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Question SP300(V) Printing Issues - Cyan Ink Starvation / Black Overspray

Discussion in 'Roland' started by DanK, Feb 19, 2019.

  1. DanK

    DanK New Member

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    Jan 13, 2018
    Buffalo
    My SP300 started acting up lately. While printing 4" CMYK test squares, I noticed that the cyan square had light coverage and minor overspray and the black square had overspray. I shook each ink cartridge and discovered that the cyan was empty. After replacing the cyan ink cartridge (OEM inks used for life of the printer), I performed a manual clean of the heads, wipers, and cap tops. I decided to replace the cyan/black cap top and primed it with cleaning solution. After running a medium clean, I reprinted the 4" CMYK test squares, but there was no change from the originals. Wondering if there was air in the system, I ran a powerful clean. Then I printed a full 8" strip of cyan at standard quality, but again no change from original (print was consistent across all 8"). I then printed a full 4" strip of black, but no change from original (it almost seems like there is cyan overspray). Finally I printed a full 8" strip of cyan, but this time at high quality and the coverage got worse. My next thought would be dampers, but with the horror stories I've heard about damper replacement I just wanted to get some other opinions first. Just to note, magenta and yellow are printing great.

    Thanks in advance!
     

    Attached Files:

  2. Easiest way to check for overspray (IMHO) is to go into Service Mode and do a "Fill pattern".......Looking at your nozzle check and it's possible that the K overspray is coming from the "Deflection" in the K channel. Do you know the shot count on the K/C head? A new head would cure both C and K overspray.

    My .02
     
  3. klingsdesigns

    klingsdesigns Very Active Member

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    Apr 16, 2012
    Wisconsin
    What is the humidity at in your shop? I have had static issues that cause that. But also a black head can cause overspray as well. Not sure on the cyan. Almost looks as if your calibration is a little off as well.
     
  4. DanK

    DanK New Member

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    Jan 13, 2018
    Buffalo
    Static has been a bit of a concern with the weather in western NY; humidity is at around 30%. But there is definitely something else up with the cyan (see the attached service mode "Fill Pattern.jpg"). Cyan is showing signs of ink starvation, which is especially apparent when printed at standard and high quality (see attached "CYAN_High Quality vs Standard vs High Speed.jpg") - left square was printed at high quality, the middle at standard quality, and the right at high speed. The high speed print has the least amount of overspray and best coverage.

    Even with the misses in the standard black test print (see original post), the service mode black fill pattern is reasonable, with little overspray and the expected hue. That being said, when I then print the 4" black squares I'm getting significantly different results, with different hues, between high quality, standard quality, and high speed (see attached "BLACK_High Quality vs Standard vs High Speed.jpg") - the top square was printed at high quality, the middle at standard quality, and the bottom at high speed.

    I have noticed that the printer is stopping multiple times during each job to fill the dampers or at least that's what I think it's doing (the display continues to read "Now Processing"). I ran a visual check on the dampers and nothing looks out of the ordinary; the black and cyan dampers are just as full as the magenta and yellow dampers, no visible leaking. Just to note, I had run two powerful cleans prior to this most recent set of test prints thinking there may have been air in the line.

    Shot counts are as follows: Count 1 - 566113KShots, Count 2 -1194095KShots, Count 3 - 1934528KShots, Count 4 - 1451058KShots.
     

    Attached Files:

  5. autoexebat

    autoexebat Active Member

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    Apr 15, 2010
    USA
    I had the same issue , 98% of the people said static / humidity etc .. It was the head ! Cyan is usually the first to go .
     
  6. DanK

    DanK New Member

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    Jan 13, 2018
    Buffalo
    Why wouldn't the issue show up in the test print then?
     
  7. The test print/nozzle check only uses a quick pulse of the electronics, vs a print job that needs/uses a constant pulse.

    just my .02
     
  8. Sign Works

    Sign Works Very Active Member

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    Nov 25, 2006
    Sacramento, CA
    Experienced the same issue on my SP-300V, replaced the black/cyan print head with one from solventinkjet.com and it's printed beautifully ever since.
     
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