Question about NAD C 275BEE 2Channel Amplifier
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Posted on Jan 02, 2017
If swapping of left and right input sources and left and right speakers does not help...you might have a bad channel in your amp.
Posted on Sep 25, 2008
Just came accross your post accidentically, while reparing my own C320BEE. May be it 's too late for you now, but it could help others: I had the very same symptoms as you described and after a long search found out that the trouble was R45 in one of the 18V regulators. (R45: 33 ohms 1/2W fuse resistor, situated more or less half-way between the two "metal towers" on the main board. Replace by a somewhat stronger type 1W or so.
Posted on Jul 06, 2010
Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
Check for loose speaker connections at the speaker as a root cause for ntermittent shutdown.
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Posted on May 27, 2011
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