Canon STAPLER STACKER SS-72, Service Manual

Page: 50 / 130

E. Tray Movement
The stapler stacker is equipped with three trays, to which paper is delivered. Ascending and
descending of the trays is operated by the tray up/down motor (M5). Each position of the tray
is calculated by detecting the pulse of the encoder mounted on the M5 by tray up/down motor
clock sensor 1 and 2 (PI9). The tray home position sensor (PI8) detects whether the tray is in
the home position or not.
When the power of the stapler stacker is turned ON, the stapler stacker driver rotates the tray
up/down motor (M5) in order to return the tray to the home position. If the tray is in the home
position, it remains in the position and stands by.
The stapler stacker elevates the tray so that the tray specified by the video controller PCB via
the option controller PCB comes to the delivery slot.
The upper limit of the tray is detected by the tray upper limit detection switch (MS5). The
stapler stacker driver stops the tray up/down motor (M5) when MS5 is turned ON.
The height of paper stacked on the tray is detected by the distance sensor (PS1). When the
height of the stacked paper reaches the prescribed value, the tray descends.
The stapler stacker shuts off the +24VDC supply to the M5 and stops its operations when the
safety area detection switch (MS3) is turned ON in the condition that the shutter and swing
guide are open.
The stapler stacker driver informs the option controller PCB of tray up/down motor trouble
in the following cases:
1. Home position detection does not finish in 15 sec. after the detection started.
2. The tray home position detection sensor (PI8) detects the trays 0.5 sec. after the start of tray
elevation.
3. The tray up/down motor clock sensor (PI9) does not detect the encoder clock signal
(SHIFTMCLK) 0.2 sec. after the start of tray elevation.
2 - 24
CHAPTER 2