Install guide

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