Thanks all. I found it
The separation roller shaft wasn't secured in it right place
also PS21 spring wasn't over the sensor arm.
Now it works good. and copied 20 repeteive papers.
thanks again.
**Knowledge is time consuming, exhausting and costly for a trained Tech.**
Practice makes perfect
If it ain't broke, don't fix it
A picture is worth a thousand words
If you want something done right, you have to do it yourself
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