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

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Magenta streak running length of paper

There is a bad spot on the magenta toner cartridge TN 110 - is there a way to clean the cartridge? It's not close to being empty so I really don't want to buy a whole new cartridge.

The model is Brother MFC-9840CDW

Any suggestions will be greatly appreciated.


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  • jjpup Mar 07, 2009

    Only my magenta toner streaks, too.  That's odd and cannot be just a coincidence.



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Have you tried cleaning the corona wire?  You can also use a cotton swab and clean the drum.  Just be sure to unplug the unit from the wall and allow everything to cool down.

Posted on Dec 02, 2008

  • fixitden Apr 01, 2011

    Cleaning the Corona wire is the first thing to try. If this does not work look at the drum on the cartridge. I noticed streaks on mine. The streaks lined up with the streaks on the printed paper. I took off the wiper blade which resulted in a mess of spilled toner. (I thought I was being careful and shook the toner away form the drum but it did not shake away. What I sas was a rotary stiring/distibutor rake with lumps of toner in the rake. I cleaned the wiper blade repaceand it still streaked. I noticed that shaking the cartridge and turning the driver gear that turns the rest of the gears with a large flat screwdriver helped some. (note turn it clockwise only because I turned it backwards on a xerox drum broke a flap). Seeing the inprovement I filed a driver rod and turned the gears at about 2 rps / 120 rpm for about 5 min and the drum had a even coat of toner and no more streaks when using it. ( PS reset your toner left clock.)
    If anyone find a website that shows the proper names of the parts and/or how these parts work please add the website.



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