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TDS 420A, TDS 430A & TDS 460A Service Manual
Introduction
This section contains general information critical to safe and effective servicing
of this oscilloscope, the manual service strategy, and a description of repair and
warranty services available from Tektronix.
Before Servicing
This manual is for servicing the TDS 420A, TDS 430A, & TDS 460A Digitizing
Oscilloscopes. To prevent injury to yourself or damage to the oscilloscope, do
the following before you attempt service:
H Be sure you are a qualified service person.
H Read the safety summaries found at the beginning of this manual.
H Read Strategy for Servicing and Supplying Operating Pow er in
this subsection.
When using this manual for servicing, be sure to heed all warnings, cautions,
and notes.
STOP. If servicing a T DS 430A, follow the procedures for the TDS 420A, but
ignore all references to CH 3 and CH 4.
Strategy for Servicing
STOP. Throughout this manual, any field-replaceable component, assembly, or
part of this oscilloscope is referred to generically as a module.
This manual contains all the information needed for periodic maintenance of
your oscilloscope. (Examples of such information are procedures for checking
performance and for readjustment.) Further, it contains all information for
corrective maintenance down to the module level. This means that the proce-
dures, diagrams, and other troubleshooting aids help isolate failures to a specific
module, rather than to components of that module. Once a failure is isolated,
replace the module with a fully tested module obtained from the factory.
All modules are listed in Chapter 10, Mechanical Parts List. To isolate a failure
to a module, use the fault isolation procedures found in Chapter 6, Maintenance.
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