Question about Sony STR-DE545 Receiver

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Protector Upon power-on, Protector flickers on the display. I checked inside, and found no blown fuse. I disconnected all of the cables including speaker wires, but no change.

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If you took all the speakers off the reciver then it still goes into protect, the reciver detects DC on the output lines. That means there is a short in the output stage of the amp. It could be an output device, or a diffencal Transistor. If you can trouble shoot solid state electronics then you should be able to find the faulty, but if not your experienced at electronic repair, am afraid it may cost more then the reciveris worth. Good Luck PS please dont forget to rate this thread

Posted on Oct 23, 2006


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My Nad 2400 wont power up the two fuses look ok?

Troubleshooting depends on what skills and tools you have. Since the fuses are located inside the amp, then I take it you're comfortable with removing the lid and poking around inside.

So, taking the usual mains power safety precautions....

Check that power from the wall socket is getting through to the amp. Use a multimeter to check the mains voltage as it comes in from the power cord. Also check the power is getting through the mains switch and on to the power supply board.

Disconnect the speakers and then power up the amp. If it comes on, then you've probably got either a cabling or speaker issue. Double check by trying the amp volume (no source, no speakers) and ramp it up slowly to 100%. If the amp still stays on then look at your speakers.

Connect one speaker, add a source of music. Power up and check the volume again but to about 1/3rd volume. If the amp cuts out then you found the bad speaker/wiring. If it ran okay then try with the second speaker attached. Repeat as before.

If the amp won't fore up with no speakers attached then something is either worn out or blown inside. Disconnect the live mains feed. Be careful of any capacitors. They will probably be holding charge.

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This indicates that you have a blown output amplifier or shorted speaker wire. Disconnect all the speaker wires and try to turn it on once more. If it shows the same display give it to a service center for repair.

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Try disconnecting all the speakers from the back and turn the unit back on. If the "protector" display goes away, turn the unit back off and reconnect one speaker. Turn it back on and check for "protector". Repeat.

If you find that one of the speakers causes "protector" to appear, you either have a bad speaker cable or bad speaker. Try swapping each of those out to see what happens.

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Well, so far so good. I reinstalled the newly repaired amp and fired it up and so far, so good. Ran it through about an hour of fairly intense break-in tracks and then ran it through about 2 dozen power up and down cycles to try to get it to fail (better now than a month from now and have to fight them on backing it up).

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1 Answer

Protector flashing

Protet mode is a special diagnostic mode that starts when a fault is detected.

When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.

Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.

Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.

If you do all the above and still get Protect, then there is a real fault.

In that case the unit may be disassembled and tested to find the fault.

If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.

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It could be that the player is going into protect mode. This is normally due to a short in a speaker cable, or one or more of your speakers is blown. Try disconnecting all of your speaker cables at the speaker end and make sure the connectors don't touch. Power it up again and see if it stays on. Bear in mind you won't hear anything. If it powers up. Carefully plug each speaker back in. It will power off if you plug in the dud! If it still doesn't power up. disconnect all of your speaker cables at the player end. If it powers up this time one of your cables is shorted. Same as the speakers, plug one pair of wires in at a time to find the dud. If it's still switching off. It could be a blown circuit on the output stage of the amp. Here's a silly question. Does the player get hot? All this assumes that you have had this player working with these cables and speakers before. If not check that the speakers are the correct rating (Resistance in Ohms) for the player. And lastly here's where you can get a manual

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How about the speaker itself? This problem can be caused by a blown or defective speaker. If you disconnect the speaker wires from the amp, do you still get the protect light?

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switch off the amp then take off all the wires off including the speaker wire and then reconnect the wires on like before the problem is that the amp is on protection and if that dont work then get it repaired another thing is make sure ur amp fuses havent blown.

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