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  • Re: Beomaster8000 repair/resoration

    Hi John, work has resumed, the Omron relays are installed as well as a new 330nF suppression cap - I ordered the same typ as seen in your picture, class X2. while waiting for the paper caps I got hold of a metallized/polyprop class X2 / 330nF cap, which is also used for the same purpose - should I go back and reinstall the original paper cap type instead ?? all relays are getting energised and nothing has gone up in smoke yet ๐Ÿ™„, however the same issue seems to haunt me: where is the volume ?? repaired
    Posted to Vintage Products (Forum) by ALF on Tue, Apr 9 2019
  • Re: Beomaster8000 repair/resoration

    Hi John, so much work has gone into this.....thank you very much ๐Ÿ˜๐Ÿค™ glad I threw up something interesting for our readers & followers. does that mean Lonnie’s Schrack relay choice should not be used as a RL1 replacement ?? i noticed the different B&O part numbers in the SM but as you mentioned....in the absence of any further info on the parts......! a quick recap: after measuring open coils on both the old relays, something that appeared to be the reason for not getting energised
    Posted to Vintage Products (Forum) by ALF on Wed, Apr 3 2019
  • Re: Beomaster8000 repair/resoration

    Ok, back on the project: it turned out both of the old relays RL1 & 2 were dead. Today was the big day .....well and truly ! two new Shrack relays in.....and both relays clicked ๐Ÿ˜. Nice, but short lived ! after adjusting the no-load current and connecting two speakers the BM suddenly disappeared in a cloud of stinking smoke coming from board #7 - the start-up circuit ! ๐Ÿ˜ก๐Ÿ˜ก what happened was C1 - the 330nF/275V cap - blew up in smoke - a miracle the smoke alarm wasn’t triggered. now, the
    Posted to Vintage Products (Forum) by ALF on Tue, Apr 2 2019
  • Re: Beomaster8000 repair/resoration

    Well, an additional question for 7C1 replacement would be: Kemet paper cap or Polypropelene cap ?? ALF
    Posted to Vintage Products (Forum) by ALF on Tue, Apr 2 2019
  • Re: Beomaster8000 repair/resoration

    Thanks Martin.....just what I suspected ! can you recommend or perhaps suppy a suitable one for 7RL1 ? thanks ALf
    Posted to Vintage Products (Forum) by ALF on Tue, Apr 2 2019
  • Re: Beomaster8000 repair/resoration

    Understood ! Thanks for clarifying that for us. most helpful ๐Ÿ˜ ALF
    Posted to Vintage Products (Forum) by ALF on Tue, Apr 2 2019
  • Re: Beomaster8000 repair/resoration

    MANY thanks Lonnie, I ordered the one you suggested - I wonder if that would be suitable as a RL1 replacement as well....just in case ?! will report back with further progress. best ALF
    Posted to Vintage Products (Forum) by ALF on Tue, Mar 26 2019
  • Re: Beomaster8000 repair/resoration

    Ok, I checked and trsted off-board 6TR18 once again - no adverse findings. as per circuit diagram its collector is connected via P51- pin1 to 7RL2..... here is where the problem may be hiding? took out RL2, checked the resistance of its coil.....OL !!! Meaning its coil is burnt ๐Ÿ˜ณ๐Ÿ˜ข now the tricky part: where do I get a replacement relay ? any suggestions are most welcome - thank you ALF
    Posted to Vintage Products (Forum) by ALF on Mon, Mar 25 2019
  • Re: Beomaster8000 repair/resoration

    thanks for your getting back John, I guess ‘guilty as charged!’ no, I did not shorten the crystals ๐Ÿ˜ข but I carefully removed the two uPs before I caried out the operation and reset both on new machined tulip-style sockets. Quite possible that I may have damaged the main processor ?? too late now to worry about - i do remember now when I studied how to do that. there are definitely 5V present at the loose end of female P76, meaning the connecting cable is fine. As I understand the 5V
    Posted to Vintage Products (Forum) by ALF on Sun, Mar 24 2019
  • Re: Beomaster8000 repair/resoration

    Ok, solder-bridge at 9L7 !!! the 5V supply has been restored ๐Ÿ™„๐Ÿ˜ the uP test came out as ‘TP’ ๐Ÿค™๐Ÿ™ now I get a chance to follow uo on Lonnie’s suggestion about a possibly faulty 7RL1 or 2... I’ll be back ALF
    Posted to Vintage Products (Forum) by ALF on Sun, Mar 24 2019
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