When your OKI prints for a preset amount of pages it will prompt you with the message "DRUM LIFE END" warning on the LCD display and lock the imaging drum unit. If your Imaging/drum unit is still perfectly good, why waste the money for a new one? Just replace the fuse.

Replacing the fuse will reset the drum counter back to zero and you can continue using the machine.

The reset will not fix any print defects

One fuse required per imaging unit.

Each fuse lasts for one cycle, after which they must be replaced again.