Canon FAX-L800 - Manual (Page 280)

Canon FAX-L800 User’s Guide ENGLISH
15-10 Chapter 15 Maintenance & Frequently Asked Questions
If you see any folded, torn, or curled paper, remove it.
Make sure there is no paper remaining inside the fax unit where you removed
the cassette. If you see any paper inside the fax unit, remove it.
Check the side paper cassette selectors and make sure they are set for the
type of paper loaded in the side paper cassette.
Make sure the stack of paper is firmly against the sides of the paper cassette
and below the tabs.
Then set the side paper cassette aside.