Question about JVC TH-M303 System

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No sound. I have no sound through my system, the woofer light comes on and everything else seems to be working. After searching through your solutions page I plugged my headphones in and got sound back. Any advice or is it screwed?

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  • Marbron Apr 02, 2008

    Thanks for prompt response Dan. No cant get any sound other than through the headphones. Weird.

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Did you get sound through the entire system after plugging in the headphones? If so, the headphone jack is acting as a switch and probably has some dirt/debris that should be cleaned. The easiest way to do this is to get some electronic switch cleaner (one that contains a lubricant as well) and spray into the headphone jack. Insert and remove the headphoe plug a number of times and the problem should be resolved.
Update this if the problem returns and we'll look further.
Dan

Posted on Apr 02, 2008

  • ABRsvcs Apr 02, 2008

    Ok. That helps a bit. The "amp" for the headphone can be different that the amp for the remainder of the system depending on the design. In your particular case, the headphone amp is most likely a 4558 chip. That means that the output amp is in protect mode. There is a problem in the final stage that is preventing the system from turning on the speakers. This is to prevent damage to either the speakers or the amp itself. I believe that this model uses discrete transistors, so that the parts will run $15-$25. Add to that the local labor rate for the compete repair cost.

    Dan

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You need to test both unit in order to detect which of the two is giving the fault, so that you can concentrate on the faulty unit.

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