HP LaserJet 9000 Printer series - Manual (Page 90)

Chapter 5 Problem solving 90
Clearing jams
6 Check for paper in the duplex printing accessory area, and
remove any paper by pulling it out of the printer. Be careful not
to tear the paper.
7 Reinstall the duplex printing accessory by sliding it back into the
slot until it locks into place.
8 Close all open doors. If an optional output device is installed,
push it back into place.
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