Question about Sony STR-DE325 Receiver

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Blinking Protect Mode

Hello I have a 4-5 year old Sony STR-DE325 Receiver. Has been running great. Switched speakers for an outside party and may have cranked it up too high and now starts up, say on tuner, and switches to a blinking "PROTECT" mode. Unplugged it for several days but still goes to PROTECT. Speakers that were switched to, were a smaller amperage than the originals. Checking out the owner's manual I can't seem to find any indication towards a fuse but I suspect there may be one? Thanks, Jiffer

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  • Anonymous Nov 26, 2008

    On my reciver is the same problem when is no speakers conected and no in put conected volume incrased to zero and after 45 sec desplays  a flashing mesage PROTECT  what can i do i have some experinces wit electronic and i wil find that protection circuit and i will smash out any ideas ?



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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!

Posted on Jul 18, 2007

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Hi all i have the same receiver from sony so my story is 
When i turn my receiver on and one off the 4 relay's dont turn on, and the same time on the display is showing
a flashing message " PROTECT" a have tried many times to hok up another speakers of many impendances but nothing no short circuit on the output  and then i decided to open my amp after few hours i find a problem  finaly one off the integrated circuits near the out put transistors the ic was a
upc2581v  (fet driver)  and the problem was a bad soldering can you belive this ? i have soldered the ic again and cut off the long legs from the ic and put together  the amp and is WORK'S  and the amp is made in france i thing you chek this ic in your amp's becuse the soldering off the board is very bad. hi all 

Posted on Nov 26, 2008


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1 Answer

Sony Receiver STR-DE325 is saying protect

If the unit does turn without protect without the speakers,

then you just found the cause.

If the unit is still in protect it needs servicing.

Have a tech to guide you if you need to DIY.

Board level troubleshooting is the next thing to do.

these may take some time, but i do hope youll make it.

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Jan 18, 2011 | Sony STR-DE325 Receiver

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When I turn the unit on it will stay on for a few seconds then goes to protect mode. any ideas?

See page 17.

Disconnect all speakers and see if that helps. Shorted speakers or wiring will cause this. If it still does it a trip to a hands-on tech is called for.

Dec 23, 2010 | Sony STR-DE325 Receiver

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The receiver problem

First thing I'd do is unplug it from the mains and check every speaker connection for short circuits (wires touching) Alternatively, disconnect all speakers and plug in a set of headphones to see if the Protect goes away. Check all components plugged into the receiver by unplugging then one by one. Finally if the Protect is still alight disconnect absolutely everything with the receiver volume control on zero. pull the plug out of the wall and let the receiver sit there for an hour with nothing connected. Then plug it back in plug in your headphones switch the receiver to FM and see what happens. If the protect is still there then I'm afraid the repair shop is your next stop.

BUT check those speaker wires especially if you have puppies or small dogs or believe it or not a small child. They tend to chew on things when teething.

Apr 07, 2010 | Sony STR-DE325 Receiver

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Won't go off protect mode

When the speaker wires shorted to each other, the output transistors for that channel probably shorted as well. This means that the receiver needs repair. The typical parts cost for this usually runs between $20-$40.


Feb 18, 2010 | Sony STR-DE325 Receiver

1 Answer

I turn it on and it says protect and wont play.

That model of receiver goes into protect mode when there is really
resistance or a short on your speakers/wires. It does it to protect the
final drivers in your amp. Does it do the same thing with all of your
speakers disconnected? If it doesn't then you might have a problem with
one of your speakers or wires. Check your wires for shorts in them
first. That may be the only problem. That model is designed for 8 ohm
speakers, but you can go down two 6 ohms safely. I have a STR -D865 that

has been running 6 ohm speakers safely for almost 3 years now. A way to
check your speakers out is to take an ohm-meter across the terminals on
them(with the receiver unhooked). They should read anywhere between 8
and 4 ohms. Check with the manual on your speakers to see if they
correspond. If the resistance is really low, you may have a short in
that speaker. it is also possible that if they are 4 ohm speakers, you
could have damaged the drivers in your receiver. I know the model above
mine, (the 965) has a 4-8 ohm speaker selection switch on the back. The
lower models were not designed to run 4 ohm speakers. Hopefully this has

been of some help.


Jul 18, 2009 | Sony STR-D565 Receiver

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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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Reciever on protect mode

Hold in power button until unit "clicks." Takes about 20 seconds.

Jun 18, 2009 | Sony STR-DE325 Receiver

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Goes into protect mode..

you probly have speaker wires arching. unplug them and replug thm in making sure no bare wire is showing

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I cleaned the contacts on the transistors and it's working great now. Previously, I spilled some drink on the unit and it went into protect mode and it was in the power amp section. It's all up and running again. Thanks for the info. --Steve B.

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