Question about Brother MFC 7840W Printer

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I had new tonner cartridge installed and it still says tonner life ended

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The toner cartridge in this machine has a gear assembly that resetting the "toner empty" light, it is build in a way that after resetting the printer it "disabling" the gear, so no second reset is possible. If you install the new cartridge previously and took it out it already run the reset cycle and will not be able to reset the printer even if it full with toner. Some time the gear reset system will not reset even if it is new. If you reset the gear and the light comes back your cartridge is empty.
You can open the gear cover on the toner cartridge and reset the gear to the original position it is not a big deal, but don't hold me liable to your technical ability. The reset gear is the most right gear behind the "window" on the right side of the cover, when you are holding the cartridge with the gear housing in front of you. Good luck.

Posted on Dec 14, 2010

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Posted on Jan 02, 2017

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