Question about Sony STR-DE595 5-Channel Amplifier

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The SONY STR DE595 goes into "protect" mode upon turning it on.I recut all speaker wires & vacuumed the receiver ...unplugged,differenet outlets...etc.Any advice?

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  • Sony Master
  • 5,113 Answers

The protect thing is to do with an overload. It's more than likely that something in the main amp section has failed (perhaps a transistor on the big heat sink). The cause often speaker wiring touching together. You should look carefully at the this section for damage or burning. If you have a ohm meter you can test the transistors. If you place the probes on the terminals of each transistor and you get a responce like you had touch the probes together, you have located the source of the overload.

Posted on Sep 04, 2010

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Posted on Jan 02, 2017

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My Sony str de335 is in protection mode speakers are unhooked how do I get it out of protection mode?


if you disconnected everything and it still goes into protect, the most likely there is a damaged amp channel that will need to be repaired.

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I can't get sound out of my amplifier and I haven't changed anything. What could be the problem?


Start by choosing FM on a known frequency with a station broadcasting and volume is turned down to a NORMAL listening level. Next, make sure speaker selector isn't the wrong position (make sure "SPEAKERS OFF/A/B/A+B is set to A [or B to match the speaker terminal connections]), check to be sure "Mute" function is not activated by pressing the MUTE button on the remote to toggle it between on & off, Make sure headphones are disconnected. Make sure "PROTECT" is not displayed on the front as this indicates a shorted speaker wire - shut off and repair the shorted wire(s).

If you get sound on FM, but have an issue with another external component (CD, DVD, Phono, etc.) check the cables between the component and the input panel on the rear of the STR-DE595.

I hope this helps & good luck!

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I have a Sony STR-DE 597 reciever. I have been using it fine for a few years with no problems and it sounded great. I turn the unit on recently and a message was displayed on the unit that said PROTECT....


Protect will usually show up if the receiver was turned up too loud to the point where the speakers will crackle, the receiver will switch to protect to not damage anything. Unplug it for about 30 seconds and check all the audio wiring in the back to make sure everything is plugged in good and tight and no loose cables or stray pieces of copper audio wire and plug it back in.

Aug 21, 2011 | Sony STR-DE595 Receiver

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When I switch my amp on it goes to protect and switch itself off


Check for shorts in the speaker lines.The easiest way to do this is to disconnect all the speaker lines from the amp. Now, turn it on and see if it goes into protect. If it does,that tells you that the problem is in the amp.
If it doesn't go into protect, reconnect the speaker lines one at a time until you find one(or more) that shuts the amp down. That would be your short.

Jan 20, 2011 | Sony STR-DE595 5-Channel Amplifier

1 Answer

This amp wwhen turned on, dosplays 'PROTECTOR' on teh display, what is this telling me?


Disconnect all the speakers and unplug it for 5 minutes. Then turn it back on without any speakers plugged in. If it doesn't say protector, then you either have a shorted out speaker or wire. The amp is in protection mode which is designed to keep it from burning up. If it still says protection, then it will need to be repaired as it is too late.

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Question about Sony STR-DE595


NO! It uses the same amps for a and b channels. and you could short it out if its wirer improperly.

Dec 17, 2009 | Sony STR-DE595 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,

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Goes into protect mode..


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go into the speaker setup menu and turn subwoofer to YES

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