Install guide

ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Section IV. MAINTENANCE OF PADS
4-15. General.
a. Maintenance of PADS allocated to general sup-
port by MAC consists of testing and repair of computer,
computer power supply, control and display unit, iner-
tial measurement unit, and power supply.
4-16. Computer Maintenance.
Computer maintenance
consists of computer and computer power supply test-
ing and repair.
a. Computer Testing. Testing is performed using
the PADS test set as described in paragraph 4-9.
b. Computer Power Supply Testing. Testin is per-
formed using the power supply test set (PSTS as de-
scribed in paragraph 4-14.
c. Computer Repair. Computer repair consists of
replacing circuit card assemblies, memory unit, com-
puter power supply, RFI gasket, fault indicator, elapsed
time indicator and thermostatic switch, and repair of
flexible harness assembly. See figure 4-14 for an ex-
ploded view of the computer. Refer to table 3-5 for
circuit card identification.
NOTE
Removal and replacement of circuit
cards, memory unit, and computer power
supply are described in paragraph 3-15.
Torquing procedures are given in para-
graph 3-11.
(1) Fault indicator DS1. Remove and replace fault
indicator DS1 (21, figure 4-14) as follows:
(a) Removal.
1. Remove 16 screws (2) and washers (1)
securing computer cover (3) to computer
subassembly (10). Remove computer
cover.
2. Tag and unsolder wires connected to fault
indicator DS1 (21).
3. Remove nut (23) and lockwasher (22) se-
curing fault indicator DS1 (21) to com-
puter subassembly (10). Remove fault in-
dicator DS1.
(b) Replacement.
Isopropyl alcohol is flammable and gives
off harmful vapors. Use only in well-ven-
tilated area away from open flames and
sparks. Avoid prolonged or repeated inha-
lation of vapors.
1.
2.
3.
4.
5.
6.
Clean shoulder of fault indicator DS1 (21)
where it contacts computer subassembly
(10) using isopropyl alcohol and clean,
lint-free cloth. Repeat at least three times
using clean cloth each time. When clean,
wipe dry.
Apply adhesive (MIL-A-46146, Type 1)
0.010- to 0.030-inch thick on fault indica-
tor shoulder contact surface. Install fault
indicator DS 1 (21 ) in computer subassem-
bly (10) within 5 minutes after applying
adhesive.
Install nut (23) and lochwasher (22) secur-
ing fault indicator DS 1 (21 ) to computer
subassembly (lo) and tighten nut (23)
sufficiently to hold but not enough to
reduce the adhesive thickness to less than
().()1() inch.
Prepare and solder tagged wires to fault
indicator DS1 (21). Clean solder joints.
Place computer cover (3) on computer
subassembly (10); align mounting holes.
Torque 16 screws (2) and washers (1)
securing computer cover (3) to computer
subassembly (l0) 16 inch-pounds using
procedures described in paragraph 3-11.
(2) Elasped time indicator M1 Remove and re-
place elapsed time indicator M1 (25, figure 4-14) as
follows:
(a) Removal.
1.
2.
3.
Remove 16 screws (2) and washers (1)
securing computer cover (3) to computer
subassembly (10). Remove computer
cover.
Tag and unsolder wires connected to
elapsed time indicator M1 (25).
Remove two screws (27), spacers (26), and
one terminal lug (24) securing elapsed
time indicator M1 (25) to computer
subassembly (10). Remove elapsed time
indicator Ml.
(b) Replacement.
1. Install two screws (27), spacers (26), and
one terminal lug (24) securing elapsed
time indicator Ml (25) to computer
subassembly (10).
Change 1 4-131