Install guide

control circuit card assembly A3 (8) follow-
ing procedures described in 3-17a(l).
(b) Repair.
1.
2.
3.
Cut length of 28 AWG stranded insulated
wire long enough to connect termination
points of darnaged circuitry. Strip insula-
tion for a length of 1/8 inch at each end
of wire.
Solder wire to termination using standard
shop practices.
Tack wire to flexprint at one-inch-inter-
vals in accordance with the following
steps.
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-
lation of vapors.
4. Clean wire and flexprint tack points using
isopropyl alcohol,
5. Applying bonding primer (A4094) to tack
points on flexprint. Allow to air dry.
6. Apply adhesive (RTV 156 or 30-079) to
tack points on flexprint and wire. Apply
sufficient pressure to ensure good bond.
(c) Replacement. Install display logic circuit
card assemblies Al (6) and A2 (7) and keyboard and
control circuit card assembly A3 (8) and reassemble
control display unit following procedures described in
3-17a(2).
.
4-18. IMU Maintenance.
a. IMU Testing. Testing is performed using PADS
test set as described
in paragraph 4-11.
b. IMU Repair. IMU repair allocated to general
support by the MAC consists of replacing the porro
prism. Alignment of porro prism after replacement is
described in paragraph 4-11. Figure 4-18 is an exploded
view of the IMU.
(1) Porro prism assembly. Remove and replace
porro prism assembly (19, figure 4-18) as follows:
(a) Removal.
1. Release two clamping catches (18) secur-
ing porro prism cover (15). Remove
cover.
ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
NOTE
The tilt of the porro prism assembly must
be adjusted to gain access to the screws.
2. Remove three screws (21) and washers
(20) securing porror prism assembly (19).
Remove porro prism assembly.
(b) Replacement.
1.
2.
3.
4.
Position porro prism
assembly (19)
against mounting surface, align mounting
holes.
Install three screws (21) and washers (20)
securing porro prism assembly (19). A ply
tamper detection compound (7526F) to
screw heads.
Align IMU following procedures de-
scribed in paragraph 4-11.
Fit porro prism cover (15) to IMU and
secure with two clamping catches (18).
4-19. Power Supply Maintenance.
a. Power Supply Testing. Testing is performed us-
ing the PSTS as described in paragraph 4-13.
b. Power Supply Repair. Power supply repair con-
sists of removal and replacement of circuit card assem-
blies, chassis-mounted ‘components, gaskets, and hard-
ware. Figure 4-19 and 4-20 are exploded views of the
power supply and power supply subassembly, respec-
tively. Refer to table 4-23 for circuit card identification.
When removing, replacing, or handling
sequence monitor circuit card assembly
A5, power inverter assembly A6, or bat-
tery charger circuit card assembly A7, do
not touch connector pins as damage to
the assembly may result. Check that cir-
cuit card(s) 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.
(1) + 17V converter-regulator circuit card assem-
bly A1. Remove and replace + 17V converter-regulator
circuit card assembly Al (52, figure 4-19, sheet 3) as
follows:
(a) Removal.
1. Loosen 25 captive screws (43) and wash-
ers (44) securing bottom cover (45) and
4-145