Oki MB492dn User Manual page 828

The toner cartridge is removed with the image drum.
5.
Unpack a new image drum.
6.
Remove the silica gel pack.
Note
Always use a new image drum. An image drum that has been used on another printer cannot be used.
7.
Align the guide posts (1) on the left and right sides of the image drum with their guide grooves (2) on
the left and right sides inside the machine, and then set the image drum into the printer gently.
8.
Press the toner cover removal button on the image drum.
9.
Remove the toner cover.
827