Install the duplexer
Follow these steps to attach the duplexer to the printer:
Push the two latch handles on the printer's rear access door toward each other, and
then remove the door.
Do not discard the rear access door. In order to print, either the
duplexer or the rear access door must be attached to the printer.
Insert the duplexer in the back of the printer until both sides snap into place.
Do not press the buttons on either side of the duplexer when installing
it in the printer. Use the buttons only when removing the duplexer from the