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Audio Systems/NAD 2200 Cuts out at high levels

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Question
Hello,

I have a NAD 2200 that when I use at low levels the amp works perfectly. As soon as I turn up the volume I hear a click, and the amp shuts off and the red light comes on that indicates the unit has gone into protection mode.  If I turn the volume down then the unit comes back on.  You previously answered somebody with the opposite problem (not working at low levels) that:

"The output transistors have a heat transfer silicon grease in between the transistor and the heat sink they are mounted on.   This grease dries out over a few years and the heat transfer is diminished causing the transistors to heat up and kick in the protection cutouts."

Am I encountering a similar issue or is it something completely different?  How difficult will it be for a tech to fix this problem?

Answer
In your case according to the symptom of going into protection mode with no more than a very low output is indicative of a short on the output; either a wire shorting to ground or a speaker with a shorted voice coil.  Check this by removing all speaker connections at the terminals on the back of the amp.  Reconnect them one at a time to see which speaker line is the cause.

Hope that helps.  

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Cleggsan

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Audio Design Engineer; systems, loudspeakers, cd/dvd players, etc. I am knowledgeable in all high end audio equipment and installations. MAKE SURE YOU GIVE A MAKE AND MODEL NUMBER AND CAR IF IT IS AN AUTO QUESTION. Note: I am getting some who ask good questions that take a lot of time to research but then the questioner fails to read the answer. Please don't ask questions unless you are seriously looking for an answer. If you find an answer to your question otherwise then let me know with your reply. Thank you.

Experience

Have been associated with audio design, standards, testing and component systems for over 40 years.

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Life Fellow Member of Audio Engineering Society Life Senior Member of Institute of Electronic and Electrical Engineers

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Review technical manuscripts for IEEE Spectrum Write occasionally for high-end audio publications

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BSEE/MSCS/MBA

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Past Employee/advisor to several well known audio products manufacturers

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