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Table 2-4. Troub leshooting - continued | Up
TM-5-6115-612-34 Gas Turbine Engine Driven Aviation Generator Set Manual | Next
Table 2-4. Troub leshooting - continued |
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. Troub leshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9.
CONTACTOR CLOSED INDICATOR LIGHT WILL NOT COME ON - PROBLEM ISOLATED TO EECM.
Step 1.
Check wires from J6-T to switch circuit card P2-21 and from
J6-S to switch board P2-19.
Repair or replace as necessary.
Step 2.
Connect EECM under test to EECM tester. Place MASTER SWITCH in
START position and release to RUN position. Inject a signal
into SPEED input.
Increase frequency to 3352 Hz ± 67 Hz.
Connect voltmeter to P1-1(+) and to E1(-) ground terminal.
Read voltage.
If voltage is less than 1.5 Vdc, replace switch circuit
card (paragraph 10-2b).
If voltage is more than 1.5 Vdc, replace microprocessor
circuit card (paragraph 10-2b).
10. NO OUTPUT VOLTAGE - PROBLEM ISOLATED TO EECM.
Step 1.
Perform steps under Malfunction 6.
11.
UNDERVOLTAGE MALFUNCTION LIGHT COME ON - OUTPUT VOLTAGE NORMAL.
Step 1.
Connect GECM to test fixture in accordance with paragraph 4-2a.
If UNDER VOLTS light comes on, go to Step 2.
If UNDER VOLTS light off, go to Step 5.
Step 2.
Increase power supply 2 output voltage to 20 (± 1) Vdc.
If UNDER VOLTS light goes off, go to Malfunction 17.
If UNDER VOLTS light stays on, go to Step 3.
Step 3.
Use voltmeter to check voltage at circuit card connector P1-39
(+) and P1-38(-).
If voltage reads same as power supply 2 output voltage, go
to Step 4.
2-47
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