Oki B412dn, User Manual, Page: 404 / 637

Estimated Replacement Cycle for Image Drum
When an image drum cartridge is close to reaching its lifetime, the [ORDER DRUM] message appears on the operator panel, and when it
reaches its lifetime, the [DRUM LIFE] message appears on the operator panel, at which time you should replace the image drum
cartridge with a new one. If you continue to print, printing stops when the toner runs low.
When using A4 paper, the estimated replacement cycle of an image drum is approximately 30,000 sheets. This estimation assumes the
standard use condition (three pages are printed at a time). Printing one page at a time reduces the drum lifetime approximately by half.
Aside from the number of prints per print job, temperature and humidity, paper type, and print density can also affect drum life; the
actual number of printed pages may be less than half the above estimation depending on the printing conditions.
Note
The print quality may deteriorate after 1 year following the unpacking of the image drum, prepare a new image drum.
Use Oki Data genuine consumables to ensure optimum performance of the products.
Using other manufacturers' consumables may reduce printing quality and/or other performance.
Charges will be incurred for services for problems caused by the use of consumables other than Oki data genuine consumables,
regardless of whether the problem occurred during the warranty period or maintenance contract period.
(Although use of non-genuine consumables does not always result in problems, use extra care when using them.)
Prints may become light temporarily after replacing the image drum. Printing will recover after running some print jobs.
Occasionally, print density may become higher after a long period of use. In such a case, on the menu of the printer, set
[DARKNESS] to [-1] or [-2]. Alternatively, with the printer driver, you can set [Printer Darkness] to [Light] or [Middle] to adjust
the print density. After replacing the image drum, return the settings to their original values.
When replacing the image drum, if you install the toner cartridge that has been in use, the [REPLACE TONER] message or [TONER
LOW] message may be displayed--have a new toner cartridge ready.
Toner level display may not be shown accurately until you replace the toner cartridge with a new one.
Even after [DRUM LIFE] is displayed, you can continue to print if you open and close the top cover; however, if toner runs out in
the image drum or a certain number of sheets are printed, printing stops to protect the printer.
In such a case, replace the image drum.
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