Canon Finisher-R1, Service Manual

Page: 42 / 177

Chapter 2
2-18
2.5 Stack Tray Operation
2.5.1 Tray Operation
0003-4561
This equipment has two delivery trays. The upper tray is called tray 1 and the lower tray is called tray 2. The upper
and lower tray can move up and down independently.
The trays are moved up and down by the tray 1 shift motor (M37) and tray 2 shift motor(M38).
Tray 1 paper sensor (PI42) and tray 2 paper sensor (PI43) are provided to detect the presence of the paper stacked on
the tray.
The home position of tray 1 is detected by the paper surface sensor (PI41) and the home position of tray 2 is detected
by the tray 2 paper surface sensor (PI48). The home position is the top surface of the paper if papers are already
stacked on the tray, or the position where the edge of the tray is detected if no paper is stacked. When the power is
turned on, the finisher controller PCB drives the tray 1 shift motor (M37) and tray 2 shift motor (M38) to return the
tray to home position. If the tray is already at home position, it is moved out of the home position once and then
returned to the home position once more. If both tray 1 and tray 2 are at home position, this is performed for tray 1
and then for tray 2. If the tray specified by the host machine is tray 2, the finisher controller PCB shifts the tray so
that tray 2 is at delivery port.
When paper is stacked on the tray, a prescribed number of pulses drive tray 1 shift motor (M37) or tray 2 shift motor
(M38) and the tray is lowered. Then the tray returns to home position to prepare for the next stack.
The upper and lower limits of the tray are detected by three area sensors (PS981, PS982, and PS983) on tray 1 and
tray 2 shift area sensor PCB. The finisher controller PCB stops driving the tray 1 shift motor (M37) and tray 2 shift
motor (M38) when it detects the upper or lower limit of the tray. Also, the ON/OFF combinations of the area sensors
(PS981, PS982, PS983) are used to detect over-stacking according to the stack height for large size and mixed
stacking. The following figure shows the items detected with the ON/OFF combinations of the area sensors (PS981,
PS982, PS983).
The finisher controller PCB stops sup24V to the tray 1 shift motor (M37) and stops the finisher operation
when tray 1 switch (MS33) turns ON.