HP 8901B

Model 8901B
Section 8
SERVICE
Service
8-1. INTRODUCTION TO THIS SECTION
This section contains information for troubleshooting and repairing the Modulation Analyzer. Included
are troubleshooting tests, block and schematic diagrams, and principles of operation.
8-2. HOW THE SECTION IS ORGANIZED
Section 8 is contained in this and two other volumes as:
Volume 2
0 General Service Information:
Safety Considerations
Service Tools and Aids
General Troubleshooting Information
Assembly and Service Sheet Cross Reference Index
Assembly Locations
Schematic Diagram Notes
Special Functions
Error Messages
Power-Up Checks
Controller Test LEDs and Test Points
Signature Analysis
e Service Aids:
0 Disassembly (for the front panel)
0 Block Diagram (BD) Theory and Troubleshooting
0 BD1 through BD5 Block Diagrams
The circuit descriptions and troubleshooting procedures for all the block diagrams.
Block Diagrams (foldouts)
for the Modulation Analyzer.
Volume 3
Schematic Diagram Theory and Troubleshooting
Circuit descriptions and troubleshooting procedures for Service Sheets (SS) 1 through 34.
Volume 4
e SS1 through SS35 Schematic Diagrams
SSASummary
e SSB and SSC Summary
Schematic Diagrams (foldouts) and Component Locator Diagrams for the Modulation Analyzer.
Service Special Functions and Error Message Summary.
Direct Control Special Function Summary.
8A- 1