Announcement

Collapse
No announcement yet.

Mackie mixer power supply no power

Collapse
X
Collapse
 
  • Page of 2
  • Filter
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
    #21
    Re: Mackie mixer power supply no power

    It is likely ok, I can't see any real way it could fail as there is very little current in that circuit. probably used to slightly adjust the power supply with temperature. I see values from 2k to 200k for similar ntc or ptc devices.

    Comment

      #22
      Re: Mackie mixer power supply no power

      I've checked the thermister with my multimeter in the ohms selector and this is what i get is this ok
      Attached Files
      Your never to old to learn

      Comment

        #23
        Re: Mackie mixer power supply no power

        heat it and cool it and see if value changes

        Comment

          #24
          Re: Mackie mixer power supply no power

          So did you replace C9 as suggested? What dc V reading between the two legs of that C9?
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

            #25
            Re: Mackie mixer power supply no power

            i will do those checks and let you know
            Last edited by garrymc123; 06-28-2018, 03:16 PM.
            Your never to old to learn

            Comment

              #26
              Re: Mackie mixer power supply no power

              cheers guys Finally got a chance to do some checks on c9 I have 15.35vdc on the optocoupler I have 2.403vdc on the hot side and no voltage on the secondary side and on the thermister, its 99.60hms cold and 24.3ohms hot then rises back to 99.6ohms still to check u100 ic and u101 ..what do u mean by hot ground
              Your never to old to learn

              Comment

                #27
                Re: Mackie mixer power supply no power

                Take a very close look a the transformer with the yellow tape on it

                In the last photo that was posted it looks like one of the terminals that is to the board does not look very good

                or the way the light is hitting it but it looks duller

                (and there looks like a lot of flux is there )

                than the other terminals that I can see I would recommend resoldering all of the pins for that transformer

                I would also think about replacing U100

                What is your voltage on the Optic Sensor on the input side which most of the time is pin 1 and 2
                Last edited by sam_sam_sam; 07-01-2018, 08:19 AM.
                9 PC LCD Monitor
                6 LCD Flat Screen TV
                30 Desk Top Switching Power Supply
                10 Battery Charger Switching Power Supply for Power Tool
                6 18v Lithium Battery Power Boards for Tool Battery Packs
                1 XBox 360 Switching Power Supply and M Board
                25 Servo Drives 220/460 3 Phase
                6 De-soldering Station Switching Power Supply 1 Power Supply
                1 Dell Mother Board
                15 Computer Power Supply
                1 HP Printer Supply & Control Board * lighting finished it *


                These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                2 Hem Saw Computer Stack Board

                All of these had CAPs POOF
                All of the mosfet that are taken out by bad caps

                Comment

                  #28
                  Re: Mackie mixer power supply no power

                  so did you change c9?

                  Comment

                    #29
                    Re: Mackie mixer power supply no power

                    Thanks, everyone for all your help. STJ was correct all along, new caps arrived today so replaced c9 10uf 50v which was open and now power supply up and working will stick it back in the mixer tomorrow and let you know if it powers up ok ..Thanks Again
                    Attached Files
                    Your never to old to learn

                    Comment

                      #30
                      Re: Mackie mixer power supply no power

                      It might be a good idea to replace or check all the caps on this board
                      Last edited by sam_sam_sam; 07-02-2018, 10:54 AM.
                      9 PC LCD Monitor
                      6 LCD Flat Screen TV
                      30 Desk Top Switching Power Supply
                      10 Battery Charger Switching Power Supply for Power Tool
                      6 18v Lithium Battery Power Boards for Tool Battery Packs
                      1 XBox 360 Switching Power Supply and M Board
                      25 Servo Drives 220/460 3 Phase
                      6 De-soldering Station Switching Power Supply 1 Power Supply
                      1 Dell Mother Board
                      15 Computer Power Supply
                      1 HP Printer Supply & Control Board * lighting finished it *


                      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                      2 Hem Saw Computer Stack Board

                      All of these had CAPs POOF
                      All of the mosfet that are taken out by bad caps

                      Comment

                        #31
                        Re: Mackie mixer power supply no power

                        cheers I have checked the other caps and all seem to be within spec I have plugged the power supply back in the mixer and it has powered up ok.. I will let it run for a couple of hours and just to be sure..thanks to everyone again for there help and advice
                        Attached Files
                        Your never to old to learn

                        Comment

                          #32
                          Re: Mackie mixer power supply no power

                          I am glad that you got it working again
                          9 PC LCD Monitor
                          6 LCD Flat Screen TV
                          30 Desk Top Switching Power Supply
                          10 Battery Charger Switching Power Supply for Power Tool
                          6 18v Lithium Battery Power Boards for Tool Battery Packs
                          1 XBox 360 Switching Power Supply and M Board
                          25 Servo Drives 220/460 3 Phase
                          6 De-soldering Station Switching Power Supply 1 Power Supply
                          1 Dell Mother Board
                          15 Computer Power Supply
                          1 HP Printer Supply & Control Board * lighting finished it *


                          These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                          1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                          2 Hem Saw Computer Stack Board

                          All of these had CAPs POOF
                          All of the mosfet that are taken out by bad caps

                          Comment

                            #33
                            Re: Mackie mixer power supply no power

                            Great you got it going ..what happened with your two behringer desks Garry?

                            Comment

                            Previous 1 2 template Next
                            Working...
                            X