HP Latex 360 Users Guide - Page 118

Horizontal banding, have light bands, decrease it. When you find the right adjustment

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● The substrate-advance sensor may be dirty. This can happen when printing on porous substrates with the 360 or 370 printer, even when using the ink collector (see Clean the substrate-advance sensor window (360 and 370 only) on page 148). ● If you are printing with eight or more passes, the substrate advance may need fine adjustment (360 or 370 printer) or proper calibration (310 or 330 printer). See 4. The substrate-advance check plot on page 110. ● Use a higher number of passes: you will probably see less grain with ten or more passes. ● If graininess is more visible in light area fills, with the appearance of coalescence graininess (see 2. The optimizer check plot on page 106), try the following solutions: ◦ Go to your substrate library on the front panel or in your RIP. Select your print mode and increase the amount of optimizer in the the advanced settings. See Add a new substrate on page 92. ◦ Clean the optimizer printhead. ◦ Print in Economode (four colours). NOTE: A small change in overall graininess (but not coalescence) may be perceived in some areas because the light-colored inks, which are not used in Economode, help to provide smooth transitions. Horizontal banding Try the following remedies if your printed image suffers from added horizontal lines as shown (the color may vary). ● If you are using a print mode with six or fewer passes, try increasing the number of passes. Some degree of banding can be expected with few passes. ● 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 while printing on page 111). 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 front panel for future prints on the same substrate. Another cause could be a fiber attached to one of the printheads. Turn off the printer, 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 1. The printhead status plot on page 106). If necessary, clean the printheads (see Clean (recover) the printheads on page 126). ◦ Sometimes a single cleaning action may not completely clean every nozzle. Print the status plot and consider cleaning again. 112 Chapter 5 Troubleshoot print-quality issues ENWW

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●
The substrate-advance sensor may be dirty. This can happen when printing on porous substrates with
the 360 or 370 printer, even when using the ink collector (see
Clean the substrate-advance sensor
window (360 and 370 only)
on page
148
).
●
If you are printing with eight or more passes, the substrate advance may need fine adjustment (360 or
370 printer) or proper calibration (310 or 330 printer). See
4. The substrate-advance check plot
on page
110
.
●
Use a higher number of passes: you will probably see less grain with ten or more passes.
●
If graininess is more visible in light area fills, with the appearance of coalescence graininess (see
2. The
optimizer check plot
on page
106
), try the following solutions:
◦
Go to your substrate library on the front panel or in your RIP. Select your print mode and increase
the amount of optimizer in the the advanced settings. See
Add a new substrate
on page
92
.
◦
Clean the optimizer printhead.
◦
Print in Economode (four colours).
NOTE:
A small change in overall graininess (but not coalescence) may be perceived in some
areas because the light-colored inks, which are not used in Economode, help to provide smooth
transitions.
Horizontal banding
Try the following remedies if your printed image suffers from added horizontal lines as shown (the color may
vary).
●
If you are using a print mode with six or fewer passes, try increasing the number of passes. Some
degree of banding can be expected with few passes.
●
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 while printing
on page
111
). 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 front panel for
future prints on the same substrate.
Another cause could be a fiber attached to one of the printheads. Turn off the printer, 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
1. The printhead status plot
on page
106
). If necessary, clean
the printheads (see
Clean (recover) the printheads
on page
126
).
◦
Sometimes a single cleaning action may not completely clean every nozzle. Print the status plot
and consider cleaning again.
112
Chapter 5
Troubleshoot print-quality issues
ENWW