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NAD C320 on the blink.

Discussion in 'Electronic Repair' started by rob, Jul 29, 2004.

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  1. rob

    rob Guest

    Hi all

    I have a problem with a NAD C320 amp and wondered if anybody could
    offer any thoughts on what has happened and how I might fix the problem.

    The amp is hooked up to a computer (headphone output -> standard
    leads). On power-up, the computer emits quite a deep and sustained
    sound (it's an Apple Mac).

    Usually I power the amp down for the night but in this case the amp was
    left on all night. When I started up the mac in the morning, I heard
    the startup sound, but that was the last I heard from the amp.

    Now the TAPE 1 MONITOR led, which is usually green, is amber, and the
    selector button below it toggles bright <-> dim amber.

    No sound at all. Not a peep!

    I've posted on one or two other newsgroups but it seems that I may have
    posted in the wrong place as they appear (quite rightly ... I'm not
    criticising them!) more interested in discussing new gear, etc.

    NAD themselves suggest that the issue is in the selector circuit but
    want me to ship them the unit and pay them to fix it. It's way out of
    warranty and is in excellent condition (yes, apart from this problem!)
    so I'm very keen to get it fixed and avoid the same issue in the future.

    I found a posting on USENET from way back that suggests the
    soft-clipping circuit may have suffered. I don't know.

    Can anybody assist?

    Thank you

    Robin
     
  2. The model 302 has this problem resulting from a bad resistor. Could your
    "320" be a typo?

    Mark Z.
     
  3. b

    b Guest

    Not familiar with this unit, sounds like it is in protection mode
    probably due to a shorted transistor. have you measure the voltages on
    the output stage regulators or transistors ? Output protection
    devices? if the speaker terminals have DC on them the amp will
    doubtless not fire up to avoid further damage.
    just a few ideas
    Ben
     
  4. rob

    rob Guest

    Hi Mark

    Nope, it's a C320 (looking at it now).

    Sounds like the bad resistor could be an issue.

    Thanks for the reply!

    Robin
     
  5. rob

    rob Guest

    Thanks Ben for your ideas.

    I'm interested in protection mode -- how can one tell if this is
    actually the case.

    No I have not measured any voltages (no meter!) but I intend to
    appropriate some equipment and do just that.

    Regards

    Robin
     
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