Question about JVC KD-G720 CD Player

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Faulty speakers or deck

When i use my rear speakers (clarion) my deck(jvc kdg 720) stops outputing sound and i have to shut it off and unplug the speakers to make it work is it the deck or the speakers this is the second set of speakers that i had.

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  • cheyner Mar 18, 2008

    im about to take my deck apart, it will play the music, as in i see the level going as if listening to music, but not even static comes out of the speakers, i thought it was my harness but i hooked my deck up via the rca cables and its still the same thing, please somebody help, i literally only listen to musci in my car and this is making me insane

  • Anonymous Apr 14, 2009

    It worked today... This unit has been cutting out and lights on deck stay on. If i fiddle with volume nob it sometimes works? This started after driving over bumpy Michigan bumps, oh we call them roads...

  • Anonymous May 11, 2010

    A solution to these problems could be a number of things. Are you hooking up an aftermarket radio to a factory system that has an amp(s)? Jombi:it sounds like you have a short somewhere in your systems rear speaker wiring. Trace that wiring down and rewire if necessary. Cheyner: do you have an external amp in your system or are you using the internal one in the radio? If your speakers are connected to the radios speaker outputs then you'd be powering them off the internal amp. By saying you hooked the radio up with rca cables would mean that you are sending a preamp signal to an outboard amplifier. The speakers would then have to be wired to the speaker outputs of the external amp to get sound. Make sure you're using preamp outputs designed for the purpose at hand: Are you wanting fullrange sound or are you trying to power a sub? Check to make sure you're using the correct set of preamp outputs and check your radios menu to verify that they are turned on. Check your fader settings too and stay sane!



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The speakers are probably grounding out somehow, check the connections or for rust, my door speakers were rusty and grounded out, i just wrapped some electrical tape around the parts that touched the doors and i havent had any problems since, good luck, i went 6 months befoe i figured it out, i hope tis helps

Posted on Oct 02, 2008


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I have had this problem before. The first thing you have to do is fade the deck all the way to the rear. Now turn the deck off and than back on see if you have sound now? IF not fade the deck all the way to the front and turn the deck off and than back on see if you have sound now? What you are doing is checking for a bad speaker because if you have a grounded speaker it will shut off the decks internal amp. You can do this though out the left and right as well to find if is a that. Now if nothing you do helps you might have to replace the deck. IF you want to get carried away you can check the OHM,s on each speaker and check each speaker to a ground with an OHM meter and if you have any speaker that shows a speaker lead that shows a ground start chasing that wire and see if it has a screw through it. Go all the way to the speaker. You will probably find a bad speaker that has shut off you system ?

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The "Front output" from the Pioneer deck would connect to the "Main In" on the Clarion EQ. I'm assuming that your Clarion EQ can only deal with one input, and will send the adjusted (equalized) signal out both of the outputs.
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The "Sub output" from the Pioneer deck would connect to the Left/Right Input on the Epicenter. The Left/Right Output on the Epicenter would need a Y-splitter for each side, so that you could connect each amp separately. One suggestion would be to use one sub amp for both subs.

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Remove all the speaker wires.

Power the radio back on and verify it is not the radio at fault.

If it powers up, check the speakers with a Digital Multimeter set to OHMS 20x.

Each speaker should have a resistance of 4 ohms. (or 8 in some cases)

Any variance (+/- .5ohms) means the voicecoil is blown, and replace that speaker.

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