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Servo light on onkyo m-504 does not come on - Audio Players & Recorders

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  • Anonymous Aug 11, 2008

    I have a same problem... what should I do ?

  • Anonymous Oct 30, 2008

    Same problem and not sure what it would take to fix it?


    Any feedback would be great!


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Sorry, no easy answer to this one. The servo light not coming on usually means the protection circuit is sensing an issue with one, or both channels, and not allowing the speaker relay to close. One bad channel can cause no output from both channels. This could be caused by one or more bad capacitors, (common in older amplifiers) or a more severe problem, like blown semiconductors. Only way to find out is to have a competent technician pull the cover, and make some voltage checks at key test points inside the amp. This is not a do it yourself job.

Posted on Dec 31, 2008

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Posted on Jan 02, 2017

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