Oki B412dn User Manual page 182

Note
If the metal plate (1) under the paper in the paper cassette is up, press it down until it locks with a click before inserting the
paper cassette into the printer. Inserting the paper cassette without pressing down the metal plate may cause malfunction.
Memo
To use A4, Legal (13 inches), Legal (13.5 inches), or Legal (14 inches) size paper with Tray 1, pull out the paper stopper
toward the rear of the paper cassette. To shorten the length of the paper stopper, press the paper stopper toward the front
side of the paper cassette.
To use A4, Legal (13 inches), or Legal (14 inches) size paper with Tray 2, move the lock lever (1) in the direction of the
arrow to unlock, and then pull out the rear part of the paper cassette toward the back side. Unlock the lock also when
shortening the paper cassette, which is done by pushing in the rear part of the paper cassette toward the front side.
In the case of a 530-sheet cassette, unlock the paper stopper before pulling it out.
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