actually it is the horizontal lines that are missing, I was just trying to be clear with the picture
here is a more accurate pic of the yellow test pattern (vertical lines omitted for clarity)
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I have been printing out a flyer, and on my last run, I noticed that there was some banding going on. I did a nozzle check, and if you look at the yellow portion, on the bottom half of the test rectangle, every other column is not printing. It looks something like this:
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