ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Legend for Figure 4-18
14. Guide pin
1.
Screw
15. Porro prism cover
2.
Washer
16. Screw
3.
Cover plate
17. Washer
Thermostatic switch S3
4.
18. Clamping catch
Capacitor C3
5.
19. Porro prism
Capacitor C4
6.
20. Lockwasher
Gasket
7.
21. Screw
8.
Screw
22. Retainer nut
Clamping catch
9.
23. Washer
Washer
10.
24. Bolt assembly
Nut
11.
25. IMU cover
Upper IMU subassembly
12.
13.
Lower IMU subassembly
Tighten four captive screws (51) securing
4.
gasket (46) to chassis (22); remove cover
card (52) to chassis (22).
and gasket.
2. Loosen four captive screws (51) securing
Ti hten four screws (53) in wedgelocks
5.
+ 17V converter-regulator circuit card
(54) until wedges are tight against edge of
assembly Al (52) to chassis (22).
slots.
3. Loosen four screws (53) securing wedge-
Secure bottom cover (45) and gasket (46)
6.
locks (54) until + 17V converter-regulator
to chassis (22) with 25 captive screws (43)
circuit card assembly Al (52) is free.
and washers (44). Torque screws to 9
inch-pounds using procedures described
NOTE
It may be necessary to loosen the wedges
(2) + 20V converter-regulator circit card assembly
if they become frozen, This can be done
A2. Remove and replace + 20V converter-regulator
by simply tapping the wedge screws
circuit card assembly A2 (50, figure 4-19, sheet 3) as
downward until the bottom wedges be-
follows.
come loose,
(a) Removal.
4. Remove + 17V converter-regulator cir-
cuit card assembly Al (52) from chassis
Loosen 25 captive screws (43) and wash-
1.
(22).
ers (43) securing bottom cover (45) and
gasket (46) to chassis (22); remove cover
(b) Replacement.
and gasket.
1.
Insert + 17V converter-regulator circuit
Loosen four captive screws (49) securing
2.
card assembly Al (52) into slot in chassis
+ 20V converter-regulator circuit card
(22) and carefully guide it into place.
assembly A2 (50) to chassis (22).
2. Just before the connectors mate, check
Loosen four screws (48) securing wedge-
3.
that + 17V converter-regulator circuit
locks (47) until + 20V converter-regulator
card assembly Al (52) is free in its guides
circuit card assembly A2 (50) is free.
and its top edge is parallel to the chassis
(22) top surface.
NOTE
3. Seat + 17V conveter-regulator circuit
It may be necessary to loosen the wedges
card assembly Al (52) by applying moder-
if they become frozen. This can be done
ate, even pressure at both comers. If card
by simply tapping the wedge screws
does not readily seat, pull the card out
downward until the bottom wedges be-
and inspect for bent or broken connector
come loose.
pins.
4-147
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