Oki B820N Setup Instructions page 107

5
Install the image drum to the
printer.
Align both guide posts of the drum with their
guide grooves on the printer, and gently put
the drum into the printer.
Guide Post
6
Close the top cover.
When "CHECK IMAGE DRUM / 543:TONER SENSOR
Note!
ERROR" is displayed, be sure to turn the knob in
the direction toward the lock mark ( ) until the
knob stops.
Guide Post
Guide Grooves
Replacing the Image Drum
3
107