Epson B 310N - Manual (Page 150)

Troubleshooting 150
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After you remove the jammed paper and insert the front paper cassette, reinsert the output
tray into the printer.
In the back of the printer:
Remove the duplex unit (B-510DN) or the upper rear printer cover (B-310N) and open
the lower rear printer cover. Then gently pull out the jammed paper.