Question about Sony STR-DE425 Receiver

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I have this unit but after i put the volume high

Please need help.
Any one knows what cause the Reciver turns to (Protect) when you raise the volume up?

Please help

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Posibly bad speaker. How many speaers are you running on this receiver?

Posted on Jun 01, 2008

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My stereo sysytem is a mini stereo: serial number 10200055. It currently says "protect", what is this and how do we return our system to normal operations?


Hi there,

When the word PROTECT appears on this display, this means the unit has detected a critical fault which could potentially cause harm to your stereo system.

The most common cause is a short circuit somewhere - something even as simple as loose speaker wiring could cause a short, triggering the Protect message.

You will need to determine if there is a possible short somewhere, so I recommend you start by firstly turning power OFF, disconnecting all speaker wires, then turn unit back ON.

Operate the stereo (without speakers) and turn volume up:
  • If Protect message appears when turning volume up, then stereo unit itself has an internal fault
  • If no Protect message appears, then suspect the speakers may be causing the issue.
  • Reduce volume and turn unit OFF
Re-connect speakers (ensure the connections are secure), turn unit ON:
  • If turning volume up triggers the Protect message again, there is an issue with the speakers or connections

Hope this helps.....

Sep 04, 2011 | Kenwood Audio & Video Receivers

1 Answer

My problem is that when turn the volume up so high it flashes over load and shuts off and the fan on the back of the reciver constly runs is the fan susposed to blow in the reciver or out of the reciver...


Fans usually blow in the direction that would assist warm air to exit the device. Since heated air rises and there are vents on top I would guess air would be drawn in.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Aug 14, 2011 | Technics SA-DX940

1 Answer

Hey i have recently bought a yamaha reciver rx-767 and i wierd up my speakers and after about 5 min at a normal volyme the reciver gets verry hot and turns itself off is there a saftey switch you can turn...


remove the speaker wires all together,, and turn the unit on at a high range of volume,, and wait 10 minutes, if it shuts down then, you have a circuit problem that will need to be checked by a shop, if it stays on, turn the unit off, and add one speaker at a time, following the same procedure, that will let you know which output transistor is bad,, when the unit gets feedback , its going to shut down,

Aug 05, 2011 | Audio & Video Receivers

1 Answer

My reciver keeps shuting off and saying protect when nothing conected to the reciver and it was playing music perfectly at low volume setting and then cut off


The Amplifier has a Fault and is shutting down to protect itself. Repeated cycling of this will cause a total failure in the Amplifier.

If you haven't got the Technical ability to have a look at it yourself then I suggest you take it to a service engineer or wait for a total failure and scrap it.

Jun 04, 2011 | Sony STR-DG520 Receiver

1 Answer

Yamaha RX-797 shuts down when playing at low volume while increasing the volume. If you lower the input wolume from the source into the reciver you can increase the volume on the reciver but when you reach...


That would be consistent with reaching an overload threshold on the amplifier's outputs.

This is mostly boilerplate but it may lead you to the problem...

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

Apr 20, 2011 | Yamaha RX-797 Receiver

1 Answer

Need help


Have you connected an extra pair of speakers?. (Thereby loading the amp stage beyond it's capacity)
Are the speakers connected to the unit the original ones the system came with or different? ( Speaker impedance, usually displayed at the back of the speaker cabinet must not be less than amp's specifications....6 ohms, 8 ohms)
If you're driving the unit excessively you're lucky this piece is equipped with protect mode, else your speakers and amp would have been fried by now.
One last possibility comes to mind: High volume causes vibration causing loosely fitted mains plug to rattle in wall socket calling "protect" due to improper feed voltage. Move the unit to another wall socket and ensure a tight fit into mains receptacle.

May 20, 2008 | Sony STR-DE197 Receiver

1 Answer

Protect keep showing in screen


Theres a few things that can cause that. The protection on the reciver means that a wire is crossing somewhere or it can mean the unit is over heating. replace wires and find you 2 speakers to just test to see if you have a bad coil in your speakers. Replace the wires even if they seem to look ok they might not be. If that fails, the unit could have a problem causing grounding or over heating.

Jan 01, 2008 | Accurian AVR-5048 Receiver

4 Answers

Amp switches off at about -10db volume level


I suppose that on all speakers connections + (positive) is on +, and - (negative) is on - ?

Oct 08, 2007 | Yamaha HTR-5830 Receiver

1 Answer

Harmon kardon stereo reciever avr130


Say PLEASE!!!! LOL just pullin your leg. I have found most reciver remotes are a B&*&h to work with as well as program for other componets. Now for yor problem at hand. It could be a speaker partially shorted and on a high current such as a loud input to the speaker its loading down the reciver. Also could be a fault with the idle current or zero offset voltage, or an Idle bias alighnment, or fault in the recivers amp section. The only way to test this amp would be have a service tech hook up the amp. to some load resistors, hook it up to a scope, and insert an 400 cycle to 1000 cycle tone at .775 Millivolt and see when the outputs clip if at all, and this will tell an experienced tech where to look for the problem you describe. You see my freind there are no user serviceable parts inside this reciver for you to trouble shoot unless you know how to use specialized equipment and troubleshoot solid state electronics. Good Luck

Jul 01, 2006 | Harman Kardon AVR 130 Receiver

1 Answer

JVC RX-7000V


As per the instruction manual the overload is there because of high volume condidtions and your over heating the unit. They recomend to turn down the volume shut off the reciver wait a few minutes and turn back on the unit with lower volumes. Second it states that the peaker wires or speakers could be shorted so make sure the speakers are good and the wires when you connected them to the reciver are not shorted. If all is hooked up properly then you have a problem in the output stage of the amp and its gonna need service unless you know how to replace the defective output devices? If not Go online at the addy I give you to find about service parts or service manuals.. Good Luck http://www.jvcservice.com

Apr 23, 2006 | JVC RX-7000V Receiver

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