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1.Check the rotor coil
continuity. Make sure that there is continuity between the
slip rings. Measure the rotor resistance. If it is
excessively small, it indicates a shorted rotor. If there is
no continuity or if it is shorted, replace the rotor
assembly.
Standard value: 3 - 5
Ω
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2.Check for rotor coil
earthing. Make sure that there is no continuity between the
slip ring and the core. Replace the rotor assembly if there
is continuity.
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1.Check the stator
continuity. Make sure that there is continuity between the
coil leads. Replace the stator assembly if there is no
continuity.
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2.Check for coil earthing.
Make sure that there is no continuity between the coil and
the core. Replace the stator assembly if there is
continuity.
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1.Positive Rectifier Test:
Check for continuity between positive rectifier and stator
coil lead connection terminal with a circuit tester.
If
there is continuity in both directions, diode is shorted.
Replace rectifier assembly.
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2.Negative Rectifier Test:
Check for continuity between negative rectifier and stator
coil lead connection terminal.
If there is continuity in
both directions, diode is shorted, and rectifier assembly
must be replaced.
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3.Diode Trio Test: Check
three diodes for continuity by connecting an ammeter to both
ends of each diode.
If there is no continuity in both
directions, diode is faulty and heatsink assembly must be
replaced.
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1.Replace the brush if its
protrusion length is less than the
limit.
Limit: min. 2 mm
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2.Unsolder pigtail and
remove old brush and spring.
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