Dell B2375dfw Mono Multifunction Printer - Manual (Page 321)

3 Push the duplex unit to the printer.
4 Open and close the front cover.
Printing automatically resumes.
CAUTION: If you do not push the duplex unit correctly, paper jam may occur.
Duplex Jam 1
1 Open the rear door.
2 Unfold the duplex guide fully.
3 Pull the jammed paper out.
4 Return the duplex guide and close the rear door.
5 Open and close the front cover.
Printing automatically resumes.
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