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/correc tive action
b. Defective cable W5
c.
Defective PS
7. PADS shuts down with PS
Defective PS
FAIL fault indicator DS2
white
8. PADS shuts down with com-
a. Computer overtemperature
puter fault indicator white shut down
b. Defective computer
thermostat
c. Defective computer power
supply
d. Defective computer
9. PADS on but all CDU lights
a. Intensity set dim
are dark (fan(s) operate)
b. Defective cable W 1
c.
Defective computer supply
d. Defective CDU
e. Defective computer
c. If both voltages are between 105 and
125 VAC, replace fan. Refer to
TM 5-6675-308-12 and/or
TM 08837A-12/l
See step 5b above
See step 5C above
Replace PS. Refer to para 3-13d
Allow system to cool down. If system oper-
ates for a short period, check operation of
computer fan. Refer to steps 5 and 6.
Repair as necessary
Measure resistance across computer thermo-
static switch S 1 (Refer to para 3-15c to
separate computer power from computer sub-
assembly to gain access to switch S 1 (30,
figure 3-7). If less than 300 ohms, disconnect
one lead from switch S 1. If resistance is
still less than 300 ohms, replace computer
Replace computer power supply. Refer to
para 3-15c
Replace the circuit cards below, listed in order
of probable malfunction. Refer to para
3-15a
(1) 1/0 Discrete card A9
(2) Data buffer card A6
(3) Computer
(4) Memory module Al and IMU
Perform lamp test. Refer to para 3-4
Check WI. Refer to para 3-7. Replace as
necessary
If fault indicators do not set white and then
reset black during lamp test, replace compu-
ter power supply. Refer to para 3-15c
Replace CDU. Refer to para 3-13a
Replace computer. Refer to para 3-13b
3-14