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JV33-bad print head?

Discussion in 'Mimaki' started by MikeD, Sep 17, 2012.

  1. MikeD

    MikeD Active Member

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    Oct 25, 2011
    I have been having magenta ink droplets on the first few passes of each print. Directly after cleaning, the head looks perfect...a few minutes later drops a magenta start to form. I can see it happen when the head is moved away from the capping station to the far side of the platen with the cover removed. that tells me it's not the cap head or pump..could be a damper but I do not know how to judge the health of a damper by looking at it.

    Does this indicate a tear in the print head's membrane?

    Last week, there were several head-scrapes due to running media at too high print temps.

    Thanks for your input!
     
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  2. MikeD

    MikeD Active Member

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    Oct 25, 2011
    the corresponding damper has a bulge on the side unlike any of the other dampers. Makes me think that's where the problem emanates.

    Can that single part be replaced, or is there more to it than that?
     
  3. Robert M

    Robert M Very Active Member

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    Damper

    Change the damper, but why is there a bulge, are you running bulk ink?
     
  4. k.a.s.

    k.a.s. Very Active Member

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    Start with dampers and a cap. If its been a long time just replace all the Dampers while your at it. Change those first then, go from there.


    Kevin
     
  5. 4R Graphics

    4R Graphics Active Member

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    Sounds like a dampner problem.

    Change the dampners.

    We change dampners a few times a year they are cheap and next to the cap they are the biggest problem makers.
     
  6. MikeD

    MikeD Active Member

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    I first changed the cap top since I happened to have an extra on hand. I have ordered a replacement damper to replace the one that bulges out on the side. Not sure what caused the bulge; we run OEM inks on all printers and do not have a bulk ink system (yet.)
    This particular JV33 is about 3 yrs old and has been running two shifts per day; 6-7 days/wk... with almost all original parts.

    Just got a call from our vendor and was told that I would receive a new damper by 10am this morning...anyone have directions on how to replace dampers?

    Thanks!
     
  7. MikeD

    MikeD Active Member

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    Just received the replacement damper. Is it normal for a new damper to have ink (black) already in it? Do the parts get pressure tested before they are sold or something like that? I'm hesitant to put this part in...
     
  8. k.a.s.

    k.a.s. Very Active Member

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    I have never had dampers with ink in them, I don't think I would put that one in.

    Kevin
     
  9. MikeD

    MikeD Active Member

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    ordered a new "new" damper. The first had about 2cc of black ink already in it.

    Thanks for the advice.
     
  10. Robert M

    Robert M Very Active Member

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    dampers

    Don't use that damper, it could be water based ink in there for all you know.
    We have new ones at www.solventinkjet.com
     
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