Question about JVC KS-AX4500 Car Audio Amplifier

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Jvc ks-ax4500 will not stay on.

I have hooked it up correctly but power turns off after about 30 seconds. can you help please?

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Check the remote terminal for a dissapearing voltage...it should stay at +12vdc for all the time it is ON. hope it helps.

Posted on Oct 17, 2008

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Everything is hooked up fine. the amp has power but no sound. I opened the amp and nothing looks burnt out.


Try you sub(s) on another amp...if they play off of it then its either your speaker outputs off of the amp or your rcas or wire from your radio are bad.

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You must have gotten the power lines mixed up. You need to connect the power to the amp and radio the the switched side of the power supply. Or, you connected the amp power and the amp switch wire, usually the blue wire in reverse.

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Check your GROUND wire might be touching something and making bad contact.

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I cannot find the specs or user manual on the JVC archived items list. A few sites want to charge $10.00 for the user guide info, but I think that is too much to charge.


Defiantely not 200 watts
KS-A82
  • 2 Channel Amplifier
  • Bridgeable 2 channel amplifier
  • Output power: 25W x 2, 20 - 40,000 hz at .08 THD
  • 2 ohm stable
  • Adjustable gain (.1 - 2v)
  • MOS-FET DC-DC converter
  • Multi phase connection
  • 1 Pair of line input terminals
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  • MSRP: $159.95
http://www.admtechusa.com/JVC.html#KS-A82

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2 Answers

Power Protectin stays on


Sounds like you have blown your amplifier. There could be severqal causes for this happening. Take it to an electronics repair shop, but honestly you might just be better off replacing it altogether.

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JVC KS-AX4700


It sounds like you have blown your Output amplifier MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) You will see some components with metal tabs, these are some of those along with some secondary stage pre driver transistors also screwed to the metal case (heat sink). Ok you will need some pieces of equipment. First you will need a schematic of the unit (never work without a schematic), second you will need a volt ohmeter (yes I am old) you might call it a multimeter. Now this is the bare minimum of equipment you need. first open ope the scematic and find the main voltage rails and test points, these will be important as you traces the source of your problem down. I want you to take measure ments of the test points and compare them to the measurements in the schematic, the places where the diffences are dramatic are the places the problem may be. remeber take these measurements and compare them to the schematic and then try to isolate the problem down to the components that are truly bad. Also pick up a book on how to repair audio amplifiers. This is the best I can do over the internet, happy hunting my friend.

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1 Answer

JVC KS-AX4700 doesnt work


Check this out: http://www.techlore.com/article/14696/

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