Question about Brother MFC-9420CN All-In-One Laser Printer

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Brother MFC9420CN Toner Error-Incompatible Toner Detected

I refilled the black cartridge on my Borther MFC9420CN printer. It worked great for awhile. But all of a sudden one day it stopped printing and gave an error code (Toner Error-Incompatible toner detected).

When I removed the cartridges, black toner was everywhere. The cap was very loose when I replaced it, and it had fallen into the cartridge.I fished it out and reseated it.

I have rebooted, taken the cartridges out. I continue to get the same error.

I called Brother and they told me to replace the cartidge. Those things cost $169. That is why I refilled it in the first place.

My best guess is that there is a preset on the cartridge, or on the machine, that will allow only a certain number of prints per cartridge so that the Brother Cartridge Mafia can extort more money out of people by making them throw away a perfectly good cartridge.

Can anyone tell me how to get around buying a new cartridge?

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  • aated Nov 04, 2008

    hello i have the same problem

    1 + 7 did not help me

    i still have the same massage

  • gigahtz Nov 07, 2008

    I have the same toner error and i have replaced all the cartridges. I also downloaded the service manual and it say to use only Brother cartridges. i also did the reset that was described, and i still have the error.

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2 Answers

Since this machine takes TN04 cartridges, and there are no chips or anything, do a reset.From memory press 1 and 7 together, then 1.

Posted on Apr 14, 2008

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Ok i hit 1& 7 at the same time and pressed 1 to reset opc belt, then i hit 2 and 8 at the same time and pressed 1 to reset fuser. i took each of the catridges out vacum cleaner them and then on the right side rotated the cylinder a few times to ensure they were locked as i notticed some toner being released. (did this for all toner cartridges). I then put them back in and the system reset and strated printing. I believe the later cleaning and rotatiing the cylinder of the catrridge did the trick. Hope this is helpful.

Posted on Feb 08, 2009

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Posted on Jan 02, 2017

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