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  • Re: Beogram 4000 carriage control issues

    Hi All, apologies for the long delay but thanks to the corona crisis postal services are slower than a snail's pace. the new glass reed switches finally arrived and were installed in one of the reed relays. That itself wasn't a big issues, however during the "surgery" one of the micro-thin coil wires detached itself from its post ๐Ÿ˜ก so, after micro-surgery I managed to reattach that wire, checked the coil resistance to be sure contact had been established...yes ! time for a test
    Posted to The Workbench (Forum) by ALF on Fri, Apr 16 2021
    Filed under: Beogram 4000 carriage & psu issues
  • Re: Beogram 4000 carriage control issues

    Yes, thank you Martin - that's a possibility ! I ordered a set of the reed glasstube switches as the ohm measurements in ON/Off state are inconclusive. Good lead to follow up. ALF
    Posted to The Workbench (Forum) by ALF on Fri, Apr 2 2021
    Filed under: Beogram 4000 carriage & psu issues
  • Re: Beogram 4000 carriage control issues

    Well, another session with testing components: 0TR1 tested fine and so did all the other transistors from the Power supply board #2 the carriage goes back to its ES but : the BG does not completely turn off - 3IL3/4 are still on !!! as described earlier, when the carriage reaches ES it immediately travels back in a very short distance (about 1cm) there should also be a 24V point at one of the Reed relays ? I measured their coil resistance, showing about 293 ohm. i haven't checked their glass
    Posted to The Workbench (Forum) by ALF on Wed, Mar 31 2021
    Filed under: Beogram 4000 carriage & psu issues
  • Re: Beogram 4000 carriage control issues

    Ok, As one should in a next step, I tried to verify the 6V and 24V supplies are present ! on the main board #1 I have 6V present but the 24V are infact 32V, depending on status ON, arm not lowered or OFF ?? the 24V supply is nowhere to be found: not at C of 2TR7, not at E of 0TR1, not at the SO switch on board and not at 2MS1 (reed relay) on board 2 ??? but isn't 0TR1 generating the 24V for the reed relays ? If so, either 0D1 or 0TR1 must be faulty ? does that sound correct ? thank you once again
    Posted to The Workbench (Forum) by ALF on Tue, Mar 30 2021
    Filed under: Beogram 4000 carriage & psu issues
  • Beogram 4000 carriage control issues

    Hi All, i am sitting over my Beogram 4000 trying to figure out the carriage control issues: just replaced all TO93 transistors in the H-bridge of the motor control circuit - all had issues and the carriage wasn't moving at all. Just wondering how critical it actually is to perfectly match those transistors TR31/30/29/28 ?? transistor TR29 should be a BC144 as per SM, however I only had a BC142 at hand ?! the carriage moves again but is showing some strange behaviour. When it is moving out to
    Posted to The Workbench (Forum) by ALF on Mon, Mar 29 2021
    Filed under: Beogram 4000 repair, Beogram 4000 carriage issues
  • Beogram TX transformer

    Hi everyone, i was wondering if the TX transformer could be replaced by a TX2 transformer with the correct F1 or are there further components to be changed ? on pictures these transformers do look alike. thank you very much for a clarifying reply ๐Ÿค™ ALF
    Posted to BeoGram (Forum) by ALF on Mon, Mar 22 2021
    Filed under: Beogram TX Transformer
  • Re: Beogram TX2 servo adjustment issues

    Hi All, some good news at last after discovering the damage, thanks to an archieved forums post and the right picture ! what happened was the triangular pin on the underside of part 1106 had broken off - difficult to see, especially when you don't suspect to find anything there ๐Ÿ™„ however looking at part 1110 - which grabs the pickup arm from the front - has a spiked arm at the top and at its bottom arm has a triangular hole, fitting through that pin of part 1106, essentially holding part 1110
    Posted to The Workbench (Forum) by ALF on Thu, Feb 4 2021
    Filed under: Beogram TX2 servo adjustment issues
  • Re: Beogram TX2 servo adjustment issues

    No one ?? all parts are present and there seem to be no other way of re-assembleing all ?! ??????? any good idea most welcome ๐Ÿ™๐Ÿค— ALF
    Posted to The Workbench (Forum) by ALF on Wed, Feb 3 2021
    Filed under: Beogram TX2 servo adjustment issues
  • Re: Beogram TX2 servo adjustment issues

    No one ?? all parts are present and there seem to be no other way of re-assembleing all ?! ??????? any good idea most welcome ๐Ÿ™๐Ÿค— ALF
    Posted to The Workbench (Forum) by ALF on Wed, Feb 3 2021
    Filed under: Beogram TX2 servo adjustment issues
  • Re: Beogram TX2 servo adjustment issues

    Hi All, sadly I did not get to the stage of actually testing that newly installed LDR as I can not get the tonearm back in position so its horizontal ?? There are no obvious signs of missing or broken parts according to the explosion drawing in the SM ?? i keep scratching my head why the tonearm is hanging down ? All springs are present and functioning, the black plastic lever is behind the white horizontal bar......what am I missing here ?? the holder - part 1110 - hangs in very loose and the arm
    Posted to The Workbench (Forum) by ALF on Tue, Feb 2 2021
    Filed under: Beogram TX2 servo adjustment issues
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