HP 970cxi - Deskjet Color Inkjet Printer - Automatic Two-Sided Printing Module

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Using Your Printer
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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
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Turn the knob on the printer’s Rear Access Door counter-clockwise, and remove
the door.