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Symptoms
D-4 Voltage is abnormally low
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Parts
Brush
AVR
Engine
Lead line
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;I Fi c
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Fl Breakage of lhe lead line
AVR failure
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Checking
method
Checking
criteria
1. Confirm condition of
the slip ring’s contact
surface
2. Measure length of the
brush
1. If contact surface of the
slip ring is contaminated,
clean it.
2. If the brush length is
shorter than the standard,
replace it.
Measure resistance between
the terminals with a circuit
tester
(Measure with a 4P coupler)
If the measure resistance
is different from the
standard, replace the AVR.
Measure rpm at the rated load
50Hz:
3000 * 30rpm
60Hz:
3600 + 30rpm
Measure continuity with
a circiut tester
In case of 00
Sl,
the lead line
is defective.