https://archivedforum.beoworld.org:443/forums/30.aspxA Forum for Technical Help and Support on Bang & Olufsen products over 25 years old.enCommunityServer 2008 SP2 (Build: 31104.93)https://archivedforum.beoworld.org:443/forums/thread/280368.aspxFri, 11 Jun 2010 16:27:12 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:280368JonR0https://archivedforum.beoworld.org:443/forums/thread/280368.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=30&PostID=280368<p>Hi Andy</p> <p>Many thanks, I&#39;ll look into upgrading and getting the service manual - might be the way to go here. </p> <p>Jon</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/280354.aspxFri, 11 Jun 2010 14:50:43 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:280354Jandyt0https://archivedforum.beoworld.org:443/forums/thread/280354.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=30&PostID=280354<p>Hi Jon. <br />I&#39;m not a techie, but I just had a look at the service manual, and there appears to be 4 internal fuses.<br />The manual is on site, but you need to upgrade your membership to download it.</p> <p><strong><em><span style="font-family:times new roman,times;font-size:small;">Andy T.</span></em></strong></p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/280318.aspxFri, 11 Jun 2010 11:02:44 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:280318JonR0https://archivedforum.beoworld.org:443/forums/thread/280318.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=30&PostID=280318<p>Hi </p> <p>Bit of a shot in the dark, but I was wondering if anyone knew if the B&amp;O 4500 master amp has an internal fuse or perhaps a power relay that could have got stuck? It has been working perfectly for two + years, I went away for a two week holiday, turned it off from the wall socket power so the whole system was compeletly off (something I hardly ever do) came back, switched it on, and nothing. Dead, no usual click as it switches into standby, no red lights behind the glass of each of the units. I checked the plug socket fuse and power is going in, which made me think perhaps it could be a stuck relay or perhaps the unit has an internal fuse. Any suggestions would be greatfully received... the mystery is it was working fine, was not touched, and then I simply switched the power to it on the main wall socket and nothing... </p> <p>Regards</p> <p>Jon</p><div style="clear:both;"></div>