Question about Onkyo SKS-HT500 System

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Power shuts off immediatly after power on

The power shuts off immediatly after power on. The troubleshooting guide says the amplifier protection circuitry has been activated. Is there a way I can reset this.

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  • blootzm3 Nov 25, 2007

    if i turn my sub up the house power shuts off and i have to go to the breakers to flip it back on. i like my loud bass but theirs no t enough power to power it. how do i fix this.

  • james4659 May 29, 2008

    when i turn my onkyo-htr500 on it shuts down immediatly

  • pruthvisb Feb 06, 2009

    I have the same problem. How to fix this?

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You may have to many electronics plugged up to one circuit in your house. try plugging the sound system into a different socket and that might help.

Posted on Dec 30, 2007

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1 Answer

Powers on then immediatly shuts off


Sounds like your missing your power control wire that activates it threw the radio. When you turn the radio on a hot wire activates and runs to the amp turning it on. Search for it.Remember to rate my solution this is how i earn my achievements also testimonial Thanks much in advance.

Apr 22, 2012 | Audio Players & Recorders

1 Answer

I have an Onkyo TX-SR500. I turn it on, and immediately it shuts off. Under troubleshooting it says, "activated amplifier protection circuitry". Here is my issue: I've called Onkyo USA...


No one would be able to troubleshoot it over the phone or internet. Take it to a reputable shop and get an estimate, then decide if it's worth the cost.

May 17, 2011 | Onkyo TX-SR500 Receiver

1 Answer

This site said it was free - then there is a charge? I am getting a "Protecting" message when I turn on my receiver - then it shuts off....What does this mean and what should I do?


It means the receiver senses excessive heat, or a short at its outputs. Disconnect the speaker wires and see if that helps. If not, get it to a Tech. If it turns on, figure out which speaker path(s) was causing the problem and resolve it.

The manual.

http://www.retrevo.com/support/Onkyo-TX-SR601-Receivers-manual/id/365ag212/t/2/

Power shuts off immediately after power on.

• Amplifier protection circuitry is activated. Remove the power cord from the outlet immediately. Contact your Onkyo service center.

Jan 13, 2011 | Onkyo TX-SR601 Receiver

1 Answer

No sound coming with protection light on


It's either overheated or you may have faulty speaker wiring or a shorted speaker. These directions come from a Samson servo 120a but the theory is the same.

The following conditions will cause the Protection LED to go on:

Initial power-up: For approximately five seconds after initial power-up, the relay

speaker connection circuitry is deactivated and the speaker output is muted. If everything is operating normally, you will hear an audible click at the conclusion of this brief period, as the circuitry is activated and the Servo 120a begins delivering signal to connected speakers (at which point the Speaker LED will light if the Speaker on/off switch is in its "in" position). It is normal for the Protection LED to fade gradually after the amplifier is powered off.

Overheating: A temperature sensing device in the Servo 120a will cause the relay speaker connection circuitry to be activated (and the Protection LED to go on) whenever the operating temperature of the unit rises above a safe level. To guard against this problem, make sure the Servo 120a receives adequate ventilation on all sides ; in extreme environmental conditions, you may also

want to consider the use of cooling fans.

Severe overcurrent conditions: This occurs whenever the signal being output

from the Servo 120a rises to a level above 20% THD (Total Harmonic Distortion).

Shorted speaker cables: This will occur if, due to faulty wiring, the hot and ground signals being output by the Servo 120a short to one another.

Output impedance drops below 2 ohms: This can occur if the Servo 120a is connected to inappropriate speaker systems (see the "Setting Up and Using the Servo 120a" section in this manual for more information).

DC voltage detected at speaker output: The most likely cause of this is an internal failure. In general, any time the Protection LED lights up (other than during the approximately five seconds following initial power-up), there is reason to be concerned. If this occurs, turn the Servo 120a off immediately and carefully check all wiring and external devices in order to locate and correct the condition that caused the LED to light up in the first place.

Dec 27, 2010 | Samson Servo 170 Amplifier

1 Answer

What does it mean when the red protection light illuminates


Hi the protection light comes on when there is a problem within the amps. circuitry. Generally speaking the protection light normally comes on when powered up while the amp checks all of its voltage rails so that they all lie within a specific tolerance, when all have been verified to be in spec. then the protect light goes out & the power light comes on. If the protect light stays on then a fault exists within it's circuitry. Cheers, acbva.

Nov 14, 2009 | Sony Xplod Car Audio Amplifier XM-DS1300P5...

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

Power light kicks on then off when I turn on the stereo


The amplifier likely has shorted output transistors. To confirm that it's not some other fault, go to the following page. It will guide you through the troubleshooting.

Troubleshooting - Amp Going into Protect

Let me know if you have any other questions.

Jul 20, 2008 | Pioneer GM-5300T Car Audio Amplifier

2 Answers

500.1 amp power lights blinks on and off


Protection mode; follow this link to get a manual for the amplifier: http://mobile.jlaudio.com/products_amps.php?amp_id=439

Below information is from the manual:

Status Indicator Lights / Protection Circuitry
There are three status indicator lights on the top of the amplifier. These are as follows:1) "Power" (Green): lights to indicate that the amplifier is turned on and operating normally.
2) "Thermal" (Red): lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-protection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal, full-power operating mode if the heat sink temperature drops back to a safe level.
3) "Low ω" (Amber): lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum impedance load range for the amplifier. When this light is on, a protection circuit engages and reduces the power output of the amplifier. The amber indicator will also light when a short-circuit is detected in the speaker wiring (this can be a short between the positive and negative speaker wires or between either speaker wire and the vehicle chassis).
There is only one condition that will shut down an undamaged 500/1v2 completely… If battery voltage drops below 10 volts, the entire amplifier will shut itself off. The green "Power" indicator on the top of the amplifier will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 10 volts. This may happen in a rapid cycle when bass-heavy program material causes a weak charging system to dip below 10 volts momentarily. If this is happening in your system, have your charging system inspected to make sure it is working properly.
For information on troubleshooting this amplifier, refer to Appendix E (page 21).

Jun 25, 2008 | Jl Audio E1200 Car Audio Amplifier

1 Answer

Amplifier protection circuitry


more than likely blown amp transistors on 1 or more channels. use an ohm meter to check resistance of the transistors.

Nov 14, 2007 | Onkyo HTR500 Receiver

2 Answers

Amp keeps turning itself down - cant turn off 'protection'


yes,pls.stop plugging the system,you may harm your system if you do so,the system has it's own system analysis mode,and if there's something wrong in the circuitry,it will activate,you need the authorize service center my friend,it's a technical problem.

Dec 09, 2006 | Cambridge Audio Azur 540A Amplifier

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