% dot screen on Heidelberg SM-72V - CPC

Hi all...

I have been working on a Heidelberg SM-72V cpc machine...I continue facing problem of % dot screen not transferred to substrate ...specially for dot % between 25% to 80%..on printing the dots illustration become solid.

what will be the possible reasons, is it happen due to excess dot gain only..???

What is the reason for the same from machine end...???

Please help...!!!!!


Thanks in advance for your support.