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Agilent Technologies 6682A, 6684A, 6680A, 6683A, 6681A service manual A2 Gpib Board, Schematic Diagram

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 6-8. A2 GPIB Board, Schematic Diagram

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Agilent Technologies 6682A, 6684A, 6680A, 6683A, 6681A service manual A2 Gpib Board, Schematic Diagram

Page 123 Page 125

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Contents

Agilent Part No Microfiche Part No September Certification Safety Considerations Symbol Description Safety Symbol DefinitionsPrinting History Table of Contents Diagrams Principles Of OperationReplaceable Parts Backdating Scope Organization Instrument IdentificationChapter Description Introduction Related Documents Manual RevisionsFirmware Revisions Change Sheet Conventions Safety ConsiderationsElectrostatic Discharge Introduction TestsTest Equipment Required List of Equipment Current-Monitoring Resistor Electronic Load Programming The Tests General Considerations General Measurement TechniquesPerformance Test Record Sheets Programming Parameters Performance Tests Operation Verification TestsConstant Voltage CV Tests Constant Voltage CV Test Setup Verification Constant Voltage CV Tests Action Normal Result Voltage Programming and Readback AccuracyCV Load Effect CV Source Effect CV Noise Pard Transient Recovery Time Transient Response Waveform Verification Constant Current CC Tests Constant Current CC Tests Action Normal ResultCurrent Programming and Readback Accuracy 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 Spec ResultsUncertainty Vout 0.5mV Vout + 0.5mV 900 nV Vout 1mV Vout + 1mV Vout 1.7mV Vout + 1.7mV Vout 2.3mV Vout + 2.3mV Introduction Localizing the Problem TroubleshootingChapter Organization Topic Information Given Troubleshooting Procedures Power-On Selftest Test Equipment Required FP ROM EE ChksmPRI Xram PRI Iram Troubleshooting Charts Troubleshooting Test PointsChart Trouble or Circuit 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 CV/CC Status Annunciators Troubleshooting A3 FET Board TroubleshootingFET Troubleshooting Chart Procedure Result Static Troubleshooting Dynamic Troubleshooting 13. A3 FET Board Test Waveforms Troubleshooting Allocate L$52 Output 705*IDN? Enter 705L$ Disp L$ 50 END Signature Analysis IntroductionAgilent Technologies ,6681A,O,fA.01.05sA.01.04pA.0l.02 Front Panel Test Connector A1J3 Pins DescriptionTest 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 Post-Repair Calibration When Required Calibration PasswordInhibit Calibration Jumper Restoring Factory Calibration Constants Initialization I or Factory Preset Replacement F? F Initialization I or Factory Preset Replacement F?Eeprom Initialization Clear Screen Case Else END Select Else END ifStop Case 1530 Disassembly Procedures Tools RequiredReturn END Removing Protective RFI Shield Galvanized Sheet Metal Top CoverGpib Board A4 AC Input Assembly A5 DC Rail AssemblyA6 Bias Assembly A3 FET Board A10 Control Assembly Front Panel AssemblyS1 Line Switch A1 Front Panel Board A1DSP1 LCD Display A1G1 and A1G2 Rotary ControlsA1KPD Keypad 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 A10 Control Board A1 Front Panel AssemblySecondary 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 Assembly See Reading the TablesPart Reference Designators Part Description Abbreviations Main Chassis, Replaceable Parts How to Order PartsRef. Desig Agilent Part No Description SENSOR-MOISTURE TERM-BLK-4 POS Connector BUS BAR Buss BAR Block BUSS/FET Block Phase Line Choke FAN Finger GuardFAN-TUBEAXIAL TRIM-SIDES A1 Front Panel Board, Replaceable Parts Front Panel Board LED Assy, Replaceable Parts Mechanical Parts DIO-SWITCHING DIO-PWR RectCORE-SHLD-BEAD 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 XFMR- Gpib XFMR-BIASHeat SINK-LM317T Regulator Assy Heat SINK-UA7805UC Regulator Assy 12. A7 Fast Sense Assembly, Replaceable Parts Wire KITFast Sense PC Assembly Power Modfet FU-SUBMIN 15AFU-SUBMIN 7A Xstr PNP Replaceable Parts C588 0160-4799 CAP 2.2pF 5% C589 6680A, 6681A Phone Receptable DIO GEN PRPFET P-CHAN NETWORK-RES SIP Replaceable Parts Replaceable Parts RES 45K RES2.2M RES 10K IC-REG TL7702BCPIC OP AMP IC-VOLTAGE REG PRGMD-IC, SEC IC MC74HC138NIC-CONVERTER,DIA IC-LINEAR Summary of Chapter Contents Function Description See Diagrams Signal Name Mnemonics Description A0--A15 AD O--AD7ANA0--ANA7 D0D7 DC Rail Board AC Input BoardBias Board A3 FET Board A10 Control BoardCV Control Sheet CC Control Sheet General Schematic Notes General Schematic NotesDP Control Sheet 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 Serial Numbers Change Model 6680A Model 6683A Model 6681A Model 6684AModel 6682A Backdating -9 A5 DC Rail Board -14 Al0 Control Board-8 A4 AC Input 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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