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My Brother MFC 9840CDW recently started producing copies with random, mutli-colored streaks on the far right side of each page. Any thoughts as to what the cause may be? Much Thanks! Ben

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  • bjkirksey Oct 24, 2010


    Thanks for your input. I've tried everything you suggested except taking the fuser apart to clean it. I did, however, take the fuser out and clean the roller with alcohol. After reassembling everything and testing my problem is now noticeably worse than before. What are your thought please? Thanks Nonontech!




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There are few possibilities, 1. Leaking Cartridges, 2, Waste Ink Tank on the drum is full, 3, Fuser unit, 4. Dirty Paper passage (splattered toner).

First remove all the papers, cartridges, drum and the fuser unit, inspect all the cartridges and clean them (the drum bars) with a light/soft feather, be careful while doing this and don't ever touch them with your hand.

Next clean the drum, instructions here (click here)

After they are cleaned, remove the front tray, get a blower or an air can and blow the passage from front to back and vice versa with the blower. Clean all the chips on the cartridges and on the drum. Do whatever you think is good and might be helpful.

Also clean the fuser and the maintenance kit (inside the fuser), wipe away all the wasted/stuck toner powder and reseat it properly.

Once everything is done, install all the components. Now try printing, if the problem persists, let me know.

Good luck.

Thanks for using FixYa.

Posted on Oct 16, 2010

  • Lebanon Raingam
    Lebanon Raingam Oct 24, 2010

    I am afraid.. it seems you've made a small mistake when you say "...clean the rollers with alcohol..". Actually, you shouldn't clean the roller with anything, instead with a soft cloth or a brush. Even water isn't recommended and most of all Oil could damage them permanently. They look simple and ordinary, but there are number of pores (tiny holes). I also have a little doubt about this roller, do you mean the long bar that extends the length of the fuser? If it is, there's another greater problem. It shouldn't be cleaned that way, but only with brush or feather.

    Well, done is done, we have to go ahead. When I refer to your reply, the problem is most likely with the Fuser since the problem worsens after cleaning the roller(s). From your end, you can only disassemble the unit and make sure everything is cleaned (once again), but this time, don't ever use any solution but only with a soft cloth. Do not open the unit if the printer is not left Off for at least 30 minutes, you may damage the components and you know it's hot enough to burn your hair...:-)

    After cleaning all the fuser components properly re-assemble it and reinstall. If this isn't successful, your last second option is replacing the Fuser and your Final option is "Contact Brother". I hope you understand.

    Once again Good luck and let me know if you need further help from my side.



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