Canon DR-2050SP - Manual (Page 71)

Appendices 65
Chapter 3
2.
Click the [Reset] button, and then make sure that the [Retard and Feed roller]
has been set to 0.
Removing and Attaching the Feed Roller
Follow the procedure below to remove and attach the feed roller for cleaning
or replacement.
Note
When attaching the feed roller during installation, operate the roller fastening
lever according to the removal procedure and then attach the feed roller.
CAUTION
Do not use excessive force when removing or attaching the feed
roller. Doing so may damage them.