Oki COREFIDO B822dn User Manual page 377

5
Remove the paper.
6
Raise the blue lever inside this machine to lock, and close the cover.
7
Insert the paper cassette into the main unit from slightly above and install it back to its original
position.
If you return the paper cassette to the main unit by force, the paper stopper may shift.
8
Close the rear cover.
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Troubleshooting