Ricoh C211 Service Manual page 485

2. Drum Rotating Mechanism
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The main motor (dc motor) [A], located under the rear side plate, turns the drum either
clockwise or counterclockwise. It drives the drum through gears [B], [C], [D], pulley [E],
belt [F], and pulley [G].
To decrease the driving noise, this mechanism uses of helical gears. On this machine, it
is possible to change the drum for color printing, so gears [H] and [J] have grooves as
shown below to prevent the drum from shifting against the driving section of the
machine. The pulse disk [M] and the sensor [1] are located on
check the drum rotation speed.
When the interruptor [L] is positioned in the first drum position
to replace the drum unit.
the main motor shaft to
sensor [K], it is possible
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