Canon LBP7660Cdn Manual page 167

5
Make sure that the paper stack does not exceed the load limit mark lines (A).
Be sure that the paper stack does not exceed the load limit mark lines. If the paper stack exceeds the load limit mark
lines, this may result in misfeeds.
6
Set the drawer in the printer.
NOTE
When paper is loaded that is longer than A4 size
When the paper drawer is inserted with it extended, the front side of the paper drawer is not flush with the front surface
of the printer as shown in the following figure.
Next, register the paper size and type.
"Registering the Paper Size and Type"