Sign in   |  Join   |  Help

Search

  • Re: 4002 motor not responding??

    Hi ALF, Great, the measurement was to confirm the wiring from the main board to the keyboard was all intact. So the bottom half of the bridge is intact. One thing to cross off. Did you confirm the bottom end of the bridge is grounded? Regards Lonnie
    Posted to BeoGram (Forum) by Lonnie on Fri, Jul 22 2016
  • Re: 4002 motor not responding??

    Hi ALF, Sorry - 1R24 should be set to approx 1k4 ohms not 1k9. Regards Lonnie
    Posted to BeoGram (Forum) by Lonnie on Fri, Jul 22 2016
  • Re: 4002 motor not responding??

    Hi ALF, If we concentrate on the 45 rpm circuit first, the top end of the Wien bridge is made up of 1R22 + 1R24 in parallel with 1R23 all in series with 1C11. The bottom end of the bridge is made up of 1R18 in series with 2R2 in parallel with 1R17 all in parallel with 1C9. To make sure the bottom end of the bridge is properly connected you can measure the resistance from 1R17 through PO across to 2R2 and back up to 1R18. If this is all connected the only resistance you should measure will be approx
    Posted to BeoGram (Forum) by Lonnie on Fri, Jul 22 2016
  • Re: 4002 motor not responding??

    Hi ALF, I haven't work out how to make them smaller either, my last pic is evidence of that! 1 extra thought: 1R17 & 1R18 join together at one end and the other ends join via 2R2 (1K) on board 6140376 (45 rpm adjuster on the keyboard). Can you measure the resistance between 1R17 & 1R18 to make sure that the wiring that goes from the main board to board 6140376 is intact. Do the same for 1R15 & 1R16. If it's ok it will measure less than 1k and if it's not ok it will measure
    Posted to BeoGram (Forum) by Lonnie on Thu, Jul 21 2016
  • Re: 4002 motor not responding??

    Hi ALF, No problem about the caring, you've got a great little mystery going on here and I'm looking forward to the solution. I noticed in a previous post that you flagged that 1C6,7 & 13 are spot on. I presume that you removed them from the board to test them??? Have you checked and double checked that 1C6&7 are correctly re-installed? Are you able to upload some photos of the component and solder side around your Wien bridge oscillator? I/we can help check your work without asking
    Posted to BeoGram (Forum) by Lonnie on Thu, Jul 21 2016
  • Re: 4002 motor not responding??

    Hi ALF, I have a 4002 AC motor BG so I thought I'd post an original picture that may help??? From what I have read I am thinking that 1TR7 is the problem. Did you replace it with a TO-39 packaged BC-142? The lead identification tab should point towards R17 - see below photo. The flat face of 1TR5&6 that you replaced should be facing away from TO-39. Anyway keep at it, you'll get there in the end. Regards Lonnie
    Posted to BeoGram (Forum) by Lonnie on Wed, Jul 20 2016
  • Beogram 8002 Anti-static Spring

    Hi Everyone, I'm just about to put the top plate back on my newly acquired Beogram 8002 and I've realised that it was missing the anti-static spring. Does anyone have a spare spring or measurements (ie diameter top & bottom, free length etc) so that I can track an alternative down. Many thanks Lonnie Australia
    Posted to BeoWorld Private Wanted (Forum) by Lonnie on Mon, Jun 27 2016
Page 7 of 7 (67 items) « First ... < Previous 3 4 5 6 7 | More Search Options
Beoworld Security Certificate

SSL