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  • Re: Master Control Panel 5500 Knob and Sensor

    This knob is now on Thingiverse!
    Posted to The Workbench (Forum) by Keri on Tue, Feb 23 2021
  • Wicon Capacitor replacement

    Hello This thread is for suggestions and methods discovered for replacing the obsolete Wicon capacitors in many B&O models. Wicon capacitors tend to be differently sized than modern equivalents, and sometimes have odd terminal arrangements, such as a 3rd "blank" terminal for physical support. Also, many B&O products have specially designed mounting arrangements specific for these now-obsolete capacitors. Here's some methods I used when rebuilding a Beocenter 7700. In particular
    Posted to The Workbench (Forum) by Keri on Fri, Feb 19 2021
  • Re: BEOMASTER 6500 does not start up - one error found

    Hi 69er I would hold off on the two big caps for now, they are not used during Standby. You say the relay opens upon attaching power to the unit. This is the normal Standby state of the relay 2RL1. The microprocessor system must de-energize this relay to turn the system ON. At this point, the two large 10,000uf capacitors come into play. In particular, p-14 pins 1,2,3,4,5 and 9 seem most relevant to Standby. You say pin p-14-4 is at 18v. I believe it should be at 8v. You did not say what p-14-2 is
    Posted to The Workbench (Forum) by Keri on Sun, Jan 17 2021
  • Re: BEOMASTER 6500 does not start up - one error found

    On the microproccesor board, Board 4, inside of the metal can are two electrolytics. One appears to have a tendency to explode, capacitor 4C1. The one that didn't explode is a 33uf axial designated 4C10, 4C10 is responsible for "startup reset", without which the CPU won't start. It is located right next to 4IC3, and on the systems I have worked on they have all degraded seriously without exploding or showing any visible degradation. In particular, on my system that would not start
    Posted to The Workbench (Forum) by Keri on Tue, Jan 12 2021
  • Re: B&O cd 5500 motor spinning like crazy

    Hello... I just got a Beogram CD 5500 working, so maybe my thoughts might help. First thing I noticed on your video is that it sounds like the CD is hitting the tray. This will stop the player from reading the disc until it finally gives up. The rubber suspension for the mechanism is probably badly degraded. Although the suspension does have provision for height adjustment, it probably won't be enough. Beoparts does sell a repair kit for this. What I would do before ordering it is to adjust up
    Posted to The Workbench (Forum) by Keri on Wed, Jan 6 2021
  • Re: Beomaster 5500 humming in standby and turned on

    I don't know what your level of ability is but here is my suggestions. First, unless you are actually working on it to repair this, immediately unplug it from the mains! The Beomaster 5500, like the BM5000 that preceded it as well as several other models all utilize a similar standby system which is normally silent. The Standby mode in these systems utilize a separate low voltage power supply for Standby and some other functions, while the Main power system mostly powers up the amplifier and
    Posted to The Workbench (Forum) by Keri on Sun, Jan 3 2021
  • Re: BEOMASTER 6500 does not start up - one error found

    Any luck on getting the 5.1v fixed? The schematic in my preceding post shows some related voltages to check. It is unlikely to work correctly with only 4.25V, though something might operate, or operate erratically... Also, it's possible that something is dragging the 5.1v down to 4.25v somewhere else, like maybe the processor board. Speaking of which, did you check both electrolytics? The startup capacitor 4C10 doesn't have to explode in order to fail. The Main relay will normally pull in
    Posted to The Workbench (Forum) by Keri on Sun, Jan 3 2021
  • Re: What Are You Working On Now

    Almost two years ago I ran across an odd posting on Craigslist... Beomaster 1900 for sale - $0.00 So I called, spoke with and met with the owners of a broken Beomaster 1900 that wanted to find it a good home, and not to just be scrapped or recycled. The sale for Zero money had one condition, that I at least try to repair it and find it a good home. I accepted the challenge. They seemed relieved that I had previously restored a Beocenter 7700 and showed them pictures and a video of it. So back home
    Posted to The Workbench (Forum) by Keri on Wed, Dec 30 2020
  • Re: BEOMASTER 6500 does not start up - one error found

    3v AC? Uh Oh! connecter P14 pin 5 (oops, not 2) should have something like 5.1V DC on it. My main computer with pictures on it doesn't upload to this forum very well.... let me see if I can put up the schematic. There! Schaltplan! If you are getting significant AC on P14 pins 1,3 or 5 you've got trouble! Should be around 5.1V DC.
    Posted to The Workbench (Forum) by Keri on Tue, Dec 29 2020
  • Beogram 4002 PCB 3 Repair PN 8005019 plus restoration

    Some friends of mine really liked my Bang & Olufsen stuff... so much so, they adopted my Beomaster 1900 and set out to acquire a Beogram 4000 series. They obtained a cosmetically great Beogram 4002 from the original owner and it arrived very well packaged in an undamaged box... BUT..... Upon an initial inspection it looks like it had a rough ride at some point! The question mark shaped PCB #3 has been shattered, apparently by being struck by the lower platter. As the Beogram is in very good cosmetic
    Posted to The Workbench (Forum) by Keri on Mon, Dec 28 2020
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