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Mimaki UCJV300-160 patchy printing

Discussion in 'Digital Printing' started by adsababy, Jan 8, 2021.

  1. adsababy

    adsababy New Member

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    Mar 31, 2020
    Cambridge UK
    Hi, hoping someone can help

    I have a Mimaki UCJV 300-160 and am now seeing patchy prints, especially noticeable on block colours, mainly darker blues (always the worst flat colour). I have had the Air Purge error come up quite often so have gone through the process but it still reappears. The machine is out of warranty now so any advice would be helpful, it happens on all medias, see photo.
     

    Attached Files:

  2. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    How's the nozzle check look?
     
  3. adsababy

    adsababy New Member

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    Hi, the nozzle check is fine, at first I thought this too but all looks ok
     
  4. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Sounds like maybe an ink flow issue. I'd probably start by adjusting the positive and negative pressure to make sure it's within range. Also, do you see air coming out during the air purge or is it solid ink?
     
  5. adsababy

    adsababy New Member

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    Mar 31, 2020
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    Interesting because I have also had errors relating to negative and positive pressure, problem is that I have no idea how to adjust this. I cant see air as the tube is so dark with ink, it's not easy to tell so I just do at least two purges per ink.
     
  6. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    I would see about getting a new purge line. If you can't see through it, it's probably clogged. As far as adjusting the pressure, it's in the service menu under the Test sub menu. The machine will beep slowly if it's too low and fast if it's too high. No beeping is what you're trying to achieve. I'd see if you can get your hands on a tech manual. I'm not allowed to give them out.
     
  7. adsababy

    adsababy New Member

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    Thanks so much, I will try and get hold of the manual and report back what I find
     
  8. zopylote

    zopylote Member

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    Katy, Tx
    this is not ink problem related... check media is coming bowed (waves)
     
  9. adsababy

    adsababy New Member

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    Mar 31, 2020
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    What could be the cause if it is media related? It happens on at least three different materials and although you cant see on the photo there is a colour difference, i.e less cyan in the patchy parts.
     
  10. White Haus

    White Haus Formally known as RJPW..........

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    I've had this happen sporadically on our 1 year old UCJV. Nothing that bad but just assumed it was some kind of ink starvation.
     
  11. adsababy

    adsababy New Member

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    Did you manage to find out what was causing it?
     
  12. kbrys

    kbrys New Member

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    May 22, 2009
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    We have a 2 year old UV300-160 and it started doing the same thing most noticeable in blues about 3 months ago. I have no other errors and issues like the air purge error you are getting. We have replaced numerous motors, boards and ribbon cables ( no heads yet) without any improvements. Drop position and nozzle checks all look good. Coming from higher up the chain at Mimaki they think they have found the issue and believe it has to do with voltage to head. Which they say can be adjusted on the machine. Our tech was out last week and printed some more test that were shipped out. I will watch and update if a solution is found on our machine.

    Kerry
     
  13. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    If you are still getting air pressure errors, that's a sign they are out of range and/or there is a leak somewhere preventing the system from pressurizing correctly. The machine uses negative pressure to pull ink from the cartridges to the sub tank and then switches to positive when printing. If it's not pressurizing properly, you will get drop out like this. You might need to bring a tech in. I'd agree with media buckling but the drop out is happening in the scan direction which is not usual for buckling media.
     
  14. White Haus

    White Haus Formally known as RJPW..........

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    No I haven't, sorry. It definitely hasn't been as bad as yours and has been barely noticeable to anyone other than me. Still kinda bugs me though.

    Hope you get your issues sorted out!
     
  15. adsababy

    adsababy New Member

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    Mar 31, 2020
    Cambridge UK
    Thanks for the info, I am hoping it wont be a long process to fix it as it is now out of warranty, as Solventinkjet has said, it seems to be linked to positive and negative pressure. I have an engineer out on Wednesday so will report back on progress. Be very interested to hear back if you get yours resolved :)
     
  16. adsababy

    adsababy New Member

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    Mar 31, 2020
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    I think I can discount the buckling as it only shows in certain colours, I have an engineer out on Wednesday so I will report back findings and also nudge him to look at what you have mentioned, thanks for the info, really appreciate it.
     
  17. Hamster

    Hamster Member

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    such a problem may be due to unstable media feed. Do several tests in a row on media comp
     
  18. adsababy

    adsababy New Member

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    Ok, so the engineer has just left without a fix. He performed an air purge and said that there was excess air in the head. He tested the negative and positive pressure and the positive pressure was set too high, he readjusted it to the correct setting but when testing, the machine errors 'not enough pressure'! so he has said unless I get an extended warranty it will cost a fortune to diagnose as it is not clear where the problem is. To be honest I might just get them to take the machine away and get a solvent instead.
     
  19. balstestrat

    balstestrat Active Member

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    Between the bits
    I would take apart the air system and clean it well. Checking sub tank as well that it's looking good and not leaking air.
     
    • Agree Agree x 1
  20. adsababy

    adsababy New Member

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    Mar 31, 2020
    Cambridge UK
    Thanks, I will have to get the engineer to do the work as I have no idea how to do this and risk damaging the machine, looks like its going to get pricey
     
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