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  1. #11
    Senior Tech 100+ Posts D Colour's Avatar
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    Re: Bizhub C454, Cyan background/ghosting

    Quote Originally Posted by Quatro View Post
    Hi,

    When you stabilize it shows NG or no?
    Its NG - no good.

    Everything that has a beginning, has an end.....

  2. #12
    Service Manager 1,000+ Posts
    Bizhub C454, Cyan background/ghosting

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    Re: Bizhub C454, Cyan background/ghosting

    Quote Originally Posted by Quatro View Post
    Hi,

    I think you have problem on HV.
    When you stabilize it shows NG or no?
    NG Can happen as well when background is set to max.

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  3. #13
    Service Manager 1,000+ Posts
    Bizhub C454, Cyan background/ghosting

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    Re: Bizhub C454, Cyan background/ghosting

    Quote Originally Posted by D Colour View Post
    Hi Habik, thanks for the info.

    There is 447k on the colour devs, so they are far away from needing changed anyway. Will try the above and see how that goes.
    OK let us know.

    If you have spare HV and K Dev, take it.

    Before you start changing bits can you print CMYK gradation test and halftones around 60?

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  4. #14
    Technician Quatro's Avatar
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    Re: Bizhub C454, Cyan background/ghosting

    Quote Originally Posted by D Colour View Post
    Its NG - no good.


    Better test the HV and as much as possible if you cab change the DV unit of cyan,
    As per your sample Cyan is some what like over toner,


  5. #15
    Field Service Engineer 1,000+ Posts
    Bizhub C454, Cyan background/ghosting

    copier tech's Avatar
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    Re: Bizhub C454, Cyan background/ghosting

    Quote Originally Posted by habik View Post
    OK let us know.

    If you have spare HV and K Dev, take it.

    Before you start changing bits can you print CMYK gradation test and halftones around 60?

    Sent from my Mi A1 using Tapatalk
    Poster is using compatible toner, I would always suspect that first before looking at a hardware issue.

    Let us eat, drink, and be merry, because tomorrow we may die!

    www.copierfirmware.co.uk

  6. #16
    Field Supervisor 500+ Posts Desert Rat's Avatar
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    Re: Bizhub C454, Cyan background/ghosting

    I agree with copier tech, set it up with oem toner and fresh developer. Aftermarket products can work well
    but if a bad batch gets out, it can be very confusing.
    Many times my assumptions have led me down the wrong path.

    DR


  7. #17
    Service Manager 1,000+ Posts
    Bizhub C454, Cyan background/ghosting

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    Re: Bizhub C454, Cyan background/ghosting

    Quote Originally Posted by copier tech View Post
    Poster is using compatible toner, I would always suspect that first before looking at a hardware issue.
    Good point, assumed he'd go with that after vacuuming the hopper as suggested above. Let's wait and see.

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  8. #18
    Trusted Tech 50+ Posts Zesti's Avatar
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    Re: Bizhub C454, Cyan background/ghosting

    I agree with Habik and other guys suggestions. I can see bad cyan DV unit and the ghosting mostly related to HV. Also check the PH unit and it's connection with relay board.


  9. #19
    Service Manager 1,000+ Posts
    Bizhub C454, Cyan background/ghosting

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    Re: Bizhub C454, Cyan background/ghosting

    Something else occurred to me regards to ghosting. Is the erase led strip lighting up for cyan?

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  10. #20
    Senior Tech 100+ Posts D Colour's Avatar
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    Re: Bizhub C454, Cyan background/ghosting

    Just an update.....

    Had another tech look at the machine, they replaced the transfer belt and roller. This made no difference until they adjusted the Cyan image background voltage (set from 0 to +3) and this seems to have fixed it for now. This was a week ago.

    Voltage -5
    Voltage -5.jpg

    Voltage 0
    Voltage 0.jpg

    Voltage +3
    Voltage +3.jpg

    Voltage +5
    Voltage +5.jpg

    The transfer belt was over life (2 times nearly). I wonder if it was somehow screwing with the voltages. I've seen a bulletin about units past their life giving issues to other components.

    Hopefully this is resolved.

    Edit - Heres the bulletin. thanks to copier tech for previously posting this.
    Failure of Image Unit or Developer Unit.pdf

    Last edited by D Colour; 1 Day Ago at 05:23 PM. Reason: Bulletin
    Everything that has a beginning, has an end.....

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