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  • Re: BM4400 Tuner issues

    Sounds like you have a problem going on there with that overload lamp...... Don't you just love this site....it's like watching one of the Royal Institute Christmas Lectures!
    Posted to The Workbench (Forum) by Craig on Mon, Feb 12 2018
  • Re: Beomaster 3400 - sudden hum from the speakers

    I had something like this some time ago, Peter kindly loaned me his BM4401 to compare with my BM4400 units....at one point while listening to Peters 4401 I noticed a disturbing hum from both speakers, this wasn't there the day before or I would have noticed, I looked at everything like yourself and drew a blank...by chance before I powered down everything I switched off the nearby standard lamp I have in the room and the hum stopped! this is an upright lamp with a transformer feeding several
    Posted to Vintage Products (Forum) by Craig on Mon, Feb 12 2018
  • Re: BM4400 Tuner issues

    Spent an afternoon with the DVM measuring voltages around the muting circuit and did actually find different voltages around the level indictor twin diodes, the voltages did vary as I adjusted the tuning on both units......thinking back to the recent problem I had on my BM6000 and the wrong bulb scenario I decided to pull the Level lamps and have a look, sure enough some clown had replaced one of the level bulbs with a wrong one! (to be honest it was me during the recap exercise as one was blown
    Posted to The Workbench (Forum) by Craig on Sat, Feb 10 2018
  • Re: BM4400 Tuner issues

    Flushed with the result I set up the tining indicator lamps using 3R25 to get them balanced and had a play.....its not perfect but I can now operate the AFC-ST switch and maintain an output, I,m not getting all the stations with the ACF on but I suspect this is due to not having everything set up right as yet. To be sure I was on the right track I installed the suspect bulb into the basket case and sure enough when the AFC-ST is selected all goes quiet...... Martin......I need a couple, make that
    Posted to The Workbench (Forum) by Craig on Sat, Feb 10 2018
  • Re: Bringing a pair of Beovox 5702 back to life...

    Cracking job Dave.......it's good to see your putting your free time to good use ;~) Craig
    Posted to Vintage Products (Forum) by Craig on Thu, Feb 8 2018
  • Re: BM4400 Tuner issues

    Right.....following the great mans advice I have removed the entire train from the problem unit, breaking a single strand black cable into the bargain, and exchanged it for the basket case train.....the problem unit complete with basket case train still refuses to play when AFC-ST switch is depressed, everything else is good, LED indicates a stereo broadcast, S Meter deflects fine.....just no sound. With the problem units train installed the basket case performs great even with the AFC-ST switch
    Posted to The Workbench (Forum) by Craig on Thu, Feb 8 2018
  • Re: BM4400 Tuner issues

    Ok....update on the situation, disconnected the Stereo Decoder & Indicator PC3 and gave it a good check over. No loose pins or wires....so because I can I removed PC3 from the basket case and and connected it to this unit....the problem of everything muting when AFC-ST is switched in continued....this puts PC3 in the clear. Put basket cases PC3 back in its rightful place and checked it still worked, was fine. Replaced the now proven PC3 and removed IF-Section PC2, carried out thorough check of
    Posted to The Workbench (Forum) by Craig on Wed, Feb 7 2018
  • Re: BM4400 Tuner issues

    This is where it is now......not 100% clear but it looks suspect
    Posted to The Workbench (Forum) by Craig on Tue, Feb 6 2018
  • Re: BM4400 Tuner issues

    I think I may have discovered part of the problem.....when recapping this board it looks like I have connected the LED green wire to the wrong place on the board....should be going to pin 5 of IC1 and it looks like I have it plugged into TP7 which is pin 10. see the picture I too before recapping and then as it is right now.....unfortunately I'm at work at the moment so cant check, this will eat at me all day ;¬)
    Posted to The Workbench (Forum) by Craig on Tue, Feb 6 2018
  • Re: BM4400 Tuner issues

    Ok...schoolboy error, swapped both green wires over to the correct pins and now both red LED's respond to (what I believe to be) stereo broadcasts, the LED's fade in and out with the signal strength.....so that's good, however the unit with the good S Meter still goes completely silent when the AFC ST switch is depressed and unlike the basket case unit I cant make the LED go out by adjusting 3C8 in either direction to set the internal oscillator....this is now the only remaining fault
    Posted to The Workbench (Forum) by Craig on Tue, Feb 6 2018
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