Canon MG7700 Series Online Manual page 766

Note
• Cleaning the paper feed roller abrades it, so do this only when necessary.
If two or more sheets of paper feed from cassette at once, clean inside of
Check8
cassette.
For information on cleaning the inside of the cassette, see
Are transport unit cover and rear cover attached properly?
Check9
See Rear View for the position of the rear cover.
If the measures above do not solve the problem, contact your nearest Canon service center to request a
repair.
Cleaning the Pad in the
766
Cassette.