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  1. #1
    Senior Tech 250+ Posts
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    bizhub c452 stripes on black

    Hi, have someone a idea how to fix this problem?
    Have a look on the jpg. Format A3

    There are stripes every 5mm... on black print, on half tone. I mean the tiny darker stripes not in feed direction.

    What i have done to fix...
    New Drum, DV black, transferbelt, transferroller, clean the laserunit (disasembled and cleaned), played around with the voltages... clean the contacts from drum, dv and trans-belt-roller.
    Nothing helps.

    After switching back the old units, the first print was better, after the stripes come back darker.


    Can it be a mechanical problem from the drive?
    or should i try to change the boards? the prcb or the HV?

    picture on external hoster



    hostet from copytechnet (slow)
    Stripes.jpg

  2. #2
    Field Supervisor 500+ Posts
    bizhub c452 stripes on black

    minimerlin's Avatar
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    Re: bizhub c452 stripes on black

    Looks like pitch lines from drive gears/motors of the image unit. Have a check of these areas.

  3. #3
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    Re: bizhub c452 stripes on black

    Quote Originally Posted by occus View Post
    Hi, have someone a idea how to fix this problem?
    Have a look on the jpg. Format A3

    There are stripes every 5mm... on black print, on half tone. I mean the tiny darker stripes not in feed direction.

    What i have done to fix...
    New Drum, DV black, transferbelt, transferroller, clean the laserunit (disasembled and cleaned), played around with the voltages... clean the contacts from drum, dv and trans-belt-roller.
    Nothing helps.

    After switching back the old units, the first print was better, after the stripes come back darker.


    Can it be a mechanical problem from the drive?
    or should i try to change the boards? the prcb or the HV?

    picture on external hoster



    hostet from copytechnet (slow)
    Stripes.jpg
    I saw on some forum that will best compatible toner

  4. #4
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    Re: bizhub c452 stripes on black

    looks like the laser unit itself causing those 5mm lines, I have seen this on quite a few models and it always looks the same

    thankfully most people don't even notice.

  5. #5
    Senior Tech 250+ Posts Phrag's Avatar
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    Re: bizhub c452 stripes on black

    What Benny said.

    Every tiny imperfection on the Drum and Mag Roller surface comes out on those 128 halftones. But I've never had any ring about them.

    They aren't distinguishable on black text, and unless your printing large blocks of K only Gray, they won't be noticed.

  6. #6
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    Re: bizhub c452 stripes on black

    Quite possibly the print head... Let me know how it works out.

  7. #7
    Senior Tech 250+ Posts
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    Re: bizhub c452 stripes on black

    thanks all for feedback!

    I talked with a other technician who had this problem too. He told me he changed all the electrical boards and the problem persists.
    But this lucky guy changed the machine (rent after 4.5 years)... i can't change, it sould be run for a year again.

    @miguell
    we use never compatible toner.

    Yes, next step is to change M18 drive motor black drum or the PH-Unit.

  8. #8
    Step aside, noob 1,000+ Posts EarthKmTech's Avatar
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    Re: bizhub c452 stripes on black

    make sure the fusing loop sensor isnt snapped off or the fusing unit will run too fast and tug on the paper and upset the speed of the transfer belt.

  9. #9
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    Re: bizhub c452 stripes on black

    thanks for your hint @EarthKmTech

    But should i see the problem on the other colors too if it's the fuser?
    The other colors are ok...

    The fuser is changed anyway, broken surface of roller.

  10. #10
    Senior Tech 250+ Posts
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    Re: bizhub c452 stripes on black

    It is not the Laser... tested

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