Figure 3-50 Black print-quality troubleshooting page
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1. Grids The grids are in inches and millimeters. They are label with letters
and numbers so that defects can be described by position and by
distance between repeats.
2. Color plane registration (CPR) bars After printing, the box with no extra color in each area on each
page shows how far off the CPR of that color is. Each page has
two process direction areas and three scan direction areas that
are labeled x and y and 1–11. The page should be fed by the long
edge. Each square from the center equals 42 microns.
3. Color ramp patches Used to detect offset for the OPC or developer in the image drum
or offset in the fuser.
NOTE: To get further assistance in print quality troubleshooting, go to www.hp.com/support/colorljM750
and select PQ Troubleshooting Tools.
336 Chapter 3 Solve problems ENWW
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