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  • Re: Beomaster 8000 restoration #3

    Bad news I am afraid: fuses blowing on the #7 board and I fear the standby transformer has a short ?! if 3OT1 is disconnected from #7 board fuses stay on, if reconnected fuses blow ! it is not the power supply board as after disconnecting P52 fuses still blowing ๐Ÿคฌ๐Ÿ˜ข looks like I have to chase the almost impossible replacement for that standby transformer ๐Ÿ˜ข unless one fellow Beoworld member can help ? ALF
    Posted to Vintage Products (Forum) by ALF on Mon, Jun 10 2019
  • Re: Beomaster 8000 restoration #3

    Hi John, as always, good to hear from you ๐Ÿ˜ thank you for your advice - point taken ! going through Rudys blogs though it just struck me as ‘one of the things to do’ when a BM8000 restoration is under way?! down here it is not as easy to get access to those parts, so I grab it while I can - yes, the two crystals with two pairs of 18nF caps ๐Ÿค™๐Ÿ˜ will store them just in case. the processor board needs attention: the memory chip seems to no longer does its job as FM stations won’t
    Posted to Vintage Products (Forum) by ALF on Sun, Jun 9 2019
  • Re: Beomaster 8000 restoration #3

    Hi Lonnie, the distortion was in both channels....all fine after I swapped boards. in the meantime I replaced 2IC6 but won’t be able to test until all other boards are done. let’s hope it did the trick ?!! only the processor board to do (i hope) and thinking about changing the two crystals as well while I am at it ?? they should both be short-wired before being put in, right ? will keep all posted ALF
    Posted to Vintage Products (Forum) by ALF on Sat, Jun 8 2019
  • Re: Beomaster 8000 restoration #3

    Just had another look at the SM circuit diagram 1: would it be a good start checking that OP amp 2IC6 ?? that one is handing over the FM signal via P10/pin1 and 4 to the preamp - board #3 P19 ALF
    Posted to Vintage Products (Forum) by ALF on Tue, Jun 4 2019
  • Beomaster 8000 restoration #3

    Hi All, its sometimes really good to have a donor unit at hand..... as today, the fm-signal on the recently restored BM8000 sounded distorted, no matter which station and the volume of that signal was quite loud even at vol setting 1 ?! after checking that other inputs are ok I decided to swapp over the fm-related boards #2 & 1 from the donor unit and everything sounded fine again....๐Ÿ˜๐Ÿ™ but,..... where to look for the most likely problem source on those two boards ?? as I have decided to go
    Posted to Vintage Products (Forum) by ALF on Tue, Jun 4 2019
  • Re: Beomaster8000 repair/resoration

    Well, there is still the BM8000 donor unit........probably another high-speed project ? Not sure yet how much effort is necessary to bring it back to life....we’ll see and if, no doubt there will be posts ๐Ÿ˜๐Ÿ˜ and in between the odd relaxant ๐Ÿท๐Ÿท ALF
    Posted to Vintage Products (Forum) by ALF on Thu, May 23 2019
  • Re: Beomaster8000 repair/resoration

    Hi Lonnie, BINGO ๐Ÿ™๐Ÿค™๐Ÿค— the bloody famous “obvious”.......I can’t believe I missed that one ! yes, volume has been restored - thank you so much. to be honest, i have never looked at those jumpers as they were on all BM8000 I have had so far....... now I learnt something new again and get started with the next project......! thank you to everyone who has tried to help......well and truly a team effort. good to know one is in great company. ALF
    Posted to Vintage Products (Forum) by ALF on Wed, May 22 2019
  • Re: Beomaster8000 repair/resoration

    Back to work.... the no-load adjustment is at about 17mV and the DC offset is about 3.1mV which should not pose any danger ! I also swapped over the connecting cable 4P27 to 3P16 without any impact. again, I looked at the signal at 4P24 pin1 & 6 which remained unchanged during vol increase at around 180mV depending on chassis point. how much more head-scratching can one endure ๐Ÿ™„๐Ÿ˜ฌ๐Ÿ˜ฌ ? as things stand I would pass on the output boards as suspects - it is quite clear to me that these boards actually
    Posted to Vintage Products (Forum) by ALF on Mon, May 20 2019
  • Re: Beomaster8000 repair/resoration

    Nothing visual obviously wrong on the output boards, however I measured the signal (VDC) at 4P24 pin1 and pin6: both were about 170mV unchanged when the volume was turned up or down ! which tells me the output boards basically get nothing worth putting out?! again, is this pointing to faulty vol attenuator ICs ?? Just getting sick of getting fakes from china - wish someone would sell NOS or working used ones .... ALF
    Posted to Vintage Products (Forum) by ALF on Sun, May 19 2019
  • Re: Beomaster8000 repair/resoration

    Thanks John for caring so much..... well, the symptoms are similar to my last “rescue mission” - I crank up the volume to 6 on the scale and can hear a very low signal something you could perhaps experience in a “cross talk situation” when the PH input is selected but idling and a tuner crosstalk signal might be audible at very high vol setting ?! so far I was under the impression that the fault switch would engage if the output amp is faulty or wouldn’t it ?! last time
    Posted to Vintage Products (Forum) by ALF on Sun, May 19 2019
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