JVC-RX501 Stereo Receiver Low Volume

[mikay786]

Seems this receiver i got from carboot isnt working properly.

Barely any sound coming out of it, very low volume even at max and quite distorted. Same on headphones. Fuses are good.

I've got the schematics, see attached.

on P301 getting correct voltages

6v
14v
gnd
-15
+15

Any suggestions where i should be looking.