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  • Re: Beomaster8000 project

    Intermediate confession......I did replace both trimmers 4R146/246 with the specified value, but did not change anything. now checking that sine wave test signal as suggested.....and replaced 4IC5 and 6. will be back.... ALF
    Posted to BeoGram (Forum) by ALF on Mon, Feb 25 2019
  • Re: Beomaster8000 project

    Yes Martin, thanks - guess I found them - they are ok. ALF
    Posted to BeoGram (Forum) by ALF on Mon, Feb 25 2019
  • Re: Beomaster8000 project

    Had to pause proceedings ☹️ Those ribbon cables are becoming a serious roadblock as I identified a couple of broken wires. I will check the donor unit if they are any better - If not I probably have to get on to Steve an have some new ones done. right now it makes no sense to continue until this problem is out of the way.....also noticed both speaker switches are suspect. next stop seems beolover for some replacement..... well, you never walk alone 🤬 will report back ALF
    Posted to BeoGram (Forum) by ALF on Mon, Feb 25 2019
  • Re: Beomaster8000 project

    Hi John, thanks for coming back to me. good news first: here are the two ebay item #s for those trimmer pots fir the preamp - just type in the numbers on ebay and aa 50pOhm and 25kOhm trimmer comes up # 320529279718 and. # 320685607813 - that should work ! back to the volume issue on my BM8000: yes, I can adjust the vol level with the wheel or remote and the respective numbers come up on the assigned display but I can not hear!! any changes ! two simplified explanations: 1 either the tone/filter
    Posted to BeoGram (Forum) by ALF on Sun, Feb 24 2019
  • Re: Beomaster8000 project

    Brilliant idea with the mp3 sine wave files...should have remembered, as I had a signal generator downloaded on my other PC ! burnt a 1kHZ sine wave test disc...that is the good news - thanks for that genius suggestion. no trouble of seing that sine wave on the scope but not so good when verifying that wave via TP1 input and it certainly does not increase its amplitude 😢 looking at the signal on 4P24 pin 1&6 .... no sign of a clear sine wave 🤬 yes, I also thought about 4IC6 and will check this
    Posted to BeoGram (Forum) by ALF on Sun, Feb 24 2019
  • Re: Beomaster8000 project

    Hi John, some good and bad news to continue...... good: i checked the AD10/278 multiplexer switch pair on PC3 according to block diagram of AF, SM 2-2 and it looks like the switch is working, showing 4.9V respectively and about 30mV at ‘others’....not quite the 0V though !! Bad: finally received those attenuator ICs AD7110KN from Hongkong....put them on sockets but no change to the failing volume issue ?!! checked those voltages associated with the Buffer Amp.....TR201/203/202/204 etc
    Posted to BeoGram (Forum) by ALF on Sat, Feb 23 2019
  • Re: Beocord 8004 recording issues

    Hi Lawrence, no need to be sorry....no issue ever is too simple or basic ! thank you for your genius reply - one should never assume. I have gone almost through the comlete circuit diagram, verifying basically all voltages mentioned... no adverse findings 😳😬 The last thing I suspected would have been the inter-connect, using a 7-pin DiN cable from Steve (sounds heavenly) without any issues during Playback !! So, the suspicion was there: someth8ng is wrong in the deck with the Rec Function ?! using
    Posted to Vintage Products (Forum) by ALF on Thu, Feb 21 2019
  • Re: Beocord 8004 recording issues

    Thanks Greg, indeed it is a one-way cable I used, originally assigned for a Beogram - Beomaster connection. just received a response from Steve clarifying exactly what you suspected. I certainly wasn’t aware of the fact.....one never stops gathering experience. thank you anyway - nice of you to respond. ALF
    Posted to Vintage Products (Forum) by ALF on Thu, Feb 21 2019
  • Re: Beocord 8004 recording issues

    Is it fair to assume not many Beocord users are left among us anymore ?!😳 turning to the Beocord 8004 SM: what I can not find are exact definitions on various testpoints.....what are you supposed to measure ? i noticed in other SMs there are defined voltages one should measure but nothing here unless blindness came over me ?! for example TP7 and TP8 on board 2 ?? so far no adverse findings why the recording function isn’t working ? the PPM works fine in PB mode, flickering up and down but
    Posted to Vintage Products (Forum) by ALF on Wed, Feb 20 2019
  • Re: Beocord 8004 recording issues

    I am waiting for a decent full-size circuit diagram - just wondering whether the BC8002 circuit would be a good start, as it only differs from the BC8004 by not having Dolby C included ?! it doesn’t look like a connection problem after close examination, so......is there a permanent ‘Record Mute’ possible preventing any incoming signal from being recorded or.....is there any source signal coming in at all ? the switch next to the Amplifier DIN plug is “missing” or provisions
    Posted to Vintage Products (Forum) by ALF on Fri, Feb 15 2019
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