Question about Sony STR-DE715 Receiver

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Protect is on after a few seconds.

The outputs are ok.

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If the output are good, Check for a bad/loose ground. Check the solder near the input jacks, and tighten any and all ground screws that hold the circuit boards to the chassis. It could also be a bad transistor in the protection circuit.

Posted on Jan 22, 2009

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The word protector starts flashing a few seconds after the receiver it powered on


It indicates you have an output short circuit.First check if all the speaker cables are all right with no shorting of the wires.Next disconnect all the speakers and try turning it on, if you still get the protect display you have to repair the output stage of the Amplifier.You will have to get professional help for that if you have no experience in electronics.

Aug 23, 2011 | Sony STR-D1015

1 Answer

We have a Marantz sr4500, everytime we put it on it makes a Zzzzzz sound and then it turns off with a loud "buk" sound and shows protect on the amp's screen, after few seconds the amp turns...


It is not so easy to probe into to find a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.In this case I think that some capacitors are faulty as when the set is put on it charges on to make the amplifier work. Possible fault in the protect circuit or preamp.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

May 11, 2011 | Marantz SR4500 Receiver

1 Answer

I turn on my noise and it says video 1 for a few seconds then keeps saying protect


The receiver has an output load problem, turn the unit off, remove the speakers and wires, now! turn it back on and reduce the volume right down, if the word protect stays off you have a short in the wires or one of the speakers. However! if the word protect comes back on "with the wires and speakers dis-connected" there is a short in one or more of the audio output ic's in the receiver, this will require a technician to troubleshoot the extent of damage and cost involved.

Jan 29, 2011 | Sony STR-DE845 Receiver

1 Answer

Look at inside at capacitor and fuse but they seem ok. again once i turn it on, it would automatically shuts off after a second.


When a system shuts down after a few seconds it is the self protect circuit shutting down power to the outputs to prevent (further) damage. It may be caused by frayed speaker wires, bad speaker voice coils, or blown output transistors. First, turn off power and remove all speaker wires from the receiver. Turn it back on and see if the problem remains. If it works OK, inspect each speaker wire at both ends for loose strands and correct these. Then, hook up your speakers one at a time until the problem reappears. That speaker or its' wiring is your problem. For safety's sake. turn the receiver off before connecting each speaker. An accidental short of the output terminals can be disastrous (and expensive).

Apr 06, 2010 | Yamaha RX-V661 Receiver

1 Answer

It dont turn on. theres red light flashing. is like in protection or something, it last a few seconds and then turn off.thanks for your cooperation


If you have done a reset by holding down speaker a and b buttons while plugging in. Hold buttons for a few seconds then release.If goes back to protect mode then you have a shorted output channel. Most repair shops will charge from 150-200 for repair, there is a lot of parts you have to replace on this model.

Apr 01, 2010 | Denon AVR-1905 Receiver

1 Answer

'clicking' off a few seconds after turned on


Does the receiver work OK?
These are probably electromechanical switches (called relays) which yamaha uses a lot. They use electricity to connect/disconnect something by magnetic force and this causes the "clicks". It is used for example to connect the speakers to the output of apmlifier only after it has finished initializing to protect both the amp and the speakers.
When I turn on my RX-V465 I hear at least one click, it is probably connecting power to the amp. When turning it on with Radio button on remote I hear 3 clicks over 2-3 seconds.
So these clicks are normal and nothing to worry about. They occur also when you switch to the PURE DIRECT mode.

Feb 27, 2010 | Yamaha RX-V463 Receiver

1 Answer

System Protect mode after a Flash fire.


The flash probably was a small resistor burning. While not particualrly common, it does happen. The output transistors are shorted and need to be replaced. If the same channel is bad as the first time, there is a possability that the unit was not completely repaired. Some shops only change the shorted transistor within the transistor pair. This is poor practice and usually leads to another failure of the same channel Check your previous invoice for the parts replaced. The entire complimentary pair of output transistors should have been replaced. If only 1 iof the 2 were replaced, you may have an argument for a warranty repair.

Please keep us posted on your progress.

Dan

Dec 10, 2009 | Onkyo TX-DS838 Receiver

1 Answer

Protect is on


Hi...
Is it LOUD when you first turn it on?
Are the speakers firmly connected at BOTH ends?
If that's all OK then one or both of the output modules in the power amp have failed.
Parts are available

Jan 22, 2009 | Sony STR-DE715 Receiver

1 Answer

Amplifier/receiver switches off systematically after a few second of use


Sounds like a bad output channel is causing it to go into protect mode. Time to see a repair tech.

May 01, 2007 | Harman Kardon HK 3480 Receiver

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