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  1. HP Z6810 printing vertical lines every 1/4” any ideas?

    I am working on an HP Z6810 dye based printer. It is doing something I have not seen before. It was printing faint vertical lines using all colors (seen under magnification loupe) every 1/4” apart in all prints, including internal calibrations and test prints. It was running F/W version PX6_03...
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