Page 2 - Technologies' full line of Support Programs.
2 CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. AgilentTechnologies further certifies that its calibration measurements are traceable to the United States National Bureau ofStandards, to the extent allowed by the...
Page 3 - SAFETY CONSIDERATIONS
3 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...
Page 4 - Safety Symbol Definitions; Symbol; Printing History
4 Safety Symbol Definitions Symbol Description Symbol Description Direct current Terminal for Line conductor on permanentlyinstalled equipment Alternating current Caution, risk of electric shock Both direct and alternating current Caution, hot surface Three-phase alternating current Caution (refer t...
Page 5 - Table of Contents
5 Table of Contents Introduction ............................................................................................................................................................................ 7 Scope..........................................................................................
Page 7 - Introduction; Scope; Chapter; Instrument Identification; Item
Introduction 7 1 Introduction Scope Organization This manual contains information for troubleshooting and repairing to the component level Agilent Series 668xA,5-kilowatt power supplies. The remaining chapters of this manual are organized as follows: Chapter Description Chapter 2 Verification proced...
Page 8 - Related Documents; Change Sheet; Manual Change; Operating Manual; Manual Revisions
Introduction 8 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 ...
Page 9 - Safety Considerations; system; Electrostatic Discharge; actual failure does not occur.
Introduction 9 Safety Considerations This power supply is a Safety Class I instrument, which means it has a protective earth terminal. This terminal must beconnected to earth ground through a power source equipped with a 4-wire, ground receptacle. Refer to the "SafetySummary" page at the beg...
Page 10 - Verification 11; Verification; Type of Test; Operation Verification
Verification 11 2 Verification Introduction This chapter provides test procedures for checking the operation of Agilent Series 668xA power supplies. The required testequipment is specified and sample performance test record sheets are included. Instructions are given for performing thetests either f...
Page 11 - μΩ; Electronic Load
12 Verification Table 2-1. Test Equipment Required Type Required Characteristics Recommended Model Digital Voltmeter 1 Resolution: 10 nV @ 1V Agilent 3458A Readout: 8 1/2 digits Accuracy: 20 ppm Current Monitor Resistor 1 Agilent 6682A, 6683A, Agilent 6684A: Guildline 9230/300 0.001 Ω ± 0.04%, 300A,...
Page 12 - only by qualified electronics personnel.; General Measurement Techniques
Verification 13 Programming The Tests General Considerations Procedures are given for programming these tests either from the front panel keypad or from a GPIB controller. Theprocedures assume you know how to use the front panel keypad or how to program over the GPIB (see the Power SupplyOperating M...
Page 13 - 4 Verification; Operation Verification Tests; Test; Performance Tests; Test Setup; Note
14 Verification 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 Tab...
Page 14 - Verification 15
Verification 15 Figure 2-1. Constant Voltage (CV) Test Setup
Page 16 - CV; CV; Record the amplitude of the waveform.
Verification 17 Table 2-4. Constant Voltage (CV) Tests (continued) Action Normal Result CV Source Effect (cont) 2 Set the transformer to the nominal ac line voltage. Connect the DVMacross +S and -S (see Fig. 2-1). 3 Turn on the power supply and program the current to its maximumprogrammable value an...
Page 18 - Current Programming and Readback Accuracy.; Action; Record the front panel display readback.
Verification 19 Constant Current (CC) Tests Test Setup Connect the appropriate current monitoring resistor (see Table 2-l) as shown in Fig. 2-3. The accuracy of the resistor mustbe as specified in the table. Test Procedures The test procedures are given in Table 2-5. The tests are independent and ma...
Page 19 - CC
20 Verification Table 2-5. Constant Current (CC) Tests (continued) Action Normal Result CC Noise (PARD) (cont) 2 Measure the residual noise on the DVM with the power supply turned off.Noise generated by other equipment may affect this measurement andshould be removed or factored out. 3 Turn on the p...
Page 20 - Set the Electronic Load to CV mode and its voltage to full scale.; annunciator is on. If
Verification 21 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 itsmaximum value within the line voltage specifications. It is recommended that you ...
Page 21 - 2 Verification
22 Verification Figure 2-3. CC Load Effect Test Setup
Page 22 - Verification 23
Verification 23 Figure 2-4. CC rms Noise Test Setup
Page 23 - 4 Verification; Averaging the CC Measurements
24 Verification Averaging the CC Measurements The CC Load Effect and CC Source Effect tests measure the dc regulation of the power supply's output current. Whendoing these tests, you must be sure that the readings taken are truly dc regulation values and not instantaneous ac peaks ofthe output curre...
Page 24 - Ambient Temperature (; Description; Current Monitoring
Verification 25 Table 2-6. Performance Test Record Form Test Facility : __________________________________________ Report No.__________________________________________ __________________________________________ Date______________________________________________ ______________________________________...
Page 30 - Troubleshooting 31; Troubleshooting; Shock Hazard; Topic
Troubleshooting 31 3 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 ...
Page 31 - PWR ON INIT
32 Troubleshooting 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 access to IC pins. AP Products No. LTC Ammeter/Current Shunt To measure output current. Agilent 6680A & 668...
Page 33 - 4 Troubleshooting; Troubleshooting Charts; Chart; Troubleshooting Test Points
34 Troubleshooting Troubleshooting Charts Figure 3-1 gives overall troubleshooting procedures to isolate the fault to a circuit board or particular circuit (see Figure3-20 for the location of the circuit boards). These procedures include the use of power-on selftest (Table 3-2) and signatureanalysis...
Page 34 - Troubleshooting 35
Troubleshooting 35 Figure 3-1. Overall Troubleshooting (Sheet 1 of 4)
Page 35 - 6 Troubleshooting
36 Troubleshooting Figure 3-1. Overall Troubleshooting (Sheet 2 of 4)
Page 36 - Troubleshooting 37
Troubleshooting 37 Figure 3-1. Overall Troubleshooting (Sheet 3 of 4)
Page 37 - 8 Troubleshooting
38 Troubleshooting Figure 3-1. Overall Troubleshooting (Sheet 4 of 4)
Page 38 - Troubleshooting 39
Troubleshooting 39 Figure 3-2. No Display Troubleshooting
Page 40 - Troubleshooting 41
Troubleshooting 41 Figure 3-4. OV At Turn-On Troubleshooting
Page 41 - 2 Troubleshooting
42 Troubleshooting Figure 3-5. Output Held Low Troubleshooting (Sheet 1 of 2)
Page 42 - Troubleshooting 43
Troubleshooting 43 Figure 3-5. Output Held Low Troubleshooting (Sheet 2 of 2)
Page 45 - 6 Troubleshooting
Page 46 - Troubleshooting 47
Troubleshooting 47 Figure 3-9. CV/CC DAC and Amplifier Circuit Troubleshooting
Page 47 - 8 Troubleshooting
48 Troubleshooting Figure 3-10. Serial Down Troubleshooting (Sheet 1 of 2)
Page 48 - Troubleshooting 49
Troubleshooting 49 Figure 3-10. Serial Down Troubleshooting (Sheet 2 of 2)
Page 49 - 0 Troubleshooting
50 Troubleshooting Figure 3-11. Secondary Interface Down (Sheet 1 of 2)
Page 50 - Troubleshooting 51
Troubleshooting 51 Figure 3-11. Secondary Interface Down (Sheet 2 of 2)
Page 52 - Troubleshooting 53; CV/CC Status Annunciators Troubleshooting; Procedure; Measure the resistance between the gate of each FET
Troubleshooting 53 CV/CC Status Annunciators Troubleshooting When troubleshooting the CV/CC status annunciators or status readback circuits, first measure the voltage drop across thegating diodes, which are Al0D651 for the CC circuit and Al0D652 for the CV circuit (see A10, Sheet 2). A conductingdio...
Page 55 - 6 Troubleshooting; Signature Analysis; The following general rules apply to signature analysis testing:; Firmware Revisions
56 Troubleshooting Signature Analysis Introduction The easiest and most efficient method of troubleshooting microprocessor-based instruments is with signature analysis (SA).This technique is similar to signal tracing with an oscilloscope in linear circuits. Part of the microprocessor memory isdedica...
Page 56 - Troubleshooting 57; Test Headers; Pins; Front Panel Test Connector A1J3; Install jumper here for SA mode.; Figure 3-14. Test Header Jumper Positions
Troubleshooting 57 Test Headers The power supply has two test headers as shown in Figure 3-15, each with a jumper that can be moved to differentpositions for SA testing and for other functions. To gain access to the headers, remove the power supply top cover. Pins Description Primary Interface Test ...
Page 57 - Turn off the power supply and remove the top cover.; Figure 3-15. Signature Analysis Signal Inputs
58 Troubleshooting 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...
Page 58 - Troubleshooting 59
Troubleshooting 59 Figure 3-16. Signature Analysis Connections, (Sheet 1 of 2)
Page 59 - : These signatures check front panel microprocessor AlU3.; Valid A1U4 ROM Firmware Revision:; .Turn off the power supply and remove the top cover.
60 Troubleshooting Figure 3-16. Signature Analysis Connections, (Sheet 2 of 2) Table 3-6. Front Panel SA Test Description : These signatures check front panel microprocessor AlU3. Valid A1U4 ROM Firmware Revision: A.01.07 Test Setup: See Figure 3-17. 1 .Turn off the power supply and remove the top c...
Page 60 - : These signatures check the secondary microprocessor A5U504.; Valid A5U504 ROM Firmware Revision:
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 Figure 3-17. 1. Turn off the power supply and remove the top cover. 2. To obtain a setup that allows access ...
Page 62 - Troubleshooting 63; EEPROM Initialization
Troubleshooting 63 EEPROM Initialization EEPROM AlU6 on the A1 Front Panel Board stores the supply's GPIB address, model number, and constants required toprogram and calibrate the power supply. If either the front panel board or the EEPROM is replaced, the power supply mustbe reinitialized with the ...
Page 63 - 4 Troubleshooting; ! Program to initialize EPROM or move factory preset data in 668xA
64 Troubleshooting 10 ! Program to initialize EPROM or move factory preset data in 668xA 20 ! power supplies. 30 ! RE-STORE " INIT_668X" 40 ! Rev A.00.00 dated 09 Nov 1993 50 ! 60 DIM Init_data(1:49),Model$[5],Idn$[21],Cal_data$[40] 70 INTEGER Addr(1:49),Length(1:49) 80 ASSIGN @Ps TO 705 ! S...
Page 64 - Troubleshooting 65
Troubleshooting 65 510 DATA 115,30,20,1,127,.002701,.2,.00042,10.25 520 ! 530 Eprom_data_6684: ! ! EEPROM data for 6684A 540 DATA 93,74,41,0,83,0,29,70,131,0 550 DATA 98,21,4.6,10,50,0,83,255,20,10 560 DATA 6684,87,97,28,93,128,5,255,0,0 570 DATA 1296,6684,0,20,180,20,180,175,33,98 580 DATA 115,30,2...
Page 65 - 6 Troubleshooting
66 Troubleshooting 1020 GOSUB Ps_error ! Error if passcode is not "0"! 1030 IF Err THEN 1040 OUTPUT @Ps;"*IDN?" ! Get data from model # location 1050 ENTER @Ps;Idn$ 1060 Model=VAL(Idn$[POS(Idn$,”,”)+1] ) 1070 ELSE 1080 GOTO Start 1090 END IF 1100 ! 1110 OUTPUT @Ps;"CAL:STATE ON,&...
Page 66 - Troubleshooting 67
Troubleshooting 67 1530 CLEAR SCREEN 1540 PRINT "This program should ONLY be completed if your power supply” 1550 PRINT "EEPROM has been replaced or a component that will effect" 1560 PRINT "the calibration AND the alignment of voltage, overvoltage" 1570 PRINT "and current is...
Page 67 - 8 Troubleshooting; Disassembly Procedures; Tools Required
68 Troubleshooting 2010 IF Err THEN 2020 PRINT "An error occurred during the EEPROM read/write, Check for" 2030 PRINT "programming errors. Initialization data may be incorrect." 2040 STOP 2050 END IF 2060 ! 2070 PRINT "Operation complete. Program stopped." 2080 STOP 2090 ! 21...
Page 68 - Troubleshooting 69; Top Cover; approximately 7 minutes after power is removed; Removing Protective RFI Shield (Galvanized Sheet Metal)
Troubleshooting 69 Top Cover 1. Remove the four screws that secure the carrying straps (two TORX 20 screws on each side). These same screws securethe cover to the chassis. 2. Spread the bottom rear of the cover, and then pull the cover backwards towards the rear of the power supply todisengage it fr...
Page 69 - 0 Troubleshooting; A4 AC Input Assembly
70 Troubleshooting A4 AC Input Assembly To remove the A4 AC Input Board first remove the GPIB board then disconnect these cables from the following connectorsat the GPIB board: 1. Disconnect the cables going to connector J417 and J420. 2. Disconnect the cable going to connector J419. 3. Remove the t...
Page 70 - Troubleshooting 71; Disconnect phone cable W5 from J6 on the A1 Front Panel Board.
Troubleshooting 71 A10 Control Assembly Disconnect the cables from the following connectors at the A10 DC RAIL board: 1. Disconnect the ribbon cable going from to the A6 Bias board. This cable connects to J509 on the A10 board but it iseasier to disconnect it at the A6 Bias Board. 2. Disconnect cabl...
Page 71 - 2 Troubleshooting; A1DSP1 LCD Display; A1G1 and A1G2 Rotary Controls; Remove the A1 Front Panel Board as described in that procedure.; A1KPD Keypad; Remove the A1 Front Panel Board as described in that procedure.; Output Bus Boards A7, A81 and A9 & Chassis Components
72 Troubleshooting 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 cabl...
Page 72 - Troubleshooting 73
Troubleshooting 73 Figure 3-18. Component Locations (Top Cover and RFI Shield Removed)
Page 73 - 4 Troubleshooting
74 Troubleshooting Figure 3-19. 5-Inch Front Panel Frame Assembly
Page 74 - Troubleshooting 75
Troubleshooting 75 Figure 3-20. 3-Inch Front Panel Frame Assembly
Page 75 - 6 Troubleshooting
76 Troubleshooting Figure 3-21. Assembly A10, Exploded View
Page 76 - Troubleshooting 77
Troubleshooting 77 Figure 3-22. Assembly A10, Exploded View (6680A, 6681A)
Page 77 - 8 Troubleshooting
78 Troubleshooting Figure 3-23. Assembly A10, Exploded View (6682A, 6683A, 6684A)
Page 78 - Troubleshooting 79
Troubleshooting 79 Figure 3-24. Three-Phase Line Choke Subchassis Wiring
Page 79 - 0 Troubleshooting
80 Troubleshooting Figure 3-25. 24 Volt Fan Transformer
Page 80 - Principles Of Operation 81; Principles Of Operation; A1 Front Panel Board ckts.; A2 GPIB Board
Principles Of Operation 81 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 powersupply consists of the following circuits: • A1 Front Panel Board ckts. • A2 GPIB ckts. • A10 Control Board includ...
Page 81 - 2 Principles Of Operation; A1 Front Panel Assembly
82 Principles Of Operation 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 faul...
Page 82 - Principles Of Operation 83; The readback DAC circuit is controlled by the
Principles Of Operation 83 The Secondary Microprocessor translates serial data received from the A2 board into parallel 12 bit data. The data bus isconnected directly to the four DAC/OpAmp circuits. Under control of the lip the selected DAC converts the bus data intoan analog signal. The DAC referen...
Page 83 - 4 Principles Of Operation; P and supplies
84 Principles Of Operation any value of load impedance. Switching between CV and CC is done automatically by the CV/CC control circuits at avalue 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 appl...
Page 84 - Principles Of Operation 85; A4 AC Input Board; Check Fuses; LED to flash. If all three fuses are good,; Check Fuse; A5 DC Rail Board
Principles Of Operation 85 A4 AC Input Board The A4 Input Board contains the Inrush-Current Limit relay (K401), Main Power Relay (K402), current-limiting resistors(R407, R408) and open-fuse-detect resistor circuit (R400-R405). On power-on, the current-limit relay (K401) closesallowing the dc rail ca...
Page 85 - 6 Principles Of Operation; Output Circuits; The output circuits include the following circuits:
86 Principles Of Operation Figure 4-2. 1ST Stage of the FET H-Bridge Configuration Output Circuits The output circuits include the following circuits: • Chassis mounted components. • Two power transformers, T900/T901. • Two inductors, L900/L901. • Four rectifiers, D900 through D903. • Output capacit...
Page 87 - Replaceable Parts 89; Replaceable Parts; INTRODUCTION; Assembly; Reading the Tables; Table 5-2. Part Description Abbreviations
Replaceable Parts 89 5 Replaceable Parts INTRODUCTION Chapter Organization This section lists the replaceable electrical and mechanical parts for the Agilent 668xA series power supplies. (Componentlocation diagrams are located in Chapter 6.) The lists consist of tables organized by assemblies as fol...
Page 88 - 0 Replaceable Parts; How to Order Parts
90 Replaceable Parts How to Order Parts You can order parts from your local Agilent Technologies, Inc. Sales and Support Office (see the list of offices in the backof this manual). When ordering a part, please include the following information: • the Agilent part number • the part description • the ...
Page 101 - not used; MECHANICAL PARTS
Replaceable Parts 103 Table 5-11. A7 Snubber Assembly, Replaceable Parts Ref. Desig. Agilent Part No. Description ELECTRICAL PARTS C910, 911, 912, 913 6680A, 6681A 0160-0162 CAP .022uF 10% 6682A 0160-6896 CAP .015uF 10% 6683A 0160-4845 CAP 6800pF 10% 6684A 0160-6162 CAP 4700pF 10% R910, 911, 912, 91...
Page 102 - XSTR PNP
104 Replaceable Parts Table 5-13. A9 Down Programmer/Slow Sense, Replaceable Parts Ref. Desig. Agilent Part No. Description ELECTRICAL PARTS C950, 951 0160-4259 CAP .22uF 10% C952, 953 0160-4048 CAP .022uF 20% C956, 957 0160-4065 CAP .luF 20% C958, 980 0160-4835 CAP .luF 10% 50V D980, 981 1901-1098 ...
Page 113 - Diagrams; Function
Diagrams 115 6 Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining Agilent Series 668xA Power Supplies.Unless otherwise specified, a drawing or diagram applies to all models of the series. Wiring connections to externalequipment are shown in the Powe...
Page 116 - Test points; A10 Control Board; Programming
118 Diagrams Table 6-3. Test Points (continued) TEST POINT No. & Loc. Signal Tested Measurement and Conditions Bias Board (continued) U308-1 PREF +2.5V U308-5 RESET* Held low for approximately 50 ms at power-on,then goes high. U311-7 FAN DETECT +3V D317 -25V +3V U311-2 FAN_PWN +0.6V A3 FET Board...
Page 117 - General Schematic Notes; Common
Diagrams 119 Table 6-3. Test Points (continued) TEST POINT No. & Loc. Signal Tested Measurement and Conditions A10 Control Board (continued) U600-10 DIVIDER CLOCK (Sheet 3) See Figure 6-1 U601-6 DIVIDER RESET (Sheet 3) See Figure 6-1 U601-3 ON LATCH CLOCK (Sheet 3) See Figure 6-1 U604-3 ON LATCH...
Page 119 - Figure 6-2. Circuit Board Cabling Diagram
Diagrams 121 Figure 6-2. Circuit Board Cabling Diagram
Page 120 - Figure 6-3. A1 Front Panel Board, Component and Test Point Location
122 Diagrams Figure 6-3. A1 Front Panel Board, Component and Test Point Location
Page 128 - Figure 6-11. A4 AC Input Board, Component and Test Point Location
Figure 6-11. A4 AC Input Board, Component and Test Point Location 9 10 11 12
Page 130 - Figure 6-13. A5 DC Rail Board, Component and Test Point Location
Figure 6-13. A5 DC Rail Board, Component and Test Point Location 13 14
Page 132 - Figure 6-15. A6 Bias Board, Component and Test Point Location
Figure 6-15. A6 Bias Board, Component and Test Point Location 15 16 17 18 19
Page 141 - Figure 6-25. A10 Control Board, Component and Test Point Location
Figure 6-25. 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 146 - Backdating; prior; column. Note that, several changes can apply to your supply.; ADD
Backdating 149 A Backdating Manual backdating describes changes that must be made to this manual for power supplies whose serial numbers are lowerthan 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 ...
Page 148 - Diode power rectifier
Backdating 151 Table A-1. A2 GPIB Parts List Ref Desig. Agilent Part No. Description ELECTRICAL PARTS C102-105 0160-4822 Capacitor 1000pF 5% C106 0180-0155 Capacitor 2.2 µ F 20V C107,108 0160-4787 Capacitor 22pF 5% 100V C109-111,114,115,121 0160-5422 Capacitor 0.047 µ F 20% C122 0180-3325 Capacitor ...
Page 150 - Figure A-1. A2 GPIB Component Parts List
Backdating 153 Figure A-1. A2 GPIB Component Parts List
Page 151 - Index; cable
Index 155 Index A A1 Front Panel Board, test header .............................................................................................................................. 57A2 GPIB Board, test header................................................................................................
Page 153 - jumper
Index 157 UART PARITY ................................................................................................................................................... 35 error message, selftest ..........................................................................................................
