Question about Onkyo TX-SR500 Receiver

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No power AMPLIFIER PROTECTION HASBEEN ACTIVATED

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  • Otto14 Feb 18, 2009

    After pressing the Power switch, the display lights up and immediately goes dead. I have no speakers or components connected to the receiver.



    According to my manual, the Amplifier Protection Circuitry has been activated, and only remedy is to contact an Onkyo Svc Ctr. I requested assistance with the problem on the Onkyo website 3 days ago, but they have not yet contacted me.



    Can I fix the Amp Protection Circuitry myself?

  • Anonymous Mar 02, 2009

    turn on the power and the receiver shuts off a second later.the standby light flashes.manual said amplifier protection circuit activated contact onkyo service center.called 1 8002291687 pressed promp #3 then got hung up on without even talking to someone.

  • rporter556 Apr 13, 2009

    I have the same problem. There are no wires touching. It will do it with nothing hooked to it.

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My receiver has a similar problem. So far I have found a pair of output transistors fried shorted E to B to C (Q6051 and Q6061) and the associated ceramic current limiting resistor array (R6101) failed open. These bad components will definitely be sensed by the protection circuitry as an overload condition. I ordered some replacement transistors from Mouser (2STC4467 and 2STA1694) and the resistor (RSS2WK-0.22 ) from Encompass.

https://www.encompassparts.com/

I will let you know if this corrects the problem once the parts are installed. I also got a service manual from www.user-manuals.com which helps a lot.

Posted on May 02, 2009

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Check your speaker cables are not touching at the back of your amp or speakers.

Posted on May 27, 2008

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