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  • Re: Beogram 4002 won't turn off and turns itself on - Ghost inside!

    The SO switch applies a ground to the circuit it connects to in order to keep the Beogram in the "off" position. Measure the voltage at that node (1R1 : 1D5 : 1R6) and see what it measures when the Beogram is playing and when it supposed to be off. Off should be zero volts but it sounds like yours will not measure that. Pressing the Start button bypasses the SO switch and causes the arm assembly to move forward, disengaging the SO switch. Check out the voltages of all those components involved
    Posted to General Discussion & Questions (Forum) by sonavor on Fri, Sep 24 2021
  • Re: Beogram 6000 carriage moves when lowering tonearm

    Hi, It looks like the tangential tracking sensor adjustment is not setup correctly. That is a service manual adjustment. There is a diaphragm that is attached to the tonearm pivot that controls how much light hits the tracking sensor. That sensor and its components are initially set up so the normal, stand-still position is defined. A correctly adjusted sensor assembly will not move the tonearm assembly until about one revolution of a record (being played). The playing of a record will move the arm
    Posted to Vintage Products (Forum) by sonavor on Thu, Sep 23 2021
  • Re: Finally! Beogram 400x lid without seam

    Very nice. Can you show some more photos that include the back part of it and the mounting to the dust cover hinge? -sonavor
    Posted to BeoGram (Forum) by sonavor on Wed, Sep 22 2021
  • Re: Beovox S-80 woofer problem

    Those dome pieces are just dust caps for the center part of the driver. The caps are not there any sound characteristics. They are there to prevent dust from getting into the working parts of the driver (like the spider and voice coil). I have used a large sewing needle to pry/pop the dome back into its original shape. Worst case you can remove and replace the dust cap with a new one. Speaker supply shops sell various diameter caps. When replacing the surrounds on old speaker drivers the cap is typically
    Posted to General Discussion & Questions (Forum) by sonavor on Thu, Sep 16 2021
  • Re: Beogram 8002 Repair

    I posted some oscilloscope photos of a Beogram 8002 servo motor drive signals and the two position sensor signals. I included a measurement of the Beogram 8002 going through the run-out groove of a record. -sonavor
    Posted to The Workbench (Forum) by sonavor on Wed, Sep 15 2021
  • Re: Beomaster 8000 ghost-turn on

    Hi Alf, Before you start replacing board connectors and so forth could you try disconnecting the signal line from the remote receiver circuit (on the power supply board) from the microcomputer board. That will completely disable the remote control functionality and I am curious to know if that removes the problem. If it does then we can focus on something to do regarding the remote control receiver circuit. But first...we need to make sure it is the source of the problem. John
    Posted to Vintage Products (Forum) by sonavor on Mon, Sep 13 2021
  • Re: Beomaster 8000 oscillations in output stage

    I agree with Christian. I would contact Fredrik and order a couple of his new output amplifier boards for the Beomaster. -sonavor
    Posted to The Workbench (Forum) by sonavor on Wed, Sep 8 2021
  • Re: Beomaster 8000 ghost-turn on

    Hi Alf, That is a known problem, although rare I believe. I know of five owners that have experienced the problem and there were a couple of others when I asked a while back on this Beoworld Forum. Most of the time the sudden turn on is to one of the FM presets. Typically P2 I believe. I took on one of the units and worked on it for a few months. My problem is that during that time I could never get the problem to show up here. I even tried connecting up to different house circuit breakers. Within
    Posted to Vintage Products (Forum) by sonavor on Sun, Sep 5 2021
  • Re: Beogram 8002 Repair

    I have never seen a Beogram 8000 or 8002 with the problem you describe so I can't advise you on a specific answer/solution for the issue. Unlike the Beogram 400x series turntables where there is an end stop switch and a run-out groove detection circuit, the Beogram 800x turntables rely on the two position sensor signals to count and know where the arm is. If you remove power from a Beogram 800x turntable when the tonearm is out over the platter area...then plug the Beogram back in, it will determine
    Posted to The Workbench (Forum) by sonavor on Mon, Aug 23 2021
  • Re: Beogram 8002 Repair

    That is good and interesting information. It sounds like the position counter doesn't reach the return limit on the record you are playing. Have you tried some different albums? Ones with different length run-out grooves? Maybe even test a couple of 45 RPM, 7" records. If that doesn't reveal any valuable information I am just starting another Beogram 8002 restoration myself. I should be at the stage where I can bench test it soon. When I get to that stage I will make a point to capture
    Posted to The Workbench (Forum) by sonavor on Mon, Aug 23 2021
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