The Yamaha AN1x Synthesizer mailing list

There opamps 4750 dual opamp have you checked the psu as if its not working correctly you get distortion on the outputs I had this on my old yamaha an1x wallwart

Ill look at the schematic as I dont see any transistors or jfets in that area you are showing so the muting circuits mogjt be before those

I would get a scope and look at the signal before and after the opamps to see if your getting the correct signals with no distortion thats the only way to see if a opamp is working correctly or not

Hi,

thanks for the info, is this what you are talking about...

http://imgur.com/MliwCNx