HP Latex 260 Maintenance and troubleshooting guide - Page 61

Horizontal banding - service manual

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● 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 85. 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 52. ● 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 56). 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. ● If bands affect only some colors, the cause could be a defective printhead. ◦ Print the printhead status plot (see Use the printhead status plot on page 53). If necessary, clean the printheads (see Clean (recover) the printheads on page 19). ◦ Clean the printheads again. ◦ Align the printheads (see Align the printheads on page 11). If necessary, align them manually. ◦ Print the printhead status plot again. Identify the printhead with the greatest number of blocked nozzles, and replace it. ◦ If bands appear and disappear intermittently, go to the front panel and select the icon, then Image quality maintenance > Enable extra PH cleaning. Remember to disable this option when you no longer need it, because it shortens the life of the printhead cleaning kit. ● If bands affect most of the colors, the printheads could 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 ENWW Horizontal banding 55

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●
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
85
.
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
52
.
●
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
56
). 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.
●
If bands affect only some colors, the cause could be a defective printhead.
◦
Print the printhead status plot (see
Use the printhead status plot
on page
53
). If necessary, clean
the printheads (see
Clean (recover) the printheads
on page
19
).
◦
Clean the printheads again.
◦
Align the printheads (see
Align the printheads
on page
11
). If necessary, align them manually.
◦
Print the printhead status plot again. Identify the printhead with the greatest number of blocked
nozzles, and replace it.
◦
If bands appear and disappear intermittently, go to the front panel and select the
icon, then
Image quality maintenance
>
Enable extra PH cleaning
. Remember to disable this option when
you no longer need it, because it shortens the life of the printhead cleaning kit.
●
If bands affect most of the colors, the printheads could 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
ENWW
Horizontal banding
55