Generator Svstem - Yamaha EF1000 Service Manual

GENERATOR SYSTEM
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ELEC
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u
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TROUBLESHOOTING
1. AC generation is not normal
Check output voltage at AC Lr
Check AC receptacle with its ter-
receptacle. minals connected with a wire.
0-15V
Conducting
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Faulty voltmeter or faulty load.
Specified reading
Not conducting
Low reading
~
Unusually
40-60V
In-between
~
high reading
reading
l
Faulty AC receptacle
Reset governor arm/ shaft.
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Check engine revolutions.
(i.e. frequency)
Turn adjust bolt anticlockwise,
r More than 3,800 rpm.
observing engine revolutions.
L
Too low
Normal
Stay unchanged
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Return to normal
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Check wiring harness
fo~
continuity: Check AC protector
Faulty adjust plate or faulty
Conducting Not conducting Conducting
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Not conducting
governor.
•
l
Faulty AC protector
1--
Check resistance in main coil.
~~
Faulty wiring harness
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Check resistance in sub-coil.
Infinity or below standard
Standard resistance fl ± 10%
Standard resistance fl ± 10%
120V
11--r
o;=oooc<;oo"' •hort-ok'";' ;,
f . - - -
..---
60Hz
120V main coil. Replace it.
f----- 1---L,__
I - -
~
60Hz
1 - - -
Infinity or below standard.
1.764
+
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Replace the stator assembly
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Check condenser characteristics NOTE:
Check for internal grounding of win-
(Characteristics)
If a digital meter is used, the rise on
dings in main coil and sub coil.
,
__
With tester set to (R x 100), its nee-
readings may be slow, with quick
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Not continuity
die must swing sharply away and
drop-off to "OPEN" reading.
Continuity
back the moment lead wire touches
~
condenser terminal.
r - -
Does not swing Swings
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Faulty coil
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In checking rectifier, connect tester
lead wires to respective rectifier
Condenser punctured or
~
terminals.
deteriorated. Replace it.
Check rotor rectifier.
Rectifier must have one-way
continuity.
Resistance
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Normal direction Continuity
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NOTE:
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Reverse direction
No continuity
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Measure after disengaging from field
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Faulty rectifier.
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coil. Reverse tester leads, there
Not normal Normal
should be no continuity.
Replace it.
Check resistance in rotor (field) coil.
Standard value
Check for internal grounding of rotor
For magnetizing:
4.11fl±10% windings.
Start engine and let both terminals
Infinity or below standard Continuity
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No continuity
of condenser lightly contact cor-
t
responding terminals of lead wires
from 12V battery.
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Disconnection or short-circuit in field
coil. Replace it.
Faulty rotor coil
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Demagnetized rotor
Magnetized rotor
4-7