Question about Technics SA-AX730 Receiver

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Actually, I have an AX 710. I only use it for listening to FM and vinyl. The past few months, when it is powered up, it warns me "OVERLOAD" shut of and on. After numberous repeated attempts, it will generally turn on. Regardless of phono or FM stereo being last used, it will do this. Speaker wires have been cleaned (bare wire into connections at both ends) and all other connections seem to be just fine. I bought this unit used (under $100,) and it worked just fine until recently. The box sits on its own shelf, in a well circulated area. Any clues?

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You know most of this....

What about heat and shorted speakers?

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.


Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

Posted on Mar 12, 2011

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