e-licktronic Forum

I am not sure what happened, but midi doesn't work anymore. When I listen to midi out via MIOS studio, it keeps sending c2 off. If I change the ch., nothing happens. What could it be? Where should I start troubleshooting?

check connection between I/O and main boards first, after optocoupler...

Thanks for the reply. Luckily I had a spare optocoupler at home, and sure enough replacing it worked!