SERVICE MANUAL GPIB DC Power Supplies Agilent Series 669xA For instruments with Serial Numbers: Agilent 6690A: MY41000131 Agilent 6691A: MY41000119 Agilent 6692A: MY41000133 For manual updates, a change page may be included. For a history of manual updates, see Appendix A. Agilent Part No.
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.
SAFETY CONSIDERATIONS GENERAL. This is a Safety Class 1 instrument (provided with terminal for connection to protective earth ground). OPERATION. BEFORE APPLYING POWER verify that the product is set to match the available line voltage, the correct line fuse is installed, and all safety precautions (see following warnings) are taken. In addition, note the instrument's external markings described under "Safety Symbols". WARNING. • Servicing instructions are for use by service-trained personnel.
Safety Symbol Definitions Symbol Description Symbol Description Direct current Terminal for Line conductor on permanently installed equipment Alternating current Caution, risk of electric shock Both direct and alternating current Caution, hot surface Three-phase alternating current Caution (refer to accompanying documents) Earth (ground) terminal In position of a bi-stable push control Protective earth (ground) terminal (Intended for connection to external protective conductor.
Table of Contents Introduction ............................................................................................................................................................................ 7 Scope and Organization ...................................................................................................................................................... 7 Instrument Identification.........................................................................................................
A1DSP1 LCD Display ................................................................................................................................................... 51 A1G1 and A1G2 Rotary Controls .................................................................................................................................. 51 A1KPD Keypad .............................................................................................................................................................
1 Introduction Scope and Organization This manual contains information for troubleshooting and repairing Agilent Series 669xA, 6.6-kilowatt power supplies to the assembly level. The supplied schematics at the back of the manual are not intended for component level repair, only to provide additional information for isolating a problem to a specific assembly.
Firmware Revisions The power supply's firmware resides in the A10 control board microprocessor chip and in ROM chips on the A2 GPIB and A1 Front Panel boards. You can obtain the firmware revision number by either reading the integrated circuit label, or query the power supply using the GPIB *IDN query command (see Chapter 3 - Troubleshooting). Also, see Chapter 3, Firmware Revisions for the actual Agilent BASIC program that does this.
2 Verification Introduction This chapter provides test procedures for checking the operation of Agilent Series 669xA power supplies. The required test equipment is specified and sample performance test record sheets are included. Instructions are given for performing the tests either from the front panel or from a controller over the GPIB. Tests Two types of procedures are provided: Operation Verification tests and Performance tests.
Table 2-1. Test Equipment Required Required Characteristics Recommended Model Type Digital Voltmeter1 Current Monitor Resistor1 DC Power Supply Electronic Load Resistor Load Oscilloscope RMS Voltmeter Resolution: 10 nV @ 1V Readout: 8 1/2 digits Accuracy: 20 ppm Agilent 6691A, 6692A: 0.001Ω ± 0.04%, 300A, 100W Agilent 6690: 0.0001Ω ± 0.05%, 1000A, 100W DC Power Source with current capability equal to UUT Range: Voltage and current range must exceed that of supply under test. Power: 7kW minimum or 6.
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. Agilent Model Agilent 6690A Agilent 6691A Agilent 6692A Table 2-2. Programming Voltage and Current Values Full Scale Max. Prog. Full Scale Max. Prog. Voltage Voltage Current Current 15V 15.375V 440A 450A 30V 30.75V 220A 225A 60V 60.5V 110A 112A Max. Prog.
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.
Table 2-4. Constant Voltage (CV) Tests Action Normal Result Voltage Programming and Readback Accuracy This test verifies that the voltage programming, GPIB readback (GPIB system power supplies only), and front panel display functions are within specifications. With system power supplies, values read back over the GPIB should be the same as those displayed on the front panel. 1 Turn off the power supply and connect a DVM across +S and -S (see Fig. 2-1).
Table 2-4. Constant Voltage (CV) Tests (continued) Action Normal Result CV Source Effect (cont) 4 Adjust the load to produce full-scale current (see Table 2-2) as shown on the front panel display. 5 Adjust the transformer to decrease the ac input voltage to the low- line condition (174Vac or 191Vac). Record the output voltage reading of the DVM. 6 Adjust the transformer to increase the ac input voltage to the high-line condition (220Vac or 250Vac). Record the output voltage reading on the DVM.
Table 2-4. Constant Voltage (CV) Tests (continued) Action Normal Result Transient Recovery (cont) 3 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%. 4 Turn on the transient and adjust the oscilloscope to display response waveform. See Fig. 2-2.
+ Electronic Load + DVM - Current Monitor Resistor * Power Supply + S + S - - a) CC Test Setup with 6.6kW Electronic Load * Note: Series power source required for CC Load Regulation Test, allows UUT to operate at 0 volts and electronic load to operate at its minimum input voltage specification. Voltage source must always be in CV mode. UUT must be in CC mode for all CC tests. + DVM - Current Monitor Resistor 6.6kW Load Resistor S + b) CC Test Setup with 6.
Table 2-5. Constant Current (CC) Tests Action Normal Result Current Programming and Readback Accuracy This test verifies that the current programming and readback are within specification. 1 Turn off the power supply and connect the current monitoring resistor as shown in Fig. 2-3. Connect a DVM across the resistor . 2 Turn on the power supply and program the output for 5 volts and 0 amperes. 3 Short the load. 4 Observe the DVM voltage reading.
Table 2-5. Constant Current (CC) Tests (continued) Action Normal Result CC Source Effect This test measures the change in output current resulting from a change in ac line voltage from its minimum to its maximum value within the line voltage specifications. It is recommended that you use averaged readings for Steps 6 and 8 of this test (see "Averaging AC Measurements" at the end of this chapter) . 1 Turn off the power supply and connect the ac power input through a variable-voltage transformer.
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.
Table 2-6. Performance Test Record Form Test Facility: __________________________________________ __________________________________________ __________________________________________ Model_____________________________________ Serial No __________________________________ Options ____________________________________ Firmware Revision ___________________________ Report No.
Table 2-7. Performance Test Record for Agilent Model 6690A MODEL Agilent_____________ Report No.________ Test Description Minimum Spec. Date___________ Results * Maximum Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0V) Vout Front Panel Display Readback -15mV Vout - 22.5mV ________mV ________mV +15mV Vout + 22.5mV High Voltage (15V) Vout Front Panel Display Readback 14.979V Vout -30mV _________V _______mV 15.021V Vout + 30mV Load Effect Vout - 0.
Table 2-8. Performance Test Record for Agilent Model 6691A MODEL Agilent_____________ Report No.________ Test Description Minimum Spec. Date___________ Results * Maximum Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0V) Vout Front Panel Display Readback -30mV Vout - 45mV ________mV ________mV +30mV Vout + 45mV High Voltage (30V) Vout Front Panel Display Readback 29.958V Vout - 60mV _________V _______mV 30.042V Vout + 60mV Load Effect Vout - 1.
Table 2-9. Performance Test Record for Agilent Model 6692A MODEL Agilent_____________ Report No.________ Test Description Minimum Spec. Date___________ Results * Maximum Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0V) Vout Front Panel Display Readback -60mV Vout - 90mV ________mV ________mV +60mV Vout + 90mV High Voltage (60V) Vout Front Panel Display Readback 59.916V Vout - 120mV _________V _______mV 60.084V Vout + 120mV Load Effect Vout - 3.
3 Troubleshooting Introduction 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 ESD (electrostatic discharge). Observe standard antistatic precautions to avoid damage to the components (see Chapter 1).
Power-On Selftest Description The procedures in the troubleshooting charts make use of the power-on selftest. The power-on selftest tests the front panel, GPIB interface (for GPIB system power supplies), and secondary interface circuits. If the power supply fails the selftest, the output remains disabled (turned off) and the front panel normally displays an error code or message (see Table 3-2). The message is displayed indefinitely and the power supply will not accept GPIB or front panel commands.
Code and/or Message Table 3-2. Selftest Error Codes/Messages Description Probable Cause Selftest Error Codes/Messages El FP RAM Front panel RAM test failed (power-on). A1 board probably defective.* E2 FP ROM Front panel ROM test failed (power-on and *TST?). A1 board probably defective.* E3 EE CHKSM Front panel EEPROM checksum test failed (power-on and *TST?). EEPROM U6 on the A1 board probably defective.* E4 PRI XRAM Primary interface external RAM test failed (power-on).
START "OVERALL TROUBLESHOOTING" YES DID YOU DO TROUBLE SHOOTING IN PAGE 3-5 IN OPERATING MANUAL ? NO PERFORM CHECKS IN OPERATING MANUALS, YES TURN OFF SUPPLY AND REMOVE THE TOP COVER AND RFI SHIELD. DISCONNECT LOAD. CONNECT SENSE TERMINALS FOR LOCAL SENSING. TURN ON SUPPLY AND CHECK FOR INDICATION (FAN RUNNING, DISPLAY ON, DC RAIL LED DS420, DS421 ON) THAT AC POWER IS ON. YES IS NO FAN RUNNING ? CHECK FOR AC POWER ON A4 BOARD. CHECK F800 AND CHECK FOR 24 V BIAS ON A6 BOARD.
A FROM SHEET 1 VOLTAGE DISPLAY WITHIN SPECS? READS OK BUT OUTSIDE SPECS? NO YES NO PROBABLE DEFECTIVE A10 BOARD YES CALIBRATE SUPPLY. IS CV ANNUNCIATOR ON? YES NO PROBABLE DEFECTIVE A10 BOARD TURN OFF SUPPLY AND CONNECT A SHUNT (SEE TABLE 3-1) ACROSS THE OUTPUT TERMINALS. TURN ON SUPPLY AND PROGRAM FULL-SCALE VOLTAGE AND CURRENT. OUTPUT CURRENT WITHIN SPECS? NO CURRENT OK BUT OUTSIDE SPECS? YES CURRENT DISPLAY WITHIN SPECS? YES CALIBRATE SUPPLY.
FROM SHEET 2 D 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 < 1 SECOND. NO LESS THAN 1 SECOND? GO TO 'SLOW DOWN PROGRAMMING' TROUBLESHOOTING (SEE FIG. 3-12). YES TURN OFF SUPPLY AND CONNECT A GPIB CONTROLLER TO SUPPLY. CHECK IF SUPPLY ACCEPTS GPIB COMMANDS.
FROM SHEET 2 FROM SHEET 1 C B PROT ANNUNCIATOR NO OUTPUT NO VOLTAGE NEAR ON? OV? YES GO TO "OUTPUT HELD LOW" TROUBLESHOOTING FIG. 3-5 YES GO TO "OUTPUT HELD HIGH" PRESS PROTECT KEY YES VOLTAGE RIGHT BUT OUTSIDE SPEC? NO PROBABLE DEFECTIVE A10 BOARD TROUBLESHOOTING FIG. 3-6. YES "OT" PROBABLE DEFECTIVE A10 BOARD DISPLAYED? NO "OV" YES DISPLAYED? GO TO "OV AT TURN-ON" TROUBLESHOOTING FIG 3-4.
START "NO DISPLAY" WARNING: THS CONFIGURATION IS FOR THE TEST ONLY. DO NOT TURN OFF SUPPLY, REMOVE TOP COVER AND RFI SHIELD. UNPLUG CABLE W5 FROM J108 ON A2 GPIB BOARD AND UNPLUG CABLE W4 FROM J507 ON A10 CONTROL BOARD. PLUG CABLE W5 INTO J507 ON A10 BOARD. THIS REMOVES GPIB BOARD FROM THE DATA PATH AND CONNECTS THE FRONT PANEL DIRECTLY TO THE CONTROL BOARD, SEE WARNING. TURN ON THE SUPPLY AND TRY TO PROGRAM THE SUPPLY FROM THE FRONT PANEL.
START "OV WILL NOT FIRE" TURN OFF SUPPLY, REMOVE TOP COVER AND RFI SHIELD. TURN ON SUPPLY AND CHECK BIAS AND REFERENCE VOLTAGES (TEST POINTS 15 THROUGH 22 . SEE TABLE 6-3). NO PROBABLE DEFECTIVE A6 BOARD VOLTAGES OK? YES 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 OVERVOLTAGE CONDITION IS NOT DETECTED (OV ANNUNCIATOR IS OFF).
START "OV AT TURN-ON" WARNING: DURING THESE TESTS THE OUTPUT MAY BE AT HAZARDOUS LEVELS. CHECK THAT THE OUTPUT VOLTAGE SETTING IS NOT HIGHER THAN THE OV SETTING IN THE MEMORY REGISTER. PROGRAM 0 VOLTS AND MAXIMUM OV. THEN SAVE IN REGISTER 0 (PRESS THE SHIFT, SAVE, 0, ENTER KEYS). CONNECT A DC SCOPE ACROSS THE OUTPUT TERMINALS. TURN ON SUPPLY AND CHECK THAT OUTPUT DOES NOT MOMENTARILY GO HIGHER THAN THE VOLTAGE SETTINGS. TURN OFF SUPPLY.
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? NO PROBABLE DEFECTIVE A6 BOARD YES TURN OFF SUPPLY AND GO TO "A5 CONTROL BOARD TROUBLESHOOTING 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.
START "OUTPUT HELD HIGH" TURN OFF THE SUPPLY AND REMOVE THE COVER AND RFI SHIELD. DISCONNECT LOAD. TURN SUPPLY ON AND CHECK THE BIAS AND REFERENCE VOLTAGES (TEST POINTS 9 THROUGH 22 . SEE TABLE 6-3. ARE VOLTAGES NO PROBABLE DEFECTIVE A6 BOARD OK? YES DISABLE THE OV CIRCUIT BY LIFTING A10R536. TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO ZERO.
START "DAC DEFECTIVE" TURN OFF SUPPLY AND REMOVE TOP COVER. TURN ON SUPPLY AND CHECK BIAS AND REFERENCE VOLTAGES (TEST POINTS 9 THE SUPPLY, DEPRESS THE 7 KEY AND THEN TURN IT ON WHILE HOLDING THE KEY DOWN SO AS TO SKIP SELF TEST. THOUGH 22 . (SEE TABLE 6-3*). ARE VOLTAGES OK? * IF THE SUPPLY FAILS SELF TEST, TURN OFF NO PROBABLE DEFECTIVE A6 BOARD YES SHORT A10U506-1 (SA MODE) TO A10U506-20 (COM), SEE FIG. 3-15. TURN ON SUPPLY AND WAIT TWO SECONDS THEN REMOVE SHORT.
START "SERIAL DOWN" WARNING: THIS REMOVES THE GPIB BOARD FROM THE DATA PATH AND CONNECTS THE FRONT PANEL DIRECTLY TO THE CONTROL BOARD. THIS CONFIGURATION IS FOR TEST ONLY. DO NOT FLOAT THE OUTPUT OR ATTEMPT TO OPERATE OPERATE THE SUPPLY IN THIS CONFIGURATION. TURN OFF SUPPLY, REMOVE TOP COVER AND RFI SHIELD. UNPLUG CABLE W5 FROM J108 ON A2 GPIB BOARD AND UNPLUG CABLE W4 FROM J507 ON A10 CONTROL BOARD. PLUG CABLE W5 INTO J507 ON A10 BOARD (SEE WARNING).
START "SECONDARY DOWN" DISPLAY READS "SECONDARY DN". TURN OFF SUPPLY AND REMOVE TOP COVER. TURN ON SUPPLY AND CHECK FOR SERIAL DATA PULSES AT A2U110-8 TEST POINT WITH RESPECT TO PRIMARY GROUND 1 . PULSES 5 (SEE TABLE 6-3). NO PROBABLE DEFECTIVE A2 BOARD AT A2U110-8? YES CHECK FOR 5V AT A2U110-8 WITH RESPECT TO SECONDARY COMMON (A2U110-5) 12 CHECK CABLE W4. CHECK 5V AT NO SECONDARY BIAS CIRCUIT TEST POINTS 20 A2U110-8 21 AND 22 . (SEE TABLE 6-3).
START "SLOW DOWN PROGRAMMING" TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO 1/2 FULL SCALE. CHECK VOLTAGE LEVELS AT A10U609-1 AND A10U610-1 WITH RESPECT TO SECONDARY COMMON 36 . SEE TABLE 6-3. CHECK FUSES A9F980, F981 BY MEASURING CONTINUITY A10U610-1 NO = +2.5V? PROBABLE DEFECTIVE A10 BOARD YES A10U609-1 < 10V? NO PROBABLE DEFECTIVE A10 BOARD YES PROBABLE DEFECTIVE A9 BOARD NOTE: SHOULD TOGGLE BETWEEN <1 V WITH OUTPUT OFF AND APPROX. 11 V WITH OUTPUT ON Figure 3-10.
Note 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 (refer to the disassembly procedures at the back of this chapter If any power FET (Q201-204, Q301-304, Q211, Q311, Q222, Q322, Q233, Q333, Q244, Q344) is defective, you must replace all eight with a matched set. TURN OFF SUPPLY AND REMOVE A3 FET BOARD WITH HEATSINK ASSEMBLY ATTACHED.
Firmware Revisions Firmware revision labels are located on the Front panel ROM, AlU3, and on the Secondary microprocessor, A5U504. You can obtain the revisions with the GPIB *IDN? query command. The following sample Agilent BASIC program does this: 10 ALLOCATE L$[52] 20 OUTPUT 705;"*IDN?" 30 ENTER 705;L$ 40 DISP L$ 50 END For a typical Model 6691A, the controller will return a string with four comma-separated fields, as follows: "Hewlett-Packard ,6691A,O,fA.01.05sA.01.04pA.0l.
Figure 3-12. Test Header Jumper Positions 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 A10 Control Board Component CV/CC DACs/operational amplifiers, CV/CC control circuit amplifiers, readback DAC/operational amplifier, readback comparators.
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 A1 Front Panel Board from the NORM to the FACTORY PRESET CAL position (see Figure 3-15). 3.
10 ! Program to initialize EPROM or move factory preset data in 669xA 20 ! power supplies. 30 ! RE-STORE " INIT_669X" 40 ! Rev A.00.
550 RESTORE Eprom_data_len 560 ! 570 FOR I=l T0 49 580 READ Length(I) 590 NEXT I 600 ! 610 SELECT TRIM$(UPC$(Model$)) ! Delete leading/trailing zeros and set to uppercase 620 CASE "6690A" 630 RESTORE Eprom_data_6690 640 CASE "6691A" 650 RESTORE Eprom_data_6691 660 CASE "6692A" 670 RESTORE Eprom_data_6692 680 ! 690 CASE ELSE 700 PRINT "Model number not found.
1090 1100 1110 1120 1130 1140 1150 1160 1170 1180 1190 1200 1210 1220 1230 1240 1250 1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370 1380 1390 1400 1410 1420 1430 1440 1450 1460 1470 1480 1490 1500 1510 1520 1530 1540 1550 1560 1570 1580 1590 1600 1610 1620 Start: ! ! INPUT “Select Initialization (I) or Factory preset replacement (F).
1630 RESTORE Fact_cal_len 1640 FOR I=1 T0 9 1650 READ Cal_length(I) 1660 NEXT I 1670 ! 1680 FOR I=1 T0 9 ! Locations of good data 1690 OUTPUT @Ps;"DIAG:EEPR? ";Cal_sour_addr(I);",";Cal_length(I) ! Read good data 1700 ENTER @Ps;Cal_data$ ! Enter good data 1710 OUTPUT @Ps;"DIAG:EEPR";Cal_dest_addr(I);",";Cal_length(I);”,”;Cal_data$ 1720 ! Write good data to factory preset locations 1730 NEXT I 1740 ! 1750 ! 1760 Cal_off 1770 CLEAR SCREEN 1780 OUTPUT @Ps;"CaL:STATE OFF" ! Turn off cal mode 1790 ! 1800 GOSUB Ps
Tools Required • • • • • TORX screwdriver size T-15 (for most all retaining screws). TORX screwdriver size T-20 (for power supply carry straps). Seven (7) mm metric hex driver (to remove GPIB read connector). Pencil, paper, and labels to make notes to aid in the reinstallation of components.
A4 AC Input Assembly To remove the A4 AC Input Board first remove the GPIB board, then disconnect these cables from the following connectors at the GPIB board: 1. 2. 3. 4. 5. 6. Disconnect the cables going to connector J417 and J420. Disconnect the cable going to connector J419. Remove the holding screw at the center of board just to the left of the 3-phase choke. Disconnect phone cable going to J108. Slide the board to the right and lift out. Other wires going to the board can now be removed/unsoldered.
Front Panel Assembly 1. 2. 3. 4. 5. 6. 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 A1 Front Panel Board. Record the color code and the location of each of the four wires connected to line switch S1. Disconnect the wires from the switch assembly. Remove the front panel assembly. S1 Line Switch 1. 2.
Output Bus Boards A7, A81 and A9 & Chassis Components Note To remove the A7 Snubber Board, A8 Fast Sense Assembly, A9 Downprogrammer and other chassis mounted components, first remove the A10 Control Board frame assembly and the two Rectifier Heat Sinks described earlier. Once the heat sinks are removed you will have access to the A7, A8, and A9 boards as well as other chassis mounted components.
Figure 3-15.
Figure 3-16.
Figure 3-17.
Figure 3-18.
Figure 3-19.
Figure 3-20.
4 Principles of Operation Introduction Figure 4-3 (at the end of this chapter) is a block diagram showing the major circuits within the power supply. The power supply consists of the following circuits: • • • • • • • • • • A1 Front Panel Board circuits. A2 GPIB circuits. A10 Control Board including the secondary interface ckts, CV/CC control ckts, switching/downprogramming control circuits. Power circuits on the A4 AC Input Board. A3 FET Assembly circuits. A5 DC Rail Board circuits.
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. The desired digital interface function is selected by placing a jumper in a header (J106) on the A2 GPIB Board.
The Secondary Microprocessor translates serial data received from the A2 board into parallel 12 bit data. The data bus is connected directly to the four DAC/OpAmp circuits. Under control of the lip the selected DAC converts the bus data into an analog signal. The DAC reference circuit (U503, U504) provides a +10V reference for the CV and CC DACs and a -11.6V reference for the readback DAC. Zener VR501 provides a-6.2V reference for the OV Shunt DAC.
A low-level CV or CC signal is generated by the applicable status comparator (P/O U502) and returned to the secondary processor to indicate that the corresponding mode, CV or CC, is in effect. In CV mode, an OR gate diode (D652) conducts and the CV loop regulates the output voltage. A CV error amplifier (P/O U621) compares the programmed voltage signal CVPROG to VMON which is the output signal from the V_DIF amplifier(P/O U621).
A5 DC Rail Board The A5 DC Rail board contains the full-wave, three-phase, rectifiers and the input filter circuits. The ac mains are full-wave rectified by D420-D425 and converted to two, 300-volt dc rails by filter capacitors, C423-C426, and by two range select connectors. In range 1 (180-235Vac), J438 connects the two DC rails, called Rail #1 and Rail #2, in parallel. Each rail supplies 300Vdc to the A3 FET board via J430 and J431. In Range 2 (360-440Vac), J439 connects the two DC rails in series.
Output Circuits The output circuits include the following circuits: • Chassis mounted components. • Two power transformers, T900/T901. • Two inductors, L900/L901. • Two rectifiers, D900/D901. • Output capacitors. • A7 Snubber board mounted to the heat sink. • A8 Fast Sense board. • A9 Slow/Downprogrammer board and output bus bars. Each combination of power transformers, T900/T901, and rectifiers, D900/D901, couples the output pulses from the A3 FET board.
5 Replaceable Parts Introduction This section lists the replaceable electrical and mechanical parts for the Agilent 669xA series power supplies. (Component location diagrams are located in Chapter 6.
Table 5-1.
Table 5-1. Main Chassis, Replaceable Parts (continued) 06652-00005 1252-1488 1252-3698 3160-4117 5001-0538 5001-0539 5001-6776 5002-1591 5182-9192 5001-6779 5040-1697 5001-6793 5020-2783 5020-2785 5020-2797 5040-1691 5002-1592 9310-6711 5065-6933 2110-1312 5041-8801 5041-8819 5041-8820 5062-3705 5080-2545 5080-2418 5080-2414 5080-2415 5964-8269 Ref. Desig. A1 Table 5-2. Front Panel Assembly, Replaceable Parts Agilent Part No.
Table 5-4. A3 FET Assembly, Replaceable Parts Agilent Part No. Description Ref. Desig. Q201-204, 211, 222, 233, 244 Q301-304, 311, 322, 333, 344 1855-1674 1855-1674 5080-2279 5080-2283 Table 5-5. A4 AC Input Assembly, Replaceable Parts Agilent Part No. Description Ref. Desig. J419 K401 1251-6832 0490-1908 5080-2284 CONNECTOR RELAY 24V COIL CABLE RELAY CTRL (E411-E413 to BIAS J827) Table 5-6. A5 DC Rail Assembly, Replaceable Parts Agilent Part No. Description Ref. Desig.
6 Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining Agilent Series 669xA 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. In the diagrams, the name of a complementary signal is sometimes shown with a bar above the signal mnemonic.
Mnemonic A(0)--A(15) AD (O)--AD(7) AMB_SENSE ANA(0)--ANA(7) ATN BIAS_OK BOVPROG BSTX cc CCPROG cv CVPROG D(0)_D(7) D101--Dl08 DAV DFI DFI-EN DPS DN_PGM DRIVE_A/B EOI FAC_CAL FAN_PWM FPRX FPTX FS HSRQ IFC IMON INH_CAL IP IPROG ISEN ISRQ KO(0)-KO(5) KI(0)--KI(5) Table 6-2.
TEST POINT No. & Loc. Table 6-3. Test Points (continued) Signal Tested Measurement and Conditions A4 AC Input Board Connect meter between TP 9 and 10, or 9 and 11, or 10 and 11, and measure approximately 220VAC or 440VAC.
TEST POINT No. & Loc. Table 6-3. Test Points (continued) Signal Tested Measurement and Conditions A10 Control Board Secondary common (Sheet 1) U603-13 Connect meter or scope common here. Make measurements at test points 37 - 61, and 62 - 70. CC/CC DACs reference (Sheet 1) +10V ± 0.05V Readback DAC reference (Sheet 1) -11.6V ± 0.1V CVPROG (Sheets 2,4) See Figure 6-1 See Figure 6-1 CCPROG (Sheets 2,4) NOTE: Measurement and Conditions for test points 41 through 70 are as follows: 1. Voltage = ½ scale a.
Table 6-4. General Schematic Notes 1. 2. 3. 4. 5. 6. Schematic sheets are not intended for component-level troubleshooting. Component values and ratings do not match the values used on all models. All resistors are in ohms ±1%, 1/8W, unless otherwise specified. All capacitors are in microfarads unless otherwise specified. Signal lines that are terminated by flags continue on other sheets, and may also go to other locations on the same sheet. Example: CVPROG (SH.2 8C); "SH.
Figure 6-1.
FAN 180-235 VAC J801 RANGE 1 3O A2 GPIB P101 5182-9185 LINE CHOKE 5182-9200 RANGE 2 A6 BIAS ASSEMBLY 360-440 VAC E412 J809 5080-2280 5080 (W4) 2168 J830 5080-2283 J507 5080-2316 J910 J512 5080-2287 E1000 A8 E1001 FAST SENSE E1002 A9 5080-2284 J827 E413 E800 TO E803 J509 A10 CONTROL ASSEMBLY 5080 2283 J831 E411 J511 J816 A4 AC INPUT ASSEMBLY GRA J510 J821 OR T418 RFI FILTER J6 J107 J417 A1 FRONT PANEL ASSEMBLY 5080-2168 (W5) J108 SLOW SENSE DOWNPROGRAM 5080 E4
Figure 6-3.
Schematic sheets are not intended for component-level troubleshooting. Component values and ratings may not match the values used on all models. Figure 6-4.
Figure 6-5.
2 3 4 5 6 7 1 8 Schematic sheets are not intended for component-level troubleshooting. Component values and ratings may not match the values used on all models. Figure 6-6.
Figure 6-7.
Schematic sheets are not intended for component-level troubleshooting. Component values and ratings may not match the values used on all models. Figure 6-8.
Schematic sheets are not intended for component-level troubleshooting. Component values and ratings may not match the values used on all models. Figure 6-8.
12_AWG_AMPIN PHASE 2 PHASE 1 L1 BLK 3 4 1 2 12_AWG_AMPIN TO AC INPUT RAIL E401 (GRA) C7 4.7M 5% 1/4W 900 0683-4755 R1 1UF 20% 275V PM 0160-7606 6 9140-2548 C4 5 E19411 .01UF 20% 250V PM 0160-4355 SINGLE PHASE INPUT 1UF 20% 275V PM 0160-7606 C1 E1942 CHASSIS 12_AWG_AMPIN PHASE 1 PHASE 2 12_AWG_AMPIN TO AC INPUT E402 (WHT/GRA/BRN) WHT E19132 .01UF 20% 250V PM 0160-4355 C8 4.
12 11 10 9 Figure 6-11.
1 J419 2 3 5 PIN UTILITY 4 TO BIAS PCB 5 1251-6832 BIAS / FUSE LED E400 TO J19133 WHT / RED / GRA CONNECTOR X K401 LUG E401 TO J19132 GRA Y LUG E402 WHT / BRN / GRA 8 3 4 5 6 1 2 LUG 1UF 20% 275V PM 0160-7606 C402 C401 1UF 20% 275V PM 0160-7606 C400 9 R407 27 5% 20W 0699-3191 R408 1 J417 2 27 5% 20W 0699-3191 0490-1908 1UF 20% 275V PM 0160-7606 TO J1942 Z 7 3 4 10 5 12 PIN UTILITY 6 7 +24.
13 14 Figure 6-13.
R429 8.2K 5% 2W 200 0764-0044 R430 8.2K 5% 2W 200 0764-0044 13 L420 8.2K 5% 2W 200 0764-0044 ASSY: 5064-0070 8.2K 5% 2W 200 0764-0044 DS420 L421 RED (COIL: 5080-2263 / SLUG: 9170-1575) DS421 1 2 5080-2300 .022 20% 250V PM NL0160-4048 C419 .022 20% 250V PM 0160-4048 C418 MP8 1990-0517 RED R431 50-10% 1500 AL 400V 149674 1 1252-1346 8.
20 19 22 19 17 18 16 15 Figure 6-15.
19 668xA 669xA 21 22 20 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.
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. Figure 6-16.
Figure 6-17.
Schematic sheets are not intended for component-level troubleshooting. Component values and ratings may not match the values used on all models. Figure 6-18. A7 Snubber Board, Component Location and Schematic Diagram Figure 6-19.
Schematic sheets are not intended for component-level troubleshooting. Component values and ratings may not match the values used on all models. Figure 6-20.
45 44 42 41 47 46 48 43 63 53 55 51 50 38 49 37 21 36 22 20 39 40 36 60 62 61 59 54 52 57 58 56 64 Figure 6-21.
21 22 36 20 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. Figure 6-22.
39 40 64 Schematic sheets are not intended for component-level troubleshooting. Component values and ratings may not match the values used on all models. Figure 6-22.
50 58 54 56 52 51 57 61 59 53 49 60 55 62 65 66 Schematic sheets are not intended for component-level troubleshooting. Component values and ratings may not match the values used on all models. Figure 6-22.
43 39 41 48 42 47 45 46 40 44 Schematic sheets are not intended for component-level troubleshooting. Component values and ratings may not match the values used on all models. Figure 6-22.
A Backdating Manual backdating describes changes that must be made to this manual for power supplies whose serial numbers predate the latest revision of this manual. Look in the following table and locate your Agilent model. Then look at each serial number listed for this group. If the serial number of your power supply is prior to any of the serial number(s) listed, perform the change indicated in the Change column. Note that several changes can apply to your supply.
Index A averaging constant current measurements, 19 B backdating, 99 block diagram, 64 C cabling diagram, 75 CAL DENIED, 43 calibration inhibit, 43 jumper, 43 post-repair, 43 constant current load effect test, 17 constant current source effect test, 18 constant voltage load effect test, 13 constant voltage noise test, 14 constant voltage source effect test, 13 current programming and readback accuracy test, 17 E11 TEMP, 27 E12 DACS, 27 E2 FP ROM, 27 E3 EE CHKSM, 27 E4 PRI XRAM, 27 E5 PRI IRAM, 27 E6 PRI
dc rail board, 63 FET board, 63 front panel, 60 GPIB board, 59 H bridge, 63 input board, 62 output circuits, 64 principles of, 59 SERIAL TIMOUT, 27 signal names, 70 SUBF OVERRUN, 27 T P performance tests, 9, 11 power-on selftest, 26 disabling, 26 R replaceable parts ac input assembly, 68 bias assembly, 68 chassis, 65 dc rail assembly, 68 down programmer/slow sense, 68 fast sense assembly, 68 FET assembly, 68 front panel, 67 GPIB board, 67 S safety symbols, 4 SBUF FULL, 27 schematic ac input board, 85 b
