Chapter 8. GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

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CHAPTER 8

GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

Section I. GENERAL

8-1. Scope of General Support Maintenance. General

support maintenance consists of bench testing the PSTS

Definition

Column

and cable assemblies, preventive maintenance checks

and services, testing and troubleshooting the PSTS,

Numbers of letters appearing in this

Signal

removal and replacement of PSTS components, and

column are used for logic terms and

repair of cable assemblies.

signal identification and are assigned

per their respective circuit func-

8-2. PSTS Bench Testing. Bench testing of the PSTS

tions.

consists of performing continuity checks when broken

or shorted wires, or failing switch or relay contacts are

From Compo-

Entries in this column denote point

suspected of causing a failure during operation of the

nent Pin

of origin.

equipment. A schematic diagram of the PSTS (Figure

To Compo-

Entries in this column denote point

FO-2) is provided for bench testing. A PSTS wire list

of termination for items in the From

nent Pin

(table 8-1) is also provided for bench testing. Refer to

Component Pin column.

paragraph 8-5 for an explanation of wire list format and

notations. Out of circuit resistance values for transistors

Ref

The suffix letter A, B, C, etc., defines

and diodes are shown in figures 8-1 and 8-2, respec-

which of several wires attached to

tively. Relay pin diagrams are shown in figure 8-3.

the same pin is intended. The suffix

Shown in figure 8-3A is a diagram of the pin arrange-

letter S defines the shield of wire

ment for connectors J2 and J3.

connected to this pin.

AWG

Standard wire size is 22 gauge, ex-

8-3. Cable Assemblies Bench Testing. Bench testing of

cept as noted.

the cable assemblies consists of performing a point-to-

point continuity check and testing for shorts between

Type

Symbols in this column specify con-

connector pins and between pins and connector back-

figuration of a wire or wires. In the

shells. A wire list (table 8-2) is provided for an explana-

a b s e n c e of a specific symbol,

tion of wire list format and notations.

stranded insulated wire is intended.

For flexible printed wiring, this col-

8-4. Preventive Maintenance Checks and Services. To

umn is not applicable.

ensure that the PSTS is always ready for operation, the

Standard wire color is white except

Color

preventive maintenance checks and services must be

as specifically color-coded. Numbers

performed as outlined in table 8-3.

are coded to a color as follows:

8-5. Wire List Format and Notations. Tables 8-1 and

Color

Number

8-2 contain wire lists for the PSTS and cable assemblies,

Black

respectively. The following paragraphs define wire list

format and notations.

Brown

a. Wire List Format. The wire list column head-

Red

ings, from left to right, are listed with their respective

Orange

entries defined as follows:

Yellow

Green

Blue

Violet

Gray

8-1