Ricoh Di-C1 Manual page 144

Drum Drive - CMY
This motor drives three drums.
It does not drive the development units.
The drum gear position sensor detects when the motor is not
working.
It also makes sure that the drum gear is at the correct angle when
printing starts.
Slide 144
The function of the gear position sensor is similar to the sensor for black.
The motor drives all three colour drums. This reduces colour alignment
errors.
The two gear position sensors (K, CMY) work together. Both gears must be
at home position at the start of the job. If there is an error, the position of the
black gear is corrected to match the position of the CMY gear.
The mechanism is initialized after every 30 jobs.
Drum Drive
Motor - CMY
Drum Gear Position
Sensor - CMY
144
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