TM 55-1730-229-12
AC 320A0-OMM-000
TO 35C2-3-473-1
TM 1730-12/1
Table 4-2.
Organizational Troubleshooting (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
(continued)
51.
b. If all continuity checks good, replace GCU (paragraph 4-54).
c. Perform operational check.
AC UNDER VOLTAGE INDICATOR LIT.
52.
While observing AC indicators, set AC POWER switch to RESET, then
Step 1.
return to on.
a.
If UNDER VOLTAGE indicator did not turn off (momentarily), go
to step 2 of malfunction 51.
b.
If UNDER VOLTAGE indicator turns off and remains off,
continue operation if no other abnormal indications are
observed.
If OVER CURRENT indicator lit before UNDER VOLTAGE indica-
c.
tion, see step 2. If not, go to step 3.
Step 2.
Shut down unit and set MASTER SWITCH off. Check load and ac output
power cables for possible shorts.
a. Correct load or replace cables as required.
b. If load and output cables are not shorted, see step 3.
Step 3.
If UNDER VOLTAGE fault recurs, GCU is most probable cause of fault.
The generator is also a possible cause of fault, especially if
COMPT/GEN HI TEMP indicator is illuminated (see malfunction 39).
Replace GCU (paragraph 4-54) or notify maintenance supervisor of
problem. Perform operational check.
AC VOLTS METER READS 0 (AC POWER ON INDICATOR LIT).
53.
Step 1.
Check AC VOLTS meter indication for each setting of AC PHASE SELECT
switch.
a. If AC VOLTS meter reads normal for one or more positions of
AC PHASE SELECT switch, do step 2.
