Oki OKIPAGE24DX User Manual page 74

The image drum cartridge should normally last up to 30,000
pages for continuous printing or up to 19,000 pages at 3
pages per job. These numbers are approximate since you
won't print the same number of pages each time, and
environmental conditions and paper type used may vary.
When the image drum reaches 90% of its life, the CHANGE
DRUM message will display in the control panel window.
You should have a new image drum cartridge and a new toner
cartridge on hand at this point. Change the image drum
cartridge when the print becomes faint or begins to
deteriorate.
!
To replace the image drum, you need both a new image
drum cartridge and a new toner cartridge.
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E-74 OKIPAGE 18/24DX
Precautions
The image drum is fragile. To avoid damage to the new drum,
take these precautions while handling the new image drum
cartridge:
Avoid touching the green drum surface.
Be careful not to set the cartridge down on anything that
might scratch the surface of the drum.
Keep the drum from exposure to direct sunlight and don't
let it sit in room light for more than 5 minutes.
Leave it in the package until you are ready to install it in
the printer.