water pump Scala2 - electrical diagram

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  • betmen
    Senior Member
    • May 2019
    • 90
    • Croatia

    #1

    water pump Scala2 - electrical diagram

    Hello,
    Does anyone have a wiring diagram for the pump mentioned?
    The markings on the board are 98800964 r07, two or three capacitors are burnt.
    I don't have the board with me yet, but I don't know if the printed lines on the board are visible due to the short circuit that occurred and how the capacitors were connected.​
  • CapLeaker
    Leaking Member
    • Dec 2014
    • 8135
    • Canada

    #2
    Depopulate that area, clean all the black off, look at the damage on the PCB and see where the traces are, then grind the black burnt PCB away, then either put wires and or fill it with epoxy or a different PCB and wire it back up. Shouldn't be a problem.

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    • betmen
      Senior Member
      • May 2019
      • 90
      • Croatia

      #3
      These are the pictures when the capacitors are removed, two of the contacts are completely burnt so I can't see if the right contacts of C111 and C112 are connected together or not on the top side of the board, while it seems to me that the left contacts are connected together on the bottom side of the board...
      The last picture is a picture of the bottom side of the board that I found on the internet, but there is no picture of the top side without elements, so I would like a wiring diagram.
      By the way, the pump is a Grundfos Scala2.​

      Comment

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 8135
        • Canada

        #4
        to me that top layer on pic 3 where the burnt marks are are just one sheet of copper.

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        • betmen
          Senior Member
          • May 2019
          • 90
          • Croatia

          #5
          The board is completely burned out on that capacitor contact, I'm removing it piece by piece to find a wire inside, it seems that the board is multilayered, it seems to me that the wire is inside the board, so I can find what the capacitor from that burned out part is connected to.
          In the picture on the back of the board, you can see one wire inside the board, I guess that's the one I need, but I hope there aren't any more on that small part of the board.
          That's why I'd like a schematic.​

          Comment

          • stj
            Great Sage 齊天大聖
            • Dec 2009
            • 31003
            • Albion

            #6
            it probably doesnt need those caps,
            what interests meis the fact that one side burned - so maybe it wasnt the cap that failed but the solder joint or pcb?

            Comment

            • betmen
              Senior Member
              • May 2019
              • 90
              • Croatia

              #7
              This is my fix, if nothing else is broken besides the replaced capacitors it should work, I'll see in 15-20 days when I install it.

              Comment

              • gabiz_ro
                Senior Member
                • Mar 2011
                • 167
                • Romania

                #8
                You need to clean more.
                In those regions there are layers of AC inputs and GND after bridge rectifier.
                Any little burnt area will increase rapid burning more and more between layers.
                Sorry for poor drawing, used one of pictures to draw input circuit.
                Attached Files

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                • betmen
                  Senior Member
                  • May 2019
                  • 90
                  • Croatia

                  #9
                  I connected the board to power and it shorted again.
                  I think the board has multi-layered wires so without an exact diagram I can't see how they were connected...

                  Comment

                  • Agent24
                    I see dead caps
                    • Oct 2007
                    • 4951
                    • New Zealand

                    #10
                    Originally posted by betmen
                    I connected the board to power and it shorted again.
                    I think the board has multi-layered wires so without an exact diagram I can't see how they were connected...
                    Because you didn't remove all the burnt PCB material.
                    Once it carbonises it turns conductive.

                    You need to cut out ALL the blackened material, then do repair/testing.
                    "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                    -David VanHorn

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