For The Error Code 631 - Oki COREFIDO B822dn User Manual

4
Press the front cover open button on the side of this machine, open the front cover toward you,
and then close it firmly with your both hands.
The error cannot be cleared without opening and closing the front cover.

For the error code 631

1
Pull out the paper cassette of Tray 1 by holding its handle until it stops, raise the paper cassette
a little by holding its both sides, and take it out.
2
Remove the jammed paper.
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Troubleshooting