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Need Help Mimaki 3042HG black ink in yellow prints

Discussion in 'Mimaki' started by Subaoru, Nov 19, 2020.

  1. Subaoru

    Subaoru New Member

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    Sep 10, 2020
    California
    Continuation of my black ink in yellow print issue. (Mimaki 3042HG)

    Did a couple more test prints today - here is what I found:
    Printed a test square of yellow and black only, only notice the black streaking on the left of the left side squares, most notably at the very begining.

    [​IMG]

    Printed some plate frames, noticed that even if I printed a yellow rectangle off-site first (to get rid of initial black overspray), the actual print itself would still streak black.
    Furthermore, noticed the 16 pass would have about 4x more black streaks than 32 pass. (does this have to do with how often the printer touches the capping station?)

    [​IMG]

    Things I've changed/tried/tested:
    1) new dampers, however damper adapters have not been changed
    2) cap top suction has been tested, suction pulls fine
    3) YK and ClPr top caps have been swapped to see if it was potential sealing issue, no seeming change in behavior

    Other notes:
    the black contamination in the yellow on nozzle checks is seemingly random. It will usually always be there, but never on the same nozzles.

    Any advice on what it could be, and what I could buy/continue trying would be a great help, thank you!
     
  2. Subaoru

    Subaoru New Member

    6
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    1
    Sep 10, 2020
    California
    Some more photos to help -

    [​IMG]

    [​IMG]
     
  3. TD Digital

    TD Digital Member

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    Jun 1, 2020
    78650
    Is your wiper the blue squeegee style or the grey style? I usually attribute contamination to a poorly performing wiper. If it is a blue wiper the wiper position may be too high and it is smearing the ink across the head. If a grey old style wiper then perhaps the wiper is not square to the head or needs replacement.
     
  4. Subaoru

    Subaoru New Member

    6
    0
    1
    Sep 10, 2020
    California
    its the grey old style. we swapped it with another we had (not new) and still the same issue. I'll buy new ones and try again.
     
  5. TD Digital

    TD Digital Member

    30
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    Jun 1, 2020
    78650
    Is it dead center to the head when wiping? After a cleaning is the head clean and ink free?
     
  6. DesignCreate

    DesignCreate New Member

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    May 5, 2019
    Utah
    I just found your thread and am wondering if your head alignment is off. Have you checked that?
     
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