Dell 2330d/dn Mono Laser Printer - Manual (Page 67)

4. Replace Tray 1.
5. Open the rear exit.
6. Remove any jammed paper.
7. Close the rear exit.
8. Turn the printer back on.
9. Send the print job to the printer again.
235 Paper Jam — Check Duplex
There is a paper jam at the output bin because the paper used was too narrow for the duplex unit.
1. Turn the printer off before checking the printer.