Epson AcuLaser C8600 Reference Manual page 299

Caution:
c
Be sure to pull out the Duplex Unit's main unit after checking if
the jammed paper is in the paper cassette cover (cover D) or the
Duplex Unit's inverter cover (cover F). If you pull out the main
unit first, the paper jam may occur.
1. Pull the main unit of the optional Duplex Unit out until it
stops.
2. Gently remove the jammed paper with both hands. Be careful
not to tear the jammed paper.
Troubleshooting
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