Question about Onkyo TX-SR605 Receiver

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The amp protection circuit was actived - what should we do?

My husband was sliding the unit out from the cabinet and one of the wires
came out. He referred to the users manual and under trouble shooting it mentioned the amp protection circuit.

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  • 336 Answers

Remove all speaker wires from the receiver and turn it on.

If it still goes into protect, I'll bet the house that one of the channels is shorted out and it needs repair. This is a job for a pro.

If it doesn't go into protect, check for a short in the speaker wire or for a bad speaker.

Posted on Jan 29, 2009

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How do i eliminate amp protection. Unit goes no further. Tried to unplug the unit & plugged back in but problem persists. Please HELP!!!!!


This is a very ambiguous post. When you say that you are having this problem, what are you doing? Please post all the steps that lead to this error. There is no way to disable the amplifier protection circuit. If it senses a short (which could be a bad speaker) then it will be activated.

Dec 12, 2014 | NAD T748 Home theater receiver with...

1 Answer

Can't open,in protect mode


Hi:
First disconnect all speakers from the unit and then try turning the unit on too see if it still goes to protect mode. Protect mode is a shut down feature that shuts down the unit because of a shorted speaker or speaker wires are touching each other. If the unit does not shut down after disconnecting all speakers then reconnect them one at a time while turing the unit on after each conncection until you find the shorted speaker. If it shuts down with no speakers attached to it then you have a internal problem with the amplifier section, probably a shorted output transistor in the Amp circuit or preamp circuit.

Jul 08, 2011 | Yamaha Audio & Video Receivers

1 Answer

Unit is flashing protector volume does not work


The protective device on the receiver has been activated because of a short circuit.

("PROTECTOR" flashes.) Turn off the receiver, eliminate the short-circuit problem and turn on the power again.

http://www.docs.sony.com/release/STRGA8ES.pdf

Generally speaking, an amp protects itself from heat, shorts and overloads.


Overloads can be from excessive periods of high output 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 hands-on tech.

Jan 22, 2011 | Sony STR-GA8ES Receiver

1 Answer

Protect circuit activated........where to look for defects?


Typically a shorted speaker output. CHeck where your speaker wires are and see if there's just one wisker of wire touching the adjacent terminal. Check the back of the amp (easier said than done) and then check the back of the speakers themselves. Second most common issue is overheating. People leave an LP covering the ventilation openings on top of the amp and wonder why it overheats, so make sure you have air ventilation. Speaker wiring, then ventilation. Unplug unit, plug back in again, and power on and see if your problem goes away; if not, come back and we'll see what else we can try for you - okay?

Aug 13, 2010 | Sony STR-DE615 Receiver

1 Answer

Power will not stay on


Activated protection circuitry means that the amplifier is seeing conditions it does not like and is shutting down the power to prevent further damage.
Either you have a short in your speaker wires, in your speakers, or a blown amplifier.
Disconnect both speakers and turn on the amplifier. Does it still give the error message? If it does, your amp is blown. If it does not, carefully inspect your speaker wires and their connection. Make sure all looks good and reconnect the speakers and try it again. Still get the error message? You likely have a problem in your speaker cabinet(s).

Apr 21, 2009 | Onkyo HTR500 Receiver

1 Answer

MPA-101 Amplifier powers on, receives source signal, the fuse is not blown inside, but no sound comes out of the amplifier. The amp is pretty new, doesn't even have dust inside the unit.


Hello, is this a Radio Shack PA amp or Jamo amp? The unit is probably in "Protect" mode. Is this a PA system or a receiver...receivers have a protection circuit that will not let the speaker relay activate if the amplifier output section is shorted and sending voltage towards the speakers...so they won't fry!!The speaker relay should activate within 3 to 5 seconds if your output section is ok.

barneyluc

Oct 13, 2008 | Audio & Video Receivers

1 Answer

Onkyo TX-NR905 Protection Circuit Activated


The problem is not with the inputs. This unit is in protect because a problem has been detected in the output section. Try disconnecting the speaker wires and turning it on. If the unit remains on, there is a short in one of the speaker wires. If the unit still shuts down, there is an internal problem that will require repair. It sounds like this is a new piece. If so, it should be covered under warranty.

Keep us posted,
Dan

Jul 28, 2008 | Onkyo TX-NR905 Receiver

1 Answer

Tx-sr500 receiver


Hi,your fears are confirmed... the protection circuit is self resetting, and is operating because the amp will most probably have blown that channel as a result of the speaker wire short. At the risk of doing more damage(in the workshop,we always soft start an amp with output problems to prevent more damage)you could take the lid off, check and replace any blown fuses, be sure to use the same rating and type. If the problem persists, or the fuses fail again, it needs some expert attention. Off to the repair shop.... Good luck, and thanks for checking with FixYa

Feb 16, 2008 | Onkyo TX-SR500 Receiver

1 Answer

Avr 3806 power shuts off when volume turned up


Hello david 420

It looks like your receiver's high-speed protection circuit is being activated. It is definitively not a fuse. When a fuse pops, you have to physically replace it. When the protection circuit is activated, the speaker output is cut off and the power supply indicator flashes. There are a few reasons why this happens:

1.- Your speaker wire connections are loose. Whether they are banana plugs or bare wire ends, make sure the speaker terminals on the back of your receiver are tight using clockwise turning.
2.- Verify that your speakers have an impedance between 6 and 16 ohms. Your receiver was designed to work with that impedance range. Any impedance lower than 6 ohms will activate the protection circuitry.
3.- The receiver is used at high volume levels over a long period, which results in an
extreme temperature rise. Improving the ventilation conditions around the unit might help alleviate the problem.

If after complying with these suggestions, problem is still present, you might need to have the unit checked by a professional for possible circuit failure.
Hope this helps. Let me know.

cancerags

Dec 31, 2007 | Denon AVR-3806 Receiver

1 Answer

Shuts off everytime i turn it up pass 4.


Speaker wire contact with each other is the problem. Check the back of ALL SIX speakers including sub-woofer. You should find wires contacting each other. Fix that and your problem will be solved.

Barry Scholles
Strasburg, OH

Sep 04, 2007 | Yamaha HTR-5240 Receiver

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