Agilent Technologies 6612B, Service Manual, Page: 7 / 74

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TROUBLESHOOTING 21
Introduction 21
Test Equipment Required 22
Overall Troubleshooting 22
Flow Charts 22
Specific Troubleshooting Procedures 33
Power-on Self-test Failures 36
CV/CC Status Annunciators Troubleshooting 37
Bias and Reference Supplies 37
J307 Voltage Measurements 38
Manual Fan Speed Control 39
Disabling Protection Features 39
Post-repair Calibration 40
Inhibit Calibration Switch 40
Calibration Password 40
Initialization 41
ROM Upgrade 41
Identifying the Firmware 41
Upgrade Procedure 41
Disassembly Procedures 42
List of Required Tools 42
Cover, Removal and Replacement 43
A2 Interface Board, Removal and Replacement 43
Front Panel Assembly, Removal and Replacement 43
A3 Front Panel Board, Removal and Replacement 44
A1 Main Control Board 44
T1 Power Transformer, Removal and Replacement 44
Line Voltage Wiring 44
PRINCIPLES OF OPERATION 47
Introduction 47
I/O Interface Signals 47
A3 Front Panel Circuits 48
A2 Interface Circuits 48
Primary Interface 48
Secondary Interface 48
A1 Main Board Circuits 50
Power Circuits 50
Control Circuits 52
REPLACEABLE PARTS LIST 55
Introduction 55
DIAGRAMS 65
Introduction 65
General Schematic Notes 65
Backdating 65
INDEX 73