HP Latex 360 Printer - Manual (Page 118)

● If you are printing with eight or more passes, the substrate advance may need fine adjustment (360
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.
◦ Align the printheads (see Align the printheads on page 127 ). If necessary, align them manually.
◦ Print the printhead status plot again. Identify the printhead with the greatest number of blocked
nozzles, and replace it.
112 Chapter 5 Troubleshoot print-quality issues ENWW