Hifonics pwm board 2610 081013

[Perry Babin]

Is the diode original?

Is R7 REALLY hot?

 

[Mjimenez]

The diode is not original and the r7 not hot

 

[Perry Babin]

I think the diode is wrong and the resistor is blown. I have the resistor as an 8,2v Zener in notes. I know that it should be a 17v Zener with the J2 mark but that may not be right.

 

[Mjimenez]

I went back, and put the diode and change resistance now, how much voltage should I have here pin 3 and 6?

 

[Perry Babin]

3 should be 12v above the negative rail.

6 should be 12v above the positive rail.

 

[Mjimenez]

Oky I think it's wrong here pin 3, I have on the rails +47 and -47, on pin 3 -47v and pin 6 + 60v but a dont know wy

 

[Mjimenez]

What voltages or signals must enter and exit U1, U2 and U3?
Audio is not yet output at the speaker terminals and I have tracked the audio signal and it reaches Q13

 

[Perry Babin]

Those drive emitter followers so a standard drive signal is what you can expect to see.

Q13 isn't an audio transistor. It's the CCS.