Install guide

ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
downward until the bottom wedges be-
come loose.
3. Loosen six captive screws (18) securing
5V ower supply circuit card assembly
A1 (15) and 15V power supply circuit
card assembly A2 (22) heat sinks to chas-
sis (10).
4. Use a card extractor to remove 5V power
supply circuit card assembly A1 (15) and
15V power supply circuit card assembly
A2 (22).
5. Remove 14 screws (1) and washers (2)
securing cover (3) to chassis (10); remove
cover.
6. Remove two screws (6), washers (7), and
spacers (8), four screws (11) and washers
(12), and nut (9) securing wiring harness
A3 (5) to chassis (9); carefuly remove
wiring harness A3.
(b) Repair. Repair of the wiring harness A3 (5)
consists of replacing damaged wires and components.
See figure 4-16 and table 4-22 and replace damaged
wiring and components using standard shop practices.
(c) Replacement.
1. Install wiring harness A3 (5) in chassis
(10) and loosely attach with four screws
(11) and washers (12).
2. Insert 5V power supply circuit card as-
sembly A1 (15) into slot in chassis
(10)
and carefully guide it into place.
3. Just before the connectors mate, check
that 5V power supply circuit card assem-
bly A1 (15) is free and its guides and its
top edge is parallel to the chassis (10) top
surface.
4. Seat 5V power supply circuit card assem-
bly A1 (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 the card
out and inspect for bent or broken con-
nector pins.
5. Tighten two screws (17) in wedgelock
(16) until wedge is tight against edge of
slot. Allow wiring harness A3 (5) to seek
its optimum position when
wedgelocks
are tightened 4 to 5 inch-pounds.
6. Tighten top two screws (11) securing wir-
ing harness (5) to chassis (10) while hold-
ing card (15).
7. Loosen two screws (17) securing wedge-
locks (16) until 5V power supply circuit
card assembly A1 (15) is loose.
8. Use a card extractor to remove 5V power
supply circuit card assembly A1 (15).
9. Tighten remaining two screws (11) secur-
ing wiring harness (5) to chassis (10).
10. Finish securing wiring harness A3 (5) to
chassis (10) with two screws (6), washers (7),
and spacers (8), and nut (9). Apply sealing
compound (MIL-S-22473, Grade C) to
threads of screws (6). Tighten nut 110 to 120
inch-pounds. Check electrical bonding be-
tween nut and chassis (10) with an ohm-
meter. Resistance should be 2.5 milliohms
maximum.
11. Insert 5V power supply circuit card as-
sembly A1 (15) and 15V
power supply
circuit card assembly A2 (22) into their
respective slots in chassis (10) and care-
fuly guide them into place.
12. Just before the connectors mate, check
that 5V power supply circuit card assem-
bly A1 (15) and 15V power supply circuit
card assembly
A2 (22) are free in their
respective guides and top edges are paral-
lel to the chassis (10).
13. Seat 5V power supply circuit card assem-
bly A1 (15) and 15V power supply circuit
card assembly A2 (22) by applying moder-
ate, even pressure at both corners of each
card. The top should be flush with the
chassis top surface.
If 5V power supply
circuit card assembly A1 (15) or 15V
power supply circuit card assembly A2
(22) does not readily seat, pull the card
out and inspect for bent or broken con-
nector pins.
14. Tighten six captive screws (18) securing
5V power supply circuit card assembly
A1 (15) and 15V power supply circuit
card assembly A2 (22) heat sinks to chas-
sis (10).
15. Tighten four screws (17) in wedgelocks
(16) of 5V
power supply circuit card as-
sembly A1 (15) and 15V power supply
circuit card assembly A1 (22) until wedge
is tight against edge of slot.
16. Inspect gasket (21) on end plate (19).
Replace if cracked,
torn, or
excessively
compressed.
17. Secure end plate (19) to chassis (10) with
10 captive screws (20).
18. Secure cover (3) to chassis (10) with 14
screws (1) and washers (2).
Change 5
4-137