Oki B412dn User Manual page 440

7.
Gently take out the image drum in the upward direction.
Note
With the starter cartridge, the ISO/IEC19752 standard print pattern can be printed on approximately 2,000 sheets of A4 paper.
8.
Remove the desiccant pack before installation.
9.
Align the image drum pins (A to D) with the grooves (A to D) inside the main unit, and then reinstall
the image drum into the printer.
10.
Turn the knob on the right side in the direction of
while holding the top surface of the toner cartridge with your hand so that the cartridge does not rise.
11.
Close the top cover.
on the toner cartridge until the knob stops rotating
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