Question about Sony STR-DE525

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Show all time PROTECTER.

My sony str-de525 reciver shows all time PROTECTER. what i do thanks .

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  • Poully Nov 25, 2007

    A speaker on channel "B" fell from wall mount. The wires pulled loose from speaker and possibly touched while unit was playing.

    The receiver cut off and I haven't been able to use it since. The display shows: PROTECTOR I've disconnected all "B" speaker wires from receiver and tried with same results. HEL-L-L-L-LP!!!!!!!!



1 Answer

Got this from another link it may help, I haven't tried it....

The protector indication is always a sign of power problems. The most common of which is the loss of the output transistors in one or all of the audio output amplifiers. These devices go whenever they are overdriven, get too hot or have accidental shorts placed across the speaker terminals.

They are easy to replace if you have soldering skills and know how to identify them and ask the counter person at the local electronic parts store how to match for a replacement.

The equivelant replacement must be the same gender (npn or pnp), same physical package so it will mount on the heat sink, with higher voltage ratings than the original and current. If you can get the SOA or Safe Operating Area spec from the originals, the replacements should be a little higher if possible; that way they won't go again so soon.

I donot have the schematic or service manual for this unit, but you can calculate all the output parameters for the device by knowing the power output ratings of the amplifier into an 8 ohm load. P=E times I or V squared/Rload.

Let me know if I can guide you along the way.


Posted on Dec 01, 2007


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