https://archivedforum.beoworld.org:443/forums/42.aspxAdvanced Technical Forum for discussion of Bang & Olufsen products at component level.enCommunityServer 2008 SP2 (Build: 31104.93)https://archivedforum.beoworld.org:443/forums/thread/350748.aspxSun, 18 Dec 2011 13:24:04 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350748Step10https://archivedforum.beoworld.org:443/forums/thread/350748.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350748<p>Martin has just told me it is in fact 330k 10%. I have to go eat my socks now :)</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/350745.aspxSun, 18 Dec 2011 12:52:10 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350745Step10https://archivedforum.beoworld.org:443/forums/thread/350745.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350745<p>Ah grey (8)&nbsp; orange(3) yellow(1x10<span style="font-size:xx-small;"><i>4</i></span>) would be 830k but silver is a multiplyer only (and tolerance) so that would possibly indicate 0.43R which again is worse than what you have now.</p> <p>84k seems way too high IMO.</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/350742.aspxSun, 18 Dec 2011 12:36:47 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350742richtoy0https://archivedforum.beoworld.org:443/forums/thread/350742.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350742<p>Now I look at in in another light it could be grey yellow orange which would be 84k ohm <img src="http://forum.beoworld.org/emoticons/37.gif" alt="Confused" />&nbsp;</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/350740.aspxSun, 18 Dec 2011 12:27:23 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350740richtoy0https://archivedforum.beoworld.org:443/forums/thread/350740.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350740<p>It was a typo,&nbsp;&nbsp;I meant 94k ohm&nbsp;(should have proof read my post)&nbsp;</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/350738.aspxSun, 18 Dec 2011 12:12:49 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350738Step10https://archivedforum.beoworld.org:443/forums/thread/350738.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350738<p>You are far better going too low than too high! If emailing Martin (Dillon) doesn&#39;t come up with an answer and you want to find the highest resistance that will trigger the protection circuit (very important when choosing your NTC) then you could use a potenitometer in circuit turn from high to low and determine the cutoff resistance. Then choose a suitable ntc not from it&#39;s advertised value but it&#39;s &#39;resistance @ 80C&#39; specs as an example.</p> <p>BTW how did you get 84k???</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/350730.aspxSun, 18 Dec 2011 10:55:42 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350730richtoy0https://archivedforum.beoworld.org:443/forums/thread/350730.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350730<p>Well its colours are Grey, Yellow, Orange which I suppose would indicate 84k if it&#39;s the same as normal resistors.&nbsp; Google only has a little information.&nbsp; I will try my local shop tomorrow...</p> <p>Richard</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/350729.aspxSun, 18 Dec 2011 10:43:01 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350729Step10https://archivedforum.beoworld.org:443/forums/thread/350729.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350729<p>Ah ok sorry mate well looking at the circuit I would go for a 1k ntc.</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/350726.aspxSun, 18 Dec 2011 10:17:16 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350726richtoy0https://archivedforum.beoworld.org:443/forums/thread/350726.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350726<p>The Beomaster starts and runs fine with the thermistor R160 removed.&nbsp; Its value at room temperature is only 52 ohms which I think is low and would explain the behaviour I am seeing when it is in circuit.&nbsp; Does anybody know the correct type or which other models similar ones were fitted to?&nbsp; I have looked through my Beomaster graveyard but have found nothing similar yet...</p> <p>Richard</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/350668.aspxSat, 17 Dec 2011 13:07:59 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350668Step10https://archivedforum.beoworld.org:443/forums/thread/350668.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350668<p>I would personally look at the transistors associated with the protection circuit! You could disconnect one end of the ntc and see if that makes a difference. Have you checked all the transistors with a meter?</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/350663.aspxSat, 17 Dec 2011 12:25:42 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:350663richtoy0https://archivedforum.beoworld.org:443/forums/thread/350663.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=350663<p>Does anybody know the typical value for R160 in a BM3300? &nbsp;It&#39;s the NTC thermistor in the power fail circuit.</p> <p>The receiver has had new amp module and been re-capped but the power fail keep activating at startup <img src="http://forum.beoworld.org/emoticons/06.gif" alt="Sad" /></p> <p>The voltage values around across the load resisitors R218 &amp; R418 look good i.e. 0v which really only leaves the bias on TR33...</p> <p>Thanks</p> <p>Richard</p><div style="clear:both;"></div>