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TABLE 4-1 TROUBLE SHOOTING CHART
Voltage does not build-up to rated value
Probable Cause
Probable Remedy
Voltage adjust rheostat not set correctly.
Adjust rheostat.
Voltage regulator fuse (F1) blown.
Install new fuse.
No field flashing voltage.
Verify flashing assy. output. Refer to wiring diagrams
provided with the generator.
Circuit breaker in incoming power to voltage regulator
open.
Ascertain cause of circuit breaker trip. Correct
abnormal condition and reset circuit breaker.
Improper voltage or loose connections to regulator
power terminals L1 & L2.
Check connections. Check input voltage. Voltage
should be 120 Vac, 400 HZ, nominal.
Generator output heavily loaded or shorted.
Remove short or excessive load.
Regulator rectifier assembly BR1 or BR2 open or
shorted.
Test rectifiers.
Magnetic amplifier MA-1 or MA-2 open.
Check continuity of magnetic amplifier windings.
Replace amplifiers if windings are open.
Loose connections to exciter field (Terminals F+ F-)
Check connections.
Defective exciter or generator.
See generator manual.
Low Voltage
Open Rectifier in assembly BR1 or BR2.
Test. Replace if any of its rectifiers are defective.
Preamplifier (PC board) failure.
Replace PC board.
Voltage adjust not properly adjusted.
Adjust rheostat.
Voltage range adjust R3 requires adjustment.
Adjust for minimum voltage while external voltage
adjust is turned to complete counterclockwise position.
High Voltage
Voltage adjust rheostat not properly adjusted.
Adjust rheostat.
Voltage range adjust R3 requires adjustment.
Adjust for maximum voltage while voltage adjust is
turned to complete clockwise position.
Preamplifier (PC board) defective.
Replace PC board.
Magnetic amplifier MA-1, MA-2 shorted.
Check for shorts.
