Question about Sony STR-DE575 Receiver

2 Answers

Unit going into protection mode

Hi, I just joined, and the story of my problem seems similar to a few others I've just read here. I've had my Sony DE575 for about 4 years now with absolutely no problems. However, it's not a constant, but very often lately, while playing from any one of several different sources (CD, DVD, TV) once a certain volume level is reached the unit goes into "protection" mode and shuts itself down. Due to a change in address I recently had to move & re-connect the unit for the first time, but everything seems to be connected properly & the speakers seem to be in phase. Previously the unit had 2 acoustic research and 2 Bose bookshelf speakers. Now the speakers are 4 Bose bookshelves, with a Optimus center channel speaker. There is no subwoofer. I tried lowering the bass response levels on the EQ, thinking perhaps the it was driving it too hard, but it didnt make a difference. The volume level at which the unit shuts down seems to vary, but I used to be able to have the volume at basically any level and the unit has never previously had this problem. And there's nothing in the manual at all about the "protect" warning that appears. Any ideas, advice anybody could give would be great! Please let me know if you need any additional information. Thanks! Bill Cairns

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  • BigRun Dec 26, 2007

    My system with the same AV receiver will go to "protect mode" only after generating a loud noise. I have double and triple checked all the speaker connections, routed all power cords away from speaker wires and yet the "feedback noise" continues intermittenly then into the protect mode. This problem did not start until we moved last February. The problem occurs in all audio selections (DVD, CD, TV) and volume levels. The only difference in the current layout versus the previous equipemnt layout is now the powered subwoofer is between the left front speaker and the TV?Equipment stand. My next move is to by pass the sub-woofer.



2 Answers

With the shuting off of the player if u have any type of feed back from wireing or elect proble it will shut off

Posted on Dec 25, 2007

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You should first have or check the impedance and resistance of the speakers. then if all the speakers and wiring checks good, the only way to tell if this unit is good or the output section has no problems, is to hook up load resistors to where the speakers go, insert 400 to 1000 hz @.775MV into an input, hook up an osilliscope to the load resistors and slowly turn up the volume and see if the waveform clips before it shuts down. I doubt if you will have the equipment to preform these test but a good repair shop will be able to help you out. If it does not clip or go out then its all speaker wiring and/or the speakers.

Posted on Oct 04, 2006


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1 Answer

My sony str db790 is in protect mode, i have disconnected all the speakers and when i turn it on it goes in to protect mode again. i have connected back 2 speakers that i know have no faults and still it...

Hi Kevin, This may not be a solution but you`ve most likely burnt out the amplifiers, I have the same model and its just burnt out the amplifiers for the second time. I was`nt cranking the volume and it was running my Bose AM 5`s which are very good speakers.Its expensive to repair and not many tech heads will take on anything "Sony". If you do have any luck fixing it please get in touch. ** Regards, Neil.

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I have an Yamaha RXV440. It goes into protection mode instantly.

The Yamaha repair shop evidently couldn't find the failed component(s) and/or cold solder joints causing it to go into protection mode. Sony equipment has similar problems related to protection mode.

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"Protector" error

I had a similar problem and went to Sony tech support.

Seemed my disc got stuck somehow...

Try reseting the system by holding the STOP and the EJECT and the POWER buttons together...
It should go to demo mode....

Then try PLAY to see if you can get the system to read teh disc...
then EJECT...

It took me several trys of doing this but it did work....on the 3rd try.

Aug 03, 2009 | Sony DAVHDX265 System

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When iturn on my Sony STR-DE325 it goes into protect mode

Try disconnecting all of your speakers, and then turn on you unit. If you have a defective speaker, or a short in your wires, your unit will go into protect mode. If your unit seems ok with the speakers disconnected, then turn unit off, hook up one of the speaker leads and try it. This way you can isolate the problem.......

Good Luck,


Jul 09, 2009 | Sony STR-DE325 Receiver

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Protection mode

It's normal for some amps to go into protect for a few seconds when initially powered up. If it remains in protect mode, it may have shorted output transistors. To eliminate other possible causes, read through the following troubleshooting page:

Amp in Protect Mode - Troubleshooting

Let me know if you have any other questions.

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Protect Mode With Sony str-de595

Hi snark63

Ypou have an intermittent problem that sounds to be heat related... the more work the amp does, the more heat generated by the output stages. This will be aggravating some poor solder joints that are cracked or dry. The unit needs some repair work done in these areas. If you have good experience with a soldering iron, the cure for this is to resolder the power stages of the unit, or any other solder joints that look to be failing.

I am more than happy to answer any other questions you may have about it, please get back to me here, or use the ASK function to go straight to me :) If you are still unsure, have problems, or we need to look at the situation more deeply, then before you give a rating for this advice, hit the ASK button Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

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2 Answers

Blinking Protect Mode

You are right! There's a good chance you BLEW IT UP, so to speak! But there is hope... [Note: There are no fuses on this unit, inside or out. There IS, however, an internal overload protection system designed to prevent permanent damage. With no disrespect Sony, it is not a very ample system. That is, it simply doesn't do its job very well. However, there is a CHANCE a reputable service center can reset it, but don't get your hopes up.] But before you take it in for service, it is also a REMOTE possibility you will get lucky doing one of the following: FIRST, what happens when you DISCONNECT ALL OF THE SPEAKERS? Does it still go into Protect mode? (If it does, it's time for service.) If not, then you might simply have a bad speaker (rare); a shorted wire; or improper speaker impedence: The NEXT STEP, then, is to make certain ALL of your speakers have an IMPEDENCE of 8 OHMS. Virtually all speakers of even modest quality will include this specification on a label on the back of the speaker. You CANNOT run more than (2) TWO speakers with 4 OHMs impedence on ANY amplifier (technical discussion too long!) Finally, in switching your speakers around for the party, and then again afterwards, you may have crossed a wire; ran a staple through one; or have bare wires touching at one (or more) of the speakers. Check first for bare wires touching one another. This would put your Sony into Protect mode the instant you turn it on. If everything looks okay at the speakers, then reconnect them to the receiver, and test them ONE AT A TIME. For example, reconnect the left front speaker, test the system; THEN add the right front, test the system, and so on, ADDING one more speaker each time - FIRST MAKING SURE EACH OF THEM HAS AN IMPEDENCE OF AT LEAST 8 OHMS! IF there is a short (or bad speaker) this will help isolate it. Assuming the unit powers-up without speakers, then one of these simple fixes might prove worthwhile! GOOD LUCK!

Jul 07, 2007 | Sony STR-DE325 Receiver

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