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ARCHIVED FORUM -- April 2007 to March 2012
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This is the first Archived Forum which was active between 17th April 2007 and 1st March February 2012

 

Latest post 09-19-2007 3:14 AM by Peter. 1 replies.
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  • 09-18-2007 6:07 PM

    • ScottMc
    • Not Ranked
    • Joined on 06-12-2007
    • Ayrshire
    • Posts 37
    • Bronze Member

    BM 1900 wierd problem

    hi folks,

    i'm having a strange intermittent problem with the volume controls on my BM1900-1. Basically one day i turned it on and the valume started at the preset normal level but then instantly started decreasing to zero. this happens regardless of whether tape/phono/radio is selected.

    I turned the unit off and then back on and the same happened. i left it overnight and in the morning it was fine, unfortunately a couple of days later it started doing it every time it was turned on.

    this started around 2 years ago - at the time i took the beomaster and wiring diagrams to the local tv repair shop (he had a lot of vintage radios in the window and i also noticed a Beo-Ouverture in the shop so i thought he'd do a decent enough job of fixing it.

     After 2 months of it in the shop he returned it to me still not repaired claiming he could not understand what was wrong with it. In the mean time i had bought a new beomaster 3300 (subsequenty replaced by my BC8500) - the 1900 was then put away in a box for around a year until i moved house.

     whilst unpacking after the move i plugged it in and amazingly everything seemed to be working perfectly. this continued for weeks and so i bought a pair of CX50's for it and set it up in my study.

    one night whilst the speakers were unplugged i had turned up the volume to maximum on the unit, the volume display reached the maximum and then cut straight back to zero. i turned the unit off and back on again and guess what..... the fading volume problem had started again.

     I really like my 1900 as it was the first B&O i bought - i don't really want to have it sent off for weeks again to another repair shop only for them to scratch their heads as to the problem!

     

    has anyone here had a similar problem and is there an easy fix? all the functions on the system appear to be working perfectly it is just the volume continually decreasing that is the problem.

  • 09-19-2007 3:14 AM In reply to

    Re: BM 1900 wierd problem

    Martin is the expert here but I would suspect that you have a fault with some sort of loose contact with the volume control circuit. The volume control seems very complicated (I am not that technical!) but essentially seems to rely on a photo sensitive cell and some bulbs in a box. (I told you I was not technical!) Failure of one of these bulbs gives symptoms similar to those you describe. My 2400 developed a fault where it would suddenly go to full volume. The fact yours seems intermittent suggests loose contact or cracked solder rather than actual bulb failure.

    I am sure Martin will have a considerably better and more technical reply though! Laughing

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