HP 990cxi - Deskjet Color Inkjet Printer - Automatic Two-Sided Printing; Installing the Module

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Printing Basics: Automatic Two-Sided Printing
Automatic Two-Sided Printing
The Automatic Two-Sided Printing
Module is a special hardware and
software feature that enables your printer
to automatically print on both sides of
the page.
Installing the Automatic Two-Sided Printing Module
1 Turn the knob on the printer’s Rear Access Door counter-
clockwise, and remove the door.
2 Insert the module into the back of the printer.