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capping station replaced, poor k printing

Discussion in 'Mutoh' started by AUTO-FX, Oct 25, 2010.

  1. AUTO-FX

    AUTO-FX Very Active Member

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    Feb 14, 2010
    Anyone got a clue here - I replaced the pump and capping station. the pump hose routings were just a very little bit different coming out of the pump- but basically the same. 2 shorts, 2 longs.
    Color head prints fine, black head prints inconsistent and problematic. couple clean cycles makes it better ( but not great) then right back to poor on the next nozzle check. black ink spits all around maintenance station.
     

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  2. CS-SignSupply

    CS-SignSupply Very Active Member

    When doing a clean on the unit, check to make sure you have ink exiting the pump to the drain bottle. This will assure that you are getting suction from the pump.

    How long were the printheads uncapped?

    You might also try to change the damper on the black head. Usually if a head continues to have priming issues, it is either the damper or the unsuccessful seal of the cap station to the head.
     
  3. AUTO-FX

    AUTO-FX Very Active Member

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    Feb 14, 2010
    thanks bobby -
    Heads were uncapped for an hour or so.
    Yes, good ink flow to tank during clean cycle.
    Intially after replacement, the black cap would not spring into position correctly. This fixed itself with a dozen or so cycles as it "broke in." I manually moved the head back and forth into position ( power off! ) until it worked right. Atleast it appears right.
    BUT, it may BE poor seal, since i can get a decent nozzle check after cleaning and then it falls off.
    what do i do?

    wow, crazy, it goes from a good nozzle check to printing next to no K after sitting parked for 3 minutes.
     
  4. CS-SignSupply

    CS-SignSupply Very Active Member

    I would suspect Damper in this case... Sounds almost like the reservoir in the head is not being replenished by the damper. How old are the dampers?

    Running a clean and then a test print - ok
    Sit for 3 minutes, test print, no K - air getting to the head or bad damper possibly
     
  5. AUTO-FX

    AUTO-FX Very Active Member

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    Feb 14, 2010
    OK, i'll swap out the damper just to rule it out. Dont you find the ink spitting to be alarming? I never had that previously.
     
  6. CS-SignSupply

    CS-SignSupply Very Active Member

    Alarming? possible. Spitting could be caused by a slightly clogged nozzle firing at an angle... That is not a big deal.

    This statement, "the black cap would not spring into position correctly. This fixed itself with a dozen or so cycles as it "broke in."", does concern me...

    If the cap was misaligned, it is possible that the head could have been compromised during the 10-12 cycles you mention. If the plastic of the cap was forced onto the firing plate of the head, it might have damaged it.
     
  7. AUTO-FX

    AUTO-FX Very Active Member

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    Feb 14, 2010
    no, no damage to head. swapped out damper, suctioned ink, ran cleaning cycle and printed two nice nozzle checks. i will let it sit awhile now and see what happens. Also, i must have knocked out the head alignment, black box in nozzle check is now slightly askew. Need to address that next.
     

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  8. artbot

    artbot Very Active Member

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    Feb 18, 2010
    Houston TX
    sounds like you might have it.

    when you installed the pump, did you rotate the pump to a closed idle position?
     
  9. AUTO-FX

    AUTO-FX Very Active Member

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    Feb 14, 2010
    Pump rotation? Heck, i dont know. i'm lucky i got the damn thing in there to begin with LOL!
    After sitting all afternoon, it still prints a nice nozzle check.
    All's well that ends well i guess.
     
  10. CS-SignSupply

    CS-SignSupply Very Active Member

    Good to hear all is good.
     
  11. SlightlyChilled

    SlightlyChilled Very Active Member

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    Dec 19, 2009
    Hell
    Are you back up on all 4 colors you should have called me
     
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