Install guide

ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
d.
e.
f.
g.
NOTE
Use silicone adhesive (RTV 156 or 30-
079) on IMU cover, computer cover,
computer/computer power supply, com-
puter power supply end plate, and power
supply bottom cover and side cover
gaskets.
Use silicone adhesive (MIL-A-46146,
Type I) on circuit breaker covers and
porro prism cover gaskets.
Apply a thin, even coat of silicone to mounting
surface.
Install gasket on mounting surface. Align holes.
Apply sufficient pressure to gasket to provide a
good bond and force out excess adhesive. Re-
move excessive adhesive.
Mate the subassembly to its counterpart, Tighten
the screws with moderate, even pressure, Do not
torque to final value until adhesive has cured for
24 hours.
3-15. Computer Maintenance. Repair of the computer
consists of removal and replacement of circuit cards,
memory unit, computer power supply, and radio fre-
quency interference (RF1) gasket, and repair of the
mount bracket, Figure 3-7 is an exploded view of the
computer.
a. Circuit Card Assembly. Remove and replace
circuit card assemblies A2 through A9 and All (20,
thru 28, figure 3-7) as follows:
When removing, replacing, or handling A/D
converter card assembly All, do not touch
connector pins or components on face of
card as damage to the assembly may result.
Ensure that assembly A11 is transported
in conductive bag with CAUTION label
identifying its contents as static-sensitive
device.
Prior to removal of assembly from pack-
aging, operator should discharge static
electricity by making arm contact with an
earth ground.
NOTE
Computer may remain in primary pallet
for card replacement.
(1) Removal
(a) Loosen 16 captive screws (2) and washers
(1) securing computer cover (3) to computer
subassembly (10); remove cover.
(b) Use card extractor to remove circuit card
assemblies (20 thru 28)
as shown in figure
3-8.
(2) Replacement.
NOTE
Circuit card assembly connectors are
keyed to prevent insertion of circuit card
assemblies in wrong connectors, Inspect
mating connectors for bent or broken pins
before inserting a new card.
(a) Install circuit card assemblies (20 thru 28,
figure 3-7) as follows:
1.
2.
3.
Insert card into card guide and carefully
guide it into place. If card jams, use card
extractor to pull it back out, Refer to
table 3-5 for card identification,
Just before the connectors mate, verify
card is free in its guides and its top edge
is parallel to the computer top surface.
Seat the card by applying moderate, even
pressure at both sides. The top should be
flush with the computer top surface. If
excessive insertion force is required or the
card extends above the computer, pull the
card out and inspect for bent or broken
connector pins.
(b) Inspect RFI gasket (29). Replace if cracked,
broken, loose or excessively compressed.
(c) Place computer cover (3) on computer
subassembly (10); align mounting holes.
(d) Engage 16 screws (2) and washers (1) secur-
ing com uter cover (3) to computer subas-
(
sembly 10) and torque to 16 inch-pounds
using procedures described in paragraph
3-11.
b. Memory Unit. Remove and replace memory unit
Al (7 or 7,1, figure 3-7) as follows:
When removing, replacing, or handling solid
state memory unit A1
(7), do not touch con-
nector pins or components on face of card
as damage to the memory may result.
Ensure that the memory is transported in
conductive bag with CAUTION label
identifying its contents as static-sensitive
device.
Prior to removal of the memory from
packaging, operator should discharge
static electricity by making arm contact
with earth ground.
3-28
Change 5