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My new jvc ks az4302 goes straight to power protect as soon as its turned on. i unplugged the speaker wires but it still did it. how do i fix this?

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Hello, Is this amplifier new to you or new out of the box? To make sure there are no other factors involved here. Assuming this is new out of the box we will check some things. Protection mode is to do just that, protect your amp for blowing.

  1. First thing is to check the on board fuse on the amp itself. Make sure it is not blown.
  2. Next thing you want to check is your ground wire and connection. Make sure this is solidly connected to the frame of your vehicle. Don't bolt the wire down with frayed wires either. Use a ring style connector and clamp it on good to your wire and then run your bolt through this.
  3. The next this you want to do is recheck all your connections especially the power wire and ground wire and remote wires where you attached them on the amplifier. It is tight quarters there and it only takes one little stray strand of a wire to short your amplifier out and send it into protection mode.
  4. Make sure the Ohms of the amp is the same as the Ohms of the speakers. If you are "bridging" the speakers this can be an issue for some amps.
  5. After this point and checking all of this remove the power source and try it again. If protection mode occurs again, with the speakers disconnected, you will need to diagnose the RCA shields of the head unit and the board itself. The steps I listed are simple checks that would be the fault of the one hooking this amp up. If your amp continues to go into protection mode, being new out of the box, then at this point, this is a manufacturer defect and it should be returned for a new one.
Regards, Tony

Posted on Mar 25, 2011


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My jvc ks-ax4302 goes straight to protection when I turn it on, just curious what could be the cause and where could I find a schematic of the mother board?

If the Power/Protect LED is red, usually the speaker wiring has a short-circuit or the speaker total impedance is wrong for the system. The most common issue is a bare spot on a speaker wire that is coming in contact with part of the car or another bare wire. Sometimes, it just means that the system got too hot.

Before you look for a problem with the KS-AX4302 board, look at your wiring and replace any damaged wires.

I hope this helps.

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This is caused by only a few things, shorted speaker wiring, shorted speaker voice coil or shorted output circuit in the amp, which is usually one of the large power transistors. Disconnect all the speakers and see if the protect comes on, if not you have a problem in the speaker circuit.

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