There is a very good chance that your brand new cartridge is defective. If you have another cartridge put that in and see what happens. If the second cartridge works and the first didn't then it is for sure a defective cartridge.
There is nothing on Brother's website referring to this situation, so I would bet that it is a defective cartridge.
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Popular Solutions for Brother MFC-420CN All-In-One
I was unable to clear the error message ''unable to clean'' on my Brother MFC 420CN, and I ended up...
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I was unable to clear the error message ''unable to clean'' on my Brother MFC 420CN, and I ended up taking it to a Brother service centre here in Toronto, where they said the problem was that it had hit the maximum paper count, which they re-set, and it is now fine, and the technician said it ought to be for several years. I did not learn how to do it myself, so if you wanted to put up an answer about this and how to do it yourself, that would be appreciated. I did not find any reference in my search of the web about my problem which mentioned the page counter.
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