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UJF - 6042MkII Clear/Primer head Clogged

Discussion in 'Mimaki' started by abbey.b, Oct 11, 2019.

  1. abbey.b

    abbey.b New Member

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    Oct 9, 2019
    Ohio
    So before i took over this mimaki I guess they have spray back issues and it clogged the Primer/Clear Head.

    Does any one have any advice on fixing this?
     
  2. Susan Stewart

    Susan Stewart Member

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    Mar 1, 2018
    Indiana
    I have a different Mimaki, so I'm not sure if these are options for you or not. Have you tried a nozzle wash? You can also do a soak on the head using the F-200/LF-200 washing fluid. I know primer and clear are stickier inks.
     
    • Like Like x 1
  3. abbey.b

    abbey.b New Member

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    Oct 9, 2019
    Ohio
    I have tried this a few times and no dice :(
     
  4. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Aug 2, 2011
    Denver, CO
    In my experience, once a UV head has been cured shut, it's virtually impossible to open up. That being said, Global Garage does have a service to flush heads and I have heard of people having success. Globalgarage.com is the site I am pretty sure.
     
    • Like Like x 1
  5. Are you getting any spray at all out of that head ? You can do a Nozzle wash and let it sit for a while to soak - Maintenance , Station , Nozzle wash - fill the cap with F200 fluid and set soak time to max then see if it cleared anything - you may have to do it several times - You should look at the bottom of the head and clean it with a swab and fluid . Sometimes you can luck out and the soak will loosen it up to get it with the swab .
     
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  6. chromira

    chromira Member

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    Apr 29, 2009
    Hawthorne, NY
    We had the same issue with our JFX-200 and soaked and soaked for days and ended up having to replace the printhead.
     
  7. frankubilluz

    frankubilluz New Member

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    Oct 4, 2019
    Peru
    You should let the print head rest in FL007 which is more aggressive than F200, if this flushing liquid doesn´t work, you should replace printhead and consider if you really need this feature in the printer, because this will happen again if you don't use this feature or if you don't have the precaution to clean very deep
     
  8. Texastech

    Texastech New Member

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    Oct 21, 2019
    Dallas
    White/clear head gets clogged in a uv printer the heads done. That’s why with specialty colors if your not going to use it that often p, make sure you still have a file you can push that type of ink threw to ensure it doesn’t happen again.
     
  9. Sony

    Sony New Member

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    Jan 29, 2020
    Indonesia
    Hai. I'm using Mimaki UJF 6042 MKII also and have same problem with primer head clongging. I already replace the print head several time bacause of this problem (maybe every 6 months). is there any suggestion how to make the print head primer last longer? Note : I already clean it with special wash solution from Mimaki and do nozzle wash once per week as the recommendation.
     
  10. TA04

    TA04 Member

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    Feb 28, 2015
    Switzerland
    wich wash solution?
     
  11. TD Digital

    TD Digital New Member

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    The Pr200 and Clear head is notorious for clogging on the MKII and what's worse is with FW version 4.2 and above they reduced the custody wash time to 10 mins. According to Mimaki they found that long custody washes actually deteriorate the nozzle face and cause damage long term. What I like to do is perform a custody wash and instead of inputting the soak time just leave the screen flashing and you can soak indefinitely without the pumps cycling.

    More than likely the head is toast but I have had luck on some of our units actually scrapping the nozzle face with a lint soft rag and the F200 and I have seen globs of gelled up ink come off. If head replacement is not an option you can run your primer layer as a separate print at a much higher pass level.

    If you do replace the head you will need to perform the custody wash and manually wipe the heads daily to prevent it from happening over and over. I have sadly replaced upwards of 2 dozen Primer/Clear heads on the MKII platforms.
     
    • Informative Informative x 1
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