TDS 420A, TDS 430A & TDS 460A Service Manual
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Preface
This service manual provides service information for the TDS 420A, TDS 430A,
and TDS 460A Digitizing Oscilloscopes.
STOP. If servicing a T DS 430A, follow the procedures for the TDS 460A, but
ignore all references to CH 3 and CH 4.
Manual Structure
This manual is divided into Chapters such as Specifications and Theory of
Operation. Further, it is divided into subsections such as Product Description
and Removal and Installation Procedures.
Sections containing procedures also contain introductions to those procedures.
Be sure to read these introductions because they provide information needed to
do the service correctly and efficiently. A brief description of each manual
chapter follows:
H Specifications contains a product description of the digitizing oscilloscope
and tables of the characteristics and descriptions that apply to it.
H Operating Information is this chapter. It includes a description of how this
manual is structured as well as general information and operating instruc-
tions at the level needed to safely power on and service this oscilloscope. A
statement of the service strategy that this manual supports and instructions
for shipment of the digitizing oscilloscope are found in this chapter.
H Theory of Operation contains circuit descriptions that support general service
and fault isolation.
H Performance Verification contains a collection of procedures for confirming
that this digitizing oscilloscope functions properly and meets warranted
limits.
H Adjustment Procedures contains a collection of procedures for adjusting this
digitizing oscilloscope to meet warranted limits.
H Maintenance contains information and procedures for doing preventive and
corrective maintenance of the digitizing oscilloscope. Instructions for
cleaning, for module removal and installation, and for fault isolation to a
module are found here.
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