Canon DADF-N1 Service Manual page 43

Chapter 2
F-2-16
[1] ADF controller PCB
[2] Slide guide (rear)
[3] A4R/LTRR sensor (PI5)
[4] Gear
[5] Original width volume
[6] Slide guide (front)
The following shows the relationship between the signals from the individual length sensors
and the sizes identified by the machine in response:
2-20