Question about Onkyo TX-SR503 Receiver

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Amp protection mode

I have a tx srs575 av reciever wen i switch it on it stays for 2 secs n shuts off by itself were the red light flashes.then i tried everything which is posted on this site..bt in vain then i jst gave bang!! on the top cover it worked fine...bt it was fine fr a day then bak to same.. so i reckon its a loose connection...bt i cant find were it is?...any other suggestions?

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Disconnect everything from the amp except the power cord, then power on the amp. If the receiver still shuts down, your problem is inside the case and unless you can perform electronic repair yourself you will probably need to take it in for service. If it does not shut down with nothing connected, power it off, connect one speaker or component and power on again. Repeat the process until the amp shuts down and you may have found the bad speaker or other component.

Posted on Jan 01, 2009

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1 Answer

I have an Onkyo TX-SR506 that does nothing but blink a red light when plugged in. This happened after a power-surge from a lighting storm hit it. Is there any trick or magic key command to get it out of...


Page 90 of the manual describes the procedure for resetting it.

"If you can't resolve the issue yourself, try resetting the AV receiver before contacting your Onkyo dealer.


To reset the AV receiver to its factory defaults, turn it on and, while holding down the [VCR/DVR] button, press the [ON/STANDBY] button. "Clear" will appear on the display and the AV receiver will enter Standby mode.

Note that resetting the AV receiver will delete your radio presets and custom settings."

But that may not help.

Generally speaking, an amp attempts to protect 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 '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.

Aug 31, 2011 | Audio & Video Receivers

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What if went in safety mode, safety mode is froze in screen. Won't do anything


"Safety" mode - literally? I don't see that anywhere in the manual.

Page 13

Speaker Connection Precautions

(North American and Taiwan models) You can connect speakers with an impedance of between 6 and 16 ohms. If you use speakers with a lower impedance, and use the amplifier at high volume levels for a long period of time, the built-in amp protection circuit may be activated.

Page 66

The STANDBY indicator flashes red


The protection circuit has been activated. Remove the power cord from the wall outlet immediately.

Disconnect all speaker cables and input sources, and leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect the power cord and set the volume to maximum. If the AV receiver stays on, set the volume to minimum, disconnect the power cord, and reconnect your speakers and input sources. If the AV receiver turns off when you set the volume to maximum, disconnect the power cord, and contact your Onkyo dealer.

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.

Apr 04, 2011 | Onkyo TX-SR608 Receiver

1 Answer

When I turn on my AV Receiver HT-R520 it shuts down after a few seconds and the standby red light flashes???


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.

Mar 26, 2011 | Onkyo TX-DS777

1 Answer

The reciever won't turn on...the standby light just keeps flashing red.


This can be an indication of protect mode. See the link below for an explanation of protect. If you have any additional questions or wich to attempt a repair yourself, please update this and I'll provide additional information.

Dan

Link: http://www.fixya.com/support/r5390728-protector_means

Dec 02, 2010 | Onkyo TX-SR605 Receiver

1 Answer

Reciever shuts down by itself


Hi, i have similar/same problem, on initial power on, you have after 3 -4 secs an audible click from inside and all is good... if you then try to change inputs either via front panel and or remote, the unit switches off. if you change input prior to audible click, ie within 2-3 secs of power on , all is good and amp works fine, until you change input etc...very painful fault.. i thought it is sensing /checking the speaker outputs and detecting short etc ,so powering off to protect.. but then just my thought, i suspect something else, if anyone has the fix and can repair , please let me know.

Dec 24, 2009 | Yamaha RX-V800 Receiver

1 Answer

Unit only stays on for 4 seconds then turns itself off.


This is a short or unstable ohm load. Remove all speaker wire connections to see if the amp will stay on.
If the problem goes away when disconnecting the speaker wires try this:
1) Check volume level on zone one and zone 2 if connected. If it is too high the amp will go into protect mode and shut off exactly as you described.
2) Make sure no wires are touching any other wire or the metal surface of the amp. This will cause a short and send the amp into protect mode.

Nov 21, 2009 | Denon AVR-1705 Receiver

1 Answer

After turning ON the power/standby switch, the unit(receiver) display comes ON (green light) then after approx.4-5 seconds the display goes OFF and the unit defaults back to the standby mode (red light). I...


Is the red light flashing at first?
The unit may be going into protect mode. Lets hope it has done the job and the receiver has protected itself from failure.
Protect mode can result from speaker wires touching each other or the Amps2_bing.gif metal case. Check that first.
It can also be caused by unstable ohm loads if too many speakers2_bing.gif are connected to any of the outputs especially zone 2.
If you can remove all speaker wires and turn the unit back on. If it stays on, turn the volume down on the main zone and zone 2 if connected. Then reconnect speaker wires.

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1 Answer

The reciever just shuts down


The manual suggests disconnecting inputs and outputs and power, letting it sit for an hour, then plugging it back in and turning volume to max to see if it still shuts off. If it does, the problem is with the unit. If it doesn't, the problem is elsewhere.

Judging from some other sites, this is a common problem. If you take it to a dealer, suggest they check the AC input. Before anything else, make sure that there are no stray wires on your speakers connecting the positive and negative clips, which will cause a short and activate the amp protection.

I had the same problem with an Onky502 and replaced it today with an Onkyo606. It worked fine for an hour then started shutting off automatically. I'm following the manual and letting it cool off now for an hour, and meantime I'll check my speakers.

Dec 30, 2008 | Onkyo TX-DS777

1 Answer

Denon AVR -1905 made a loud popping noise, now doesn't stay on


The output section has smoked and requires repair. The unit is not in "protect" mode. This means that the outputs are turned off to prevent additional damage to either the amp or the speakers. Expect a repair to run from $15-$40 in parts plus the local labor rate.
Dan

Mar 26, 2008 | Denon AVR-1905 Receiver

2 Answers

Flashing protector


Psgolfer ...I pretty shure you dont need that. It just needs to be reset, its in protect mode.....hold the power button down and the A n B speaker buttons down at the same time for 30 sec.....ok , Radricktip

Jan 01, 2008 | Denon AVR-887

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