Introduction - Fluke PM6690 Service Manual

Note: There are two variants of the main PCB, Version A and
Version B. Refer to page III for closer information.
Standard Parts
Electrical and mechanical replacement parts can be obtained
through your local service organization or representative. How-
ever, many of the standard components can be obtained from
other local suppliers. Before purchasing or ordering replace-
ments parts, check the parts list for value, tolerance, rating, and
description.
If the value of the physical component differs from what is de-
scribed in the parts list, you should always replace the part with
the same value as originally mounted.
NOTE: Physical size and shape of a compo-
nent may affect the performance of the
instrument, particularly at high frequencies.
Always use direct replacements unless it is
known that a substitute will not degrade the
performance of the instrument.
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Figure 8-1
Case.
8-2 Replacement Parts, Introduction

Introduction

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Special Parts
In addition to standard electronic components, the following
special components are used:
– Components that are manufactured or selected by Fluke to
meet specific performance requirements.
– Components that are important for the safety of the instru-
ment.
Both types of components may be replaced only by components
obtained through your local service organization.
Timebase reference oscillators, except those based on standard
crystals, cannot be repaired in the field but are replaced by
means of a factory exchange procedure. The same repair method
applies to the prescaler options.
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(inside)