FAQ et Diagnostic
The toner cartridge or the drum unit and toner cartridge assembly is not installed correctly.
Remove the toner cartridge and drum unit assembly for the color indicated on the the machine's display (hereinafter called LCD), remove the toner cartridge from the drum unit, and reinstall the toner cartridge back into the drum unit. Reinstall the toner cartridge and drum unit assembly back in the machine following the steps below:
NOTE: Illustrations shown below are from a representative product and may differ from your Brother machine.
Close the top cover of the machine.