HP 3000dtn - Manual (Page 127)

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3 Look inside the printer. Grasp any jammed media with both hands
and pull it gently towards you.
4 After you have cleared the jam, reinsert the tray into the printer.
Use two hands to support the tray while reinserting it.
5 Press (help button) to clear the message in the LCD control
panel, and then press (select button) to continue printing.
To clear jams inside the simplex unit or optional
auto-duplex unit
1 Remove all media from the output bin.
2 Pull out the output bin and set it aside.
3 Pull out Tray 2 and place it on a flat surface. Remove any wrinkled
or curled media from the tray.
4 Remove the simplex unit or optional auto-duplex unit. To remove
the simplex unit or optional auto-duplex unit, grasp the handle
below the unit and pull it out of the printer. Set the unit aside.
WARNING! The printer contains metal parts that might be hot. Avoid touching
the metal parts inside the printer.