Boards; Drum - Ricoh C231 Service Manual

6.6.2 DRUM DRIVE MECHANISM
Mechanism
Main motor [A] (dc motor)
Belt [B]
Gears [C]
The drum rotates.
NOTE: 1) The main motor encoder sends pulses to the main motor control board
(1020 pulses = 360 degrees).
2) The CPU on the board monitors the pulses and controls the drum speed
and stop positions.
3) The drum has four sensors.
Master eject position sensor [D] (master eject position and HP)
Feed start sensor [E] (feed start timing)
Second feed timing sensor [F] (jam detection)
Paper exit timing sensor [G] (jam detection)
4) The drum has two stop positions:
Master eject (home) position
Master feed position (feed start timing sensor + 121 pulses (43
degrees))
SM
[D]
[E]
[A]
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DRUM

[G]
[F]
[C]
[B]
C238D019.WMF
C231/C237/C238