Question about Technics SC-DV290 System

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Speaker cut-out I have a Sony receiver and the speakers are at least 20 yrs old. The speakers go in and out, ie., one on, then two on, quite frequently. I've messed with the wires, etc. no results. When I turn up the volume, and then down, the speakers are good for a short time. Help!

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Most likely there is an Ohm Resistance difference between the speakers and what the receiver support. Look at the back of the speakers to see what they are, and look at the back of the receiver and see what it supports. When a receiver is powering a speaker of different ohms, it will do exactly as you described because of Amp confusion. If you really want to use these speakers, there is probably something you can buy at radio shack to put in between the receiver and speakers to lower ohms if speakers are too high rated.

Posted on Apr 28, 2008

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Receiver say's "Protect" or turns on then off


The most common problem found on FixYa for Audio Video Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

on Dec 13, 2009 | Home Theater Systems

1 Answer

On my Sony Surround Sound tuner, if I raise the volume up to a certain level (not that loud), I get a flashing sign ''protect'' and the sound to the speakers are cut.


Sony has protection in these receivers for two main reasons.

1 - Checking for DC voltages on the outputs to speakers. Not your particular problem.

2 - Excessive current being drawn from receiver on one or more of the speakers.

Number 2 should be your starting point in finding a solution. Put the volume level on Medium - 35 to 40 on the front panel. Now listen to all you speakers in turn. Any scratching noise will indicate a defective speaker. Remove this speaker from the receiver output and check again if the set goes into protection on high volume.

If you could not find any strange noises on the speakers, remove them one by one and test the set on high volume.

Never - attempt to disengage the protection on this amplifier. The only times we have found the amplifier to be defective with this protection error, it has done so no matter the volume level. Therefore I believe your problem to be a speaker or speakers.

Good luck!

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I keep getting a messasge that says PROTECT on my Harman/Kardon receiver and then shts off


Disconnect all your speakers at the receiver, then turn the receiver back on. Turn on CD/DVD/Cable etc, then turn up the volume, if it does Not say "protect" you know the problem is in a speaker or a wire. If all goes well, re connect one speaker at a time with the receiver off, then turn on, turn up volume. Repeat until all connected or receiver goes back into protection. Once you find the bad wire/speaker, disconnect the bad wire at the receiver, then reconnect the remaining wires and test again. Now, disconnect the wire at the speaker causing the problem and reconnect it at the receiver. Make sure the wires are separated at the speaker side and; more importantly, cleanly connected at the receiver. If you have any freyed wires at the receiver, cut and strip, then twist the braid neatly. There should only be 1/2" of stripped wire, enough to fit under the terminal when you screw it down. Now, turn on the receiver and test again. If it does not go into protection, reconnect the speaker and test again. If it goes into protection at this point, you know its a speaker problem. If possible, disassemble the speaker to look at the internal wiring, if it looks good, look for a crossover network; this will look like a small printed circuit board. If it's really dusty, use some "dust off" and spray away the dust. look at the circuitry for visible damage, ie. brown or black spots. If you see them, there's your problem and the speaker needs repaired or replaced. To double check, you can meter the speaker for resistance. If your multimeter is digital and says 1..... it's a short. If it analog with a needle, it'll peg to the right. This is a very common problem. Hope this helps

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1 Answer

Lifestyle 30. sound stops, i unplug and plug back in and works for short time and quits. unpllug and plug back and works a short time and quits.


What you describe, sounds like a speaker short. Are you using the Bose wiring with their ends and no cuts in the wire? (splices) It's not too uncommon to extend or shorten a wire. The fastest way to find a short is to disconnect your speakers at the speaker. Be careful to keep the wires separate if they are not on plugs and turn on. If it cuts off (power) or says (protection) on the display that lets you know your speakers are ok and you have a short in the system or a wire. Next, disconnect wires at the sub one by one and test until it causes the system to cut off or short. Leave that speaker disconnected from the sub and test with all others connected. Now you've located the channel that has the problem. First just connect the wire again to the sub. if it cuts out, run a new wire from the sub to the spkr, for testing purposes make it a short wire if possible and test. If you need to use a Bose plug at the sub to test spkrs go buy one at Bose, don't cut your factory wire just yet. If a new plug works then cut and replace. Make sure you use electrical tape not scotch tape or duct tape. If it works fine, test the new plug on the old wire and see if it works. If it does your done, if it doesn't, run a new wire to the speaker with the new plug on it. If after all this and it still doesn't work. Sounds confusing I know, It's just process of elimination, that's how we do it in the field. If all your speakers are disconnected and it still cuts out, it could be the sub or the receiver. Take it to a Bose store and they can check each piece for functionality. If it needs repaired let Bose do it. Hope this helps.

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HI,
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