Chapter 6 Service
Operating Checklist 111
Types of Service Available 112
Repackaging for Shipment 113
Electrostatic Discharge (ESD) Precautions 114
Surface Mount Repair 114
To Replace the Power-Line Fuse 114
To Replace The Current Input Fuses 115
To Connect Pass/Fail Output Signals 115
Troubleshooting Hints 117
Self-Test Procedures 120
Chapter 7 Replaceable Parts
To Order Replaceable Parts 126
Backdating and Part Changes 126
Replaceable Parts: 34401-66501 (Main Assembly) 127
Replaceable Parts: 34401-66512 (Display Assembly) 133
Replaceable Parts: Agilent 34401A Mainframe 134
Manufacturer’s List 135
Chapter 8 Backdating 137
Chapter 9 Schematics
Mechanical Disassembly 9-3
Component Locator Diagram – Main Board (34401-66501) 9-5
Component Locator Diagram – Front Panel (34401-66512) 9-6
Agilent 34401A Block Diagram 9-7
Front/Rear Selection Schematic 9-8
Function Switching Schematic 9-9
DC Amplifier and Ohms Schematic 9-10
AC Circuit Schematic 9-11
A/D Converter Schematic 9-12
Floating Logic Schematic 9-13
Earth-Referenced Logic Schematic 9-14
Power Supplies Schematic 9-15
Front-Panel Display Schematic 9-16
Contents
Contents
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