Beolab 8000 issue, not clicking on

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Home Forums Product Discussion & Questions BeoLab Beolab 8000 issue, not clicking on

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  • #43247
    Prime
    BRONZE Member
      • Topics Started 2
      • Total Posts 14

      Hey guys,

      I’m new and you think: here comes another owner of a Beolab 8000 set with issues :p And yes! I have issues with my Be0lab 8000 set. Well with one of the pair that is.

      It doesn’t turn on when I give it input over the Line after it’s been turned off for some time. When I unplug the power for a couple of hours, and plug it back in. It works again. Most of the time it keeps playing, but sometimes it also stops while music is just playing.

      But when it works, I can turn music off and on again, and the speaker also nicely turns on and off in respons. The problem occurs when it has been in standby mode for a long time (12 hours or something)

      It feels like it enters some sort of self preservation mode or fail safe to shut itself down or something. And unplugging it from power seems to reset it.

      My other speaker is working fine, I also swapped them from position and cables. And it is definately the speaker.

      The set has the white foam inside (no foam rot), and the inside is looking clean. I removed the amp but I can’t see anything. But it’s also, I don’t know what I am looking for.

      Do you guys can give me some tips or hints on where to look? Or do you need more info?

      Here are some pics of the amp.

       

      WhatsApp Image 2023-01-23 at 20.46.01WhatsApp Image 2023-01-23 at 20.45.59

       

       

       

      #43248
      carljh
      GOLD Member
        • Stockholm
        • Topics Started 3
        • Total Posts 29

        Interesting, I got the exact same problem! You can check my post here: https://beoworld.org/forums/topic/beolab-8000-turn-off-after-some-hours/

        #43249
        Prime
        BRONZE Member
          • Topics Started 2
          • Total Posts 14

          Interesting, I got the exact same problem! You can check my post here: https://beoworld.org/forums/topic/beolab-8000-turn-off-after-some-hours/

          Thats a coincidence, seems like the same problem indeed. Did you find anything yet? I removed the amp, but I cant see anything on first sight. I think I need to assemble it again and do some measuring when its powered and in standby.

          Ill also try if I have the same problem using a Powerlink adapter to RCA.

          #43250
          carljh
          GOLD Member
            • Stockholm
            • Topics Started 3
            • Total Posts 29

            I will also look into this in the weekend and try to measure around the “auto start” circuit and compare the difference between the good speaker and the bad one. Please find the service manual attached which include circuit schemes and block diagram as well as some instructions that can help. It mention that you can short-circuit the C83 in order to block the autostart so this capacitor could be the error cause. I will check the electrolyte capacitors because these can show strange behaviours if the are old.

            If you want to make your own RCA to DIN cable, connect pin 4 to maximum 5V and pin2 to ground. Skärmavbild 2023-01-25 kl. 10.24.01

            Please note the the RCA-DIN connector will be mirrored compare to the picture above.

            Please keep me informed if you make any progress.

            /Carl

            #43251
            carljh
            GOLD Member
              • Stockholm
              • Topics Started 3
              • Total Posts 29

              I changed the IC1 OP amp circuit yesterday and now it work. The type is 4558 and this can be hard to find but there are alternatives.

              #43252
              Prime
              BRONZE Member
                • Topics Started 2
                • Total Posts 14

                Hi, where can I find this OC1 ? And where did you get your replacements?

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