Question about Sony STR-DE525

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Fuses Columbus, GA Fuses for STR-DE525 Sony Stereo

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Re: Fuses

have you tried to get fuses from maplin electronics.

Posted on Nov 22, 2007

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Why does it say protector

It says 'PROTECT' It has sensed a fault with either the speaker wires shorted or an internal failure. Remove all speaker wires and try again. If it still says protect, then the problem is internal. Service shop repair.

Mar 30, 2010 | Sony STR-DE525

1 Answer

I don't get any front display or any sound when turned on.

Do you hear any clicks? If not, the standby transformer or related circuitry is bad. If you hear 1 relay click...the audio output section is most likely the problem. The first click you hear is the main power relay...and should see display.. the second relay click is the protection circuit relay engaging to let audio to your speakers...if the second click is not heard (it should occur in 3 to 5 seconds) there are shorted output transistors or a shorted output IC trying to blow your speakers with 50 to 75 volts dc. The protection circuit monitors the speaker lines for voltage. They should always read milli-volts only...not even 1 volt.Anyway, good luck

Sep 24, 2009 | Sony STR-DE525

1 Answer


Q558 = 2SA988A
R552 = 120K
R577 = 6K2

Apr 12, 2009 | Sony STR-DE525

2 Answers

Sony str-de525 system "protector" problem

You've blown it. It recognizes a potentally harmful situation and goes into protect mode.

Mar 15, 2009 | Sony STR-DE935

1 Answer

Sony STR-DE525 Protector mode

Download service manual of STR-DE525 here and fix your receiver.
Must download all 4 files at web site.
Need further help, let me know.

Sep 24, 2008 | Sony STR-DE525

2 Answers


nothing is connected at this time no speakers or in puts.....
posible component failure???? any common check points..this thing is pretty webbed with them

Jun 16, 2008 | Sony STR-DE525

1 Answer


check/replace your speaker wires. If a wire came loose, it will go into "protect" mode and shut down, to protect from a short circuit.

Jun 16, 2008 | Sony STR-DE525

1 Answer

Years of good it keeps blowing fuse

The voltage of the fuse is not the issue. It sounds like you may have some blown internal transistors (probably in the output area). Time for a trip to the repair shop I'm afraid.

May 18, 2007 | Sony STR-DE525

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