Canon DADF-M1 Service Manual page 44

Slide guide
(rear)
The track of the slide guide is given a groove so that the slide may stop at specific default
sizes. Some sizes, however, are extremely close to each other, possibly causing the slide to
stop at the wrong point. To make sure that the slide stops at the correct stops, the slide is
provided with a positioning roll [1], which restricts the stops as follows:
ADF controller PCB
Gear
VR1
F-2-20
PI3
Slide guide
(front)
Chapter 2
2-25