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/183775.aspxTue, 17 Feb 2009 07:43:13 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:183775Folke0https://archivedforum.beoworld.org:443/forums/thread/183775.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=30&PostID=183775<p>I think I must rule out the tape head first, before going any further. Exactly&nbsp;how do&nbsp;I measure the coils? Resistance over the two pairs of white/pink cables, as in my illustration?<br /><br />/Folke</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/183443.aspxSun, 15 Feb 2009 15:37:48 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:183443Dillen0https://archivedforum.beoworld.org:443/forums/thread/183443.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=30&PostID=183443<p>Of course you can measure the tapehead coils but defective heads are far between in these decks.</p> <p>The head relay and dolby relay (in some models) is far more likely candidates. Also cracked solders at the tapehead<br />connector, the connectors between the two upper boards and where the ribbon cables meet the lower board.<br />Also any cap in the signal path or even, as stated earlier,&nbsp;the LF353 opamps can be troublesome.</p> <p>Martin</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/183340.aspxSun, 15 Feb 2009 07:33:34 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:183340Folke0https://archivedforum.beoworld.org:443/forums/thread/183340.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=30&PostID=183340<p class="MsoNormal"><span style="font-size:12pt;"><span style="font-family:Times New Roman;">Thanks (again!), Martin! <img src="http://forum.beoworld.org/emoticons/21.gif" alt="Yes - thumbs up" /><br /></span></span></p> <p class="MsoNormal"><span style="font-size:12pt;"></span><span style="font-size:12pt;"><span style="font-family:Times New Roman;">This is a fiendlishly complicated (but wonderful) machine, and I guess I&rsquo;ll have to summon some local help with an oscilloscope...<br /></span></span><span style="font-size:12pt;"><span style="font-family:Times New Roman;">I only wonder if there are any likely suspects I can check? And if it&rsquo;s possible to check the source itself, the tape head?</span></span></p> <p class="MsoNormal"><span style="font-size:12pt;"><span style="font-family:Times New Roman;">&nbsp;</span></span></p> <p class="MsoNormal"><span style="font-size:12pt;"><span style="font-family:Times New Roman;">/Folke</span></span></p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/183315.aspxSun, 15 Feb 2009 04:41:30 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:183315Dillen0https://archivedforum.beoworld.org:443/forums/thread/183315.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=30&PostID=183315<p>Probably a relay contact, a capacitor or a cracked solder somewhere.<br />You will have to put an oscilloscope to the signal path to see where the signal is lost.</p> <p>Recently, I&#39;ve noticed an increasing amount of faults related to the opamps used in these decks.</p> <p>Martin</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/183278.aspxSat, 14 Feb 2009 17:32:00 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:183278Folke0https://archivedforum.beoworld.org:443/forums/thread/183278.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=30&PostID=183278<p><span style="font-size:x-small;"> <p>Hi, all!</p> <p>I just got a BeoCord 8002. It was advertised as &quot;one channel not playing&quot;, and that is exactly the problem. Otherwise it seems to work. Belts are new. When playing a tape, only the Right channel is heard, and only the Right VU-meter will react. The two volume trimpots on the bottom are set one &quot;notch&quot;&nbsp;from the&nbsp;max setting.</p> <p>Is there anything obvious I can check? I have a DTM, and can do some soldering, but have <b>very</b> limited knowledge of electronics...so any help must be very precise, please! I can post pictures where you can draw arrows etc. to guide me... I have the service manual, but it is of very little use to me.</p> <p>I have cleaned the multi-pin contact leading from the tape heads to the PCB, and the relay next to it. Is there a way to measure the tape head, to see if it is faulty?</p> <p>Any help is greatly appreciated!</p> <p>/Folke</p> </span></p><div style="clear:both;"></div>