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low volume outpout

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  • low volume outpout

    good day i have this amp. of mine it used to work just fine.but suddenly the output volume became so low.
    what is the problem?? what part of the amp is broke?

  • #2
    Hi and welcome.

    What is the make and model?

    Comment


    • #3
      its a sony stereo mhc-dx5 amp

      Comment


      • #4
        Good luck with the problem being isolated to 'one part'.

        Click image for larger version

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        These 'mini hi fi's' are a real hoot to get apart.

        If both channels are low in volume, it may be a simple power supply issue, which would involve testing each of the power rails.

        The output ic is a STK402 brick. One per channel.

        The service manual can be found here:
        http://archivos.diagramas.mx/audio/H...0DX5J%20sm.pdf

        Comment


        • #5
          yes both of the channels volume is low

          Comment


          • #6
            Lets start simple.
            Do the headphones work?
            The headphone jack mutes power to the speakers. A bad jack could cause the problem.
            Have you tried other speakers?
            They could be blown.

            Comment


            • #7
              headphones volume is low too
              and no i didnt try other speakers

              Comment

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