Oki MC853 User Manual page 699

7.
Check for jammed paper inside the machine. If jammed paper
remains, remove it.
8.
Check if paper remains in the duplex unit. If jammed paper
remains, pull it out gently. Check the back side of the duplex unit
and remove jammed paper gently if it remains.
9.
Open the upper duplex unit cover (3) and check for jammed paper.
If jammed paper remains, remove it, and close the cover.
10.
Replace the duplex unit (E) to the machine.
11.
Close the front cover (2).
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