HP Latex 260 Maintenance and troubleshooting guide - Page 63

Vertical banding, The print is deformed into a curved shape

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As you modify the setting, the new setting is applied immediately to the current job by the printer. When you press OK to save the value, it is saved in the printer to be used throughout the current job. Vertical banding There are several different kinds of vertical banding that may be seen. ● Wide vertical bands visible by darkness or graininess, typically seen on vinyl and banner substrates in medium-density area fills such as grays, violets and greens ◦ Align the printheads. See Align the printheads on page 11. ◦ Try the automatic correction for vertical banding provided by the RIP. Depending on your firmware version, this option may also be provided by the front panel: select the icon, then select Image quality maintenance > Enable vertical correct. (if this option is available). NOTE: Remember to disable the vertical banding correction when you no longer need it, because it may increase grain. ● Thin vertical bands visible by darkness, typically seen in the first 150-200 mm of the print on vinyl and banner glossy substrates in high-density area fills or in backlit applications ◦ Reduce the ink quantity if possible. ◦ Disable the cutter. ◦ Increase the number of passes. ◦ If applicable, tell the RIP to group jobs together, so that printer temperatures remain more stable between jobs. ◦ Modify your media preset as suggested in Color reproduction tricks on page 52. ● Irregular or isolated vertical bands ◦ Increase the vacuum level in steps of 10 mmH2O. Do not exceed the following limits: 20 mmH2O for banners, 35 mmH2O for vinyl, and 50 mmH2O for other substrate families. ◦ In backlit applications, increase the number of passes to 20 or more, and change the drying temperature up and down in steps of 5°C. ◦ 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. 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 67. ENWW Vertical banding 57

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As you modify the setting, the new setting is applied immediately to the current job by the printer. When you
press
OK
to save the value, it is saved in the printer to be used throughout the current job.
Vertical banding
There are several different kinds of vertical banding that may be seen.
●
Wide vertical bands visible by darkness or graininess, typically seen on vinyl and banner substrates in
medium-density area fills such as grays, violets and greens
◦
Align the printheads. See
Align the printheads
on page
11
.
◦
Try the automatic correction for vertical banding provided by the RIP. Depending on your firmware
version, this option may also be provided by the front panel: select the
icon, then select
Image
quality maintenance
>
Enable vertical correct.
(if this option is available).
NOTE:
Remember to disable the vertical banding correction when you no longer need it, because
it may increase grain.
●
Thin vertical bands visible by darkness, typically seen in the first 150
–
200 mm of the print on vinyl and
banner glossy substrates in high-density area fills or in backlit applications
◦
Reduce the ink quantity if possible.
◦
Disable the cutter.
◦
Increase the number of passes.
◦
If applicable, tell the RIP to group jobs together, so that printer temperatures remain more stable
between jobs.
◦
Modify your media preset as suggested in
Color reproduction tricks
on page
52
.
●
Irregular or isolated vertical bands
◦
Increase the vacuum level in steps of 10 mmH
2
O. Do not exceed the following limits: 20 mmH
2
O
for banners, 35 mmH
2
O for vinyl, and 50 mmH
2
O for other substrate families.
◦
In backlit applications, increase the number of passes to 20 or more, and change the drying
temperature up and down in steps of 5
°
C.
◦
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.
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
67
.
ENWW
Vertical banding
57