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JV3 160sp black dropping out after 3-6 passes

Discussion in 'Mimaki' started by Thomga, Aug 6, 2012.

  1. Thomga

    Thomga New Member

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    Oct 20, 2006
    This started about a week and a half ago. I am printing with Lyson inks, 6 color, so only 3 heads in use.
    The black will print fine for three to six passes on a 6 pass unidirectional profile.
    I have replaced the damper. cleared the line completely, multiple ink fills and head clean (ink drainer). I have also replaced the gasket on the brass fitting for the damper.
    I checked the head adjustment... looks good.
    I don't really want to replace the head since I just replaced head 2 about 3 months ago.
    Any suggestions?
     
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  2. J Hill Designs

    J Hill Designs Major Contributor

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    Sep 24, 2004
    new captop?
     
  3. dmcprint

    dmcprint New Member

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    Oct 25, 2010
    What does the nozzle test print look like?

    Replacing the damper was a good start. Typically, the damper is a likely culprit. Replacing the captop is also a good suggestion since it will only do a cleaning properly if there is a good seal on the captop. Remember, caps and dampers are considered consumable parts and need to be replaced from time to time.

    I would try swapping dampers from Magenta and Black. See if the problem stays with the black print head channel. If it does, you may have a cracked manifold on the print head. If it moves with the damper, then your problem is from the damper back.
     
  4. Thomga

    Thomga New Member

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    Oct 20, 2006
    Did you mean swapping out the caps?
     
  5. J Hill Designs

    J Hill Designs Major Contributor

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    no swap the line going into the head black for magenta - if your magenta head starts dropping out (with black ink running through it) it says its an ink line issue -- if they black head still drops (with mag. ink running through it) it is either the head or post head (captops, pumps)
     
  6. Thomga

    Thomga New Member

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    Oct 20, 2006
    do I want to contaminate the head like that?
     
  7. Thomga

    Thomga New Member

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    Oct 20, 2006
    I thought it was a bad idea to change inks through the head.
     
  8. artbot

    artbot Very Active Member

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    the different colors are all chemically, exactly the same. any contamination will be color only and go away in a few minutes. there's no other way to isolate this issue without doing a damper swap.
     
  9. dmcprint

    dmcprint New Member

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    Oct 25, 2010
    Any luck?

    It's safe to swap the dampers as part of troubleshooting. The amount of ink within a print head is very minimal and swapping dampers should not have an adverse effect as far as the ink is concerned. Also, take care not to drip ink on the print head boards.
     
  10. Thomga

    Thomga New Member

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    Oct 20, 2006
    going to try that now
     
  11. Thomga

    Thomga New Member

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    Oct 20, 2006
    same thing happened with the magenta...
    Guess it is the head after all.
     
  12. Thomga

    Thomga New Member

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    Oct 20, 2006
    just out of curiosity, could the tip that the damper connects to on the head be bad and is it possible to change just that part? I have 4 dead heads here in the shop. could save me a bundle on purchasing a new head.
     
  13. J Hill Designs

    J Hill Designs Major Contributor

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    Sep 24, 2004
    yes it could just be the head manifold. or it could still be the captop for the black head
     
  14. Thomga

    Thomga New Member

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    Oct 20, 2006
    I swapped out the captop with the unused head last night and again, same result.
     
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