Many printer manufacturers have a built in counter on the drum cartridge in their laster printers. This is so that the drum cartridge will get replaced at a regular interval and remain in good condition. The drum can in many cases continue to function a long time after the counter has expired. It is possible to reset the counter in the drum cartridge to extend it’s life. Then you can wait until there are marks or faded patches on the printed pages before you replace the cartridge. In some cases I have been able to reset the drum cartridge 3 times, extending the life of my cartridge to 400,000 copies instead of the the recommended 100,000.
Here’s a video hot to reset a drum cartridge. It doesn’t take long.
You need to buy a drum resetter that is specific to your printer.
Here is an example. It costs around $100 and will do an unlimited number of resets. It is easy to use as this video above illustrates. A new drum can cost around $250 so $100 for a resetter is very economical!