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Need Help Mutoh 1204 black ink static issue?

Discussion in 'Mutoh' started by krazycolors, Nov 20, 2019.

  1. krazycolors

    krazycolors New Member

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    Jan 10, 2013
    South Dakota
    Hello all.
    I have been trying to figure out this issue for a while now..I have attached a pic to better explain the issue. This is not always how it looks... I am getting very inconsistent black "overspray" only when I print black next to white(or no ink areas). I know if looks like there is ink from the rollers, but that it no the case. I have cleaned them along with the print head and maint station. When I do a nozzle check its always has a couple of the black small lines missing. They are not always the same lines missing, but seem to be towards the top of the nozzle check. If I had to guess what it is I would have to say maybe some of the black nozzles are plugging and spraying weird? One mutoh tech that I talked to mentioned it might have something to do with static? I have done all the cleaning possible to the print head except soak the print head face in solvent (tech said not to). Any other color or if there is color next to the black its perfect. I have tried 6 different medias with the same result. I greatly appreciate any advice! 20190906_000102.jpg
     
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  2. krazycolors

    krazycolors New Member

    6
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    Jan 10, 2013
    South Dakota
     

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  3. RustyNZ

    RustyNZ Member

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    Feb 22, 2017
    New Zealand
    Those lines that look like roller marks wouldn't be static or deflected (partly blocked) nozzles, you wouldn't get such a uniform pattern. Those could be the cause of the fuzzy edges on the text. Do they line up with the rollers? If you look at the letter D you can see those marks don't even follow the shape of the print they just continue in exactly the same place down the media. It is strange it only happens on your black on white, not sure why.
     
  4. krazycolors

    krazycolors New Member

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    Jan 10, 2013
    South Dakota
    The lines do line up with the rollers. The lines don't appear until the print head makes a pass over the media. There is always white(with no ink) media between where the print head is passing and the rollers. The rollers have been cleaned and completely dry. Its just weird this only occurs with the black ink.. All other colors are perfect. and black is good when there is color against it. Its just when there is no color or just white media.
     
  5. RustyNZ

    RustyNZ Member

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    Feb 22, 2017
    New Zealand
    Seems pretty odd to me, sorry don't really have any ideas. If it wasn't just where the rollers were then it could be some sort of electrical fault causing the heads to fire when they shouldn't but I don't see any reason why that would line up with the rollers as the head (and rest of the electrics) probably don't know where the feed rollers are located as they don't really have any reason to. With 6 different medias doing the same it's hard to blame the media too. I've seen roller marks on some medias and have to adjust temperature to resolve that.

    Please post up the resolution if you find one to help others. Good luck.
     
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