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  • Re: Beocenter 1400 burning fuses

    Finally got time to replace the trimmers as well... but no luck! New trimmer had no effect on the left channel, i.e. the idle voltage is still around 750mV and the trimmer has no noticeable effect on it at all. What next ? On the brighter side, I also have a wreck of a Beomaster 5500 which had one channel burning the fuses. After the (partially) encouraging
    Posted to The Workbench (Forum) by jrantala on 03-23-2011
  • Re: Beocenter 1400 burning fuses

    OK, thanks, I'll try that. However, I did measure the trimmers (in-circuit) and they seemed to be OK (range ca. 0-870 Ohms) on both channels. -jari
    Posted to The Workbench (Forum) by jrantala on 03-10-2011
  • Re: Beocenter 1400 burning fuses

    Partial success!? Changed all 5 transistors, 4 diodes, the 2 big resistors and 4 capacitors of left channel. At least 2 diodes were blown (as well as the output darlingtons), cannot say about the driver darlington as couldn't get it out in one piece. Now the fuses stay OK when I power up, the 32V is OK but I cannot adjust the idle current on that
    Posted to The Workbench (Forum) by jrantala on 03-10-2011
  • Re: Beocenter 1400 burning fuses

    Here is a close-up of the left channel components. A number of caps and a trimmer has been changed sometimes, too. Going to change all the caps anyway, and comparing with the other channel (assumed to be OK) all suspect components around the output stage. On the power darlingtons: from some charts on the internet I found recommendations to use BD652
    Posted to The Workbench (Forum) by jrantala on 03-06-2011
  • Re: Beocenter 1400 burning fuses

    DIN socket and solder tags look OK to me. Checking around it seems that at least the driver transistor and trimmer of left channel need replacing... actually looks like a lot of the components have been changed/tampered with! Here is a photo of the transistors, BD899/BD910 pair on the right (left channel, the bad one) and TIP125/TIP120 pair on left
    Posted to The Workbench (Forum) by jrantala on 03-05-2011
  • Re: Beocenter 1400 burning fuses

    Thanks Martin, turns out to be blown output transistors. Any recommendations what to use instead of the original BD697/BD698 Darlingtons, which are no longer available (not easily, anyway) ? As a matter of fact, in my kit these transistors are not originals - they have been replaced with BD899/BD910 and TIP125/TIP120 pairs. -jari
    Posted to The Workbench (Forum) by jrantala on 03-05-2011
  • Beocenter 1400 burning fuses

    Hi all, I just got an old Beocenter 1400 with a problem: it has blown its fuses and with new ones, after connecting mains gives a short rumble from speakers then blows fuses again (these are the mains fuses, not the tape deck one). Does this sound like a capacitor/trimmer job (much too high idle current) ? Before looking deeper into its components,
    Posted to The Workbench (Forum) by jrantala on 03-04-2011
  • Re: Trying to use Beocord VHS91.2 as an audio recorder

    Update - I tried with a Beomaster 6000 connected to the VHS91.2, and the recording levels were now OK in this configuration. So it was the old DIN level connections in the BM1001 that were to blame! But now I have loud, low frequency rumble in the recordings. PSU caps in VHS91.2 or something else ? Any guesses ?
    Posted to Vintage Products (Forum) by jrantala on 03-03-2011
  • Re: Remote controls on Beomaster 6000 (the "new" one)

    Yes, I know that they are the "correct" remotes for the BM6000 but I have understood that the Beocenter remotes also should work - at least partially. Am I totally mistaken here ? -jari
    Posted to Vintage Products (Forum) by jrantala on 02-23-2011
  • Remote controls on Beomaster 6000 (the "new" one)

    I have an old Beomaster 6000 ("new", not the old 4ch one!) which I am restoring right now, and have a question on the IR remote control. Should a Beocenter Control Module (for Beocenter 7000) work for this or not ? I have one and it doesn't (and it does work with my Beocenter 7000 though). In an old thread I just read that it should work
    Posted to Vintage Products (Forum) by jrantala on 02-23-2011
Page 5 of 6 (53 items) « First ... < Previous 2 3 4 5 6 Next >
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