Question about Onkyo TX-8211 Receiver

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TX-8211 FM Stereo/AM Receiver All has been fine

TX-8211 FM Stereo/AM Receiver All has been fine for years, I just readjusted speaker wires. Now, the unit is on & in just a matter of seconds the display changes to PROTECT & all goes off.

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The protection circuit in your receiver can be tripped by reversing the wires of the speakers, or also by making the wires to the speakers too long. If you are using regular speaker wire, it won't take much of it to raise the resistance to the point of tripping the circuit. However, if you are using premium wire there shouldn't be a problem. The next thing to check would be the polarity of the speakers. Make sure that you are using the same wires for the "-" and "+" sides of the speaker connections. If all of the connections to the speakers are correct the next thing to try is to disconnect the speakers from the receiver and then turn the unit on. If the protection circuit doesn't kick in then the speakers are the problem. If the protection circuit does still kick in then you either have a short, or something is overheating. At this point, unless you have the experience, tools, and the service manual, it would be time to take the receiver in to an Onkyo repair center in your area.

If you do have the tools and experience you can download a copy of the service manual from the following link:

http://www.givemefile.net/smanuals/radios/onkyo/tx-8211.html

The file is in the pdf format. If you don't already have the Adobe Free Reader you can download it from this website:

http://get.adobe.com/reader/

Just click on the orange box that has the word DOWNLOAD in it. If you save the file to your Desktop all you have to do is double-click the icon that it creates and the reader will install itself. You can then double-click the file for your manual and it will automatically load the reader and display itself in the reader.

Posted on Mar 19, 2011

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Make sure that somehow the wires didn't get loose from the speakers in the back. Protect means that it's overloaded. Did you change the plus wires with minus wires maybe. Check to make sure all the wires are good.

Posted on Mar 19, 2011

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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.

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Those "black/red spring loaded wire inputs" are speaker outputs and if you hook one of those to an innocent audio device's Line In connections you might kiss it all goodbye.

Read the manual...

http://www.retrevo.com/support/Onkyo-TX-8211-Receivers-manual/id/365ci165/t/2/

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Eliminate the short or overheating problem it thinks exists. Disconnect all speakers first to see if one of them is the culprit. If it's internal, take it to a shop.

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