HP PageWide XL 4500 User Guide - Page 154
Print diagnostic plot, Check and recover print bar
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Print diagnostic plot Tap the Print diagnostic plot button to identify the problems you may have. Use the same paper type that you were using when you detected a problem, and check that the selected paper type is the same as the paper loaded into the printer. The print is divided into three parts. The top part is about print-bar and color calibration problems, the center is about alignment problems, and the bottom part is an illustration of the printhead positions that can be used as a reference. Check and recover print bar If you detect problems in the top part of the plot, where there are random (not regular) lighter, very thin lines, some printheads may need cleaning. Tap Check and recover print bar. The time required depends on the number of printheads to be cleaned. Once they have been cleaned, reprint the diagnostic plot to check that the problem has been solved. Allow 10 minutes per printhead. If the problem persists, check in the diagnostic plot for which printhead the defects appear. You can identify which printhead has the problem from the numbered printhead image on the bottom of the top part. To clean only that printhead, tap Enhanced printhead recovery (see Enhanced printhead recovery on page 151). 148 Chapter 9 Print quality ENWW