Roland 305 communication failure

Hello;

We have a Man Roland 305 Offset machine. While the machine is working or waiting during the day, the system suddenly cuts off and we have to turn the machine on and off. It is not clear when this error will occur. sometimes once a day. sometimes 5 times a day. The errors it gives during this event are different each time. I have indicated a screen with a picture. Special request, I would appreciate if you show the location of the master and slave card and where the leitstand machine is with a picture. please your support.

 

You have fiber optic problems or one of the communication controllers. Errors from the center console are from lack of communication.

 

change, the security card of the EA

 

Where exactly are these cards located?

 

+EA is delivery unit