Just change the cartridge or refill it again with the proper toner,else u have fault at the toner sensor or the toner itself,else u have no connection between the cartridge and the M/C DC controller, else your M/C DC controller faulty
SOURCE: Need to reset 'Drum near end' warning on Brother MFC-8460N.
Open the front door
Press clear
then press 1
SOURCE: Brother MFC 7820N Toner life end with new toner
I found the following post on another site. It appears to work.
If you want to reset your Brother MFC 7820N machine so you no longer have the error message: Toner End of Life, do the following:
1. Open the front cover of the 7820N, that is, the cover that allows you to pull out the toner and drum, but don't pull out the drum/toner.
2. Push the button: Options (located on the left of the control pad).
3. Type: *00 on the keypad.
The Brother MFC 7820N should be reset and the Toner End of Life message should disappear.
WARNING: This may void your warranty and ultimately damage your machine if you are reusing or refilling your cartridges, but you should already know that. Hope this helps.
SOURCE: reset drum - brother mfc-8860dn
Open front cover
Remove drum unit and toner cartridge assembly
Put drum unit and toner cartridge assembly back in machine, but do no close front cover.
Press Clear/Back
You will get a message "Replace Drum?"
Select Yes to confirm
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