Rotor: Testing and Inspection
INSPECTIONROTOR
1. Slip ring surface
Inspect slip rings (A) for contamination or any roughness of the sliding surface.
Clean or polish with #500 to #600 emery paper if defective.
2. Slip ring outside diameter
Measure slip ring outside diameter. If slip ring is worn, replace rotor.
3. Continuity test
Check continuity between slip rings (A). If the measured resistance is 1 MOhm or more, replace rotor.
4. Insulation test
Check continuity between slip ring (A) and rotor core (B) or shaft. If the measured resistance is 1 MOhm or less, replace rotor.
5. Ball bearing
Check rear ball bearing. Replace it if it is noisy or if rotor does not turn smoothly.