Question about Sony STR-DE525

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STR-DE525 Blown fuse

Hi y'all ! I've used my sony DE525 amp in a party last week and I think I might have blowned one channel or the power supply.. Here is the story : all the 8 speakers of the place were plugged together to be played in mono with only 1 channel of the amp (I had no choice it was set like that I know its dumb but I couldnt do anything)... The amp was overheating and stopped 3 times in the night showing "protect" but since I had no other amp I continued playing, just dropped the volume a little until later in the night the amp totally stopped... The power supply fuse was burnt so I changed it and now when I plug it the fuse burns without even plugging the amp...
Im not really good with electronics I just want to know if I am able to fix it by myself...
Thanx a lot

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  • Anonymous Jan 05, 2009

    My son has the same receiver and blew a couple fuses several months ago. He was told just to "pitch" the receiver, that it wasn't worth fixing. Hard for a dad to accept, as you can imagine. I just read your last comments to the fella about a similar problem with this same model receiver and sent your website address on to my son. I hope he will write you as it appears you would be able to help him/us resolve this problem. I was really happy to see your website--thanks, andkeep up the good work.

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Not very likely that you can fix it yourself with little electronic skills. You fried the channel you had it connected to. It will require the replacement of a lot of parts in the amplifer circuit. When a channel blows it has several transistors, several resistors, sometimes a couple of diodes and capacitors, and sometimes with the sony amplifers a pre-amp driver IC that will need to be replaced. You will require a multi-meter to determain which parts must be replaced, a soldering iron, some solder, and some solder wick to remove the solder from any bad components that must be replaced.

Any time you connect more than 1 speaker to a channel you risk over-heating that channel and shorting out some components. There are no amplifiers that are designed for more than 1 speaker per channel. I have repaired many sony recievers, including the one you have on several occasions, in the 18 years of working as an audio repair technician. With 2 speakers on the same channel you will draw double the amount of current thru the amp circuit than it was designed for. With 3 speakers on the same channel you will draw triple the amount of current and so on, and so on. I am really surprised that it played for more than just a few seconds with that many speakers on one channel. It must have been in really great shape to start with. I am sorry you did not know this before your party, it would have saved you some money.

Now the good news!

It should be able to be repaired. If all the speakers you had connected were really all on just one channel, you should have only one channel bad. This is a nice receiver as I am sure you must know, since you own it. It is worth getting repaired. As I have stated, I fix these for a living and I would expect the repair cost to be around $125 to $150 if it was taken to the service center that I work at. I can not be certain what another shop would charge, but this is a pretty good estimate considering I do not have it right in front of me to troubleshoot. Some shops are more honest than others, and there is always the chance that there may be more damage than what I would anticipate, or even less damage than I would expect resulting in a cheaper repair.

If you want to take a crack at fixing it yourself I would be happy to guide you thru it, but you would need the proper tools as I stated above.

I hope that you have found this information helpful, and if so, a rating of "FixYa!" would be appropriate and very much appreciated. After all, it is the only reward we get for offering people like yourself this free information and help.

Let me know if you want to try and fix it yourself, or if you have any other questions I can help you with.

Dave

Posted on Sep 16, 2008

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