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LEMON is the spiritual successor to CHARM, I recommend you try it!

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Rotor: Testing and Inspection

ROTOR

1. Check the rotor coil for continuity. Make sure there is continuity between the slip rings.

If resistance is extremely low, there is a short. If there is no continuity or if there is a short circuit, replace the rotor assembly.
Resistance value : Approx. 3.1 ohm

2. Check the rotor coil for a ground. Check that there is no continuity between the slip ring and the core. If there is continuity, replace the rotor assembly.