Install guide

ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 3-3. Direct Support Troubleshooting - Continued
Malfunction
Probable cause
Troubleshooting/corrective action
10. Not all CDU lamps light on
a. Burned out bulbs
Replace bulbs. Refer to TM 5-6675-308-
lamp test
12 and/or TM 08837A-12/1
b. Defective CDU
a.
b.
c.
d.
Reverse CDU display register cards
A1 and A2. Refer to para 3-17a
If different lamps remain dark on
lamp test, replace defective card by
substitution
Replace A3 card
Replace CDU. Refer to para 3-13a
11. CDU lights but intensity does
Defective computer
not vary or varies sporadically
12. CDU malfunction flag is white
Defective CDU
13. CDU COMP indicator lights
Defective computer
and/or computer malfunction
flag is white
14. CDU IMU indicator lights
15. CDU CAL indicator lights af-
ter alignment is completed
16. CDU CHRG indicator lights
continuously
a.
b.
a.
b.
c.
Defective IMU or computer a.
b.
IMU out of calibration
a.
Replace computer I/O Discrete card A9.
Refer to para 3-15a
a.
b.
c.
b.
If CDU functions, attempt diagnosis.
Refer to table 3-4
Replace CDU. Refer to para 3-13a
If CDU functions, attempt diagnosis.
Refer to table 3-4
Replace computer. Refer to para
3-13b
If fault not corrected, replace memory
unit A1 (para 3-15b) and IMU. Refer
to para 3-13c
Diagnose. Refer to table 3-4
Replace IMU (para 3-13c) and mem-
ory unit A1. Refer to para 3-15b
Perform IMU 30-day calibration, Re-
fer to table 4-1, TM 5-6675-308-12
and/or TM 08837A-12/1
Replace IMU (para 3-13c) and mem-
ory unit. Refer to para 3-15b
Defective battery
Check batteries. Refer to TM 9-6140-
200-14
Shorted cable W6
Check W6. Refer to para 3-7. Replace as
necessary
Defective PS
With PADS operating and VEHICLE
CB2 circuit breaker set to on, the volt-
age between pins A (+ lead) and F(–
lead) of PS connector 3J2 should be
+ 27 to + 29V. If not, replace PS.
Refer to para 3-13d
Change 1 3-15