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Installing the duplex unit
You can print on both sides of a sheet of paper automatically when the optional automatic two-sided
printing accessory (duplex unit) is installed on the printer. The duplex unit comes with the HP
Officejet Pro K550dtn and HP Officejet Pro K550dtwn printers. For information on using the duplex
unit, see
Printing on both sides (duplexing). See also Accessories for ordering information.
To install a duplex unit
1. Push the buttons on the rear access panel and remove the panel from the printer.
2. Slide the duplex unit into the printer until the unit locks into place. Do not press the buttons on
either side of the duplex unit when installing the unit; use them only for removing the unit from
the printer.
10 Chapter 2 Installing the accessories ENWW