TDS 420A, TDS 430A & TDS 460A Service Manual
6-1
Maintenance
This chapter contains the information needed to do periodic and corrective
maintenance on the TDS 420A, TDS 430A, & TDS 460A Digitizing Oscillo-
scopes. Specifically, the following sections are included:
H Preparation — General information on preventing damage to internal
modules when doing maintenance.
H Inspection and Cleaning — Information and procedures for inspecting the
oscilloscope and cleaning its external and internal modules.
H Removal and Installation Procedures — Procedures for the removal of
defective modules and replacement of new or repaired modules. Also
included is a procedure for disassembly of the oscilloscope for cleaning.
H Troubleshooting — Information for isolating failed modules. Included are
instructions for operating the internal diagnostic routines and troubleshooting
trees. Most of the trees make use of these internal diagnostic routines to
speed fault isolation to a module.
Service personnel must be prepared to safely service the oscilloscope. This
manual is for qualified service personnel only. Read the General Safety Summary
and the Service Safety Summary at the front of this manual. If you are unfamiliar
with the operation of this oscilloscope, read Operating Information (Chapter 2)
before servicing the oscilloscope. To prevent electro-static damage (ESD), read
Preventing ESD, on page 6--2, before servicing the oscilloscope.
Related Maintenance Procedures
The following chapters contain information and procedures related to doing
maintenance.
H Chapter 2, Operating Information, covers instructions useful when operating
the oscilloscope in order to troubleshoot it. The chapter also details the
service strategy and lists options for obtaining maintenance service and for
replacing failed modules.
H Chapter 3, Theory of Operation, contains a circuit description at the module,
or block, level.
H Chapter 4, Performance Verification, contains procedures that are useful in
isolating problems to modules by testing oscilloscope performance.
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