HP Latex 560 User Guide - Page 125

Print is deformed into a curved shape, Graininess level may increase with

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● Regular vertical bands matching the shape of the platen may be seen on paper-based substrates and in general on thin substrates in medium-density area fills such as grays or violets. Try the following suggestions to mitigate this problem: - Align the printheads. See Align the printheads on page 146. - Reduce the vacuum level in steps of 5 mmH2O when printing on vinyl. Do not exceed the lower limit of 10 mmH2O for vinyls or 25 mmH2O for papers to avoid crashes and/or smears. Consider using the substrate edge holders to avoid lateral crashes. See Edge holders on page 68. - Consider using the take-up reel, for better control of the substrate. - This kind of banding is less visible when the printer is stable at high temperature (after more than half an hour of continuous printing). You can help to avoid visible banding by modifying the printing queue so that vulnerable or important prints are printed later; or by pre-warming the printer by using the option available in your RIP. ● Thin vertical dark bands, typically seen in the first 150-200 mm of the print in high-density area fills or in backlit applications - Reduce the ink quantity if possible. - Disable the cutter. - When using backlit and synthetic substrates, decrease the vacuum level to values around 5-15, depending on the substrate thickness. More vacuum is normally applied to thick substrates and less to thin substrates. - Increase the number of passes. - If applicable, use the RIP to group jobs together, so that printer temperatures remain more stable between jobs. ● Thick vertical band not coinciding with the shape of the platen; can be seen on vinyl or backlit substrates with dense area fills such as green or orange - Press , then Image quality maintenance > Printzone airflow, and change the option from High (default) to Low. Graininess level may increase with the Low option, so you are recommended to revert to High when finishing the job. ● Irregular or isolated vertical bands with abnormal levels of graininess - Increase the vacuum level in steps of 5 mmH2O. Do not exceed the following limits: 20 mmH2O for banners 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, disable the cutter and advance the substrate manually about 100-150 mm before the first print. - If the banding appears in the center of the print, check that the platen sticker joining the removable print zones is present. You can find spare stickers in the printer maintenance kit. Print is deformed into a curved shape This may occur as a result of substrate bow deformation. See Substrate has bow deformation on page 88. ENWW Most-common print-quality problems 119

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●
Regular vertical bands matching the shape of the platen may be seen on paper-based substrates and in
general on thin substrates in medium-density area fills such as grays or violets. Try the following
suggestions to mitigate this problem:
–
Align the printheads. See
Align the printheads
on page
146
.
–
Reduce the vacuum level in steps of 5 mmH
2
O when printing on vinyl. Do not exceed the lower limit of
10 mmH
2
O for vinyls or 25 mmH
2
O for papers to avoid crashes and/or smears. Consider using the
substrate edge holders to avoid lateral crashes. See
Edge holders
on page
68
.
–
Consider using the take-up reel, for better control of the substrate.
–
This kind of banding is less visible when the printer is stable at high temperature (after more than half
an hour of continuous printing). You can help to avoid visible banding by modifying the printing queue
so that vulnerable or important prints are printed later; or by pre-warming the printer by using the
option available in your RIP.
●
Thin vertical dark bands, typically seen in the first 150–200 mm of the print in high-density area fills or in
backlit applications
–
Reduce the ink quantity if possible.
–
Disable the cutter.
–
When using backlit and synthetic substrates, decrease the vacuum level to values around 5–15,
depending on the substrate thickness. More vacuum is normally applied to thick substrates and less
to thin substrates.
–
Increase the number of passes.
–
If applicable, use the RIP to group jobs together, so that printer temperatures remain more stable
between jobs.
●
Thick vertical band not coinciding with the shape of the platen; can be seen on vinyl or backlit substrates
with dense area fills such as green or orange
–
Press
, then
Image quality maintenance
>
Printzone airflow
, and change the option from
High
(default) to
Low
. Graininess level may increase with the
Low
option, so you are recommended to
revert to
High
when finishing the job.
●
Irregular or isolated vertical bands with abnormal levels of graininess
–
Increase the vacuum level in steps of 5 mmH
2
O. Do not exceed the following limits: 20 mmH
2
O for
banners 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, disable the cutter and advance the substrate
manually about 100–150 mm before the first print.
–
If the banding appears in the center of the print, check that the platen sticker joining the removable
print zones is present. You can find spare stickers in the printer maintenance kit.
Print is deformed into a curved shape
This may occur as a result of substrate bow deformation. See
Substrate has bow deformation
on page
88
.
ENWW
Most-common print-quality problems
119