Replaceable Parts; Introduction To This Section; Reference Designations And Abbreviations Used In This Manual; Replaceable Parts List - HP 11848A Service Manual

Phase noise interface

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Model 11848A

Replaceable Parts

INTRODUCTION TO THIS SECTION

This section contains information for ordering parts. Table 3 lists reference designations, and Table 4

lists abbreviations that are used in the Replaceable Parts List. Table 5 lists all replaceable parts in

the instrument. Table 6 contains the names and addresses that correspond to the manufacturer's

code numbers listed in Table 5. Also included in this section are photographs and drawings to aid in

identifying and ordering chassis mounted parts and mechanical parts.

REFERENCE DESIGNATIONS AND ABBREVIATIONS USED IN THIS MANUAL

Table 3 lists the reference designation letters for electrical parts in the instrument. The letter

designations found in Table 3 are coupled with numeric designations to provide a unique reference

designation for each part in the instrument. For example A6R1 is the reference designation of a

particular resistor Rl on assembly A6.

Table 4 lists abbreviations used in the parts list and on schematics.

REPLACEABLE PARTS LIST

Table 5 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.

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

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