This message would appear if the drum unit is near the end of its life. Use the drum unit until you have a print quality problem, then replace the drum unit with a new one.
This message would continue to appear if the drum counter was not reset when you replaced the drum. To reset the drum follow the instructions below:
Press the cover release button and then open the front cover of the printer.
Press and hold down the Go button until ">>>>DRUM CLEAR" is displayed, and then release the Go button.
Close the front cover.
Reset the drum counter only when you replaced the drum unit with a new one.
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