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Agilent Technologies 6684A, 6680A, 6683A, 6681A Figure A-1. A2 Gpib Component Parts List Backdating

Models: 6682A 6680A 6681A 6683A 6684A

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Troubleshooting Parts list Error codes Diagrams Signal name Password Safety Symbol Definitions Wire KIT Pins Description Disassembly Procedures

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Figure A-1. A2 GPIB Component Parts List

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Agilent Technologies 6684A, 6680A, 6683A, 6681A, 6682A service manual Figure A-1. A2 Gpib Component Parts List Backdating

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Contents

Agilent Part No Microfiche Part No September Certification Safety Considerations Safety Symbol Definitions Symbol DescriptionPrinting History Table of Contents Replaceable Parts DiagramsPrinciples Of Operation Backdating Chapter Description Scope OrganizationInstrument Identification Introduction Firmware Revisions Related DocumentsManual Revisions Change Sheet Safety Considerations ConventionsElectrostatic Discharge Test Equipment Required List of Equipment IntroductionTests Current-Monitoring Resistor Electronic Load Performance Test Record Sheets Programming The Tests General ConsiderationsGeneral Measurement Techniques Programming Parameters Operation Verification Tests Performance TestsConstant Voltage CV Tests Constant Voltage CV Test Setup Verification CV Load Effect Constant Voltage CV Tests Action Normal ResultVoltage Programming and Readback Accuracy CV Source Effect CV Noise Pard Transient Recovery Time Transient Response Waveform Verification Current Programming and Readback Accuracy Constant Current CC TestsConstant Current CC Tests Action Normal Result CC Noise Pard CC Load Effect CC Source Effect CC Load Effect Test Setup Verification CC rms Noise Test Setup Verification Averaging the CC Measurements Performance Test Record Form Test Facility Results SpecUncertainty Vout 0.5mV Vout + 0.5mV 900 nV Vout 1mV Vout + 1mV Vout 1.7mV Vout + 1.7mV Vout 2.3mV Vout + 2.3mV Chapter Organization Introduction Localizing the ProblemTroubleshooting Topic Information Given Troubleshooting Procedures Power-On Selftest Test Equipment Required PRI Xram FP ROMEE Chksm PRI Iram Chart Trouble or Circuit Troubleshooting ChartsTroubleshooting Test Points Bias and Reference Supplies Overall Troubleshooting Sheet 1 Overall Troubleshooting Sheet 2 Overall Troubleshooting Sheet 3 Overall Troubleshooting Sheet 4 No Display Troubleshooting OV Will Not Fire Troubleshooting OV At Turn-On Troubleshooting Output Held Low Troubleshooting Sheet 1 Output Held Low Troubleshooting Sheet 2 Output Held High Troubleshooting DAC Circuits Troubleshooting DAC Test Waveforms Troubleshooting CV/CC DAC and Amplifier Circuit Troubleshooting 10. Serial Down Troubleshooting Sheet 1 10. Serial Down Troubleshooting Sheet 2 11. Secondary Interface Down Sheet 1 Troubleshooting 11. Secondary Interface Down Sheet 2 Troubleshooting 12. Slow Downprogramming Troubleshooting FET Troubleshooting Chart Procedure Result CV/CC Status Annunciators TroubleshootingA3 FET Board Troubleshooting Static Troubleshooting Dynamic Troubleshooting 13. A3 FET Board Test Waveforms Troubleshooting Signature Analysis Introduction Allocate L$52 Output 705*IDN? Enter 705L$ Disp L$ 50 ENDAgilent Technologies ,6681A,O,fA.01.05sA.01.04pA.0l.02 Pins Description Front Panel Test Connector A1J3Test Headers Primary Interface SA Test Valid A2U106 ROM Firmware Revision A.01.06 16. Signature Analysis Connections, Sheet 1 Troubleshooting Valid A1U4 ROM Firmware Revision A.01.07 Secondary Interface SA Test Valid A5U504 ROM Firmware Revision A.01.04 Inhibit Calibration Jumper Post-Repair Calibration When RequiredCalibration Password Restoring Factory Calibration Constants Initialization I or Factory Preset Replacement F? Initialization I or Factory Preset Replacement F? FEeprom Initialization Clear Screen Case Else END Select Stop ElseEND if Case 1530 Return Disassembly ProceduresTools Required END Top Cover Removing Protective RFI Shield Galvanized Sheet MetalGpib Board A6 Bias Assembly A4 AC Input AssemblyA5 DC Rail Assembly A3 FET Board S1 Line Switch A10 Control AssemblyFront Panel Assembly A1 Front Panel Board A1KPD Keypad A1DSP1 LCD DisplayA1G1 and A1G2 Rotary Controls Output Bus Boards A7, A81 and A9 & Chassis ComponentsPage 19 -Inch Front Panel Frame Assembly Troubleshooting 20 -Inch Front Panel Frame Assembly Troubleshooting 21. Assembly A10, Exploded View Troubleshooting 22. Assembly A10, Exploded View 6680A, 6681A Troubleshooting Page 24. Three-Phase Line Choke Subchassis Wiring Troubleshooting 25 Volt Fan Transformer Troubleshooting A2 Gpib Board Principles Of Operation A1 Front Panel Assembly A10 Control BoardSecondary Interface P/O A10 Board AC Calibration of Imon Principles Of Operation A4 AC Input Board A5 DC Rail Board ST Stage of the FET H-Bridge Configuration Output CircuitsPage Part Reference Designators Assembly SeeReading the Tables Part Description Abbreviations How to Order Parts Main Chassis, Replaceable PartsRef. Desig Agilent Part No Description SENSOR-MOISTURE TERM-BLK-4 POS Connector BUS BAR Buss BAR Block BUSS/FET Block FAN-TUBEAXIAL Phase Line ChokeFAN Finger Guard TRIM-SIDES A1 Front Panel Board, Replaceable Parts Front Panel Board LED Assy, Replaceable Parts Mechanical Parts CORE-SHLD-BEAD DIO-SWITCHINGDIO-PWR Rect CORE-MAGNETIC Q301, 302, 303 1855-0859 Replaceable Parts A4 AC Input Assembly, Replaceable Parts 10. A6 Bias Assembly, Replaceable Parts FU-SUBMIN 4A Heat SINK-TRANSISTOR 1854-0828 Assy Heat SINK-LM317T Regulator Assy XFMR- GpibXFMR-BIAS Heat SINK-UA7805UC Regulator Assy Wire KIT 12. A7 Fast Sense Assembly, Replaceable PartsFast Sense PC Assembly FU-SUBMIN 7A Power ModfetFU-SUBMIN 15A Xstr PNP Replaceable Parts C588 0160-4799 CAP 2.2pF 5% C589 6680A, 6681A DIO GEN PRP Phone ReceptableFET P-CHAN NETWORK-RES SIP Replaceable Parts Replaceable Parts RES 45K RES2.2M IC OP AMP RES 10KIC-REG TL7702BCP IC-VOLTAGE REG IC-CONVERTER,DIA PRGMD-IC, SECIC MC74HC138N IC-LINEAR Summary of Chapter Contents Function Description See Diagrams ANA0--ANA7 Signal Name Mnemonics Description A0--A15AD O--AD7 D0D7 AC Input Board DC Rail BoardBias Board CV Control Sheet A3 FET BoardA10 Control Board CC Control Sheet DP Control Sheet General Schematic NotesGeneral Schematic Notes Common Test Point Waveforms for Table Diagrams Circuit Board Cabling Diagram Diagrams Page A1 Front Panel Board, Schematic Diagram LED Board, Component and Test Point Location A2 Gpib Board, Component Location A2 Gpib Board, Schematic Diagram A3 FET Board, Component and Test Point Location 10. A3 FET Board, Schematic Diagram sheet 1 10. A3 FET Board, Schematic Diagram sheet 2 11. A4 AC Input Board, Component and Test Point Location 12. A4 AC Input Board, Schematic Diagram 13. A5 DC Rail Board, Component and Test Point Location 14. A5 DC Rail Board, Schematic Diagram 15. A6 Bias Board, Component and Test Point Location 16. A6 Bias Board, Schematic Diagram Sheet 1of 16. A6 Bias Board, Schematic Diagram Sheet 2 17. Power Mesh, Schematic Diagram, Models 6680A, 6681A Only Page 19. A7 Snubber Board, Component Location 21. A8 Fast Sense Board, Component Location 23. A9 Down Programming/Slow Sense, Component Location 24. A9 Down Programming/Slow Sense, Schematic Diagram 25. A10 Control Board, Component and Test Point Location 26. A10 Control Board, Schematic Diagram Sheet 1 26. A10 Control Board, Schematic Diagram Sheet 2 26. A10 Control Board, Schematic Diagram Sheet 3 26. A10 Control Board, Schematic Diagram Sheet 4 Model 6682A Serial Numbers Change Model 6680A Model 6683AModel 6681A Model 6684A Backdating -8 A4 AC Input Board -9 A5 DC Rail Board-14 Al0 Control Board -6 A2 Gpib Board Table A-1. A2 Gpib Parts List Ref Desig Agilent Part No Description IC Drom Gpib Figure A-1. A2 Gpib Component Parts List Backdating Index Index Error code Message 104 Signal name Troubleshooting

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