Hello everybody,

I have a Technics PX66 which is producing no sound. All the LED's appear
as they should, just no sound from speakers or headphones. Very occasionally,
the piano works perfectly. MIDI always works fine.

Does anyone know where I can get hold of the schematics for the PCB's or a service manual?

I have an electronics background, but tracking this fault down without a drawing is
proving difficult! I've checked obvious things like voltage levels etc.