HP Business Inkjet 2600 Printer series - Manual (Page 108)

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8 If you cannot locate the jammed media in tray 1 or tray 2, and you
have the auto-duplex unit installed, remove the rear cover from the
auto-duplex unit. To remove the rear cover, push the handles on
the rear cover toward each other, and then pull the rear cover off.
a Grasp any jammed media with both hands and pull it towards
you.
b Reposition the rear cover on the auto-duplex unit.
9 After you clear the jam, close all covers and press R ESUME .
After the jam is cleared, the printer deletes the print job that jammed
and continues with the next print job in the print queue. You will need to
resend the page or pages that were jammed in the printer.