HP LaserJet M4349 Multifunction Printer series - Manual (Page 206)

3. Check for jammed paper in the optional duplexer. Carefully pull out the jammed paper.
4. Set the duplexer aside.
5. Check for jammed paper inside the device. Carefully pull out the jammed paper.
6. Reinstall the duplexer.
7. Reinstall the output bin (or reinstall the 3-bin mailbox or the stapler/stacker).
8. If a jam message persists, jammed media is still in the device. Look for the jam in another location.
192 Chapter 11 Problem solving ENWW