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With my Brother 8840D I have had paper jams that when cleared would not delete from the display nor would the machine operate until I unplugged the machine for around eight hours. I guess it is a sort of reset or reboot.
That error happens when the left hinge in the back breaks and the scanner cover won't shut all the way. temporarily you can tape the switch that is above the hinge and when the error is gone the modes should change again. The hinge is #LP2403001.
Remove the toner cartridge from the drum casing using the release lever. The drum is not to be removed from the drum casing. Just rotate the drum using the side button until you see the dirt mentioned. Use cotton swab to wipe dirt off. Be careful not to damage it. If that doesn't work, you need a need drum which is closely the same price as getting a toner cartridge. Refer to your Brother MFC 8840D manual that came with the machine. Alternatively, you can refer to the online manual.