When you replace the drum unit with a new one, you must reset the drum counter by completing the following steps:
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DO NOT reset the drum counter unless you are replacing the drum unit.
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If you reset the drum counter without replacing the drum unit, the machine will not be able to correctly calculate the remaining drum life.
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Make sure the machine is turned on.
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Make sure the machine's cover is closed.
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Hold down OK as you press the Up arrow key.
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Press OK to select Drum.
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Press the Up or Down arrow key to display the toner color for the drum unit you just replaced, and then press OK.
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Press the Up arrow key to reset the drum counter.