ARMY
TM 5-6115-612-34
MARINE CORPS TM 6115-34/8
AIR FORCE
TO 35C2-3-471-2
NAVY
AG-320BO-MME-OOO
2-3. GENERAL. (cont)
Table 2-4. Troubleshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CAUTION
To prevent damage,
do not leave GECM in
OVER VOLTS condition for more than 30
seconds.
If OVER VOLTS light comes on, shut down power and go to
Malfunction 17.
If OVER VOLTS light stays off, go to Step 2.
Step 2.
Increase power supply 2 output voltage to 38(±1) Vdc.
If OVER VOLTS light comes on, go to Malfunction 17.
If OVER VOLTS light stays off, go to Step 3.
Step 3.
Use voltmeter to check voltage from circuit card connector
P1-39(+) and P1-38(-).
If voltage reads same as power supply 2 output voltage, go
to Step 4.
If voltage is less than 37 Vdc, check wiring from J2-E to
P1-38 and from J2-F to P1-39.
Repair or replace as
necessary.
Step 4.
Set power supply 2 output voltage to greater than 37 Vdc. Use
voltmeter to check voltage at P1-48 and P1-18.
If voltage is same as output voltage of power supply 1 (28
Vdc), go to Step 5.
If voltage is not correct, check wiring from J2-G to P1-48
and from J2-M to P1-18.
Repair or replace as necessary.
Step 5.
Use voltmeter to check voltage at circuit card connector
P1-35(+) and P1-18(-).
If voltage is 5(±1) Vdc,
replace circuit card (paragraph
4-2j).
2-49
