Model
8901B
Replaceable
Parts
Section
6
REPLACEABLE PARTS
6-1.
INTRODUCTION TO THIS SECTION
This section contains information
for
ordering parts. Table
6-1
lists reference designations, and
Table
6-2
lists abbreviations that are used in the Replaceable Parts List. Table
6-3
lists all replaceable
parts in the instrument. Table
6-4
contains the names and addresses that correspond
to
the
manufacturer’s code numbers listed in Table
6-3.
Also included in this section are photographs and
drawings
to
aid in identifying and ordering chassis mounted parts and mechanical parts.
6-2.
REFERENCE DESIGNATIONS AND ABBREVIATIONS USED IN THIS MANUAL
Table
6-1
lists the reference designation letters for electrical parts in the instrument. The letter
designations found in Table
6-1
are coupled with numeric designations to provide a unique reference
designation for each part in the instrument.
For
example A17R1 is the reference designation
of
a
particular resistor
R1
on assembly A17.
Table
6-2
lists abbreviations used in the parts list and on schematics.
6-3.
REPLACEABLE PARTS LIST
Table
6-3
is
a list of replaceable parts and is organized
as
follows:
a.
Electrical assemblies and their components with reference designations in alphanumeric order.
b. Chassis-Mounted parts with reference designations in alphanumeric order.
c. Mechanical parts with reference designations in alphanumeric order.
For your convenience, the Replaceable Parts List
is
paginated so that each assembly listing can be
removed from Section
6
and collated into Section
8
with
its
corresponding service information.
Ordering
Parts.
instrument Serial Numbers.
Attached to the rear of the instrument
is
a serial-number plate. The first four digits and the letter
are the instrument serial-number prefix. The last five digits (serial-number suffix) are unique to each
instrument. When parts in the instrument are changed, the serial-number prefix of the instrument may
also
change. This means that sometimes a part will be listed more than once in the the replaceable
parts list along with a serial-number prefix
or
range of serial-number prefixes. Find the serial-number
prefix on the serial plate of your instrument and order the part listed under the corresponding prefix
in the table. If no serial prefix information is listed, the part is compatible
in
instruments of all serial
numbers.
NOTE
It is possible that some assemblies in your instrument have been updated
(through service
or
retrofitting) to reflect changes made to instruments with
serial-number prefixes later than that shown on your instrument serial-
number tag. Be sure to note the board number
of
the assembly being repaired
or
replaced when ordering parts
for
your instrument.
6-
1
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