Oki MB472dn User Manual page 785

Note
Do not expose the image drum to light for 5 minutes or more.
Do not touch the shiny green surface at the bottom of the image drum.
15.
Remove the desiccant pack from the image drum.
16.
Align the image drum pins (A to D) with the grooves (A to D) inside the machine, and then reinstall
the image drum into the machine.
17.
Rotate the blue lever of the toner cartridge in the direction of the
Memo
Align the arrow on the lever with the arrow on the image drum.
If the toner cartridge is not securely attached, printing quality may decline.
18.
Close the top cover.
(Unlock) arrow until it stops.
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