Question about JVC KS-AX4700 Car Audio Amplifier

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JVC KS-AX4700 doesnt work

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.

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  • Jesse Long Aug 17, 2006

    The posted article only diagnoses user problems. I am experienced with car audio instalations. I need an electricians help diagnosing what to fix inside the amp.

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

Posted on Aug 17, 2006

  • Jexx Jexx
    Jexx Jexx Aug 18, 2006

    Get a new amp. JVC is pure trash.

    You're looking for a technician, not an electrician.

    Check your gains and head unit settings.

    "I am good at technical things, although I have very little electronics experience."

    Then you can't fix it.

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2 Answers

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.

Cindy Wells

Apr 11, 2015 | JVC Car Audio & Video

1 Answer

Power light doesnt even come on when I plug mu JVC sub woofer sxpw 850. Does it mean its kaput and time to buy a new one? thanks


There are usually fuses in appliances like that but I don"t know if they are even change able so I would say it would be a better idea to get a new one, just save a little time and hassle.

Jan 15, 2011 | JVC Televison & Video

1 Answer

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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My jvc ax6300 amp is wired in and the protection light is on. no sound from the subs?


Try to rest amp (turn off power) be sure subs are disconnected. Se if protection light comes on. If it does the amp needs to be serviced porbably a burnt component. If the protection light does not come on, connect one sub at a time to see if either one surges. Could also be that the gain is turned up too much.

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1 Answer

Sub cutting out


Check the 12v wire running from the battery to the amplifier. Also the sony explode is a garbage subwoofer compared to the Alpine.. sony (they say 1200w max but its more like 100w to power the thing) Amp could be going. Is the amplifier hot when running. If there is a burnt smell comming from the amp, its the amplifier

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Color code for speaker out on a JVC KS R140 car casette player


White - left front
Grey - right front
Green - left rear
Purple - right rear
Yellow - memory power
Blue - remote power (power ant, amp or eq power)

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I have a jvc KD-G320 cd player and i am trying to hook it up to my 2 12" subs n the cd player doesnt seem to b sending the message to the subs to kick is there anything special i have to get to make...


ok first make sure all the leads are good
remote
and rca leads
check power to amp
then go in to settings in the head unit and change from rear to woofer and then do sub contol on high

Aug 16, 2008 | JVC Car Audio & Video

1 Answer

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.

Aug 17, 2006 | JVC KS-AX4700 Car Audio Amplifier

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