Epson EPL-N2000 Reference Manual page 142

Feed Jam when using the optional lower paper cassette
See "Feed Jam when using the lower paper cassette", on page
6-3.
Feed Jam when using the Duplex unit
1. Press the top of the Duplex unit and open the cover.
2. Remove any folded paper from the unit, and discard any
curled or wrinkled sheets. Then close the cover. If you
cannot remove the paper, follow the step 3 and 4.
6-16
Troubleshooting and Maintenance