HP Latex 110 Users Guide - Page 99

The print is deformed into a curved shape, Misaligned colors, Color variation and text-line correction

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◦ Increase the vacuum level in steps of 5 mmH2O. Do not exceed the following limits: 20 mmH2O for banners, 45 mmH2O for vinyl, and 50 mmH2O for other substrate families. ◦ In backlit applications, increase the number of passes to 20, maintaining the vacuum level below 20 mmH2O. ◦ If the banding appears only at the beginning of the print, advance the substrate manually about 100-150 mm before the first print. The print is deformed into a curved shape This may occur as a result of substrate bow deformation. See The substrate has bow deformation on page 68. Misaligned colors If the colors are misaligned in any direction, the printheads may be misaligned. This is likely if you have not aligned the printheads for a long time, or if there has been a substrate jam. Align the printheads if necessary (see Align the printheads on page 106). You can check whether it is necessary by printing the printhead alignment status plot (see 3. The printhead alignment status plot on page 87). Color variation and text-line correction If some printhead nozzles are in use while others in the same printhead are not, water evaporates slowly from the ink in the unused nozzles, making the color more intense. Thus, in such cases you may notice variations in color intensity in areas where the color of the image should be constant. If you notice such a problem, there are various possible solutions. 1. If you notice the variation in intensity near one side of the print, try rotating the image by 180 degrees before printing. This may solve the problem in some cases, as all the nozzles are refreshed whenever they enter the service station between passes. ENWW Most-common print-quality problems 93

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◦
Increase the vacuum level in steps of 5 mmH
2
O. Do not exceed the following limits: 20 mmH
2
O for
banners, 45 mmH
2
O for vinyl, and 50 mmH
2
O for other substrate families.
◦
In backlit applications, increase the number of passes to 20, maintaining the vacuum level below
20 mmH
2
O.
◦
If the banding appears only at the beginning of the print, advance the substrate manually about
100–150 mm before the first print.
The print is deformed into a curved shape
This may occur as a result of substrate bow deformation. See
The substrate has bow deformation
on page
68
.
Misaligned colors
If the colors are misaligned in any direction, the printheads may be misaligned. This is likely if you have not
aligned the printheads for a long time, or if there has been a substrate jam. Align the printheads if necessary
(see
Align the printheads
on page
106
). You can check whether it is necessary by printing the printhead
alignment status plot (see
3. The printhead alignment status plot
on page
87
).
Color variation and text-line correction
If some printhead nozzles are in use while others in the same printhead are not, water evaporates slowly
from the ink in the unused nozzles, making the color more intense. Thus, in such cases you may notice
variations in color intensity in areas where the color of the image should be constant.
If you notice such a problem, there are various possible solutions.
1.
If you notice the variation in intensity near one side of the print, try rotating the image by 180 degrees
before printing. This may solve the problem in some cases, as all the nozzles are refreshed whenever
they enter the service station between passes.
ENWW
Most-common print-quality problems
93