Kyocera FS-2100DN Operation Manual page 271

Duplex Unit
Paper is jammed in the duplex section. Remove the jammed paper using the procedure given below.
1
Pull the cassette all the way out of the printer.
2
Open the duplex front cover and remove any jammed paper.
3
Close the duplex front cover.
4
Insert the cassette into the slot in the printer. The printer warms up
and resumes printing.
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Troubleshooting