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The wiring is bad on the plugs and shorting out, or whatever is on the end of the cable has an issue. Also look along the cable for rodent, cat, dog chewing.
Questions like this need 'make model (what is is) of every item involved. On a vehicle 'year make model' as well.
The bad ground causes the amplifier to go into the protect mode. So, make sure to check the grounding wire and overall connection to figure it out and set back the amplifier to its normal mode. Feb 15, 2023
A common problem for these is bad capacitors in the power supply, Remove the back from your Amplifier and look at the power supply on the middle section of the amplifier
You will see bid round capacitor that are bulged / domed shaped on top usually these are valued any that have bulged or leaked a brown like substance should be changed. This will cure the problem as they overheat being sat next to a heatsink that gets very hot! Try and change them for the same capacitor rating but a higher voltage. Hope this help in solving the problem....
Are you getting any sound output at all from amplifier?
Is there a popping or banging coming from speaker?
It could possibly be a faulty output mosfet that is ocillating cause DC to leak onto the speaker output causing it to flip into protect.
please advise
thanks,ben
According to the service manual, there is an output failure.
It's not off of the phone jack ckt.
Either a short at one output or output amp fail.
Probably will need service
It when into protection mode either because something shorted, or it was over loaded, or over heated.
Disconnect the power for 5 minutes then hook it back up.
If after doing this it still remains in protected mode, there could be a more serious problem.
If it comes out of protection, and it goes back to protected mode a lot, then you have you ohm load wired too low. The amplifier cannot handle that low of an ohm load.
Disconnect the speakers. Measure their resistance from black to red with an ohmmeter/DMM to make sure that a shorted voice coil did not cause the shutdown
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