Thank you for using the Support Forum. Try this, turn off the machine, remove the black toner drum cartridge, power the machine back on without the drum cartridge in the machine. When the machine powers on you should get a message stating that that the drum cartridge is missing. Power off again and follow the steps for installing the drum cartridge making sure to clean the laser lens. If the error continues please consider contacting your support centre for further assistance.
Thanks, CherylO-Xerox Community Manager
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