Drum Drive Mechanism - Ricoh C217 Service Manual

5.2 DRUM DRIVE MECHANISM

The drum is driven by the main motor (DC motor) through a timing belt [A]
and gears [B]. The main motor has an encoder which sends pulses to the
main PCB. The main PCB monitors the pulses and controls the drum speed
and stop positions.
The drum has two stop positions as follows:
1) Master eject position/ Home position
2) Master feed position
These stop positions are determined by checking the feed start timing
sensor [C]. The main PCB starts counting the main motor encoder pulses
when the feed start timing sensor is actuated. The following pulse count
numbers are assigned for drum stop timing.
1) 440 pulses for the master eject position
2) 64 pulses for the master feed position
When the drum is stopped at the master eject position, the master eject
position sensor [D] is actuated. When the master eject operation is started,
the main PCB confirms if the drum is at the master eject position by this
sensor [D].
C217
[C]
[D]
[A]
2-22
[B]
SM