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CTP laser problem

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Hi everyone!

I have a problem with SCREEN 8300s CTP. After exposing and developing on plates there are some strange patterns. That patterns appear only on magenta and yellow plates. I attached pictures of patterns.
At first I thought that something happened during RIP, but in RIP viewer I don't see anything.
I have two CTPs and I use Trueflow on both. On one there is this pattern and on the other there isn't. So it is a problem with CTP.
I use termal positive plates, laser power 2400dpi on 70%, 600rpm.
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