after reading this topic, found a solution to my problem with estudio 2820c, almost the same copier like 2500c, 3510, and many others
it was true something was bent, but not the chassis, or the door frame it was something else
IN MY CASE, THE PAPER WAS CLINGING TO THE SECOND TRANSFER ROLLER, IT WAS GOING AROUND THE ROLLER. SENSOR WAS WORKING FINE.
the issue was the bolts where the door latches onto the machine , 1 was bent inward, an it created an uneven pressure between transfer belt and transfer roller
just straighten them and all good
i will add 2 photos with them
thanks to Austech for suggestions
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