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/218410.aspxWed, 29 Jul 2009 01:59:08 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:218410Dillen0https://archivedforum.beoworld.org:443/forums/thread/218410.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=13&PostID=218410<p>Welcome to Beoworld !</p> <p>Generally, if the MCP lights up when you rotate the wheel, the contact is fine and the opto is dead<br />but the contacts are easily checked with an ohm-meter (MCP batteries removed) and also easily<br />cleaned. If the contacts are OK, the opto component is probably bad.<br />Light output degrades with age, I&#39;ve replaced a handful or so by now.</p> <p>Martin</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/218402.aspxTue, 28 Jul 2009 20:52:15 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:218402Jhncall0https://archivedforum.beoworld.org:443/forums/thread/218402.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=13&PostID=218402<p>I have a bit of a problem any help would be appreciated.The sound ring on the 5500&nbsp;control panel&nbsp;is not working, could the problem be with the contacts and if so can they be cleaned without too much difficulty??</p> <p>&nbsp;</p> <p>Thanks, </p> <p>John</p><div style="clear:both;"></div>