HP Designjet T3500 Production eMFP - Manual (Page 244)

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 16, you may find a problem with the color calibration of the printer (CLC process). If you
can distinguish lightness steps beyond the upper and lower specified thresholds, then the printer is fine. 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 pressing , then Image-quality maintenance > Calibrate color.
Printer banding
Looking at patterns 1, 2, and 3, you can see vertical banding problems due to a miscalibrated paper advance
in the printer.
234 Chapter 23 The scanner diagnostic plot ENWW