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  1. #1
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    shadow on bold letters on Bizhub C550

    HI,
    I have Konica Minolta Bizhub C 550 ( 3 machines ),and on B/W print on PLAIN paper there is a shadow on letters (especially on BOLD ones ).
    If the print is set to thick 3 there is no shadow. On one of the C550 i change the second transfer roller,3 days the machine was fine,but now is the same situation (again shadow).
    Can anybody HELP me.

  2. #2
    Service Manager 1,000+ Posts
    shadow on bold letters on Bizhub C550

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    Re: shadow on bold letters on Bizhub C550

    Do you have the comb modification above transfer roller(very thick mylar comb)

    How old is the transfer belt?


    Have you played with 2nd transfer settings?


    Sent from my iDon't believe in marketing device using Tapatalk
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  3. #3
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    Re: shadow on bold letters on Bizhub C550

    Quote Originally Posted by habik View Post
    Do you have the comb modification above transfer roller(very thick mylar comb)

    How old is the transfer belt?


    Have you played with 2nd transfer settings?


    Sent from my iDon't believe in marketing device using Tapatalk


    The image transfer belt is NEW ( 1000 pages),and yes i've played with 2nd transfer settings(nothing yet).
    When i print the counter list the first page is OK but the second side is bad( on A3 paper first half of the page is good ,but the second half is shadowy ).
    All these things is on plane paper,when the tick is 2,3 the page is ok.
    the machine is in another town,so i don't now about comb modification above the transfer roller (is the modification on the roller or on the machine?)

    i think when i change the transfer belt ,the problem started.

  4. #4
    Service Manager 1,000+ Posts
    shadow on bold letters on Bizhub C550

    habik's Avatar
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    Re: shadow on bold letters on Bizhub C550

    Quote Originally Posted by tomislav View Post
    The image transfer belt is NEW ( 1000 pages),and yes i've played with 2nd transfer settings(nothing yet).
    When i print the counter list the first page is OK but the second side is bad( on A3 paper first half of the page is good ,but the second half is shadowy ).
    All these things is on plane paper,when the tick is 2,3 the page is ok.
    the machine is in another town,so i don't now about comb modification above the transfer roller (is the modification on the roller or on the machine?)

    i think when i change the transfer belt ,the problem started.

    Regards the modification this is what you need see photo.

    Have you checked for any damage on 1st transfer rollers as the holders sometimes crack or snap and cause issues.

    Other thing that came to mind is, try skew reset and see if it improves.


    C650 Modification Comb mylar.jpg
    .OK Google! ... will I need Berrocca this morning?
    Firmwares HERE

  5. #5
    Not a service manager 2,500+ Posts Iowatech's Avatar
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    Re: shadow on bold letters on Bizhub C550

    Um, I don't work on these, but is there any chance this could be a defective aftermarket toner problem?
    The clue for me was the changing of the paper thickness setting to fix the problem. I've used that to temporarily take care of some cold offsetting print defects caused by that issue.
    I've also seen something like this caused by plain paper that wasn't as plain as expected. But that's pretty unusual.
    For what it is worth, it might not hurt to see if the fuser is in good shape too.

  6. #6
    RTFM!! 5,000+ Posts allan's Avatar
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    Re: shadow on bold letters on Bizhub C550

    What is the Black TCR reading? Shot developer would cause this. And bad toner with the wrong charge characteristics. As the TCR value drops before replenishing the print could look ok and after replenishing the prints could be smudged. Try to look at the developed latent image on the drum and transfer belt. Also look for P-codes.

  7. #7
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    Re: shadow on bold letters on Bizhub C550

    Quote Originally Posted by allan View Post
    What is the Black TCR reading? Shot developer would cause this. And bad toner with the wrong charge characteristics. As the TCR value drops before replenishing the print could look ok and after replenishing the prints could be smudged. Try to look at the developed latent image on the drum and transfer belt. Also look for P-codes.



    There is no P codes

  8. #8
    RTFM!! 5,000+ Posts allan's Avatar
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    Re: shadow on bold letters on Bizhub C550

    Replace IU K.

  9. #9
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    Re: shadow on bold letters on Bizhub C550

    Quote Originally Posted by habik View Post
    Regards the modification this is what you need see photo.

    Have you checked for any damage on 1st transfer rollers as the holders sometimes crack or snap and cause issues.

    Other thing that came to mind is, try skew reset and see if it improves.


    C650 Modification Comb mylar.jpg
    There is no Mylar on the machine ( i have 3 same machines and all of them don't have the mylar ) can you help me and tell me the part number for the mylar,and no there is no damage on 1st transfer roller.
    Thanx for reply.

  10. #10
    RTFM!! 5,000+ Posts allan's Avatar
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    Re: shadow on bold letters on Bizhub C550

    A00H 7033 00 GUIDE PLATE, Get someone to verify this.
    This is the metal guide if it comes with the mylar i don't know. It seems that there are other seals on it as well.
    If its a modification then you need that part number.

    Guide Sheet part number : A00H703400.

    TAAU0800013EN00

    Hope this helps.

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