Drum Drive Mechanism; Drum Pawls - Ricoh A-P4 Service Manual

Photoconductor Unit (PCDU)

Drum Drive Mechanism

The drive from the main motor [A] is transmitted to the drum [B] through a series of gears, a timing belt [C],
and the drum drive shaft [D].
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The main motor has a drive controller, which outputs a motor lock signal when the rotation speed is out of
the specified range. The flywheel [E] on the end of the drum drive shaft stabilizes the rotation speed (this
prevents banding and jitter on copies).

Drum Pawls

The pick-off pawls [A], mounted in the holders [B] on the drum and in contact with the drum, strip paper
from the drum if it has not yet separated. The gears [C] are removable, and the positions of the holders can
be adjusted.
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