Question about Brother MFC 420CN All-In-One InkJet Printer

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Brother MFC 420CN displays error message "Unable to Change"

Says to See Troubleshooting and Routine maintenance in User's Guide. I did that and followed all the instructions and still no luck. It won't do ANYTHING but keep displaying this message. I refilled all the ink cartridges with generic ink. Could this have caused the problem? It printed 4 pages just fine then just quit. I also called the toll free number in my user's guide. They had me do a few things (that I had already done) and then it displayed error 4F. They told me it has a mechanical problem and needs to be serviced. HELP!

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  • rtrex Dec 08, 2008

    I have the exact same problem but I have Brother ink cartridges. Can you please email me at amonroe@carlsbadusd.net if you find the answer!

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Access the internal maintenance mode by pressing the Menu/Set button, then press * 2 8 6 4 within 2 seconds. This should put you in the maintenance mode menu. Enter 80, then scroll down with the arrow down (round) key. You'll find an entry listed as purge count. If number is over 6000, enter 2 7 8 3.

This will reset the purge count value. Then the printer will restart, hopefully without the annoying cannot clean message.


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Posted on Apr 25, 2010

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