Phoenix Gold XS4600 blown trace

[jrodajames]

Yes

 

[Perry Babin]

DC volts, not millivolts.

The drivers will need to be in the circuit.

 

[jrodajames]

I had the meter on mv not V let me recheck.

 

[jrodajames]

With the fets in circuit the fuse blows.

 

[Perry Babin]

NO PS FETs. The drivers are near the 3525.

 

[jrodajames]

With the fets removed

Q7 g- 9.21
Q7 d- 13.25

Q8 g- 9.21
Q8 d- 13.25

Q9 g - 9.21
Q9 d- 13.25

Q10 g- 9.20
Q10 d- 13.25

Q11 g- 9.20
Q11 d- 13.25

Q12 g- 9.20
Q12 d- 13.25

 

[jrodajames]

Yes, they are in circuit.

 

[Perry Babin]

What's the DC voltage on the collector of the PNP driver?

DC voltage on pins 11 and 14 of the SG3525?

 

[jrodajames]

 

[jrodajames]

Q3-e, 9.2
Q5-e, 9.2

Sg3525
Pin 11- 9.75
Pin 14- 9.97

 

[Perry Babin]

Collector, not the emitter.

DC voltage on pins 12 and 13 of the 3525?

 

[jrodajames]

Sorry still sipping my first cup of coffee

Q3-c, 9.75
Q5-c, 9.75
3525
Pin 12- 9.76
Pin 13- 10.55

 

[Perry Babin]

What's the resistance between pin 12 of the 3525 and the burned trace near the cap?

 

[jrodajames]

3.075 k-ohms

 

[Perry Babin]

Connect pin 12 of the 3525 to the amp's ground terminal. Then re-measure the DCV on the gate pads of the PS FETs.

 

[jrodajames]

All gates 8.42-8.40

 

[Perry Babin]

Is that with pin 12 connected to ground?

 

[jrodajames]

Yes

 

[Perry Babin]

DCV on pin 12?

 

[jrodajames]

.007 with it connected to ground terminal