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