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  1. #1
    Service Manager 1,000+ Posts
    wc7556 black is coming out gray


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    Thumbs up wc7556 black is coming out gray

    Color is coming out good but black is coming out gray. It is darker toward front of machine bust gets lighte as you go toward rear of machine
    so that last quarter of page is light gray. Customer changed toner but made no difference. I went there and customer had no drum in stock
    so I swapped with one which was at 70% as black was at 20%. Made no difference.

    There is about 375k in black count. I am considering changing black dv unit and developer. No fault codes. I would think if toner motor or dv unit
    were not turning there would be a fault code. Any advice is appreciated very much. Frank

  2. #2
    Service Manager 10,000+ Posts
    wc7556 black is coming out gray

    Phil B.'s Avatar
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    Re: wc7556 black is coming out gray

    Quote Originally Posted by axyun View Post
    Color is coming out good but black is coming out gray. It is darker toward front of machine bust gets lighte as you go toward rear of machine
    so that last quarter of page is light gray. Customer changed toner but made no difference. I went there and customer had no drum in stock
    so I swapped with one which was at 70% as black was at 20%. Made no difference.

    There is about 375k in black count. I am considering changing black dv unit and developer. No fault codes. I would think if toner motor or dv unit
    were not turning there would be a fault code. Any advice is appreciated very much. Frank
    with that many pages on it .. it sounds like the K Dev unit is dying... install new..calibrate .. they ARE using OEM toner correct?

  3. #3
    Service Manager 1,000+ Posts
    wc7556 black is coming out gray


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    Thumbs up Re: wc7556 black is coming out gray

    yes. using OEM and tried 2 different ones.Thank you Phil.

  4. #4
    Service Manager 10,000+ Posts
    wc7556 black is coming out gray

    Phil B.'s Avatar
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    Re: wc7556 black is coming out gray

    Quote Originally Posted by axyun View Post
    yes. using OEM and tried 2 different ones.Thank you Phil.
    2 different toners? go for the dev unit!

  5. #5
    Service Manager 1,000+ Posts
    wc7556 black is coming out gray


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    Thumbs up Re: wc7556 black is coming out gray

    Thanks, Phil

  6. #6
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    Re: wc7556 black is coming out gray

    Running sky shots can help determine the issues. See video below. I’d also try cleaning the led’s just because but like everyone said more than likely developer.

    YouTube


    Sent from my iPhone using Tapatalk

  7. #7
    Service Manager 1,000+ Posts
    wc7556 black is coming out gray


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    Thumbs up Re: wc7556 black is coming out gray

    Thank you Mr. Xerox . Your info and video is appreciated. Frank

  8. #8
    Service Manager 1,000+ Posts
    wc7556 black is coming out gray


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    Thumbs up Re: wc7556 black is coming out gray

    On Feb 8 changed black dv unit and developer and quality has improved significantly. Customer had said she had
    heard a loud noise on the right side of machine. She thought perhaps from rear of machine. She called Saturday
    saying machine called for magenta toner. She changed it and machine said magenta was empty and to changethough
    it was new toner.

    I was there yesterday and the magenta toner dispense coil was broken at the end where the gear sits at front of machine

    I ordered a toner pipe dispense assembly today. Looked in manual and does not show how to remove and replace. just shows

    toner motor dispense assembly in rear of machine. I did not look carefully yesterday to see how it would be removed as I did
    not know how part(s) were available until I checked manual. Would someone please enlighten me as I have not changed that
    assembly before. Frank

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