iI search for a Schematic for a yamaha px8 or any of the PX models

[mattiesuk]

Would be so grateful if anyone has a schematic for any of the yammy PX series class D power amps

thanks for any help

[sugeda]

...

[mattiesuk]

Many thanks for that - will help me out a great deal!

[mattiesuk]

Sugeda, Do you have any experience repairing any of these amps?

The complaint is that it shuts-down within seconds of power up. I am guessing that the output FETs on one or both channels have shorted causing an over-current, which the psu detects on power-up and shuts down.

usually when FET's blow shorted, they take out their driver. All that is fine so far,easy to repair but I see the FET driver is DIRECTLY connected to a YAMAHA ASIC DSP and if that's gone pop, then it's game over really.

Just wondering if usually the DSP ASIC survives a blown FET driver? That's is the real crux of my question - any help appreciated