ARMY TM 9-6115-464-12AIR FORCE TO 35C2-3-445-1NAVY NAVFAC P-8-624-12Table 4-2. Unit Troubleshooting - ContinuedMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION17. AC VOLTAGE FLUCTUATES.Step 1.Step 2.Step 3.Step 4.Loose electrical connection.Inspect electrical system and make any repairs necessary (FO-1 and FO-2).Defective Volt-Amps selector switch.Replace Volt-Amps switch (para 4-63).Defective voltage adjust rheostat.Replace defective voltage adjust rheostat (para 4-63).Defective ac voltmeter.Replace ac voltmeter (para 4-63).18. FREQUENCY FLUCTUATES.Step 1. Erratic engine operation.Refer to malfunction 5 of this table.Step 2. Defective frequency adjust rheostat (class I sets only).Replace frequency adjust rheostat (para 4-63).Step 3. Defective frequency meter.Replace frequency meter (para 4-63).Step 4. Defective frequency transducer.Replace frequency transducer (para 4-63).19. MAIN AC CONTACTOR (CB2) WILL NOT CLOSE.Step 1.Step 2.4-16Defective circuit breaker switch S3.Inspect test S3. Replace if defective (para 4-63).Defective main load contactor (4-40).Disconnect electrical connector (per J41, FO-1, sheet 4) from main load contactor (CB2). Startgenerator set, while holding circuit breaker switch (S3) in closed position. Using a voltmeter, testfor 28 vdc at J41, receptalce A(+) and Receptalce B(-). If 28 vdc is present, inspect and test CB2(para 4-62). Replace if defective. If 28 vdc is not present, notify higher level maintenance.
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