Welcome To Signs101.com: Largest Forum for Signmaking Professionals

Signs101.com: Largest Forum for Signmaking Professionals is the LARGEST online community & discussion forum for professional sign-makers and graphic designers.

 


  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Cyan and Black on the left channel stop firing during production.

Discussion in 'Mimaki' started by mustafade, Jun 20, 2011.

  1. mustafade

    mustafade Member

    202
    0
    0
    Aug 13, 2010
    Hello Everyone,

    I just finished a 330" banner printing, 165"x2 non stop.
    I noticed a color shift on the print out where 2 or 2.5 feet was left to finish the job.
    As soon as it finished printing, I did a test draw and there it was, no CYAN and BLACK on the left channel.
    Afterward, I did a normal cleaning and they came back. Is this a indication of it needs a capping station alignment?

    Thanks for ya'll s input.
     
    Tags:
  2. Gabriel

    Gabriel Member

    275
    0
    0
    Apr 7, 2011
    Maybe you'll need a new capping station. If the problem will come back shortly after a manual cleaning, then you'll have to replace that.
     
  3. Rooster

    Rooster Very Active Member

    1,209
    2
    38
    Feb 22, 2008
    Edmonton
    There's also an adjustment for head refresh rate you should check. It determines how often the head returns to the capping station to refresh the ink in the dampers. Your long run may have depleted the available ink from the dampers until you did the cleaning.
     
  4. mustafade

    mustafade Member

    202
    0
    0
    Aug 13, 2010
    Good tip! I'll check on that. Any idea what it supposed to be vs what it should be?
    I talked to a technician he said that if it is stop firing during printing it can't be the capping station, he said that I should check the o ring on the mount brackets for dampers because there might be air leak because it can't contentiously draw ink during the printing.
     
  5. Rooster

    Rooster Very Active Member

    1,209
    2
    38
    Feb 22, 2008
    Edmonton
    I'm not sure what it should be set at, or even what printer you have. My JV33 is set the same as it was when it was delivered and I haven't had any problems. Your dealer should be able to walk you through changing it over the phone. If it was working correctly before, then changing the head refresh rate will probably just be masking the underlying problem.

    Checking the dampers is always the first thing to check when you're dealing with ink delivery issues during printing. If the ink disappears after sitting for awhile then it's usually the capping station. Although an improper seal at the capping station can also cause the head refresh to work incorrectly as the pump won't be able to draw ink through the head to refresh the dampers if the seal at the capping station isn't correct.
     
  6. Neil

    Neil Member

    337
    11
    18
    Aug 25, 2005
    Adelaide, South Australia
    It'd be something above the head, not below it.
    Sounds like partially clogged dampers or something restricting the flow - causing ink starvation on a long run.

    Being that 1 normal cleaning brought them back, the cap seal seems good.
    As Rooster said: check the dampers.
     
  7. lmmnsr

    lmmnsr New Member

    13
    1
    3
    Mar 17, 2011
    aruba
    What is the correct printhead height....MIamaki CJV30?

    Hi again everyone, I replaced my printing head on my Mimaki CJV30-160 and I was hoping someone can tell me what is the correct height measurement without any media mounted?
     
  8. mustafade

    mustafade Member

    202
    0
    0
    Aug 13, 2010
    Checking the dampers is one of the first things I did.
    It seemed they were low, low being little more than half full in the dampers.
    Problem is still there, I haven't resolved it yet. Next thing I am gonna try is to check the refresh rate.
     
  9. mustafade

    mustafade Member

    202
    0
    0
    Aug 13, 2010
    Hello everyone,

    Although the thread title says Cyan and Black but any given color and channel is having the same issue.

    I am still having the same problem. However, I noticed now it takes more than one time NORMAL Cleaning cycle to get the colors back.

    Do you think it is an capping station alignment?

    The reason I am leaning towards this way now more than ever is when the tech was done and gone fixing my problem which was exactly the same problem, 30 to 45 min later it did the exact same problem and I called the tech on his cell phone and he had me adjust the capping station over the phone.

    Any inputs?

    I am kind a desperate to get this fixed on my own now.
     
  10. SightLine

    SightLine Very Active Member

    Cannot remember for sure but I seem to recall your machine is a JV33 correct? If so there should not be ANY air in the dampers. Totally opposite of the JV3 which typically has dampers half full. Main thing I would check beyond that is the head refresh rate. In Flexi you can set the head refresh rate job - on jobs with very heavy ink coverage I do generally bump the refresh up to two to make sure it does not starve for ink. On Flexi on the driver tab when sending a job - you can set the refresh from 0 (no refresh during the job) to 3. Typically we leave it on 1 all the time but on the heavy coverage jobs often bump it to 2. I've never used it on 3. I imagine you can set this on the control panel as well.
     
  11. mustafade

    mustafade Member

    202
    0
    0
    Aug 13, 2010
    Yes it is a JV33. There is always air in the dampers. I attached a picture how they pretty much look.
    Yes I can set it as well. Some of my profile settings were at 0, so I bumped all of them to 3 for now.
    Strange thing is thou when stop firing in the middle of a print job the ink level in the dampers are still the same as in the picture I attached.
     

    Attached Files:

  12. mustafade

    mustafade Member

    202
    0
    0
    Aug 13, 2010
    I changed the capping station about a month ago.
     
  13. SightLine

    SightLine Very Active Member

    My guess is you are having a pressure issue in the ink system due to the air in the dampers. On these machines (JV5 as well) the dampers shoudl not have ANY air at all in them. If there is there will be pressure issues when printing at high speeds or high ink coverage. It will probably work when slowed down and set the refresh high but it's going to be an ongoing problem. These are very sensitive the the pressure in the lines. I will also say from experience- getting the air out of the dampers is a major pain in the rear. I pretty much filled a big glass dish with washing liquid and using a syringe and tube dunked them - while holding the side valve on the damper open to get mine totally filled with no air when I changed the dampers on mine several months back.
     
  14. mustafade

    mustafade Member

    202
    0
    0
    Aug 13, 2010
    I talked to a Advantage Sign Supply tech yesterday he thinks that it is an electrical problem and he thinks that the other tech who worked on my printer misdiagnose the problem.
    He thinks that the trailing cable is needs to be changed but I am not convinced.
    I sent him the same picture I post it here, he says that much air in the damper isn't uncommon and he says it is a total considend that when you do a cleaning during mid printing colors are coming back.
    Go figure!
     
Loading...

Share This Page

 


Loading...