SM 74 2+2 Error 3 group

Hello, I have a problem with my 1994 sm74. The machine stops under pressure and group 3 error appears. I have also replaced the micron that works on the pulley, but I see the pulley moving in a strange way.

 

hello dear sir, when the machine is printing and it stops. check the message on the screen or see while the machine is printing is that the roller adjustment screw is not touching not the red bars between the cylinders. thank you and good luck

 

Hello, message 3 appears on the display. I checked it is not the bars, it looks like the phase micron where the belt is

 

hello sir could you show us that the screen of the machine concerning the error is displayed with a photo and please show the image well so that we can see it well thank you

Cordially
Mr. Adou

 

Take a video of the problem too if you can take a picture of the dyn test