Ricoh B234 Service Manual page 876

PAPER FEED
[F]
[A] [E]
[B]
B234D957.WMF
[D]
[C]
[G]
[H]
B234D958.WMF
When a stack of paper is loaded in the tray, the paper end sensor below the stack
(not shown) activates and switches on the pick-up solenoid [A] to lower the pick-up
roller [B]. At the same time, the tray lift motor [C] switches on and lifts the bottom
plate [D]. This plate pushes the top of the stack up against the pick-up roller until
the actuator [E] descends and leaves the tray lift sensor [F] slot. This de-activates
the tray lift sensor; the tray is now at the correct feed position so the machine
switches off the tray lift motor.
The pick-up roller descends gradually with each sheet fed, so the tray lift sensor
actuator ascends until it activates the tray lift sensor. This signals the machine to
switch on the tray lift motor to raise the stack to the correct feed height. The tray lift
sensor again deactivates to switch off the tray lift motor. This process is repeated
to position the top of the stack at the correct feed height.
When the tray is drawn out of the feed unit, the lift motor coupling gear [G]
disengages the pin [H] of the lift arm shaft, then the tray bottom plate drops under
its own weight.
B234/B235/B236/D101/D102/D103 6-114 SM