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JV33 Printhead flush methods

Discussion in 'Digital Printing' started by Andrew Signs, Nov 21, 2020.

  1. Andrew Signs

    Andrew Signs Member

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    Nov 24, 2017
    Australia
    Hi All,


    We have a handful of JV33's which as you can see from my previous post occasionally have a few weird things pop up. Thankfully for this forum much has been learnt!

    Question is in relation to manually flushing a head.

    Understand completely that this is frowned upon by some and ok by others. In this circumstance it is a head off a machine that we had replace in a bulk load therefore no real downside. The head was actually ok (was printing etc) but then sat for a few weeks out of the machine.

    As it didn't matter I thought I would try out the manual flush as mentioned on the forum (syringe) to give cleaning it a go. 6 of the 8 channels all cleaned up and perfectly clear flush comes up.

    Weird thing that happens to change 6 and 7. When you go to push flush in the number 6 it makes it to the head (you can see the flush start to drip) but under mild pressure actually shoots back up and out of the black nipple on channel 7. If you switch the flush to 7 it comes out of 6.

    First thing I did was swap out the memory board/full plastics and it still does it.

    The other thing I did was load a syringe to both 6 and 7 at the same time. As there is then pressure to both channels the flush comes out of the head correctly.

    It seems to me that there is some sort of back pressure issue that under pressure causes it to find the easiest way out, which unfortunately is up?

    Anyone has this happen or have and further ideas???


    Appreciate the help in advance!
     
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  2. balstestrat

    balstestrat Active Member

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    Aug 25, 2020
    Between the bits
    Is that for white ink to recirculate?
    Just put a plug to the other one..
     
  3. Andrew Signs

    Andrew Signs Member

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    Nov 24, 2017
    Australia
    Thanks balstestrat!

    If I plug the other one that may work. I still can't work out why it would happen.

    Also, if that works what's stopping inks mixing when all connected back up?
     
  4. balstestrat

    balstestrat Active Member

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    Aug 25, 2020
    Between the bits
    Well do you have two different inks running in those two channels?
    If you think it's not meant like that, it could just be broken internally as well...
     
  5. Andrew Signs

    Andrew Signs Member

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    Nov 24, 2017
    Australia
    Yes, there is two different colours to run on those channels...
     
  6. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Aug 2, 2011
    Denver, CO
    Whenever you flush one channel and it comes out of the other, the head is toast. The membrane that separates those channels broke so they will never properly print again. We always flush heads as a last resort for this reason but it sounds like that's what you were doing anyway.
     
    • Agree Agree x 1
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