HP DesignJet Z6 User Guide - Page 184
part 2; these are acceptable because the printer can compensate for a few clogged nozzles.
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Z9+ Image Diagnostics Print NOTE: If you use photographic paper, the matte black ink may come off when you touch the print. First look at the upper part of the print (part 1). Each colored rectangle should be a uniform color without any horizontal lines across it. Then look at the bottom part of the print (part 2). For each individual colored pattern, check that most of the dashes are present. If you see horizontal lines in part 1 and also missing dashes in part 2 for the same color, the printhead responsible needs cleaning. However, if the rectangles look solid, do not worry about just a few missing dashes in part 2; these are acceptable because the printer can compensate for a few clogged nozzles. Here is an example of a photo black printhead in a good state: And here is an example of the same printhead in a bad state: 176 Chapter 15 Troubleshooting print-quality issues ENWW
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