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  1. #1
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    Brother MFC 3770cdw Copy Quality Black Smudges

    Brother MFC 3770cdw printing black smudges. The smudges are only on left side of page. The black marks happen 10 times down the page. They are about 1 inch apart, and about 3 inches wide. Have replace toner and drum with OEM brother cartridges. Cleaned transfer belt, and led units above each cartridge. Any ideas? Thanks.IMG_0274.jpg

  2. #2
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Re: Brother MFC 3770cdw Copy Quality Black Smudges

    I would start by printing CMYK test pages from service mode.
    A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.

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    Re: Brother MFC 3770cdw Copy Quality Black Smudges

    I did do a color test pattern test. The problem is with the black cartridge. The colors are ok. Of course I got black marks on all patterns. Thanks.

  4. #4
    Senior Tech 250+ Posts driving lots of miles's Avatar
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    Re: Brother MFC 3770cdw Copy Quality Black Smudges

    I would check the fuser for damaged rollers.

  5. #5
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    Re: Brother MFC 3770cdw Copy Quality Black Smudges

    Thanks for the reply. I agree the fuser rollers are always one of the first things to check when having copy quality problems. Thanks again.

  6. #6
    Service Manager 1,000+ Posts Gift's Avatar
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    Re: Brother MFC 3770cdw Copy Quality Black Smudges

    the repeating pattern would indicate the toner roller/cartridge

    PS: there's a "diameter" list in all brother service manuals, pretty helpful

  7. #7
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Re: Brother MFC 3770cdw Copy Quality Black Smudges

    Quote Originally Posted by Gift View Post
    the repeating pattern would indicate the toner roller/cartridge

    PS: there's a "diameter" list in all brother service manuals, pretty helpful
    Agree:


    The pitch whichappears in the image:
    - Develop roller of the toner cartridge 29 mm
    - Exposure drum of the drum unit 94.5 mm
    - Heat roller of the fuser unit 78.5 mm
    - Pressure roller of the fuser unit 78.5 mm

    About 1 inch pattern is closest to Develop roller.
    A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.

    Blessed are they who can laugh at themselves, for they shall never cease to be amused.

  8. #8
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    Re: Brother MFC 3770cdw Copy Quality Black Smudges

    Thanks for your reply. I have determined the problem is with the mag roller in the toner cartridge. After trying two toner cartridges, checking and cleaning contact points it may be the HVPS not sure. Maybe I should try a third cartridge for good measure. Thanks again.

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