Question about NAD C272 Amplifier
My NAD C272 has developed an intermittent fault where the left channel goes completely dead until I give it a good wallop, at which point it returns. It seems to get more reliable when the amplifier has warmed up. So I assumed it was a dry joint or intermittent connection, but when I took the back off I was unable to replicate the fault. Its not the pre-amp or source components, because the problem stays on the left speaker when I swap the amplifier inputs over. I've replaced the cables with no effect. Has anyone seen similar problems? Do you know where I can get hold of a technical manual?
Thanks in advance.
My solution was actually indeed the output protection relay. What I did was to open up the relay and use contact cleaner and a very fine abrasive to clean the contact surfaces of the relay. After that, the problem was gone!
The way to diagnose this for me was to run the amplifier open until the problem recurred and to simply tap the relay's box. The sound came on immediately, and I was convinced.
Posted on Feb 05, 2009
Based upon your description of the problem, there are a few possiblities. First a question: does this problem occur more often with low volume? If so, I'd suspect a bad output protection relay. If it is independent of the volume, resolder all of the connections in the output section. It may not look like a bad connection, but it is there.
Keep us updated.
Posted on Apr 03, 2008
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Posted on Jan 02, 2017
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