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Agilent Technologies 6680A, 6684A, 6683A, 6681A, 6682A Output Held Low Troubleshooting Sheet 1

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

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

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Figure 3-5. Output Held Low Troubleshooting (Sheet 1 of 2)

42 Troubleshooting

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Agilent Technologies 6680A, 6684A, 6683A, 6681A, 6682A service manual Output Held Low Troubleshooting Sheet 1

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Contents

Agilent Part No Microfiche Part No September Certification Safety Considerations Printing History Safety Symbol DefinitionsSymbol Description Table of Contents Principles Of Operation DiagramsReplaceable Parts Backdating Instrument Identification Scope OrganizationChapter Description Introduction Manual Revisions Related DocumentsFirmware Revisions Change Sheet Electrostatic Discharge Safety ConsiderationsConventions Tests IntroductionTest Equipment Required List of Equipment Current-Monitoring Resistor Electronic Load General Measurement Techniques Programming The Tests General ConsiderationsPerformance Test Record Sheets Programming Parameters Constant Voltage CV Tests Operation Verification TestsPerformance Tests Constant Voltage CV Test Setup Verification Voltage Programming and Readback Accuracy Constant Voltage CV Tests Action Normal ResultCV Load Effect CV Source Effect CV Noise Pard Transient Response Waveform Verification Transient Recovery Time Constant Current CC Tests Action Normal Result Constant Current CC TestsCurrent 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 Test Facility Performance Test Record Form Uncertainty ResultsSpec Vout 0.5mV Vout + 0.5mV 900 nV Vout 1mV Vout + 1mV Vout 1.7mV Vout + 1.7mV Vout 2.3mV Vout + 2.3mV Troubleshooting Introduction Localizing the ProblemChapter Organization Topic Information Given Test Equipment Required Troubleshooting Procedures Power-On Selftest EE Chksm FP ROMPRI Xram PRI Iram Troubleshooting Test Points Troubleshooting ChartsChart 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 A3 FET Board Troubleshooting CV/CC Status Annunciators TroubleshootingFET Troubleshooting Chart Procedure Result Static Troubleshooting Dynamic Troubleshooting 13. A3 FET Board Test Waveforms Troubleshooting Agilent Technologies ,6681A,O,fA.01.05sA.01.04pA.0l.02 Signature Analysis IntroductionAllocate L$52 Output 705*IDN? Enter 705L$ Disp L$ 50 END Test Headers Pins DescriptionFront Panel Test Connector A1J3 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 Calibration Password Post-Repair Calibration When RequiredInhibit Calibration Jumper Restoring Factory Calibration Constants Eeprom Initialization Initialization I or Factory Preset Replacement F?Initialization I or Factory Preset Replacement F? F Clear Screen END Select Case Else END if ElseStop Case 1530 Tools Required Disassembly ProceduresReturn END Gpib Board Top CoverRemoving Protective RFI Shield Galvanized Sheet Metal A5 DC Rail Assembly A4 AC Input AssemblyA6 Bias Assembly A3 FET Board Front Panel Assembly A10 Control AssemblyS1 Line Switch A1 Front Panel Board A1G1 and A1G2 Rotary Controls A1DSP1 LCD DisplayA1KPD 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 Principles Of Operation A2 Gpib Board Secondary Interface P/O A10 Board A1 Front Panel AssemblyA10 Control 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 Reading the Tables Assembly SeePart Reference Designators Part Description Abbreviations Ref. Desig Agilent Part No Description How to Order PartsMain Chassis, Replaceable Parts BUS BAR Buss BAR Block BUSS/FET Block SENSOR-MOISTURE TERM-BLK-4 POS Connector FAN Finger Guard Phase Line ChokeFAN-TUBEAXIAL TRIM-SIDES A1 Front Panel Board, Replaceable Parts Front Panel Board LED Assy, Replaceable Parts Mechanical Parts DIO-PWR Rect DIO-SWITCHINGCORE-SHLD-BEAD CORE-MAGNETIC 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 XFMR-BIAS XFMR- GpibHeat SINK-LM317T Regulator Assy Heat SINK-UA7805UC Regulator Assy Fast Sense PC Assembly Wire KIT12. A7 Fast Sense Assembly, Replaceable Parts FU-SUBMIN 15A Power ModfetFU-SUBMIN 7A Xstr PNP Replaceable Parts C588 0160-4799 CAP 2.2pF 5% C589 6680A, 6681A FET P-CHAN DIO GEN PRPPhone Receptable NETWORK-RES SIP Replaceable Parts Replaceable Parts RES 45K RES2.2M IC-REG TL7702BCP RES 10KIC OP AMP IC-VOLTAGE REG IC MC74HC138N PRGMD-IC, SECIC-CONVERTER,DIA IC-LINEAR Diagrams Summary of Chapter Contents Function Description See AD O--AD7 Signal Name Mnemonics Description A0--A15ANA0--ANA7 D0D7 Bias Board AC Input BoardDC Rail Board A10 Control Board A3 FET 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 Model 6681A Model 6684A Serial Numbers Change Model 6680A Model 6683AModel 6682A Backdating -14 Al0 Control Board -9 A5 DC Rail Board-8 A4 AC Input Board -6 A2 Gpib 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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