Part C- Wire Tracing

Basic Schematic Interpretation
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1-45.

PART C - WIRE TRACING

In addition to being able to "read" the schematic diagram of a

circuit, it is often necessary to trace the source and/or the

destination of a signal coming into the circuit or exiting from it.

This is normally accomplished through a process of wire tracing.

Depending on the design and construction of the equipment, wire

tracing may be simple and confined to the internal parts of the

equipment; or it may be complex and extend to distant external

components.

Wire tracing procedures may vary greatly from one type of equipment

to another. Probably the key to success in wire tracing is to have

an understanding of the reference designators used to identify and

It is important to note that not all

systems use the same methodology for assigning reference designators.

Prior to performing wire tracing on actual equipment, refer to the

appropriate technical manual.

NOTE:

The following reference designator information is applicable

to the tank thermal sight (TTS), AN/VSG-2. The wire tracing

steps refer to the extracts from TM 9-5855-267-24 found in

appendix c. The wire tracing sequences found in this lesson

use table 3-2 of appendix C for solution.

These procedures

are for training only.

1. Reference Designators. Most equipment that requires the repairer

to trace signals from one unit to another have some type of reference

designator system.

These reference designators are assigned to

assist the repair technician in locating and identifying components

as necessary for testing and repair.

The TTS, AN/VSG-2 uses the system described below to assign reference

designators:

a. The first number in the reference designator represents the

major unit in which the component is located. The major units of the

TTS, AN/VSG-2 are:

(1) Head assembly.

(2) Gunner's display.

(3) Commander's display.

OD1725

Index