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  • Re: ORP61 wanted for Beogram 4000

    Nevertheless, i sourced some NOS ORP61 from germany....just in case it did not break the bank πŸ˜πŸ€™ ALF
    Posted to BeoWorld Private Wanted (Forum) by ALF on Thu, Dec 6 2018
  • Re: Beogram 400x tracking force repair

    Permission to laugh 😬😁 Martin ? I red this reply before woth a big smile.......YES, a MMC20CL is fitted !! However any mistake is possible and I imagine you have seen some incredible mistakes with your years of experience....nevertheless, we all do them from time to time ! no question is too silly I learnt in my teaching years...so, thanks anyway. I revisited the SM and have repeated the complete arm adjustment precedure - looks like it worked this time....??! I definitely prefer the plain counterweight
    Posted to BeoGram (Forum) by ALF on Sat, Nov 24 2018
  • Beogram 400x tracking force repair

    hi everyone, sitting over my BG4002 and trying to adjust the tracking force to at least 1g......no, not near it, no matter what I do to the arm - haven’t twisted it yet though 😑 basically I do know how to balance and adjust but it simply won’t work. took the adjustment knob off and made sure the lower gear wheel is grabbing the the torsion spring. now the question is: do I have to apply pre-tension to the spring or no tension (neutral) at all ? so far I did try almost every trick in
    Posted to BeoGram (Forum) by ALF on Fri, Nov 23 2018
  • Re: beogram4000 issues

    Too right John ! to put it blunt: right now I have absolutely no idea what is going on with this table ? there are only a finite number of mechanical contacts to check. I double and tripple checked they all provide good contact - all have been cleaned as much as it was possible. the old servo belt had it and I am awaiting Martins shippment for a new one to put on. why the carriage only moves a very short distance and almost immediately after drops the arm is puzzling. don’t tell me there is
    Posted to BeoGram (Forum) by ALF on Fri, Nov 23 2018
  • Re: beogram4000 issues

    This is also an interesting example of an issue where the fault-finding flowchart in the service manual may!! lead you to “nowhere” or masking underlying issues: quote: .....is the carriage moving inwards ? N is OM2 running ? Y is carriage blocked ? N. ===>. Repair spindle, fit belt !! 😬😬 it is not that easy and straight forward 😒 so, I am looking forward to study Nick’s training course notes he offered. may there be some light at the end of the tunnel. ALF
    Posted to BeoGram (Forum) by ALF on Mon, Nov 19 2018
  • Re: beogram4000 issues

    Yes Nick, of course, it is the stop switch (what I actually meant) πŸ™„ I only mentioned the recap as it usually comes up as one of the “must do things”, but it was not on my agenda straight away. well, the relevant course notes would be fantastic - thanks for your thought Nick...happy to receiveπŸ™πŸ€— see how things progress....😳 ALF
    Posted to BeoGram (Forum) by ALF on Mon, Nov 19 2018
  • Re: beogram4000 issues

    What happens after ON is activated is a mm long move of the carriage inwards, just enough to clear the on/off nipple switch. if I do that exercise without having the servo belt fitted the platter motor starts spinning and so does the little servo /carriage motor. Yes, the spindle pully is the old plastic one - I still have a metal replacement I could fit but the carriage was moving freely towards the drop-down point before all that jazz started but will double check that pully/spindle issue. when
    Posted to BeoGram (Forum) by ALF on Sun, Nov 18 2018
  • Re: beogram4000 issues

    Well, the 24V supply is showing about 23.4VDC - and that is the case at all suggested Collectors of TR27, 28, 31 and 33. the two reservoir caps 0C1 and 0C (2000uF/15V) measured actually about 3140uF and have been replaced - thanks for pointing this out !! sadly, that did not yet show any improvement in the carriage performance. the carriage motor is running freely - I can hear it clearly when its naked pully (no belt) spins (both directions). as said, a new servo belt is coming but this alone won’t
    Posted to BeoGram (Forum) by ALF on Sun, Nov 18 2018
  • Re: beogram4000 issues

    Hi Nick, yes, thanks for reminding me - I did indeed carefully sand those brass contacts - sadly no positive outcome to report. just ordered a new servo belt from Martin and will see what that changes?? If anything ?? the carriage control does not perform as usual at all - does not move up to the drop-down point, arm drop right after activating ON..... I tested TR26 to TR33 off-board.....all good - also checked the diodes D7 to D14, but not off-board. the main board has not yet been recapped...should
    Posted to BeoGram (Forum) by ALF on Sat, Nov 17 2018
  • Re: beogram4000 issues

    Ok, I finally got the carriage to stand still πŸ™„ so I can actually verify the voltages: E of TR28/31 shows around 70mV, not 0V as per CD B of TR27 is varying between 45 to 90mV, not 0V as per CD B of TR33 is around 150mV, not 0V as per CD B of TR25/34 show 0.69 to 0.72V which I think is ok. to sum up: 0V at ON and ^ activated are not present ☹️ I guess it is off to a transistor check/test off board ! ALF
    Posted to BeoGram (Forum) by ALF on Thu, Nov 15 2018
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