Canon MX720 Series Online Manual page 137

8. If the paper is not loaded properly in the cassette, remove the paper, then reload it after aligning the
edges of the sheets.
Note
When reloading the paper, confirm that you are using the paper suited for printing and are
loading it correctly.
9. Attach the cassettes to the machine, then press the OK button.
If you cannot remove the paper or the paper tears inside the machine, or if the paper jam error continues
after removing the paper, contact the service center.