Canon Finisher-R1, Service Manual

Page: 46 / 177

Chapter 2
2-22
2.6 Detecting Jams
2.6.1 Detecting Jams (Finisher Unit)
0003-4562
The following sensors are used to detect the presence of paper and to determine that paper is delivered properly.
• Inlet sensor (PI33)
• Delivery sensor (PI34)
A jam is identified by checking whether paper is present at each sensor at the timing programmed in the memory of
the microcomputer (CPU) on the finisher controller PCB.
When the CPU identifies a jam, it suspends the finisher’s delivery operation and informs the host machine DC
controller of the presence of a jam. When all doors are closed after the paper jam is removed, the finisher checks
whether paper is detected by the above two sensors (inlet sensor and tray 1 delivery sensor). If the sensors detect
paper, the finisher determines that paper jam is not completely removed and sends a jam removal signal to the host
machine once more.
F-2-28
T-2-7
Jam Type Sensor Jam Condition Code
Inlet sensor
delay PI33 When the inlet sensor (PI33) does not detect
paper after a prescribed time (distance) has
elapsed since receiving a delivery signal from
the host machine. 1001
Inlet sensor
stationary PI33 When paper does not exit the inlet sensor (PI33)
after delivering for a prescribed time (distance)
after the inlet sensor (PI33) detected paper. 1101
PI34
PI33