PRELIMINARY PROCEDURE: Remove windspeed generator G1 (para 5-10).
Using digital multimeter, check for 200-ohm resistance (+ 1 ohm) between collector ring
brushes (1) and (2).
For T-420/GMQ-11 and T-420A/GMQ-11, the resistance measured is the sum of the resistance of the armature,
resistance spool R204, and neutralizer R205.
For T-420B/GMQ-11, the resistance measured is the sum of the resistance of the armature and resistor R1.
If readings are insufficient or excessive, refer to higher level of maintenance.
Slowly turn armature one-half revolution at a time to test each portion of armature.