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ARCHIVED FORUM -- April 2007 to March 2012
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This is the first Archived Forum which was active between 17th April 2007 and 1st March February 2012

 

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  • Re: BeoGram 4000 Restoration

    Yes, Jacques, that would also work nicely. Martin, thanks for your pointers - the 2 resistors were actually not touching, but close, but anyway, that was the first picture I took when I opened the unit - I had not even cleaned it yet! But it was the only picture I had to post here! Now I have more pics! Also, the leads on my new main capacitors are
    Posted to The Workbench (Forum) by yachadm on 09-25-2011
  • Re: BeoGram 4000 Restoration

    Until I understood how the < and > switches worked, this was very frustrating. Once I understood how they worked, it is obvious why B&O changed the design to separate << , < , > , >> buttons on the BG4002/4 and BG6000. On this BG4000, the < or > , has 2 functions. It is not obvious from the schematic or the component
    Posted to The Workbench (Forum) by yachadm on 09-25-2011
  • Re: BeoGram 4000 Restoration

    Movie time! BeoGram 4000 Restoration Function Test Functioning perfectly - I had to disassemble all the keyboard switches again, and add solder to the flappers to tension them - now the < and >, slow and fast speeds function perfectly. Next up is the cosmetic restoration! Anyone know of a workshop which can build a new acrylic cover?
    Posted to The Workbench (Forum) by yachadm on 09-23-2011
  • Re: BeoGram 4000 Restoration

    Almost all done - after replacing all the caps on the main PCB, and many out-of-spec resistors, it's almost working 100%. EXCEPT for one thing - When pushing < (Forward), adjusting the poti does nothing. Motor Voltage remains at 12.5VDC. Rearward > works just fine - I've set it at 5VDC - the SM states 3V, but that's too slow. There
    Posted to The Workbench (Forum) by yachadm on 09-21-2011
  • Re: BeoGram 4000 Restoration

    Filip, You need to move that vertical catch out of the way at the rear of the arm to do the ZeroBalance setup. The cartridge must be mounted when you do it.
    Posted to The Workbench (Forum) by yachadm on 09-21-2011
  • Re: Beogram CD5500 transport noise

    It sounds like the CD transport mechanism is not sitting correctly - when the cover is open, the pressure is removed, so it's quiet, and when the cover is open, it's pressuring a part of the mechanism, so it resonates. Replace all the capacitors on that PCB - send me a pic of the pcb if you want a kit with the correct replacements. Adjust the
    Posted to BeoGram (Forum) by yachadm on 09-20-2011
  • Re: Beocenter 9000 strange behaviour - Help needed.

    Hi Yann Please contact me at yachadm AT gmail DOT com I have all the necessary components you need to supply your tech, to repair your circuit boards to new operating specifications. Menahem
    Posted to The Workbench (Forum) by yachadm on 09-20-2011
  • Re: Beogram CD5500 transport noise

    Hi Jacques Not sure what you mean about the noise, but if you want to get instant TOC, see the regulator mod on my Philips CDB650 article (section 6) on my website - www.condoraudio.com - exactly the same circuit boards. Menahem
    Posted to BeoGram (Forum) by yachadm on 09-20-2011
  • Re: BeoGram 4000 Restoration

    Thanks for the compliment, Martin! I did write a little article about this - it's on my website - here's the link. How to Choose Replacement Capacitors and Resistors when Repairing and Restoring Vintage Stereo Equipment This is a layman's explanation, with a fair bit of literary license! Basically, the more linear / stable the power supply
    Posted to The Workbench (Forum) by yachadm on 09-19-2011
  • Re: BeoGram 4000 Restoration

    This is the ripple on the 23.2V circuit with the new 3900uF capacitor. Capacitance measured 3662uF. Ripple 1000mV pp. Similar results on all 4 circuits.
    Posted to The Workbench (Forum) by yachadm on 09-18-2011
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