Xerox 4127 cp error 077-313

[mkdirs]

hello all
have problem with Xerox 4127 c/p with error 077-313
its a multi feed check Sensor Failure
I locate the multi feed check Sensor Failure PWB and I adjust the VR1 Potentiometer to 220 Value

but I have the same Problem when I start a copy job the paper jam in the registration unit and I get the code again

And if anyone have software for this machine my controller + ps rom V 1.211.1
thanks

[mkdirs]

[Solved] thanks all