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Posted on Aug 16, 2007
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Stuck in protect mode

Hello, My Onkyo TX-sv454 is stuck in protect mode. I opened case and I don't see any problems. Is it possible for me to reset it. Thanks

  • Anonymous May 16, 2009

    My Onkyo TX SV454 receiver turns off immediately after turning it on. It says "PROTECT". Help!



    Mitch

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  • Posted on Dec 11, 2008
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I believe protect mode is because you have the wrong impedence speakers, they are too low (4 ohm? 6 ohm?) it chols work with 8 ohm speakers

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  • Posted on Jun 26, 2019
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Onkyo TX-SV454 Speaker impedance set ranges...If you are using A or B :6 ohms min./speaker. If you are using A plus B :12ohms min./speaker. Rear (surround) speakers 6 ohms min. /speaker. Center speaker 6 ohms min. These are the guidelines to follow from manufacturers settings. If you are in range of these guidelines and “protect” still reads, you have another problem.

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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.

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So what do i do if when i turn my onkyo tx-sv454 receiver on it says protect and then shuts off? How do i fix that or get around it? please help me....

I don't think you can fix it, unless you're skilled with electronics. Possibility that something has occurred internally with a circuit board etc so the system shuts down in order to protect itself from catching on fire etc. Get it services. Might not be too bad of an issue, but certainly not a bypass.
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