Help Eurovox amplifier model: EV-A1000D does not have audio

[baldor]

The eurovox brand amplifier, model: EV-A1000D
This amplifier does not have audio. Check with the oscilloscope. I do not have a pulse train in the gate. Apparently the transistors Q110, Q111, Q112 were manipulated. I don't know if they are the correct license plates. If anyone had information about the amplifier or which pulses to check, I would appreciate it. much Greetings.

 

[Perry Babin]

Is the attached diagram remotely similar?

 

[baldor]

Thanks for responding Perry Babin and share the pdf file, but a complete photo will help better, since the wave to excite the mosfets of the digital amplifier comes precisely from those drive transients that seem to have been removed

 

[Perry Babin]

If you drive a signal into the amp, do you get a drive signal to the IC U2?

Is the attached diagram better for you?

 

[baldor]

If audio comes out of the U2 integrated circuit at terminal number 1 and number 7, something interesting is how it compares the audio signal and triangular signal to generate the square pulses.The drive module is integrated into the PCB.

 

[Perry Babin]

This amp isn't clocked and doesn't use a triangle waveform.

Do you see the audio input frequency at the output FET gate legs?

Are the transistors you were concerned about the correct parts?

 

[baldor]

There is no frequency in the gates of the average power mosfets in the L drive gates it has 0.3 volts and in Hdrive it has 68.5 volts and Are the transistors you were concerned about the correct parts?I don't know

 

[Perry Babin]

Were you driving a strong signal into the amp?

Did you see the signal on the input of the driver board?

 

[baldor]

I added a 6 volt signal of a 100 Hz sine tone but this does not have an independent drive control module. It comes on the integrated pcb. I am creating a small diagram to analyze it.

 

[Perry Babin]

Look at the output pins of the op-amp at the front-end of the driver circuit.