Hello
I have a jl A1800 amplifier. I had all the source fets and drivers damaged. I already changed the 3525 one new and one used.
The problem is that I do not have high voltage on the 63v 3300uf capacitors
UC3525
Pin 1: 0.002
Pin 2: 5.008
Pin 3: 0.260
Pin 4: 0.430
Pin 5: 1.863
Pin 6: 3.76
Pin 7: 1.778
Pin 8: 0.085
Pin 9: 5.75
Pin 10: 0.049
Pin 11: 0.003
Pin 12: 0.001
Pin 13: 13.21
Pin 14: 0.003
Pin 15: 13.21
Pin 16: 5.08
I have a jl A1800 amplifier. I had all the source fets and drivers damaged. I already changed the 3525 one new and one used.
The problem is that I do not have high voltage on the 63v 3300uf capacitors
UC3525
Pin 1: 0.002
Pin 2: 5.008
Pin 3: 0.260
Pin 4: 0.430
Pin 5: 1.863
Pin 6: 3.76
Pin 7: 1.778
Pin 8: 0.085
Pin 9: 5.75
Pin 10: 0.049
Pin 11: 0.003
Pin 12: 0.001
Pin 13: 13.21
Pin 14: 0.003
Pin 15: 13.21
Pin 16: 5.08
IS it correct that you have the same symptoms with 2 different ICs?
What's the DC voltage on all 3 legs of the J111 transistor at the end of the 3525 IC?
What's the DC voltage on all 3 legs of the J111 transistor at the end of the 3525 IC?
With pin #8 disconnected .The IC pin 8 measures 4.89v
And the amplifier works normally
There is an electrolytic capacitor connected to that pin. It could be bad. There may also be another transistor (NPN, BJT). If the cap isn't defective. Find that other transistor. I think it will be connected between that pin and ground.
