Tray Operation - Sharp AR-FN8 Service Manual

CHAPTER 2 FINISHER UNIT BASIC OPERATION
G.

Tray Operation

The finisher has two delivery trays for normal delivery, each accepting sheets.
Each tray is moved up and down by the tray lift motor (M5).
The position of tray is identified with reference to the number of clock pulses of the tray lift
motor clock sensor 1/2 (PI9/PI19) coming from the tray home position sensor (PI8). The finisher
controller PCB finds out in which direction (up or down) the tray is moving based on combinations
of pulses from the two clock sensors.
The finisher controller PCB drives the tray lift motor (M5) to return the tray to the home
position at power-on. If the tray is already at the home position, it is kept waiting as it is.
The finisher controller PCB moves up and down the tray selected by the host machine so that it
is positioned at the delivery slot.
The upper limit of the tray is detected by the tray upper limit detecting switch (MS5). The
finisher controller PCB stops the drive (up) of the tray lift motor (M5) as soon as the tray upper
limit detecting switch is turned on.
The height of the stack on the tray is identified by the height sensor (PS1), which measures its
distance from the top of the stack. The tray is moved down when the distance between the top of the
stack and the delivery assembly drops to a specific measurement.
The finisher controller PCB cuts off the +24V power of the tray lift motor (M5) as soon as the
safety zone switch (MS3) is turned on while the shutter and the swing guide are open, stopping the
operation of the finisher.
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