Question about JVC KS-AX4700 Car Audio Amplifier

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JVC KS-AX4700 My JVC KS-AX4700 no longer works. When it is hooked up, very little power comes out (meaning subs barely hit, but some noise is heard). I have it apart, and I would love to fix it myself. Can someone help me out as to what the common parts that go are? What should I look for? Is it OK to dissassemble the board from the casing? Is it possible that there is still electricity stored in it (it was "undone" more than a month ago)? Any help would be appreciated. I am good at technical things, although I have very little electronics experience. A person posted an article that had help on making sure it is set up right. I am experienced in installing audio systems, I know it is the amp.

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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.

Posted on Sep 06, 2007

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Posted on Jan 02, 2017

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

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