Service manual

14 1

General Information

Organization of Service Manual

This manual consists of the major chapters listed below. This section describes the names

of the chapters and the content of each chapter.

• Performance Test provides procedures for performance testing the 4294A.

• Adjustment provides procedures for adjusting the 4294A after repair or replacement of

an assembly. Most of the adjustments update the correction constants stored into the

EEPROM on the A1 CPU. The correction constants are updated by using the

adjustment program.

• Troubleshooting provides troubleshooting procedures to isolate any faulty functional

group or faulty assembly. Faulty assembly isolation procedures for the faulty functional

group follow this chapter.

• Power Supply Troubleshooting provides troubleshooting procedures to isolate any

faulty assembly within the power supply functional group.

• Digital Control Troubleshooting provides troubleshooting procedures to isolate any

faulty assembly within the digital control functional group.

• Service Related Menus documents the functions of the menus accessed from [System],

DIAGNOSTIC TEST. These menus are used to test, verify, and troubleshoot the 4294A.

• Theory of Operation explains the overall operation of the 4294A, the division into

functional groups, and the operation of each functional group.

• Parts Replacement provides part numbers and illustrations of the replaceable

assemblies and miscellaneous chassis parts. This chapter also provides procedures to

disassemble portions of the analyzer when certain assemblies have to be replaced.

• Post Repair Procedures contains the table of related service procedures. It is a table of

adjustments and verification procedures to be performed after repair or replacement of

each assembly.

• Appendices contains manual change information (required to make this manual

compatible with earlier shipment configurations of the analyzer), power requirements

and error messages of the analyzer.