Canon Finisher-T1 Service Manual page 30

the stack.
The feed motor (M101), stack ejection motor (M102), rear end assist motor (M109), escape feed motor (M112), and
inlet motor (M113) are step motors. These motors are rotated forward or backward by the microcomputer (CPU) in
the finisher controller PCB.
The following three sensors are provided in the copy delivery path to detect the arrival or passing of copies.
- Inlet sensor (PI103)
- Delivery path sensor (PI104)
- Escape tray path sensor (PI118)
Also, each ejection tray has sensors to detect the presence of copy on the tray.
First tray paper sensor (PI111)
Second tray paper sensor (PI112)
If the copy does not reaches or passes each sensor within prescribed time, the finisher controller PCB determines that
the jam has occurred and stops the operation. Then it notifies the host machine that a jam has occurred. When all of
the doors are closed after fixing the jam, the finisher checks whether copy is detected by any of the above three
sensors (inlet sensor, delivery path sensor, escape tray path sensor). If any of the sensors detects a copy, the finisher
determines that the jam is not fixed and sends jam processing signal to the host machine once more.