ARMY TM 9-6115-641-24
AIR FORCE TO 35C2-3-456-12
Table 2-6. UNIT TROUBLESHOOTING - Continued.
TEST OR INSPECTION
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 AMVM transfer switch, paragraph 2-52-2.
a. If AM-VM transfer switch is not defective, do Step 6.
b. If defective, replace AMVM transfer switch, paragraph 2-52.
Step 6. Check AC voltmeter circuit for breaks or loose connections, refer to Wiring Diagram FO-2.
a. If breaks or loose connections are found, repair circuit.
b. If engine is running erratically or stalls frequently, refer to MALFUNCTION 4.
25. FREQUENCY METER (HERTZ) FREQUENCY FLUCTUATES.
Step 1. Check for erratic engine operation.
a. If engine is operating properly, do Step 2.
b. If Engine Runs Erratically or Stalls Frequently. Refer to Malfunction 4.
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.