Question about Bose Lifestyle 48 System

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I appears that the amplifier is not working - no speakers are working and the error message says speakers not connected. Have changed power cord, amp isn't warm. any suggestions? Fuse locations? where to go for reasonable cost repairs? Thanks!!

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I HAVE A BOSE, THE PROBLEM IS AMPLIFIER IS NOT WOR
RKING. I NEED DIAGRAM

Posted on Sep 08, 2010

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1 Answer

I have a pioneer vsx 07 11 and it says amplifier error


You see, the error message is coming from the power protection circuit which is constantly monitoring current being drawn from the receiver power supply. When the current exceeds the trip level it shuts down and give the error message.


power amplifiers has been shorted and the output transistors (one or more) have gone into breakdown and causing the excessive current drain. This will happen even though the speakers may not be connected to the amp outputs.

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The message appears when there's a short at the amplifiers. Disconnect all the speaker cables and try again:
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  - if the message is still there then one of the amplifiers has failed - take to unit to a repair shop, that amplifier must be replaced.

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Sounds like your Gr Caravan has the premium sound package. You likely haven't hurt anything - but you may need to modify the wiring a bit. The speakers have a tweeter speaker in the center of the main speaker and the wiring goes through that. However, it only worked with the premium package. Go in to the speakers and move the wiring connections from the tweeter to the main speaker. Your other option is to replace the speakers.

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I dont know how to set it up. I put the green cord in the computer..but theres one black cord and i dont know what to do with it.


There should be ONE stereo miniplug to be connected to the headphones output of the computer, and one power supply plug to be connected to the AC adapter. These speakers do need a power supply, since they have an internal amplifier.

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Try disconnecting everything (all inputs, outputs and speakers, make sure there is no cable plugged into your unit except the power cord), turn it on, if it still shows the protect message, you have an internal short or a burnt out component inside the unit, possibly a desoldered contact on one of the connectors which generates internal noise of such intensity that it sends the unit into the protect mode.

If, after trying the above mentioned, there's no message, some other possibilities are:

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Hope you cand find something out...

Good luck

3rq8 (Triarcuate)

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1 Answer

Power will not stay on


Activated protection circuitry means that the amplifier is seeing conditions it does not like and is shutting down the power to prevent further damage.
Either you have a short in your speaker wires, in your speakers, or a blown amplifier.
Disconnect both speakers and turn on the amplifier. Does it still give the error message? If it does, your amp is blown. If it does not, carefully inspect your speaker wires and their connection. Make sure all looks good and reconnect the speakers and try it again. Still get the error message? You likely have a problem in your speaker cabinet(s).

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Power protect is an error message that some thing is wrong in your sound system and requires qualified tech.

Normally that error message appears when unit got problem in amplifier output section, either it is speaker problem or some output chip is fried.

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Disconnect the speaker wires from the amp, then try it again. If the error message doesn't appear, try connecting the speaker wires back to the amp one by one.

The error message is due to some sort of overcurrent in the amp. If the error does not go away when the speaker wires are disconnected, the issue is most likely with the amp itself and will need professional repair.

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first check your speaker cabels for short circuit and speaker for  short coil .after you confirm there is no shotr of cabel wires by checking with avometer in ohm postion.connect speaker if the problem excit your speaker is guilty - change it with same configuration.about switches put it in low order and chech for sound level and you can go up after that.

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