Originally Posted by
winaki
Hello bumzag!
Thank you very much for the reply!
Unfortunately we do not have a description or a maintenance manual for our Fanuc 15-T (bought used, only a few documents were included.) I also came across the switch in descriptions from the Internet, but unfortunately this switch is not available on our Servo Drive. The AC voltage goes from the Fanuc power supply to the control PCB (A20B-1001-0620) via the two terminals above the power supply. There via transformer, rectification to the Hitachi Timing IC (similar to NE555) and then to the optocoupler to the NEC I / O IC. It would be interesting for us whether the power supply or the PCB is faulty and what the values should be. Probably not solvable without a description or circuit diagram ...
@drdos: I added the attachments again at the allowed size and hope they are available now.