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  • Re: Beomaster8000 project

    Sorry, should read ‘....4053 triple input 2-channel analog multiplexer....’ ALF
    Posted to BeoGram (Forum) by ALF on Wed, Jan 30 2019
  • Re: Beomaster8000 project

    Hi John, great minds think alike ๐Ÿ˜๐Ÿ˜, although this seems slitghly “unbalanced” ! i did indeed unsolder and put back in place (hope dies last)...no effect. the big trimmers were already earmarked for replacement and are on their way. sadly I don’t have. mouser or similar shop around the corner to get these excotic trimmers exceot from overseas,....pretty sad I think ! I will follow up on the DIN plug lead and will also be on the look out for a AD7110 chip - it almost looks like
    Posted to BeoGram (Forum) by ALF on Tue, Jan 29 2019
  • Re: Beomaster8000 project

    Hi John, the trimmers are from Telec Electronics Netherlands and the seller is on ebay under ‘posttrade’ Piher has so many different types so it took me a while to get to the correct type. yes, you are right with the AD7110 chip.....has to be china......I may have to go down the same path unless my local contact, a retired B&O repairer with a vast amount of spares, does have a couple AD10/278 and AD7110 chips in his vault ?? Won’t hold my breath.....if he has some left I will
    Posted to BeoGram (Forum) by ALF on Tue, Jan 29 2019
  • Re: Beomaster8000 project

    Ok John, first back to the tone/filter board 4P24: found a cracked joint at pin 6 which triggered an intensified recheck on that very board with no further findings. checked the attenuator circuit voltages as suggested, all pretty good except the 0 V which was between 15 and 20mV Next was a re-check of the preamp board, looking for cracked joints again around the connectors....no findings. what I noticed however were signs of previous “repair work” on one of the AD10/287 ICs looking at
    Posted to BeoGram (Forum) by ALF on Mon, Jan 28 2019
  • Re: Beomaster8000 project

    Hi John, thanks again for taking time to analyse the issue. what happens is the audible volume seems to be stuck at the lowest level, no matter what I do ?!! when turning the vol wheel the numbers on the display do change - same thing when I use the remote for that - but the audible volume does not change ! which would indicate as you mentioned that the designated vol control IC may not get commands ? is my understanding correct ? ALF
    Posted to BeoGram (Forum) by ALF on Sun, Jan 27 2019
  • Re: Beomaster8000 project

    Hello John, in the meantime I did check if there was any voltage change at 9IC3 & 4 when turning the vol wheel.....which was the case. I shall revisit the tone/filter board and the vol control IC. another thought that worried me is the actual signal I can hear , asking myself whether this is just “cross talk” ? when I change from FM to any other inputs like TP1/2 or PH I can still here that very low vol FM signal.....? That can’t be right or is this another problem pointer
    Posted to BeoGram (Forum) by ALF on Sun, Jan 27 2019
  • Re: Beomaster8000 project

    Hi John, great to read you were interested to deliver some “first aid” ๐Ÿ™„๐Ÿ˜ฌ i dis-assembled the control panel and checked all soldering - no wires were loose. when I turn the volume-wheel I can see the volume-indicating display part is changing but It doest not translate into any increase in volume ? i can also operate the volume with the remote....same result. i checked the tone/filter board #4 again for possible cracked soldering and connections.....all good ?! next check was along
    Posted to BeoGram (Forum) by ALF on Sat, Jan 26 2019
  • Beomaster8000 project

    greetings all, it is that time again when I am looking for the “Beomaster specialists” help/advice/pointers..... it started with a complete recap job......finished now, except the big reservoir caps - all trsted well within spec. the 1st roadblock after that was a wild switching of both relays on the start-up board....that was rectified by replacing both crystals on the uP board and while that happened I decided to replace both uP sockets with high quality tulip style ones. after adjusting
    Posted to BeoGram (Forum) by ALF on Thu, Jan 24 2019
  • Re: Wanted: output cable for Beocord 6500/7000

    Hi Steve, once again thank you for your reply. not sure whether there’s a misunderstanding or not ? the cable or wire-harness I am chasing is the hard-wired cable with one DIN plug attached connecting to a BM while the other end is hard-wired directly onto the main board of the BC6500 - in other words it is non-removable like a interconnect but like the powercable. regards ALF
    Posted to BeoWorld Private Wanted (Forum) by ALF on Tue, Jan 15 2019
  • Wanted: output cable for Beocord 6500/7000

    Hi All, still looking for the output cable with 5-pin DIN attached for my Beocord 6500. BC5500 or BC7000 cable will also work. if you habe one please send me a PM cheers ALF
    Posted to BeoWorld Private Wanted (Forum) by ALF on Fri, Jan 11 2019
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