Question about NAD C272 Amplifier

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NAD C272 Amplifier: Intermittent left channel


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.

David

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  • edreg May 07, 2008

    I have a NAD C270 amp with the same intermittent problem did the solution suggested work ?

  • Iordan Nov 25, 2008

    I have a similar problem. My amplifier is a Teac A-X800 DC. The problem definitely only occurs at low volume. When I increase the volume the problem disappears. How can I identify the output protection relay?

    Thanks!


  • Pieter Vleeshouwers Nov 23, 2016

    Buy a canister contact spray for your potentiometers and switches first but don,t forget also a canister of coldspray to spray on parts what react on thermical failures like these , in most cases dirth on electroprints should be the first thought second some bad dried elco capacitors replace all neccesary to get harmony again on your power supply so 1 component leaking or lost capacitance replace all capacitors thats fitted on the end-stage.

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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

  • Jesus Rincom Apr 15, 2012

    Hi, how did you open the relays, Would you give me some tips. Thank
    krearka@yahoo.com

  • Iordan Apr 17, 2012

    Hey Jesus,

    Well, when I looked at my relay, and moved the top (the cap), it was obvious that the top comes off. I can't remember whether it was glued to the bottom or not, but if you see a seam at the bottom and try to work a utility knife along the seam perhaps you would be able to pry it open. I think there are also sealed ones that won't open up! If that's the case, then can't you order a replacement relay? Surely it would cost little compared to throwing away the entire amplifier.

    Cheers,
    Iordan

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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.
Dan

Posted on Apr 03, 2008

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