Install the automatic two-sided printing accessory (duplexer)
You can print on both sides of a sheet of paper automatically. For information on using
the duplexer, see Print on both sides (duplexing).
To install the duplexer
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Slide the duplexer into the back of the printer until the unit locks into place. Do not
press the buttons on either side of the duplexer when installing the unit; use them
only for removing the unit from the printer.