Canon PIXMA MX320 Manual page 270

Duplex Printing
Important
Duplex Printing is unavailable when:
A media type other than Plain Paper is selected from the Media Type list.
Poster is selected from the Page Layout list.
When Booklet 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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