Canon IMAGEFORMULA DR-X10C Reference Manual page 50

3.
Push the roller lock lever up (a) and move it to the left
(b) to unlock the roller.
4.
Remove the retard roller.
5.
Use a moistened, well wrung-out cloth to wipe off any
dirt from the roller.
42
■ Reinstalling the Retard Roller
1.
Set the retard roller into place in the scanner.
2.
Align the notches in the roller with the shaft pins in the
scanner, then slide the roller lock lever in the
direction indicated by the arrow.
3.
Pull the roller lock lever down to lock the retard roller
in place.