Avantra 30 E imaging problem

Hello everybody,
Please I need help:I have the problem on avantra 30 E imagesetter.
When I do internal test page or I try to image from the RIP there are some
lines in the image in fast scan direction.
see the attachment :Test film avantra30E copie.jpg
I tried to clean the spinner encoder,I did the carriage alignment
with Avdiag but no change.

Thanks in advance.

Attached Images

• Test film avantra30E copie.jpg (646.9 KB)