Install guide

ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
CHAPTER 4
GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
Section 1. GENERAL
4-1. Scope. This section describes bench testing of the
computer, computer power supply, CDU, and power
supply.
4-2. Computer Bench Testing. Bench testing of the
computer consists of performing continuity checks
when broken or shorted wires are suspected of causing
a failure during performance of the self-test procedure.
A computer wire list (table 4-1) is provided for bench
testing. Refer to paragraph 4-6 for an explanation of
wire list format and notations. Figure 4-1 identifies
connector pins and terminal points on the computer.
4-3 Computer Power Supply Bench Testing. Bench
testing of the computer power supply consists of per-
forming continuity checks when broken or shorted
wires are suspected of causing a failure during perform-
ance of the self-test procedure. A schematic diagram of
the computer power supply (figure FO-5) and wiring
data (figure 4-16 and table 4-20) are provided for bench
testing.
4-4. CDU Bench Testing. Bench testing of the CDU
consists of performing continuity checks when broken
or shorted wires or failing switch or relay contacts are
suspected of causing a failure during performance of
the self-test procedure. A CDU wire list (table 4-2) is
provided for bench testing. Refer to paragraph 4-6 for
an explanation of wire list format and notations. Figure
4-2 identifies CDU connector pins and terminal points.
4-5. Power Supply Bench Testing. Bench testing of the
power supply consists of performing continuity checks
when broken wires or failing switch or relay contacts
are suspected of causing a failure during performance of
the self-test procedure. A schematic diagram (figure FO-
6) and wire lists (tables 4-3 and 4-4) are provided for
bench testing. Refer to paragraph 4-6 for an explanation
of wire list format and notations.
4-6. Wire List Format and Notations. Tables 4-1
through 4-4 contain wire lists for the computer, CDU,
power supply, and power supply harness assembly. The
following paragraphs define wire list format and nota-
tions.
a. Wire List Format. Information contained in the
wire list by column heading is described below:
Column
Signal
From Compo-
nent Pin
To Compo-
nent Pin
Ref
AWG
Type
Color
Definition
Numbers and letters appearing in
this column are signals and logic
terms and describe circuit functions
when practicable.
Entries in this column denote point
of origin.
Entries in this column denote point
of termination for items in the From
Component Pin column.
A unique suffix letter A, B, C, etc.
identifies each wire in a multiwire
connection. The suffix letter S de-
fines the shield of wire connected to
this pin, not the pin connection.
All wires, except those indicated, are
etched circuitry. Standard wire size
for table 4-3 is 22 AWG, except as
noted.
Symbols in this column specify con-
figuration of a wire or wires. In the
absence of a specific symbol,
stranded insulated wire is intended.
For flexible printed wiring, this col-
umn is not applicable.
Standard wire color is white for ta-
ble 4-3 except as specifically color-
coded. Numbers are coded to a
color as follows:
Number Color
o
Black
1
Brown
2 Red
3
Orange
4
Yellow
5
Green
6
Blue
7
Violet
4-1