HP Designjet L26500 HP Designjet L26500 printer series - Maintenance and troub - Page 62

Horizontal banding, Troubleshoot images

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Troubleshoot images If you see this kind of problem: ● Ensure that the vertical correction option is disabled in the RIP and in the front panel. At the front panel, select the icon, then select Image quality maintenance > Disable vertical correct. (if this option is available). ● 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 9). You can check whether it is necessary by using the printhead status plot (see Use the printhead status plot on page 54). ● If you are printing with eight or more passes, the substrate advance may need adjustment. See Adjust the substrate advance on page 57. ● Use a higher number of passes: you will probably see less grain with ten or more passes. ● If graininess is more visible in dark or saturated colors, there may be a problem of ink coalescence. Try lowering the ink quantity. If the problem persists, call your service representative. See When you need help on page 86. Horizontal banding Try the following remedies if your printed image suffers from added horizontal lines as shown (the color may vary). ● If bands affect mostly dark or saturated colors, or only area fills near the edges of the substrate, the cause could be insufficient drying of the ink, or an inaccurate color profile. Try the following suggestions. ◦ Reduce the ink quantity. ◦ Increase the number of passes. ◦ Modify your media preset as suggested in Color reproduction tricks on page 53. ● If bands affect all colors across the width of the printed image, the cause is probably a substrate advance problem. Use the front panel to adjust the substrate advance on the fly (see Substrate advance adjustment on the fly on page 58). If you have dark bands, increase the substrate advance; if you have light bands, decrease it. When you find the right adjustment, store the value in the RIP for future prints on the same substrate. Another cause could be a fiber attached to one of the printheads. Turn off the printer and allow it to cool down, then remove the printheads one at a time and remove any fibers that you see attached to them. 56 Chapter 6 Troubleshoot print-quality issues ENWW

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If you see this kind of problem:
●
Ensure that the vertical correction option is disabled in the RIP and in the front panel. At the front
panel, select the
icon, then select
Image quality maintenance
>
Disable vertical
correct.
(if this option is available).
●
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
9
). You can check whether it is necessary by using the printhead status plot
(see
Use the printhead status plot
on page
54
).
●
If you are printing with eight or more passes, the substrate advance may need adjustment. See
Adjust the substrate advance
on page
57
.
●
Use a higher number of passes: you will probably see less grain with ten or more passes.
●
If graininess is more visible in dark or saturated colors, there may be a problem of ink
coalescence. Try lowering the ink quantity.
If the problem persists, call your service representative. See
When you need help
on page
86
.
Horizontal banding
Try the following remedies if your printed image suffers from added horizontal lines as shown (the color
may vary).
●
If bands affect mostly dark or saturated colors, or only area fills near the edges of the substrate,
the cause could be insufficient drying of the ink, or an inaccurate color profile. Try the following
suggestions.
◦
Reduce the ink quantity.
◦
Increase the number of passes.
◦
Modify your media preset as suggested in
Color reproduction tricks
on page
53
.
●
If bands affect all colors across the width of the printed image, the cause is probably a substrate
advance problem. Use the front panel to adjust the substrate advance on the fly (see
Substrate
advance adjustment on the fly
on page
58
). If you have dark bands, increase the substrate
advance; if you have light bands, decrease it. When you find the right adjustment, store the value
in the RIP for future prints on the same substrate.
Another cause could be a fiber attached to one of the printheads. Turn off the printer and allow it
to cool down, then remove the printheads one at a time and remove any fibers that you see
attached to them.
56
Chapter 6
Troubleshoot print-quality issues
ENWW
Troubleshoot images