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
P1-29 to J3-B
J3-A to K1-A2
P1-18 to J3-D
J3-C to TB1-1
Repair or replace as necessary.
Step 2.
Set power supply 1 at 28(±2) Vdc, power supply 2 at 0 volts,
power supply 3 at 5(± 0.5) Vdc, and power supply 4 at 0 volts.
Use oscilloscope and check for a pulse of at least 3 volts at
P1-32, P1-33, P1-49, and P1-50.
If no pulse is measured,
replace circuit card (paragraph
4-2j).
If correct is pulse measured, check transistors Q1 through
Q5 and diodes D1 and D2 for shorts and opens. Replace as
necessary (paragraph 4-21).
16.
NO GENERATOR ENABLE - ALL INPUTS NORMAL.
Step 1.
Connect GECM to test fixture in accordance with paragraph 4-2a,
except place GEN SOURCE switch in GEN SOURCE position.
Move
ENABLE switch to ON position.
Use voltmeter to check for 5 Vdc
between P1-37 and case ground.
Step 2. Use
If voltage is correct, go to Step 2.
If voltage is incorrect,
check wiring from J2-L to P1-37.
Repair or replace as necessary.
voltmeter and check for 24-28 Vdc at P1-13.
If voltage is measured,
replace circuit card (paragraph
4-2j).
If no voltage is measured,
check wiring from P1-13 to
K1-X1.
Repair or replace as necessary.
If wiring is good,
check diodes D15 and D16 and coil of
relay K1 for shorts and opens.
Replace as necessary
(paragraph 4-2m and 4-2n).
2-52
