Ricoh FT6645 Manual page 131

DUPLEX 23 April 1993
[E]
[C]
[D]
[F]
[A]
[B]
[H]
[G]
[A]
When the duplex entrance sensor [A] detects the trailing edge of the last
paper, the pressure solenoid [B] turns off to raise the pressure arm [C]. At
this moment, the duplex paper end sensor [D] confirms that no paper remains
on the duplex tray.
The paper end actuator [E] is located on the pressure arm and moves with
the pressure arm.
The paper end sensor is de-activated (the actuator interrupts the
photosensor) only when the pressure arm is in the lower position (solenoid
[B] is on) and no paper is present on the duplex tray.
200ms after the duplex entrance sensor [A] detects the leading edge of the
paper, the duplex feed clutch [F] turns off and the paper is transported by the
duplex transport rollers [G].
When the paper activates the duplex exit sensor [H], the duplex transport
clutch [F] turns off and the paper waits there until the feed timing is adjusted
to match the registration clutch on timing of the previous paper.
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