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  1. #1
    Technician Love Konica's Avatar
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    Konica c70hc - wrong color

    Hi all,

    Customer 's machine prints with yellow color on every print sheets, please see the upload image. I have changed drum and corona but nothing changes.
    c70hc-1.jpg
    when I print test page, every thing is ok
    c70hc.jpg

    Please help me, thank you.

  2. #2
    Field Supervisor 500+ Posts
    Konica c70hc - wrong color


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    Re: Konica c70hc - wrong color

    looks like your printing black and white in color...

    make sure rich black is not turned on in the advanced setting.

    IF you have rich black on in a grey scale photo you may get some fine registration marks off base....

    also Konica use yellow for color registration.

    are you printing from a computer, or right from the rip using a pdf workflow???

  3. #3
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    Re: Konica c70hc - wrong color

    Thank methogod, my file is not B&W, yellow approximate 15-20%, even when I print color file the yellow still appears.

    I print directly from a computer (to rip), not using workflow.

    Thank you.

  4. #4
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    Re: Konica c70hc - wrong color

    Any more ideas, help me please. Thanks in advance.

  5. #5
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    Re: Konica c70hc - wrong color

    Toner from the developing cylinder is actually touching the Y drum. Increase the space between the drum and developing unit. Decrease the size of the developing brush, adjust the skimming blades gap.

  6. #6
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    Re: Konica c70hc - wrong color

    U could try to increase the gap, by putting some tape around the 2 wheels left en right of the developer roll. It pushes the drum a tenth of a mm away.

  7. #7
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    Re: Konica c70hc - wrong color

    Quote Originally Posted by KM1Amsterdam View Post
    U could try to increase the gap, by putting some tape around the 2 wheels left en right of the developer roll. It pushes the drum a tenth of a mm away.
    Thank you, I have tried your way. It take a good results. Thanks all, especially KM1Amsterdam.
    Hope everyone who has this case can read this thread.

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