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Agilent Technologies 6681A, 6684A, 6680A, 6683A, 6682A service manual Output Held High Troubleshooting

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 3-6. Output Held High Troubleshooting

44 Troubleshooting

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Agilent Technologies 6681A, 6684A, 6680A, 6683A, 6682A service manual Output Held High Troubleshooting

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Contents

Agilent Part No Microfiche Part No September Certification Safety Considerations Symbol Description Safety Symbol DefinitionsPrinting History Table of Contents Backdating DiagramsPrinciples Of Operation Replaceable Parts Introduction Scope OrganizationInstrument Identification Chapter Description Change Sheet Related DocumentsManual Revisions Firmware Revisions Conventions Safety ConsiderationsElectrostatic Discharge Current-Monitoring Resistor IntroductionTests Test Equipment Required List of Equipment Electronic Load Programming Parameters Programming The Tests General ConsiderationsGeneral Measurement Techniques Performance Test Record Sheets Performance Tests Operation Verification TestsConstant Voltage CV Tests Constant Voltage CV Test Setup Verification CV Source Effect Constant Voltage CV Tests Action Normal ResultVoltage Programming and Readback Accuracy CV Load Effect CV Noise Pard Transient Response Waveform Verification Transient Recovery Time CC Noise Pard Constant Current CC TestsConstant Current CC Tests Action Normal Result Current Programming and Readback Accuracy CC Load Effect CC Source Effect CC Load Effect Test Setup Verification CC rms Noise Test Setup Verification Averaging the CC Measurements Test Facility Performance Test Record Form 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 Topic Information Given Introduction Localizing the ProblemTroubleshooting Chapter Organization Test Equipment Required Troubleshooting Procedures Power-On Selftest PRI Iram FP ROMEE Chksm PRI Xram Bias and Reference Supplies Troubleshooting ChartsTroubleshooting Test Points Chart Trouble or Circuit 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 Static Troubleshooting CV/CC Status Annunciators TroubleshootingA3 FET Board Troubleshooting FET Troubleshooting Chart Procedure Result 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 Valid A2U106 ROM Firmware Revision A.01.06 Primary Interface SA Test 16. Signature Analysis Connections, Sheet 1 Troubleshooting Valid A1U4 ROM Firmware Revision A.01.07 Valid A5U504 ROM Firmware Revision A.01.04 Secondary Interface SA Test Restoring Factory Calibration Constants Post-Repair Calibration When RequiredCalibration Password Inhibit Calibration Jumper Initialization I or Factory Preset Replacement F? F Initialization I or Factory Preset Replacement F?Eeprom Initialization Clear Screen END Select Case Else Case ElseEND if Stop 1530 END Disassembly ProceduresTools Required Return Removing Protective RFI Shield Galvanized Sheet Metal Top CoverGpib Board A3 FET Board A4 AC Input AssemblyA5 DC Rail Assembly A6 Bias Assembly A1 Front Panel Board A10 Control AssemblyFront Panel Assembly S1 Line Switch Output Bus Boards A7, A81 and A9 & Chassis Components A1DSP1 LCD DisplayA1G1 and A1G2 Rotary Controls A1KPD KeypadPage 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 Principles Of Operation A2 Gpib Board A10 Control Board A1 Front Panel AssemblySecondary Interface P/O A10 Board AC Calibration of Imon Principles Of Operation A5 DC Rail Board A4 AC Input Board Output Circuits ST Stage of the FET H-Bridge ConfigurationPage Part Description Abbreviations Assembly SeeReading the Tables Part Reference Designators Main Chassis, Replaceable Parts How to Order PartsRef. Desig Agilent Part No Description BUS BAR Buss BAR Block BUSS/FET Block SENSOR-MOISTURE TERM-BLK-4 POS Connector TRIM-SIDES Phase Line ChokeFAN Finger Guard FAN-TUBEAXIAL A1 Front Panel Board, Replaceable Parts Front Panel Board LED Assy, Replaceable Parts Mechanical Parts CORE-MAGNETIC DIO-SWITCHINGDIO-PWR Rect CORE-SHLD-BEAD Q301, 302, 303 1855-0859 Replaceable Parts A4 AC Input Assembly, Replaceable Parts 10. A6 Bias Assembly, Replaceable Parts Heat SINK-TRANSISTOR 1854-0828 Assy FU-SUBMIN 4A Heat SINK-UA7805UC Regulator Assy XFMR- GpibXFMR-BIAS Heat SINK-LM317T Regulator Assy 12. A7 Fast Sense Assembly, Replaceable Parts Wire KITFast Sense PC Assembly Xstr PNP Power ModfetFU-SUBMIN 15A FU-SUBMIN 7A 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 IC-VOLTAGE REG RES 10KIC-REG TL7702BCP IC OP AMP IC-LINEAR PRGMD-IC, SECIC MC74HC138N IC-CONVERTER,DIA Diagrams Summary of Chapter Contents Function Description See D0D7 Signal Name Mnemonics Description A0--A15AD O--AD7 ANA0--ANA7 DC Rail Board AC Input BoardBias Board CC Control Sheet A3 FET BoardA10 Control Board CV Control Sheet Common General Schematic NotesGeneral Schematic Notes DP Control Sheet 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 Backdating Serial Numbers Change Model 6680A Model 6683AModel 6681A Model 6684A Model 6682A -6 A2 Gpib Board -9 A5 DC Rail Board-14 Al0 Control Board -8 A4 AC Input Board Ref Desig Agilent Part No Description Table A-1. A2 Gpib Parts List 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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