Canon MP480 series On-Screen Manual page 232

Duplex Printing
Duplex Printing is unavailable when:
A media type other than Plain Paper is selected from the Media Type list.
Poster Printing is selected from the Page Layout list.
When Booklet Printing is selected from the Page Layout list, Duplex Printing and Staple Side
appear grayed out and are unavailable.
Note
If the Media Type dialog box appears when performing borderless printing during duplex printing,
select Plain Paper.
If the back side of the paper becomes smudged during duplex printing, perform Bottom Plate
Cleaning in the Maintenance tab.
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