Ricoh C211 Service Manual page 173

9.2 DRUM ROTATION SENSOR ADJUSTMENT
Purpose: To ensure correct main motor speed detection.
1,
2,
3.
4*
Remove the rear cover of the machine.
Make sure that the drum rotation sensor [A] is positioned so that the pulse
disk [B] is inserted into the sensor by 8 + 1 mm as shown above,
If not, loosen the screw [C] securing the sensor bracket and adjust the
sensor bracket position.
After adjustment, set a spanner (1O mm) into the drum shaft and rotate the
drum to make sure that the pulse disk does not contact the sensor during a
rotation.
5-61