Canon ScanFront 400 Instructions Manual page 176

4.
Remove any dirt from the rollers using a cloth that
has been soaked in water and thoroughly wrung out.
IMPORTANT
Wipe the rollers clean while rotating them.
5.
Remove the retard roller and feed roller, and remove
any dirt from them.
See "Cleaning the Retard Roller" on p. 177.
See "Cleaning the Feed Roller" on p. 179.
After you remove the retard roller and feed roller and finish
cleaning them, make sure to reattach them to the scanner.
6.
Gently close the panel unit. Press on both sides of
the unit until you hear a click, which indicates the unit
is locked.
Clean the rollers
while rotating
them
7.
Gently close the document eject tray.
Retard Roller
Feed Roller
176
IMPORTANT
Chapter 8 Maintenance