ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
porro prism cover. Figure 3-10 is an exploded view of
(b) Apply sealing compound primer (MIL-
the IMU.
S-22473) to male threads of retainer nut.
(c) After primer has dried, apply sealing com-
a. Bolt Assembly. Remove and replace bolt assem-
pound (MIL-S-22473, Grade C) to male
bly (21, figure 3-10) as follows:
threads of retainer nut. Sealing compound
(1) Removal.
shall cover the full engaging length of one
of the mating components; assemble parts.
(a) Remove retainer nut (19) securing bolt as-
sembly (21) to lower IMU subassembly (13).
(b) Remove bolt assembly (21). Retain two
moval and replacement of circuit card assemblies. Fig-
washers (20) for reassembly.
(2) Replacement.
a. Display Logic Circuit Card Assemblies Al and
A2 and Keybord and Control Circuit Card Assembly A3.
Remove and replace display logic circuit card assembly
Al or A2 (4 or 5, figure 3-9) or keyboard and control
circuit card assembly A3 (6) as follows:
(1) Removal.
Isopropyl alcohol is flammable and gives
(a) Remove 16 screws (1) and washers (2) secur-
off harmful vapors. Use only in well-ven-
ing control and display panel (3) to control
tilated area away from open flames and
and display unit cover (7). Separate control
sparks. Avoid prolonged or repeated inha-
and display unit cover (7) and control and
lation of vapors.
display panel (3) to provide access to circuit
card assemblies,
Clean bolt assembly (21) threads using iso-
(a)
propyl alcohol and clean, lint-free cloth;
(b) Using card extractor, remove display logic
wipe dry.
circuit card assembly Al (4), A2 (5), or
keyboard and control circuit card assembly
Place washers (20) on bolt assembly (21);
(b)
A3 (6) as applicable.
insert bolt assembly (21) through mounting
(2) Replacement.
hole.
(a) Insert card into guide and carefully guide it
Apply sealing compound primer (MIL-
(c)
into place. If card jams, pull it back out
S-22473) to bolt assembly (21) threads; al-
with card extractor. Refer to table 3-6 for
low to dry.
card identification.
Apply sealing compound (MIL-S-22473,
(d)
(b) Just before the connectors mate, check that
Grade C) to bolt assembly (21) threads,
card is free in its guides and its top edge is
Install retainer nut (19) securing bolt assem-
parallel to the CDU top surface.
(e)
bly (21) to lower IMU subassembly (13).
(c) Seat card by applying moderate even pres-
Torque retainer nut 10 to 12 inch-pounds.
sure at both sides. If excessive insertion
force is required or the card is not fully
b. Guide Pin. Remove and replace guide pin (14,
seated, remove the card and inspect for bent
figure follows:
or broken connector pins.
(1) Removal. Unscrew guide pin (14) from lower
(d) Inspect gasket (8). Replace if cracked, tom,
IMU subassembly (13).
loose, or excessively compressed.
(2) Replacement.
(e) Place control and display panel (3) against
control and display unit cover (7). Secure
control and display panel (3) to control and
display unit cover with 16 screws (1) and
washers (2) and torque to 5 inch-pounds
using procedures described in paragraph
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-
removal and replacement of bolt assemblies, guide pin,
lation of vapors.
thermostatic switch, and repair of the IMU cover and
3-33
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