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2
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Symptoms
D-l
No DC voltage is output
( 1
D-2 Voltag,eistoo high
q
Parts
Possible
q
causes
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Stator DC coil
1. Disconnection
2. Short circuit
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Diode stack
The diode is defective
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Lead line
Disconnection of the
lead line
AVR
AVR failure
Checking
method
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Remedies
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Measure the resistance
value between the
terminals with a
circuit tester
(Measure at the
section where diodes
are connected)
In case of OQ
bl
. . .
Disconnection
In case of
Oil . . .
Short circuit
r
Replace the stator
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Confirm continuity
between the terminals
with a circuit tester
Refer to 8-2) “Diode
stack”
Replace the diode
stack
Measure continuity
with a circuit tester
In case of 00
51,
the
lead line is defective.
Replace the lead line
Measure resistance
value between the
terminals with a
circuit tester
(Measure with a 4P
coupler)
If the resistance is
different from the
standard, replace
the AVR
rpm of the engine
increases too much
(Frequency is too
Measure rpm at the
rated load
50Hz: 3000+30rpm
60Hz: 3600”30rpm
Regulate rpm
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