Canon MX720 Series Online Manual page 132

(1) Make sure that the paper feed roller has stopped rotating, then follow the
message to load plain paper as follows in the paper source you selected in (6)
of step 2.
Loading paper in the cassette (upper):
Cut a single sheet of A4 or Letter-sized plain paper into four pieces.
Load them in the cassette (upper) with the top and bottom edges
cassette (upper).
Loading paper in the cassette (lower):
Load three sheets of A4 or Letter-sized paper in the cassette (lower).
(2) Holding both sides of the paper output tray, gently open it.
The output tray extension will open automatically when the paper output tray is opened.
(3) Extend the paper output support.
(4) Press the OK button.
The machine starts cleaning. The cleaning will be complete when the paper is ejected.
(5) When the completion message appears, press the OK button.
The screen will return to the Maintenance screen.
Note
To access other available functions, use the mode buttons or the MENU button.
If the problem is not resolved after cleaning the paper feed roller, contact the service center.
(A) towards the back side of the