Oki C 9400 User Manual page 315

Caution! Be sure to push the lock lever all the way back. If it is not pushed back
and you close the cover, the lever could damage the LED printhead.
12. Remove the LED lens cleaner (supplied with the toner) from its packet and use it to wipe
the corresponding LED head clean.
13. Close the cover and turn the printer back on.
Important! After the drum/toner is installed, the CHANGE XXX IMAGE DRUM message
should disappear from the display. If it doesn't, try printing a page. If it still doesn't
disappear, reinstall the drum.
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