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Protect in dispaly

Whenever i turn on my radio the word protect comes up and the radio goes off. how do i fix this?

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  • medbiz Dec 20, 2007

    My system switches off and displays "Protect" when I have the CD play at a volume higher then 18.

    Any help appreciated

  • sebasrojas4 Dec 19, 2008

    i have the same problem... protect appears in my screen if i turn the volume up higher than 18



1 Answer

The word PROTECT displays when I plug it the unit. How do I fix it?

Posted on Feb 03, 2008


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I have owned an NAD 705 Receiver for many years, and am just now having problems (probably over 20 years old). I'm getting a message on the screen of the receiver that says 'protection' .

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My stereo won't work. Whenever I try to turn it on, it always turns off saying "protect." How can I fix this?

The protect has come on because it senses an output load problem, Turn the unit off, unhook the speakers and wires from the stereo, now turn the unit on and turn the volume down as far as it will go, this should reset the processor ic, if the word protect stays off you have a short in the wiring or bad speaker. If the protect comes back on with everything unhooked the problem is in the audio output ic pack in the stereo and will require a technician to remedy.

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No power to radio wont even turn on

The most likely thing is what we techs call revers polarity. this means that the customer accedently hook up the power in reverse. this happens more often then not. The fix for this is to replace the 1 amp diode that goes between the negative and positive power input on the board. the Diode number is a 1N4007 or any 1amp silicone diode. You will also see that once Blown diode is cut the radio will come back on. this does not mean the radio is fixed what this means is that the shorted diode has been removed from the circuit. which also means the radio has nom protection until the diode is replaced.

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This problem is internal and needs to be sent back to where you got it...use your warrenty.

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I ran across this problem before, the only solution the guy found was resetting the receiver, here''s how to do it:

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