Install guide

ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Cut length of 28 AWG stranded insulated
wire long enough to connect termination
points of damaged circuitry. Strip insulation
for a length of 1/8 inch at each end of wire.
Solder wire to terminations using standard
shop practices.
Tack wire to flexprint at one-inch-intervals
as follows:
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. Clean wire and flexprint tack points using
isopropyl alcohol.
2. Apply bonding primer (A4094) to tack
points on flexprint. Allow to air dry.
3. Apply adhesive (RTV 156 or 30-079) to
tack points on flexprint and wire, apply
sufficient pressure to ensure good bond.
(g) Replace memory unit (7 or 7.1).
(h) Replace circuit card assemblies (28 thru 36).
(i) Torque 16 screws (2) and washers (1) secur-
ing computer cover (3) to computer subas-
sembly (10) 16 inch-pounds using procedure
described in paragraph 3-11.
d. Computer Power Supply Repair. Computer
power supply repair consists of removal and replace-
ment of circuit card assemblies, guide pins, captive
screws, RFI gasket, and repair of the wiring harness.
Replacement of the guide pins and captive screws are
described in paragraph 3-15. Replacement of RFI gas-
kets is described in paragraph 3-13. See figure 4-15 for
an exploded view of the computer power supply. Refer
to table 4-21 for circuit card identification. Replace-
ment of the circuit card assemblies and repair of the
wiring harness is described in the following paragraph.
(1) 5V power supply circuit card assembly Al and
F&tier supply circuit card assembly A 2. Remove
and replace 5V ower supply circuit card assembly A1
(15, figure 4-15) or 15V power supply circuit card
assembly A2 (22) as follows:
(a) Removal.
NOTE
Removal of 5V power supply circuit card
assembly Al (15) and 15V power supply
circuit card assembly A2 (22) are identi-
cal, therefore, only 5V power supply cir-
cuit card assembly Al will be covered.
1. Loosen 10 captive screws (20) securing
end plate (19) to chassis (10); remove end
plate.
2, Loosen two screws (17) securing wedge-
locks (16) until 5V ower supply circuit
)
card assembly Al (15 is free.
NOTE
It may be necessary to loosen the wedges
if they become frozen. This can be done
by simply tapping the wedge screws
downward until the bottom wedges be-
come loose.
3. Loosen three captive screws (18) securing
5V power supply circuit card assembly
Al (15) heat sink to chassis (10).
4. Use a card extractor to remove 5V power
supply circuit card assembly Al (15).
(b) Replacement.
NOTE
Replacement of 5V power supply circuit
card assembly Al (15) and 15V power
supply circuit card assembly A2 (22) are
identical; therefore, only 5V power sup-
ply circuit card assembly Al will be cov-
ered.
1.
2.
3.
4.
Insert 5V power supply circuit card as-
sembly Al (15) into slot in chassis (10)
and carefully guide it into place.
Just before the connectors mate, check
that 5V power supply circuit card assem-
bly Al (15) is free in its guides and its top
edge is parallel to the chassis (10) top
surface.
Seat 5V power supply circuit card assem-
bly Al (15) by applying moderate, even
pressure at both corners. The top should
be flush with the chassis top surface. If
card does not readily seat, pull card out
and inspect for bent or broken connector
pins.
Tighten three captive screws (18) secur-
ing 5V power supply circuit card assem-
bly Al (15) heat sink to chassis (10).
4-134 Change 1