Home Forums Product Discussion & Questions BeoMaster Beomaster 1900 IL1 Testing

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  • #49872
    traverso
    BRONZE Member

      Hello,

      The input signal is not reaching the balance potentiometer

      It is stopped at Test Point 200 or 300 and not going through R226 and R326

      I suspect IL 1 to be faulty and would like to know how to test the lamps inside

      Thanks a lot for the feedback

       

      Alain

      #49873
      traverso
      BRONZE Member

        I could measure the IL1 lamp resistance between emitter TR24 and 15 V and found 17,7 Ohms is this value OK?

        If yes the problem is elsewhere, any thought?

        #49874
        sonavor
        BRONZE Member

          hi traverso,

          IL1 or the LDR devices inside the volume control (8002293) could be the problem.
          Take the cover off the volume control and see if the lamp illuminates.

          Did you also check the contacts on the Balance control slider?

          -sonavor

          #49875
          traverso
          BRONZE Member

            Hello,

            Thank you for the help

            I used a one Khz tone generator connected to the recorder input  and the signal arriving at the balance control is very low

            I will open the LDR by tomorrow for checking

            Alain

            #49876
            traverso
            BRONZE Member

              The lamp is probably OK as measured 17 Ohms

              However I have ordered a repair kit for this LDR

              By the way, is there a trick to remove the cover of this LDR? Is it glued or just clipped?

              #49877
              traverso
              BRONZE Member

                Actually I unsoldered the LDR, more easy to open it

                The metal cover is glued to the black plastic support see attached picture

                The lamp is dead

                LDR BM 1900

                #49878
                traverso
                BRONZE Member

                  The LDR components were the culprits

                  I used a repair kit from Beoparts and put back the LDR in the 1900, everything is fine

                  The 1900 is back to life and sing again

                  Thank you Sonavor

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