Question about Sony STR-DE585 Receiver

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"Protect" feature increasingly activated.

My setup has been working fine for the past few years. About 6 months ago, the "protect" feature activated itself (shut off all audio coming from the reciever) at a particularly dynamic part of a DVD we were watching (Lord of the Rings, I think). I shut off the unit and turned it back on, and finished watching the movie wthout any problem. Now, the "protect" feature is becoming increasingly activated, and at levels that are less and less dynamic, to the point where I cannot truly take advantage of DVD audio tracks. The manual only briefly mentions the "protect" feature, and then only in reference to troubleshooting no speaker output when initially setting up the reciever. I have checked all connections and everything is good, plus nothing has changed (no components added or removed) since the problem started. Playing music does not seem to cause the same problem.

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Re: "Protect" feature increasingly activated.

You may have an output transistor gone bad and it is trying to run on one good transistor since they commonly are used in pairs (one positive and one negative). Time for a trip to the shop. Good luck.

Posted on Jan 23, 2007

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My Harmon Kardon AVR 2600 goes to protect mode when powered up. After many tries it will fire up but at times it's up to twenty times. I did load the software upgrade 6 months and it has been fine

Check all speaker wiring for shorts, if okay! there is a problem in the audio output stage of the unit or the protection circuit is not working properly. I would suggest a pro to evaluate.

Apr 02, 2012 | Harman Kardon AVR 2600

1 Answer

Hi My denon AVR-1610, Is less than a year old (in use) i purchased it over a year ago but onl set it up this year. It was working fine and delivers quality sound but for some reason all of a sudden it has...

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 '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.

Check for loose speaker connections at the speaker as another possible root cause forintermittent shutdown.

Jul 11, 2011 | Audio & Video Receivers

1 Answer

What does the word "Protect" mean in the display? My receiver AG-D9100 works great and then quits and the word PROTECT comes up in the display. If I turn it off it usually starts right back up ok...for...

Something is shorting out and tripping a safety feature that protects the amplifier from damage.

try a few simple steps to see if the problem is internal or external.

First make sure that none of the speaker terminals have any loose strands of wire that could be grounding out the terminal and that no wires from the red terminals are touching the component or the black terminals / wires.

secondly disconnect all but one speaker test it to see if t causes the amp to go into protect do so for the other speakers until one trips the protect mode. If one of the speakers is tripping the protect mode it could be a damaged / blown component.

just for fun make sure your speakers are 8 ohms this can be found on the manufacturers website or in your manual. Its rare but some speakers are 4 ohm and they can cause amplifier issues such as tripping a protect mode.

You may have to evaluate the "value" of the receiver and determine if its worth repairing. Many shops will charge a "diagnostic" fee which may be $40 to $80 and remember that parts and an hours labor may not make good financial sense especially if you are talking a unit that is 5+ years old.

Hope this helps

Dec 31, 2009 | Teac AG-D9100 Receiver

2 Answers

Getting out of protect mode I have a Denon 787 receiver. It was working fine for 8 months. All of sudden, my reciever goes into protect mode after playing for about 30 min. Right after it goes into protect...

most of the receivers come with a cooling fan inside see if its working they usually work when you turn the volume up,, if its working that means you are playing it to loud if you lower the volume a little it will play just fine..( if the fan inside is not working thats the reason it goes into protect mode and it means you must have it repaired,, it goes into protect mode to prevent furter damage to the unit or the speakers,,

Dec 18, 2009 | Denon AVR-787

1 Answer


The problem is past that point once the protect continues to activate the amp is in need of service

Feb 25, 2009 | Denon AVR-600 Receiver

1 Answer

Protect error on agv8500

Hi there. I have the same unit. A darn nice piece of hardware. A couple of months back I noticed my cooling fan making noise. A few days ago I got the "PROTECT" message and the unit wouldn't power up. I turned it off for three days and it started playing again. Now I'm pretty sure it went into protect mode because it overheated. I just tried finding a Teac replacement fan and didn't see one on the web. My solution will be to adapt a small computer-type fan onto it to keep things cool. It works too well to let it die! Good Luck, Gborchers. GROGSTER

Nov 15, 2008 | Teac Audio & Video Receivers

1 Answer

Onkyo ts595 goes into protect mode with volume increase

HI check your speaker cables are not touching, also make sure "b" speakers are not on and that all your speakers are 4ohm or higher as this will cause the amp to shut down if they are to low an impedeance,The amp is protecting itself when it shuts down.

hope this helps.

Aug 03, 2008 | Onkyo TX-DS575 Receiver

1 Answer

My samsung HT-TX75 keeps shutting off in a few minutes saying protection.

protection mode activated to protect from serious damage and please follow me.1-shut down your system2-make volume in low position3-remove all your connected speaker4-switch your system on and watch if it does not go to protect mode insert your speaker one by one until you find the bad one and change it and start with cable change first and then speaker itself-if it goes to protect mode you must call service center.

Jul 07, 2008 | Audio & Video Receivers

5 Answers

Sony AM/FM Receiver problem

I had a similar problem with my unit. I found no evidence of a short circuit and after removing the cover no evidence of burns or overheating . I turned the unit on and off repeatedly and eventuaully it started. As I was moving the unit back on its shelf I brushed my ring hand across the top of the unit and the "protect" warning started to flash. It occurred to me there might be a static electricity issue. I hooked up a ground wire as per the manual. Problem solved----at least for the past few weeks. The system has work flawlessly every time I turn it on.

Dec 31, 2007 | Sony STR-DE310

1 Answer

Stuck in protect mode

Speakers shorted out, blew a fuse. Replace the unit or (cross your fingers and) open up the box and find the blown fuse.

Nov 23, 2007 | Sony STR-DE425 Receiver

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