JBL PRX 612M - Профессиональная аудиоаппаратура - стр-1 - Профессиональное аудио и световое оборудование

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JBL PRX 612M

onlysteg

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Hello guys, as I mentioned in another post, I have no audio output from the 2 high and low channels of my PRX 612M, I have the screen only of the amplifier section but not of the modulation section.
As soon as I turned it on I saw the 8.2ohm zobel resistors smoking but I don't understand why I have no audio output.
I noticed a very strange thing, on the modulator circuit I have the audio signal up to pin 1 of the MC33079D (point-x) but in my circuit the R119 resistor is missing and therefore I have no audio at the C114 capacitor.
The same thing for the other channel, IDENTICAL.
I tried to put a 3.8K resistor and I saw smoke coming out of the 8.2ohm Zobel network resistors at the output.
I would like to point out that my product is a PRX612M but the diagram I have is from the PRX 535 and I do not have the original diagram of the PRX 612M modulator.
I cannot understand how the audio can pass if that resistor is missing.
I measured the Frequency on LF DRV-R and LF DRV-L and it is 250Khz

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[05.11.2024, 12:02]