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Repair or replace as necessary | Up
TM-5-6115-612-34 Gas Turbine Engine Driven Aviation Generator Set Manual | Next
Section III. GENERAL MAINTENANCE |
paragraph 4-2a
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
17.
NO OR POOR REGULATION - ALL INPUTS NORMAL.
Step 1.
Check for low power limit setting in generator set. Increase
load until there is a noticeable drop in voltage. Multiply
output current by voltage to obtain power limit.
If power limit is above 10 kW, go to Step 2.
If power limit is below 10 kW, go to Malfunction 8.
Step 2.
Use oscilloscope and check for a pulse of at least 5 Vdc at
P1-41.
If pulse is correct, go to step 3.
If no pulse, replace circuit card (paragraph 4-2j).
Step 3.
Check transistor Q5, diodes D5 and D9, and resistors R1 and R2
for shorts and opens.
Replace as necessary (paragraph 4-21,
4-2n, 4-2o).
18.
NO OR INCORRECT POWER LIMIT.
Step 1.
Connect GECM to test fixture in accordance with paragraph
Set power supply 2 to 28 Vdc and power supply 4 to 22.7
millivolts dc.
Use voltmeter and check for power supply 2
voltage (28 Vdc) at P1-38(+) and P1-39(-).
If voltage is correct, replace card (paragraph 4-2j).
If voltage is incorrect,
check wiring from J2-E to P1-38
and from J2-F to P1-39.
Repair or replace as necessary.
If wiring is good, go to Step 2.
Step 2.
Use voltmeter and check for power supply 4 voltage at P1-25(+)
and P1-26(-).
If voltage is correct, replace card (paragraph 4-2j).
If voltage is incorrect,
check wiring from J2-K to P1-25
and from P2-J to P1-26.
Repair or replace as necessary.
2-53/(2-54 blank)
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