Hey all, I’m trying to fix a nano soul preacher for a friend. My friend was playind with the SP and all of a sudden it stopped working literarly. When it is switched off since it is a true bypass, the unprocessed signal flows and can be heard through the amp but once the SP is on, there is no sound at all.

I first checked the 3pdt switch which works like a charm, so nothing there.
Both D.C. and battery work
Had a small problem with the volume pot which I changed to a B10K instead of the original A10K, so its linear it still does the job.

Still the nano SP doesn’t work, any hints on where else to look. Is there a schematic explaining what each electronic part is used at least as a block diagran?

Cheers in advance…