https://archivedforum.beoworld.org:443/forums/13.aspxThe main Meeting Place for BeoWorld members, and the place for General Questions, Answers and things to say! If you have any questions about anything Bang &amp; Olufsen related - please ask. If you have anything to say - please tell!enCommunityServer 2008 SP2 (Build: 31104.93)https://archivedforum.beoworld.org:443/forums/thread/205624.aspxSat, 23 May 2009 05:39:57 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:205624..........0https://archivedforum.beoworld.org:443/forums/thread/205624.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=13&PostID=205624<p>IIRC there are two sprung metal levers that operate the switch one way or the other, depending on which way you turn the wheel. Have you tried taking it apart and cleaning it? You need to rough up the ends of the metal bits that make contact with the switch as far as I remember! (Its a long time since I have repaired one!)</p> <p>Hope this helps</p> <p>Llewelyn <img src="http://forum.beoworld.org/emoticons/01.gif" alt="Smile" /></p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/205614.aspxSat, 23 May 2009 04:02:49 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:205614MartinM0https://archivedforum.beoworld.org:443/forums/thread/205614.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=13&PostID=205614<p>I have a Master Control Panel 5500 that has a non funtioning volume ring ie. nothing happens when you turn it. All other keys work fine. I&#39;ve installed new batteries; checked the micro switch with a multimeter and appears fine. Having searched the forums, this sounds like not an uncommon fault. However, I&#39;m not sure where to go from here. Could this be a faulty opto sensor? If so, where could I purchase one from? Any other things to try?</p> <p>Thanks</p> <p>Martin</p><div style="clear:both;"></div>