My prints appear to be grainy, how can this be fixed?

Posted in Sign & Display media for HP Latex printers by HP User Fri May 15 2015 16:41:18 GMT+0000 (Coordinated Universal Time)·1·Viewed 8,418 times

May 21, 2015

Try the following remedies if your prints appear grainy:

Ensure that the vertical correction option is disabled in the RIP and in the front panel. At the front panel, press the gear icon , then Image-quality maintenance > Vertical correction (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 in your HP Latex User Guide). You can check whether it is necessary by using the printhead alignment status plot.

The substrate-advance sensor may be dirty. This can happen when printing on porous substrates with the Latex 360 or 370 printer, even when using the ink collector (see Clean the substrate-advance sensor window (Latex 360 and 370 only) in your HP Latex User Guide).

If you are printing with eight or more passes, the substrate advance may need fine adjustment (Latex 360 and 370 printer) or proper calibration (Latex 310 or 330 printer). See The substrate-advance check plot in your HP Latex User Guide.

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 The optimizer check plot in your HP Latex User Guide ), 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 advanced settings.
  • Clean the optimizer printhead.
  • Print in Economode (four colors).

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