8 R2 C5 C9 R3 C6 C2 C3 E19133 E1913...

Page 87: ...Figure 6 11 A4 AC Input Board Component and Test Point Location 12 9 10 11 ...

Page 88: ...IAS PCB WHT RED GRA GRA WHT BRN GRA TO J19133 TO J19132 TO J1942 5 11 8 2 RANGE 1 RANGE 2 PHASE X LINE CHOKE CONNECTION DETAIL PHASE Y PHASE Z 1 4 7 10 3 6 9 12 CONNECTOR FROM BIAS PCB RANGE 1 NOTE IF RANGE 1 IS SELECTED BY CHOKE PLUG PIN NUMBERS REFER TO J417 IF RANGE 2 IS SELECTED BY CHOKE PLUG PIN NUMBERS REFER TO J418 SEE LINE CHOKE CONNECTION DETAIL Z Y X RED BRN ORN 7 8 9 10 1 2 5 6 4 3 K401...

Page 89: ...Figure 6 13 A5 DC Rail Board Component and Test Point Location 13 14 ...

Page 90: ...E 2 DC RAIL 1 DC RAIL 2 ASSY 5064 0070 COIL 5080 2263 SLUG 9170 1575 RANGE 2 E448 CONNECTS TO J438 2 J439 2 E449 CONNECTS TO J438 3 J439 3 E450 CONNECTS TO J438 1 J439 1 E444 CONNECTS TO J436 3 J437 3 E445 CONNECTS TO J436 4 J437 4 E446 CONNECTS TO J436 1 J437 1 E447 CONNECTS TO J436 2 J437 2 E451 CONNECTS TO J438 4 J439 4 RANGE 1 NOTE 669X SERIES 668X SERIES 2110 0921 0 5A 2110 1066 1A 2110 1107 ...

Page 91: ...Figure 6 15 A6 Bias Board Component and Test Point Location 15 16 17 18 19 19 20 22 ...

Page 92: ... ard Schematic Diagram Sheet 1of 2 668xA 669xA Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models Figure 6 16 A6 Bias Bo ...

Page 93: ...e 6 16 A6 Bias Board Schematic Diagram Sheet 2 of 2 17 18 16 15 Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 94: ...Figure 6 17 Power Mesh Schematic Diagram All Models ...

Page 95: ...ation and Schematic Diagram Figure 6 19 A8 Fast Sense Board Component Location and Schematic Diagram Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 96: ...A9 Down Programming Slow Sense Component Location and Schematic Diagram Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 97: ...Figure 6 21 A10 Control Board Component and Test Point Location 47 55 44 41 42 46 48 43 63 53 51 50 49 45 38 36 60 62 61 59 54 52 57 58 56 64 37 21 36 22 20 39 40 ...

Page 98: ... A10 Control Board Schematic Diagram Sheet 1 of 4 21 22 20 36 37 38 63 Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 99: ...e 6 22 A10 Control Board Schematic Diagram Sheet 2 of 4 64 40 39 Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 100: ...oard Schematic Diagram Sheet 3 of 4 56 61 60 58 57 59 54 52 53 50 51 49 62 55 65 66 Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 101: ...Control Board Schematic Diagram Sheet 4 of 4 48 43 47 42 41 39 46 45 44 40 Schematic sheets are not intended for component level troubleshooting Component values and ratings may not match the values used on all models ...

Page 102: ...er supply is prior to any of the serial number s listed perform the change indicated in the Change column Note that several changes can apply to your supply Serial Numbers Change Model 6690A MY41000131 1 Model 6691A MY41000119 1 Model 6692A MY41000133 1 Change 1 In Table 5 1 Main Chassis DELETE ADD CHANGE CABLE PN 5185 1343 LED BOARD P N 5060 3483 CABLE P N 5080 2281 CABLE P N 5080 2283 CABLE P N ...

Page 103: ......

Page 104: ... 27 E5 PRI IRAM 27 E6 PRI ROM 27 E7 GPIB 27 E8 SEC RAM 27 E9 SEC ROM 27 EE WRITE ERR 27 EEPROM initialization 44 electrostatic discharge precautions 8 error messages E1 FP RAM 27 E10 SEC 5V 27 E11 TEMP 27 E12 DACS 27 E2 FP ROM 27 E3 EE CHKSM 27 E4 PRI XRAM 27 E5 PRI IRAM 27 E6 PRI ROM 27 E7 GPIB 27 E8 SEC RAM 27 E9 SEC ROM 27 EE WRITE ERR 27 SBUF FULL 27 SECONDARY DN 27 SERIAL DOWN 27 SERIAL TIMOU...

Page 105: ... notes 73 power mesh 91 RFI board 83 snubber board 92 SECONDARY DN 27 selftest error messages 27 SERIAL DOWN 27 serial number 7 SERIAL TIMOUT 27 signal names 70 SUBF OVERRUN 27 T test equipment troubleshooting 25 test header 42 test points 70 waveforms 73 test record form 6690A 21 6691A 22 6692A 23 tests constant current 15 constant voltage 12 equipment required 10 performance 9 11 selftest 26 ver...

Page 106: ...Backdating 103 This information is subject to change without notice Keysight Technologies 2002 2014 Edition 2 December 2014 5969 2907 www keysight com ...

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