I run a wood workshop. specializes in using CNC machines. The cnc machine is currently using yaskawa's sigma 7 servo. The problem is that during the production process some servos are defective. I often use another model control board to operate it. But for some boards, the model doesn't match. But the code on the boards is exactly the same. I tried to change their model but couldn't. Is it possible to change their model and does anyone know? Please guide me. Thanks a lot.