HP Deskjet 9800 Printer series - Manual (Page 32)

Installing the optional automatic two-sided printing
accessory (duplex unit)
You can print on both sides of a sheet of paper automatically when the duplex unit is installed.
NOTE The duplex unit is a standard part in the HP Deskjet 9800d, 9803d, and 9808d
printers. It may be purchased separately in some countries/regions (see HP supplies and
accessories .)
To install the duplex unit
1 Remove the rear access panel by pushing the release buttons toward each other.
2 Pull the rear access panel out of the printer.
3 Insert the duplex unit straight into the back of the printer until both sides snap into place.
NOTE Do not press the buttons on either side of the duplex unit when installing it. Use these
buttons only for removing the duplex unit from the printer.
22 3 Using print cartridges and accessories