Question about JVC Audio Players & Recorders

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I have an old JVC RX-707 VTN that powers up and I hear the click however it has no output at any of the speaker output terminals. I would like to ask is where to start looking to fix it. Thanks..Jim H.

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  • Jim H Apr 04, 2011

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  • Jim H Apr 04, 2011

    Tried exactly as you stated. I do have (distorted) sound from the headphone jack using FM tuner..And intermittent sound thru the "front speaker" jack using the "speaker 1" button on the front of the unit. However all sound is low and distorted and the amp clicks on and off with the speakers hooked up as if the protection circuit is coming on . Any more advice would be very nice.. Thank You !!

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  • Master
  • 8,546 Answers

Start looking at all the indicators and switches that might reveal an unwanted source, tape, mute selection. Does it tune an FM station? THAT would be a good source to use for troubleshooting as it relies on NO external devices or connections. How about headphones?

Posted on Apr 03, 2011

Testimonial: "Thanks fort the quick reply to my post !! Tried what you said !! Moved me forward a bit.. THANKS !! "

  • David Dunn
    David Dunn Apr 04, 2011

    Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

    Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

    You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

    If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

    If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

    Old units suffer from oxidized or corroded contacts which can lead to silence or crackly intermittent sound.

    Everything in the signal path can interefere with good audio, especially the rarely used switches as their contacts never get any physical exercise to wear off the corrosion. Typically, it might be a switch you rarely use, like a Tape Monitor or Mute. It's wise to occasionally (with power OFF) manipulate all manual controls throughput their ranges a number of times to wipe oxides from their contacts or apply spray contact cleaner (Tuner cleaner as we called it in the 60's) to switches if you have access to them.

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