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NAD C 370 no sound from speaker outputs

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  • NAD C 370 no sound from speaker outputs

    Hi, i haven't been here for a number of years. In the past, i have had invaluable assistance even though i'm not a technician.
    Might there be anyone with the patience to talk me through a possible repair of this amp?

    It was given to me a week ago and i was told that it was working, but although i get sound from the headphone output, there seems to be nothing from the speaker outputs.

    I opened it and i found a burnt resistor. R220. after downloading the service manual, i was able to find the specs for the resistor at 499ohm 1/4 watt metal film.
    The resistor is positioned on the board between a pair of very tall line amps and i can't figure out how i would get to it. I also assume that something might else might have created this burnt resistor and that simply replacing it, might not solve the problem.
    But, i don't know how i might start to troubleshoot this in an efficient way.

    I'm good with a soldering iron, but i have a limited knowledge of electronics.
    I can follow instructions.

    Regards

  • #2
    Can you attach that service manual or post a link?
    "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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    • #3
      https://elektrotanya.com/nad_c-370_sm.pdf/download.html
      I cannot seem to locate 'R220'.
      Can the OP provide a clue as to what circuit it is used in?
      Just my 2 cents but this is not an easy amplifier to work on.
      Even for an experienced tech.

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      • #4
        Pardon me for not responding faster. I only have limited access to the internet.
        Perhaps this is beyond my abilities. I can accept that.
        I don't know where to take it to anyone reputable in Cape Town, South Africa.
        I have not had dealings with anyone inspiring confidence.

        This is where i found the service manual and reference to the resistor. Page 16 five lines from the bottom of the page.


        https://elektrotanya.com/nad_c370_sm.pdf/

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        • #5
          What I was after is where the resistor is in the circuit .
          power amp. preamp, power supply???

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          • #6
            Originally posted by Jazz P Bass View Post
            pdf pg.12, over to the right of 'tape2' input jack. (between the 2 'linein' modules)

            If headphone out is working, but speakers are not, I don't see this resistor related to that problem.

            "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

            Comment

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