The fault lights are blinking. No audio output.
How can we troublshoot?
Have read the fault conditions, but not sure how to determine which condition it is.
If the amp is going into protect without audio passing it could very well be an internal short. In this case audio typically won't pass at line level. Have you tried turning the input gain stage knobs all the way down as well as the source material and slowly creep the volumes up? If it takes some audio before it faults you may want to double check the load you are placing on the amp's outputs. I'm assuming at this point it doesn't matter what speakers you are hooking it up too, it still crashed on you. Remember that Audio can be measured in voltage as well so you can measure the outputs of the amp with a volt-ohm meter.
It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.
It is not so easy to probe into to find a protection fault condition. The fault can be your output drivers- the MOSFETS fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes.
If so replace the outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit.Also disconnect the speakers and test, if the protect is off then check for short on the speakers.
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