Ricoh Robin Service Manual page 21

DRUM 24 June 1994
1.2 DRUM UNIT
[E]
[A]
[G]
[F]
[C]
[D]
[B]
[C]
[D]
The drum unit [A] consists of an OPC drum [B], ID sensor board [C] and a
pick-off pawl [D]. When the drum, the pick-off pawl, or the ID sensor is
replaced or cleaned, the drum unit must be removed from the copier.
Therefore, the drum has a coupling device which is connected to the drum
drive gear [E]. The ID sensor connector [F] is used for the ID sensor.
The main motor provides rotation directly to the drum through a series of
gears.
The pick-off pawl [D] is always in contact with the drum surface.
2-2