Is there anything on top of the av receiver? Try and run the reciever so that it has enough cooling. B) Allthough overload, there is a possibillity it is causes by speakercables who are shortcircuiting once in a while. Usually somewhere at the back of the reciever or speakers.
SOURCE: My Technics AV Control Receiver SA AX530 is in overload
An amplifier should never be turn on without speakers, it will overload internally.
make sure speakers work and try again.
SOURCE: My Technics SA-AX540 AV Control
Heat? Generally speaking, an amp protects itself from heat, shorts and overloads 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 as a root cause for intermittent shutdown.
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