Canon iP7200 Series Manual page 80

Note
Loading paper larger than A4 size
To load paper larger than A4 size in the cassette (lower), press down the lock (F) on the
cassette (lower), then extend the cassette (lower).
The cassette (lower) sticks out of the printer when correctly set. Do not force the cassette
(lower) into the printer any further.
This can damage the printer or cassette (lower).
(6) Insert the cassette (lower) into the printer.
Push the cassette (lower) into the printer until it stops.