Question about Onkyo TX-SR500 Receiver

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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 and they just say, unplug all the speakers and try turning it on (as if I haven't tried that). Then they refer me to the local service center in Denver (DTR technologies) which won't diagnose anything on the phone, and mandates that I ship it to them, and between shipping, diagnostics, and labor costs it will be $300!!! The receiver is somewhat old, was working perfect under it went to protect itself, and now they want me to shell out big $ to fix it. Does anyone understand how to fix the amplifier circuitry protection mechanism?? What is Onkyo going to charge- me 300 to do? Any ideas? If this is a common troubleshoot, why is there no easy fix? Any help would be great, thanks! I am not upset at Fixya, just Onkyo and the way their service is setup.

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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.

Posted on May 18, 2011

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My TX-SR500 has a problem, when I turned it on it will o less than a second and turns off it's self and the standby lithgt is blinking... Please help me on my onkyo. thank you very much!


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on; or it may turn on but produce no audio to the speakers.

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 'nekkid'. 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.

Sep 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

Our receiver is showing "PROTECT",


Shut it off, and check the speaker connections. Look for a thin strand of wire shorting the terminals both at the rear of the receiver AND each of the speakers. Next, look for damaged speaker wires. Those run under rugs can be damaged without knowing as they're covered. Look along the entire length of the speaker wires for missing insulation and shorted conductors. Replace any wire that has damaged insulation and try again. Correct any blown speaker fuses or tripped resets (if equipped).

If the receiver still shows "protect" it will probably need to be serviced due to a failed power transistor. A damaged wire that allows a short can cause this - and typically the amplifier will go into protect mode under this condition. If allowed to persist for very long or at loud volumes, permanent damage can result. Sometimes it works one moment and then seemingly fails with this message "out of the blue". Hopefully, you'll find the problem with a wire and it will work as expected again.

Good luck!

Nov 10, 2010 | Onkyo TX-SR500 Receiver

2 Answers

When power button turned on, receiver powers up


I have had the same problem with my new Onkyo HT-S 5305B (A/V Receiver + 5.1 speakers). To solve this, try to follow "Troubleshooting" guide that came with your system. I followed it 2-3 times. In my final attempt, when system was not shutting down but stayed-n with no sound, I played with the setup and tried changing audio adjustment, input, dimension etc. and slowly I was able to get speakers up one after the other. It's working fine now.
However, I am little concerned that why such a high-class Onkyo system failed in less than two days, forcing me to troubleshoot. - Apurva

May 10, 2010 | Onkyo TX-SR500 Receiver

1 Answer

Hi, after i turn the power on and then press the stand-by button, it clicks off to stand-by mode instantly. This is an Onkyo TX-SR500


This indicates that the system is going into protect mode. First disconnect all speaker wires (with the power cable disconnected). Then turn the unit on and see if it sill shuts aff ofter a few seconds. If it does not, then you have a problem with the speakers or speaker wires. inspect the wires at both ends for frayed strands that may touch. If that all lookd good, plu the speakers in, one at a time, until the problem reappears. Be sure to turn the sytem off before plugging in any speaker just to prevent any accidental short which could be catastrophic. If the system goes into protect mode with all speakers disconnected, you probably have a shorted output transistor.

Apr 05, 2010 | Onkyo TX-SR500 Receiver

4 Answers

My Onkyo TX-SR500 receiver stays in standy/on mode.


It may be your amplifier protection circuitry is being activated and shutting down automatically. This is usually caused by a faulty output transistor in one or more of the channels. I recently repaired my Onkyo TX-SR500 which had this problem.
Using a multimeter on ohms check between C and E on each of the ten output transistors. I found Q6051 and Q6061 to be short cct on all pins. Once you have located the faulty channels check the adjacent components for open or short cct.

I replaced the following components,
Q6051 (2SD1047)
Q6061 (2SB817)
R6091 (2.2ohm fusible)
R6081 (2.2ohm fusible)
R6101 2x 0.22ohm 2W
Q6031 (2SD2061)

The amplifier now works perfectly, cost of the parts is about $15-$20.
If you don't feel confident doing this yourself just find a friend or tech who can do it for you.

Jan 11, 2009 | Onkyo TX-SR500 Receiver

1 Answer

Onkyo TX-SR500 5.1 Receiver Last night


1-disconnect subwoofer first and test-and then disconnect surround speakers-and front speaker after-and later center speaker.ever time you disconnect you check the operation until you find the bad one(or two)which make the problem change its cable first and then change speaker itself.if all above failed contact the service center.

Jul 04, 2008 | Onkyo Audio Players & Recorders

2 Answers

No power


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.

May 27, 2008 | Onkyo TX-SR500 Receiver

1 Answer

Onkyo TX-SR500 loosing settings


Turning any receiver off will erase the settings - there is no backup battery (Onkyo uses Battery Free Memory Backup) and the length of time depends on the capacitor charge. Why not just leave the receiver plugged in? Stand-by mode uses a negligible amount of power - enough to keep the capacitors charged and the LED on the front panel on.

Jan 27, 2008 | Onkyo TX-SR500 Receiver

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