The toner cartridge has been replaced, but one or several of the listed print quality problems are still present. Please replace the drum unit if the message is still displayed. After that, you must return the cleaning tab to the marked home position, and then reinstall the drum unit and toner cartridge assembly. You should remove the drum unit and toner cartridge assembly from the Brother MFC-7220 Multifunction Center, and then slide the blue cleaning tab along the channel on the top side of the drum unit. The message is displayed on the LCD – The installed drum unit has been exhausted or the primary corona wire needs to be cleaned. Therefore, you should install a new drum unit soon. You can continue printing, but please be aware that print quality will be gradually decreasing. The message is displayed on the LCD – The printing resource of the installed drum unit is nearly exhausted.
You should replace the installed drum unit in the following circumstances: The actual useful life of this component depends on various subjective factors such as the average number of pages printer per task, paper type, humidity, temperature, average percentage of page coverage, etc… You can check the remaining printing resource of the installed drum unit (presented/displayed in percentages) by pressing – –. The drum unit installed in your Brother MFC-7220 Multifunction Center is a user-replaceable component.
