Finally, a special pattern for checking the printer’s printhead alignment can be found at the top left of the
diagnostic sheet. This pattern has no number as it is not used for scanner checking. It is made of three colored
crosses that may be used to identify the problem in question. The correct pattern is shown on the left, an
example of misalignment on the right.
Loss of shadow or highlight details
Looking at pattern H, you may nd a problem with the color calibration of the printer (CLC process). If you can
distinguish lightness steps beyond the upper and lower specied thresholds, then the printer is ne. Here you
can see examples of correct functioning on the left, incorrect on the right.
If the printer does not pass this test, you should run a color calibration if the paper loaded in the printer can
be calibrated (coated or glossy paper, for instance). The color calibration can be launched from the front panel
by touching , then Image Quality Maintenance > Color calibration.
Printer banding
Looking at patterns A, B, and C, you can see vertical banding problems. See Horizontal lines across the image
(banding) on page 139.
170 Chapter 2 Troubleshooting ENWW
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