Question about Sony Str-De575 Stereo Receivers

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Sony STR-DE575 connected to 220V

Hi I am a lucky owner of the Sony STR-DE575 receiver. I bought it in 2004 in the US. However, currently I live in Europe, where obviously we have different voltage. I have been using a proper adapter to convert the voltage.... till the last February. When accidentally I have connected it directly to 220 V. Well, my wife did it, to be more precise. The receiver blinked only, as he wanted to say 'Goodbye'. I have brought it to the repair shop but they told me that since it is a US product the parts that have to be replaced are not available here. They told me that the main circuit board has to be replaced and the standby transformer (I am not sure if I translated those terms correctly). Here come my questions: Do you think it is worth to fix it? Where can I get the mentioned above parts? and what are the proper technical terms describing them? Any kind of help is greatly appreciated. bets regards from Poland Przemek

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  • Sony Master
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Doubt the main pcb needs replacing, but the standby transformer would definitely go in that situation. Standby transformer wouldn't be that expensive, but no way to say that it's the only thing that is bad. It is also soldered in, so you would need to know how to do that to replace it, or bring it to someone who could. If you're staying long-term in Europe, it might just be better to buy something local so as to not run into this problem again.

Posted on Apr 19, 2013

  • Sri Kumar
    Sri Kumar Apr 23, 2016

    I just replied above.. Standby transformer was the problem. So fixed myself and its working fine now. Thanks for ur response..

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It happened to me also. i hooked my STR-DN1050 into 220V which is supposed to support only 120V. being my first big electronic gadget i didnt notice this. so eventually i managed broke my AVR. i have some trouble shooting knowledge so i managed open the cabinet and i saw there's a 125V/8A fuse blown up. so i thought thats a simple fix. so i got 5fuses of 125v/8A from ebay USA. i was unable to find it in india. i replaced it and turned the power on with 120V stepdown transformer. still its not powered.
so i decided the problem is extensive. so i started to deep dive what the standby PWB does. i got a multimeter and checked the voltage at the input of the main transformer, the reading was 0. that means main transformer is not getting the AC voltage.
before the main transformer there's a relay then some other circuits
then an another small transformer. i opened the relay plastic housing with little brakage and looked into it. the relay looked fine.
i checked the voltage input to the relay but there's no voltage to driver the relay. actually this is the relay which drives the AC power to Main transformer. now i tried to manually active the relay, suprisingly the power fed to AVR and showing the display and other things. so its confirmed the all other circuits fine.
now the problem is voltage across the relay. this voltage is given by a small standby transformer. i checked the voltage across the transformer which showed zero. remember i checked the voltage across the transformer directly on the PCB so if there's a short in rectifier circuits then its hard to measure the voltage.
my next step is to check the transformer in open circuit and check the diods. i will update the results. Pls someone guide me on this trouble shooting.
if my standby transformer is faulty where i can get it or what is the alternate idea. i beliive its 120v/5v transformer. if i am unable to get it can i change it with anyother transformers?

Posted on May 29, 2015

  • Sri Kumar
    Sri Kumar Apr 23, 2016

    Guys, oops i forgot to update my problem.
    Good news.. As i mentioned. I desoldered the transformer off the standby PCB and fed 120v power to it to check if there's any output of 9v(required ti drive the relay). Yeah the culprit is that transformer. There's is no output from it. So i tried to but the same part from sony supplier. But those suppliers only supplies to the authorized technicians. So i thought i could rewind the transformer coil or to check any fuse inside the transformer. As i suspected there's a fuse ans which blown up by the high voltage i gave it to audio video technicians and fixed the problem he charged only Rs.220(~4$). Soldered back and boom.... My AVR back to life. Around 8month its working without any problems..

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SOURCE: Sony STR-DE705 question

yes you can use a step down converter,but remember to use a higher rating converter.if your receiver need 100w ( or 1A )then you need a converter at least give 150w ( or 2A ).

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SOURCE: I HAVE A SONY STR-KG700 5.1 SISTEM, AND SOON I`LL

I would just buy a transformer for the unit 220 to 120. That way when you move back your good to go.

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SOURCE: No sound at all when headphones are plugged in

Hi, I apologize in advance for not offering a solution. Have just trolled through the handbook (on-line) for anything that might offer a clue. It takes both high and low impedance units so that's cool. They say to use the phones to assist with speaker issues and there's nothing to suggest that any of the settings affect them. Depending on the impedance the volume levels can change a fair bit so I guess you've cranked it up to check. The fact that they turn off the speakers doesn't add a lot, it can often be a simple mechanical switch in the socket when the plug is inserted. Does the 'speaker off' indicator come on when you plug them in. The only other things I'd suggest is both try another set of phones regardless and the other is reset all the sound settings to factory and see if that has any affect. Else you likely have an issue with the phone interface circuitry.

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palaboy
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SOURCE: Speaker Imedance Matching - Sony STR DE 997 receiver with 120Watts - 8 ohms output with Benz 6 ohms..Tower Speakers

hi pawanh75,

thanks in advance for a very informative setup that you have.

Here are some of possible mods , only if you like and can DIY

( or have someone to help you )


• Using a 6 ohms impedance for an 8 ohm impedance amp clearly

denotes that it heats up the output stages.

(please forgive my very technical words)


• One way to lessen the heat is to install a blower .

Use a 220V blower on top of the receiver.

( air should be in going up direction ).


• Before I proceed further please indicate if having the speaker

connected and having a zero volume , and just letting the receiver

in an "On" state deliverately produce heat on the receiver, or just

when the volume is at medium to high level.


If it s running hot at zero level with speaker , please post.

If it is running hot even without speaker, post also


• It may also helps , if you have a powered subwoofer ( for the low's),

and set settings on your receiver to "small"


Let me know what you find to help you further.





Posted on Sep 12, 2012

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