Install guide

ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 4-11. CDU Testing and Troubleshooting – Continued
Malfunction
Test procedure
Normal indication indication/corrective action
lh
1i.
lj.
lk.
2.
2a.
Cable
Unit
——
W203P2
Tape Reader J1
W212P1
SPU 20J 12
W212
TTY
W201P1
SPU 20J 1
W201P2
115VAC
TTY
115VAC
Power
WIP1 CDU 4J1
W1P2
Computer 1J3
Check that W4P 1 is not connected
to IMU connector 2J3
Press SPU ON switch-indicator to
on
Set TTY printer MOTOR switch
to ON
Turn on +28V power source and
set PS BATTERY and VEHICLE
circuit breakers CB1 and CB2 to
ON
CDU TEST
Press CDU ON/OFF switch
PS fan activates
PS fan does not turn on: Check that
system properly connected and
Various CDU indicators may light
power and battery and VEHICLE
circuit breakers CB1 and CB2 are
ON
Check cable W 1 and continuity
between Jl-12and Pl-2and Pi-10,
and J1-23 and P1-16
Repair as required
If wiring is good, replace front panel
assembly
4-73