M1 Active Alesis speaker schematic & advice please

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  • zen
    Badcaps Veteran
    • Apr 2011
    • 511
    #1

    M1 Active Alesis speaker schematic & advice please

    Hi all , working on my next project .

    Rebuilt PSU

    Repaired damaged print track , including through hole connections & cleaned off corrosive glue .

    Ran up the PSU via my variac , gradually increasing AC supply , but discovered Q1 ( IRF 840 ) , becoming quite hot , therefore reluctant to increase supply to full .

    Also replaced PWM chip UC3842 .

    Anyone had this scenario ?
    Attached Files
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    • Khron
      Badcaps Legend
      • Sep 2006
      • 1350
      • Finland
      #2
      Re: M1 Active Alesis speaker schematic & advice please

      Why not post this in the main thread about this? The one that's stickied at the top here?
      Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

        Comment

        • zen
          Badcaps Veteran
          • Apr 2011
          • 511
          #3
          Re: M1 Active Alesis speaker schematic & advice please

          Thanks , can do but was hoping to keep it as a separate issue , rather than mixing with other problems on the M1'S

            Comment

            • zen
              Badcaps Veteran
              • Apr 2011
              • 511
              #4
              Re: M1 Active Alesis speaker schematic & advice please

              Replaced Q3 ( 2N5551 ) & Q4 ( 2N5401 )

              Both measured good on a cold test , therefore failing under load . Located on gate drive circuitry for Q1 , which is now running cool .

              Speaker working & on test .
              Attached Files

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