Replaced the power supply fets a couple of diodes and the SG3525
Amp still doesn’t power up here is what I get on the 3525
Pin 1:0.00
Pin 2:5.04
Pin 3:0.00
Pin 4:0.26
Pin 5:2.06
Pin 6:3.48
Pin 7:2.06
Pin 8:0.28
Pin 9:6.28
Pin 10:3.80
Pin 11:0.00
Pin 12:0.00
Pin 13:13.72
Pin 14:0.00
Pin 15:13.72
Pin 16.5.06
Amp still doesn’t power up here is what I get on the 3525
Pin 1:0.00
Pin 2:5.04
Pin 3:0.00
Pin 4:0.26
Pin 5:2.06
Pin 6:3.48
Pin 7:2.06
Pin 8:0.28
Pin 9:6.28
Pin 10:3.80
Pin 11:0.00
Pin 12:0.00
Pin 13:13.72
Pin 14:0.00
Pin 15:13.72
Pin 16.5.06
Pin 10 goes to a 2N4401 is transistor here are the voltages on that transistor
Emitter:0.00
Base:0.00
Collector 3.80
Or what should I look at to see why pin 10 is high
Emitter:0.00
Base:0.00
Collector 3.80
Or what should I look at to see why pin 10 is high
I have nothing on this amp but it would appear that the voltage is coming from something other than that transistor.
Back to this amp .
Pin 10 on the 3525 is at 4 volts which is high making the amp not power up .
I pulled the rectifiers in the amp and also pulled the power supply fets .
Same issue pin 10 is still at 4 volts .
My question is does pulling the rectifiers eliminate the output section as being the cause of pin 10 going high and the problem is likely in the power supply section or even with the rectifiers out of circuit I could still have an issue in the output section causing pin 10 to go high
Pin 10 on the 3525 is at 4 volts which is high making the amp not power up .
I pulled the rectifiers in the amp and also pulled the power supply fets .
Same issue pin 10 is still at 4 volts .
My question is does pulling the rectifiers eliminate the output section as being the cause of pin 10 going high and the problem is likely in the power supply section or even with the rectifiers out of circuit I could still have an issue in the output section causing pin 10 to go high
Only thing I see connected to pin 10 is a 2N4401 transistor I replaced it and same issue .
So the voltage is coming from somewhere in the amp
But not sure where .
So the voltage is coming from somewhere in the amp
But not sure where .
I don’t get this amp . Pretty much everything on the power supply is new .
With just power and ground hooked up I still get 4 volts on pin 10
With just power and ground hooked up I still get 4 volts on pin 10
When you pulled the IC, did you look at the traces under it to see if pin 10 went anywhere on top of the board?
Is the IC in a socket?
Is the IC in a socket?
Lifted pin 10 amp powers up with no remote .
And the transformer squeals and the fets get hot .
Amp produces no output
And the transformer squeals and the fets get hot .
Amp produces no output