Need Help Inconsistent print

[printpal998]

Hi everyone. I am new in digital printing. I have a Roland sp540v printer and when i print on frontlit banner I get these lines (see photo). The printheads are new, installed a few months ago. This problem happens only with frontlit banner, on other media is fine.
Thanks.

 

[cornholio]

It works on other media... it works

 

[printpal998]

Thank you for your answer.

What is then the reason for these lines with inconsistent ink?

 

[BigNate]

you really don't give too much to work from --- it looks like you may simply have an interference pattern from the spray pattern and the grid/weave of the media.