This equipment arrived to me working perfectly but the fans do not work therefore it warms a barbarity and the tracks that go to the speakers are overheated and also the coils that go in series with the speakers. The voltage that I measure in positive of the fans is of 8 volt, (this voltage of 8 v comes from 12v but drops to 8 after going through 2 transistors, I actually have the source diagram but I have trouble interpreting its operation, I have tested capacitors, diodes, etc. but I can't get it to work .Hope help, advice, .From already thank you