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....

hggjyhg Nov 09, 2007

how do you fix it 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?

1 Answer

Anonymous

HOWDY, NOW YOU COULD TRY THIS ONE: POWER THE RECEIVER UP , THEN PUSH&HOLD !THE VIDEO 1 BUTTON, THEN TURN THE PIECE IN THE OFF (STANDBY MODE ) ,IT WILL SAY "CLEAR SO IT SHOULD BE BACK TO IT,S ORIGINAL FACTORY SPECIFICATION,S.

SUCCES ! AMSTERDAMCOWBOY-HOLLAND-NOW FLORIDA! 4-EVER

Posted on Oct 23, 2007

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My Onkyo TX-SV636 keeps going back to protect mode each time the power is turned on how can I fix this myself

Often amplifiers will display "Protect" if bare speaker wires are touching each other, the back of the amplifier or part of the speaker housing. Check all of the wiring, including any pins/jacks that could have a loose wire. If all of the wiring is good, then the short is internal to the amplifier. See page 44 of the manual available at ManualsLib: https://www.manualslib.com/manual/302316/Onkyo-Tx-Sv636.html?page=44#manual .

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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:

http://www.retrevo.com/s/Onkyo-TX-SV525-Receivers-review-manual/id/365bh226/t/1-2/

Power it OFF before handling any wiring.

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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.

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Hello

maybe you have defective power transistor output and this is shorted, or the problem is in the power section like shorted diode shorted capacitors or open circuit may cause this, and the STK IC if shorted you got protect warning..

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