HP Designjet 4520 Printer series - Manual (Page 137)

In the color gradient, part A, you should look for light or dark horizontal bands (banding), which indicate
that the paper advance is not quite right. Usually you will see dark bands across the first pattern and
light bands across the last pattern (see the examples below). The best pattern is one with no banding;
if in doubt, select the pattern in the middle, between the last pattern with dark bands and the first pattern
with light bands.
If you find it difficult to identify the best pattern, the following scenario descriptions may help you.
● Where you have only one pattern which is clearly the best and the ones above and below contain
light/dark bands, select this pattern.
ENWW The calibration process in detail 127
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