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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 grounding. 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 grounding. 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. 5 mm
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2.Unsolder pigtail and remove old brush and spring.
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