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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Posted on Jan 02, 2017

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Receiver say's "Protect" or turns on then off posted on Dec 13, 2009
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The most common problem found on FixYa for Audio Video2_bing.gif 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 wire2_bing.gif. 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 speakers2_bing.gif 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 speakers2_bing.gif) 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.

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