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JV33 Not printing magenta on one complete channel

Discussion in 'Mimaki' started by Jason_Elliott, Aug 10, 2011.

  1. Jason_Elliott

    Jason_Elliott Member

    Jul 21, 2011
    Will run fine after a clean. Then about in the same place on this mainly red job it will start to drop out. I immediatley cancel the print and run a nozzle check and one complete channel was gone. The other channel prints and looks great.

    So I changed all the dampers, all the joint valves and o-rings going into the joint valve assembly on the ink lines.

    printed great for a couple of weeks no problem until today started doing the same exact thing again. Now, I wanted to change the capping assembly but Mimaki was on backorder so I was forced to wait. So today I was checking to make sure there was no air leaks or anyway for air to be introduced into the lines at the dummy cartriges of the bulk ink system.
    When I pulled the cover off I noticed there were two lines for each color but right below where it comes out of the dummy cart there is a cross bar that feeds ink to either side. I can only assume this is to help balance the resovoir for the bulk ink. I checked all the o-rings and couplers and everything is tight.

    I put in two cleaning carts in the magenta slots and manually pulled ink through using the ink lines right above the damper on the magenta only. I cleared all the solvent cleaning solution out and filled the system and run the same print again no problem, so I tried again and no problem.

    There is no distinct problem showing up here and I am stumped, because I just know tomorrow it is going to do it again. I just want to know if I pulled that little crossmember out and just run a single ink line per dummy cart if that problem could possibly be resolved.

    I am all ears here, so chime in with your thoughts.
  2. Robert M

    Robert M Very Active Member

    Jan 23, 2007
    cap top

    I vote for a new cap top, megenta is on the outside channel of that head so a bad cap will be noticed there first.
    i have then in stock

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