ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Probable cause
Troubleshooting/corrective action
Malfunction
NOTE
Fault indicators are normally black. Before applying power, inspect CDU, computer, and
PS for set (white) fault indicators and record for troubleshooting. Change fault indicators
from white to black by pressing LAMP after power has been applied.
If a malfunction occurs, recycle power and restart the test to verify. If more than one
fault indicator is set, the most likely defective unit (in priority order) is PS, computer,
CDU, and IMU. Cables are also suspect.
Because a computer memory module contains calibration data for a specific IMU, the
memory module and IMU must be replaced as a matched set. To check the serial number
of the IMU a particular memory is programmed for, press MON, ID,1,8, ENT. The dis-
day should read 18 M, XXX, where XXX represents the IMU serial number. The Julian
date of the calibration data is in MON ID location 17.
a.
Defective circuit breaker
Replace PS. Refer to para 3-13d
1. BATTERY circuit breaker CB1
and/or VEHICLE circuit
Short in PS
b.
Replace PS. Refer to para 3-13d
breaker CB2 do not stay ON
Power source not on or
a.
2. When the ON/OFF button is
Check electrical connections as shown in
improper test set up
pressed to turn system on, the
system shuts down when the
Defective PS
button is released or PADS does b.
Replace PS. Refer to para 3-13d
not turn on when ON/OFF
button is pressed, but BATTERY c.
Defective cable W 1 or W3
Check cables. Refer to para 3-7. Replace as
necessary
and VEHICLE circuit breakers
CB1 and CB2 stay ON and no
d.
Defective CDU
Replace CDU. Refer to para 3-13a
malfunction flags are set
e.
Defective computer
Replace computer. Refer to para 3-13b
PADS overheated
a.
3. PADS stays on momentarily
a. Let system cool down
after release of ON/OFF
button or shuts down with no
b. Check fan operation. Refer to steps 4,
fault indicator set
5, and 6
c. Clean cooling system. Refer to
TM 5-6675-308-12 and/or
TM 08837A-12/l
b. Defective IMU overtemp
a. Turn PADS off and disconnect W5P2
thermostat
from PS connector 3J1
b. Measure resistance between pins G and H
of W5P2
If resistance is less than 100 kilohm,
c.
replace IMU. Refer to para 3-13c
d. Reconnect W5
Defective PS
Replace PS. Refer to para 3-13d
c.
Change 6
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