Oki B412dn User Manual - page 224
If you cannot remove the paper, open the rear cover, hold the top end of the paper, and then pull the paper out gently.
If you cannot remove the paper by using the above method, proceed to step 4 without pulling it out forcibly.
4.
Align the guide posts (ABCD) on the left and right sides of the image drum with their guide grooves on
the left and right sides inside the printer, and then put the image drum back into the printer gently.
If you cannot pull the paper out, turn the printer off, and then back on. When the printer starts, hold the top end of the paper,
and then pull the paper out.
Note
If a paper jam occurs when feeding paper, check if paper still remains in each paper path. Note that you must open and close
the top cover to cancel the ALARM display.
5.
Close the top cover.
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