Home Forums Product Discussion & Questions BeoGram Beogram 3000 5901, motorcontrol schematic

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  • #47535
    on4dag
    BRONZE Member

      Hello,

      Has someone a schema of the motorcontrol unit on the PCB of the motor? I have taken the motor apart and it’s running, but the controller PCB has a problem. On the PCB IC808 (hall ic or PWM?), a thyristor, some capacitors and resistors.

       

      I just want to see how this functions and if their are parts availbale. The IC808 search didn’t show something on google.

      Thank you for help.

      Kind regards, Erik

      #47536
      on4dag
      BRONZE Member

        Some photos of the situation.

         

         

        #47537
        Mark-sf
        BRONZE Member

          The motor was considered a single part so B&O did not publish the control-board schematic. What is the nature of the problem you are experiencing. Most of the time its the bearing drying out not an electronic issue.

          #47538
          on4dag
          BRONZE Member

            Hi Mark,

            I had a blown fuse and only the motor module caused this.

            I have tested the motor and it runned but with noise. Now I have re oiled the bearings but didn´t test the whole again. Can dry bearings cause an overcurrent to blow the fuse? If so, then I have to install it again and test it. What is your experience?

             

             

            #47539
            on4dag
            BRONZE Member

              I have reinstalled and motor is functioning!

              Motor makes still some noise, from the brushes. So I have to look if these are still available.

               

              #47540
              garncarz1988
              BRONZE Member
                #47541
                on4dag
                BRONZE Member

                  Thanks all for your help.

                   

                  I have a question on the main bearing (nylon fitting) but I will make a new topic / post

                  #47542
                  Mark-sf
                  BRONZE Member

                    You do not apply oil to the bearing. It needs to be infused in a vacuum. My experience is that they are still the source of your noise.

                    #47543
                    on4dag
                    BRONZE Member

                      Hi Mark,

                      thank you for your remark. I have seen some posts on this topc and I am thinking of doing this (“oil-vacuum”) as well. But first I had to check if the other parts were all doing well.

                      Thanks for your help.

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