HP 3000dtn - Manual (Page 35)

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Auto-duplex unit
The printer can automatically print on both sides of paper with the
auto-duplex unit. If your printer does not have an auto-duplex unit,
one can be purchased separately. For information about using the
auto-duplex unit, see “
Printing on both sides of the page .”
Installing the auto-duplex unit
Two-sided printing (duplexing) might require additional memory. For
more information, see “
Additional printer memory and font DIMMs .”
1 Press and hold (power button) to turn off the printer.
2 Grasp the output bin by both sides and pull it straight out of the
printer. Do not lift or tilt the output bin while removing it. Set the
output bin aside.
3 Grasp the handle under the front of Tray 2. Pull out Tray 2 until it
catches. Slightly lift up Tray 2, or move the tray counterclockwise,
and pull it completely out of the printer. Set Tray 2 aside.
4 Grasp the handle under the front of the simplex unit. Avoid touching
the star wheels. Pull the simplex unit straight out of the printer, and
set it aside. Keep the simplex unit for future use.
5 Look for the two guides inside the printer. Insert the rails of the
auto-duplex unit into these guides. Slide the auto-duplex unit into
the printer until it locks into place.