Soudcraft Spirit M12 mixer schematic please

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  • zen
    Badcaps Veteran
    • Apr 2011
    • 511
    #1

    Soudcraft Spirit M12 mixer schematic please

    Hi all

    This is my next project .

    Rebuilding PSU & require values of R36 & R47

    Both measuring around 650R .
    Attached Files

    if you find these attachements useful please consider making a small donation to the site

    Tags: None
    • zen
      Badcaps Veteran
      • Apr 2011
      • 511
      #2
      Re: Soudcraft Spirit M12 mixer schematic please

      Pcb no - sc4105-05 legend

        Comment

        • zen
          Badcaps Veteran
          • Apr 2011
          • 511
          #3
          Re: Soudcraft Spirit M12 mixer schematic please

          Found this site

          Looks like they have been replaced using 680R types

          http://studiorepair.com/gallery/Soun...612145982.html

            Comment

            • zen
              Badcaps Veteran
              • Apr 2011
              • 511
              #4
              Re: Soudcraft Spirit M12 mixer schematic please

              R17 also cooked . Connected to pin 6 of IC6 ( UC3842AN ) , which is faulty as well .

              Can anyone help with the value ?

              I'm guessing 22R or 220R ( see picture )
              Attached Files

              if you find these attachements useful please consider making a small donation to the site

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                • zen
                  Badcaps Veteran
                  • Apr 2011
                  • 511
                  #5
                  Re: Soudcraft Spirit M12 mixer schematic please

                  Pulled datasheet for the UC3842AN & pin 6 is the gate drive output to FET .

                  Diagram shows resistor as 22R ( see link )

                  https://pdf1.alldatasheet.com/datash.../UC3842AN.html

                    Comment

                    • zen
                      Badcaps Veteran
                      • Apr 2011
                      • 511
                      #6
                      Re: Soudcraft Spirit M12 mixer schematic please

                      R24,r27 & r35 , all 1r o/c
                      Attached Files

                      if you find these attachements useful please consider making a small donation to the site

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                        • zen
                          Badcaps Veteran
                          • Apr 2011
                          • 511
                          #7
                          Re: Soudcraft Spirit M12 mixer schematic please

                          Last , but by no means least FET 1 ( P7NB60FP ) , S/C . Manufactured by ST Electronics .


                          With PSU in stand alone , gradually increased AC supply using the variac .

                          No big bangs which is good & all secondary supplies seem to be present .

                          Will fit PSU back into mixer next week , when i have some free bench space to test fully .
                          Attached Files

                          if you find these attachements useful please consider making a small donation to the site

                            Comment

                            • zen
                              Badcaps Veteran
                              • Apr 2011
                              • 511
                              #8
                              Re: Soudcraft Spirit M12 mixer schematic please

                              Also , before i forget , the two 47MF ,50V electrolytic caps on primary side of chopper required replacement due to poor ESR .

                                Comment

                                • redwire
                                  Badcaps Legend
                                  • Dec 2010
                                  • 3912
                                  • Canada
                                  #9
                                  Re: Soudcraft Spirit M12 mixer schematic please

                                  D2 looks cracked, broken and possibly part of the snubber network

                                    Comment

                                    • zens electronics
                                      Member
                                      • Jan 2021
                                      • 31
                                      • uk
                                      #10
                                      Re: Soudcraft Spirit M12 mixer schematic please

                                      Hi redwire , yes it does in the picture but it's absolutely fine .

                                        Comment

                                        • Khron
                                          Badcaps Legend
                                          • Sep 2006
                                          • 1350
                                          • Finland
                                          #11
                                          Re: Soudcraft Spirit M12 mixer schematic please

                                          Anything useful here?

                                          https://elektrotanya.com/showresult?...a=All&kat2=All
                                          Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

                                            Comment

                                            • zen
                                              Badcaps Veteran
                                              • Apr 2011
                                              • 511
                                              #12
                                              Re: Soudcraft Spirit M12 mixer schematic please

                                              Thanks Khron , will check it out , although seems to be all sorted .

                                              Just need to fit PSU back into mixer & test .

                                                Comment

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