ARMY TM 9-6115-842-24
AIR FORCE TO 35C2-455-12
MARINE CORPS TM 09247A/09248A-24/2
TABLE 2-6. UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
24. AC VOLTMETER (VOLTS AC) VOLTAGE FLUCTUATES.
Step 1. Check for loose electrical connections, refer to Wiring Diagram FO-2.
a. If no loose connections, do Step 2.
b. If loose, tighten electrical connections.
Step 2. Test for defective AC voltmeter (VOLTS AC), paragraph 2-46.2.
a. If AC voltmeter (VOLTS AC) is not defective, do Step 3.
b. If defective, replace AC voltmeter (VOLTS AC), paragraph 2-46.
Step 3. Test for defective VOLTAGE adjust potentiometer, paragraph 2-48.2.
a. If VOLTAGE adjust potentiometer is not defective, do Step 4.
b. If defective, replace VOLTAGE adjust potentiometer, paragraph 2-48.
Step 4. Test for defective AC voltage regulator, paragraph 2-27.2.
a. If AC voltage regulator is not defective, do Step 5.
b. If defective, replace AC voltage regulator, paragraph 2-27.
Step 5. Test for defective AM-VM transfer switch, paragraph 2-52.2.
a. If AM-VM transfer switch is not defective, do Step 6.
b. If defective, replace AM-VM transfer switch, paragraph 2–52.
Step 6. Check AC voltmeter circuit for breaks or loose connections, refer to Wiring Diagram FO-2.
If breaks or loose connections are found, repair circuit.
25. FREQUENCY METER (HERTZ) FREQUENCY FLUCTUATES.
Step 1. Check for erratic engine operation.
a. If engine is running erratically or stalls frequently, refer to malfunction 4.
b. If engine operating properly, do Step 2.
Step 2. Test for defective FREQUENCY meter (HERTZ), paragraphs 2-44.2 or 2-44.3.
a. If FREQUENCY meter (HERTZ) is not defective, do Step 3.
b. If defective, replace FREQUENCY meter (HERTZ), paragraph 2-44.
Step 3. Test for defective frequency transducer, paragraphs 2–28.2 or 2-28.3.
a. If frequency transducer is not defective, do Step 4.
b. If defective, replace frequency transducer, paragraph 2-28.
Step 4. Check for defective frequency adjust control cable, paragraph 2-89.2.
a. If defective, replace or adjust frequency adjust control cable, paragraph 2-89.
b. If frequency adjust control cable is adjusted correctly and not defective and trouble persists, notify
next higher level of maintenance.
2-24
