Tray Operation - Canon FINISHER-C1 Service Manual

G.

Tray Operation

The finisher has three delivery trays for normal delivery, each accepting sheets.
Each tray is moved up and down by the tray lift motor (M5).
The position of the tray is identified with reference to the number of clock pulses of the tray lift
motor clock sensor 1/2 (PI19/PI9) 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 tray lift motor is equipped with a thermal sensor (TP1). If the sensor reading reaches about
73.5 C when the motor has operated continuously, the finisher controller PCB stops motor loads.
The sensor turns off when its reading drops to about 40 C, causing the finisher driver PCB to return
motor loads.
The finisher controller PCB drives the tray lift motor (M5) to return the tray to home position at
power-on. If the tray is already in home position, it is kept in wait as it is.
The finisher driver PCB moves up and down the tray selected by the copier so that it is posi-
tioned 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 turns 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 driver PCB cuts off the +24V power of the tray lift motor (M5) as soon as the
safety zone detecting switch (MS3) turns on while the shutter and the swing guide are open, thereby
stopping the operation of the finisher.
COPYRIGHT © 1998 CANON INC. FINISHER-C1/SADDLE FINISHER-C2 REV. 0 DEC. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2 FINISHER UNIT BASIC OPERATION
2-35