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Print Quality
6-9
HP DesignJet 430, 450C and 455CA Printers
VLS Problem: If the line is not perfectly straight at Bias 0 in the
test image (see Figure 4).
Corrective Action: Try the following steps:
1 Perform the Cartridge Alignment Calibration
(Details ' Users Guide) using genuine HP
media then print the PrintĆQuality Plot again
to see if there has been any improvement.
2 If the problem continues perform the Accuracy
Calibration (Details ' page 5Ć2) and print the
PrintĆQuality Plot again to see if there has been
any improvement.
3 If the error is still present, replace the failing
cartridge and print the PrintĆQuality Plot again.
4 If the error continues try the following:
D Replace the Trailing Cable ' page 8Ć8.
D Replace the Carriage Assembly ' page 8Ć37.
D Replace the Electronics Module ' page 8Ć13.
Only replace one component at a time and
check if the problem has gone before
replacing another component. Using this
procedure you will be able to determine
exactly which component failed.
Test Pattern 4: Color Alignment Quality Test
Upper T est: The first of these patterns tests alignment between the cyan and
magenta cartridges; it should be blue with no cyan or magenta shadows. The
second tests alignment between the cyan and yellow cartridges; it should be green
with no cyan or yellow shadows. The third tests alignment between the magenta
and yellow cartridges; it should be red, with no magenta or yellow shadows.
Lower Test: This test pattern is to check the color alignment, and produces
6 patterns each with 2 different primary colors. In each pattern you will see
primary color circles. If there is misalignment between the primary colors the
composite color will be present in one part of the circle and white will be
visible at the opposite side of the circle.
There are two types of misalignment (see Figures 5 and 6):
D Horizontal Ć when the misalignment is in the horizontal axis.
D Vertical Ć when the misalignment is in the vertical axis.