Question about Onkyo TX-SV525 Receiver

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Reads PROTECT on the display of my Onkyo TX-SV525 ???

I have traced the amplifier circuit and found one shorted final transistor with a burned resistor associated with the transistor.The bad transistor was the left rear channel.I replaced both rear channel transistors with a new matched set and the burned resistor.I found no other problems in the circuit.I powered it up and the display reads PROTECT,with no output.I have a service manual,but I can find nothing about the protection circuit....

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  • hggjyhg Nov 09, 2007

    how do you fix it

  • Anonymous Mar 16, 2014

    My Onkyo TX-SV525 power cord is missing. Where can I find replacement? Anyone got that part?



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Posted on Oct 23, 2007


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1 Answer

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Your unit is going into protect mode. More than likely because you have a bad channel. Take a DVM on diode check and test all off your outputs. Once you find the pair that is shorted, you will need to replace both outputs and all of the transistors in that circuit. You will also need to check your low ohm resistors in that circuit as well as your duel emmiter resistor.

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The manual is here:

Power it OFF before handling any wiring.

You could verify if any speaker wires being shorted is the problem by just disconnecting all of them and trying to power it up. If it fails to power up, it's sick and needs a hands-on tech to look at it.

If you don't actually SEE the problem while disconnecting the speakers, but the receiver DOES come on, try reattaching one at a time until you either have found the offending speaker/wire combination or you have success in turning it on and using it.

Speakers can be shorted, too. So if you locate a channel giving you trouble, say, front right, you could swap a different speaker or wire set into its place to prove if it's external or internal to the receiver.

Going forward, make sure you don't run the unit too loudly and give it plenty of room for cooling ventilation.

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Does it display any message like "Protect" or something similar? Do you hear a relay click on then off?

Did the amp just not power up one day or did it stop working while you were listening to it? Finally, do you have teenage kids who might have been listening to your receiver and would have "neglected" to tell you that after listening to their music it suddenly stopped working?

It could be an internal fuse but chances are its something that requires a technician to repair (like the output transistors).

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