<html><head></head><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:13px"><div id="yui_3_16_0_1_1456598489964_4768"><span id="yui_3_16_0_1_1456598489964_4825">I have seen this issue before as well Richie. The ground trace, to the 1/4" chassis mount connector, is susceptible to excess current and can become an open-circuit rather easily. </span></div><div></div><div id="yui_3_16_0_1_1456598489964_4769"> </div><div class="signature" id="yui_3_16_0_1_1456598489964_4785"><div id="yui_3_16_0_1_1456598489964_4784"><font size="2" id="yui_3_16_0_1_1456598489964_4893">Sincerely, <br> </font></div><div id="yui_3_16_0_1_1456598489964_4787"><font size="2" id="yui_3_16_0_1_1456598489964_4786">Chris Juried <br>Audio Engineering Society (AES) <var id="yui-ie-cursor"></var>Member <br>InfoComm-Recognized AV Technologist</font><span class="postbody" id="yui_3_16_0_1_1456598489964_4789"><br><a rel="nofollow" target="_blank" href="http://www.juriedengineering.com/" id="yui_3_16_0_1_1456598489964_4788">http://www.JuriedEngineering.com</a> (Juried Engineering, LLC.)</span></div><div id="yui_3_16_0_1_1456598489964_4802"><font size="3" id="yui_3_16_0_1_1456598489964_4807"><font size="2" id="yui_3_16_0_1_1456598489964_4806"><br><br>This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. 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If you have received this email in error, please immediately notify me at (754) 300-9972 and permanently delete the original and any copy of any e-mail and any printout thereof.</font></font><br></div></div><div class="qtdSeparateBR" id="yui_3_16_0_1_1456598489964_4861"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_1_1456598489964_4865" style="display: block;"> <div style="font-family: verdana, helvetica, sans-serif; font-size: 13px;" id="yui_3_16_0_1_1456598489964_4864"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1456598489964_4863"> <div dir="ltr" id="yui_3_16_0_1_1456598489964_4862"> <font size="2" face="Arial" id="yui_3_16_0_1_1456598489964_4892"> <hr size="1" id="yui_3_16_0_1_1456598489964_4891"> <b id="yui_3_16_0_1_1456598489964_6197"><span style="font-weight:bold;" id="yui_3_16_0_1_1456598489964_6196">From:</span></b> "rburnett@richieburnett.co.uk" <rburnett@richieburnett.co.uk><br> <b><span style="font-weight: bold;">To:</span></b> Jean Bender <lofideadbeat@gmail.com> <br><b><span style="font-weight: bold;">Cc:</span></b> synth-diy DIY <synth-diy@dropmix.xs4all.nl><br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, February 27, 2016 9:12 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [sdiy] Advices for restoring an old Roland SH2<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1456598489964_4866"><br>Maybe someone has plugged it into a faulty "live" valve amplifier or <br clear="none">something and it has burned off the ground trace to the line out jack on <br clear="none">the back of the synth. That's what I think had happened to my SH-09 <br clear="none">when I got it. The ground trace to the line out jack was completely <br clear="none">vaporised off the little board that the jacks are mounted on. The only <br clear="none">thing I can imagine that would cause that kind of damage is having mains <br clear="none">power plugged into it somehow. Fortunately soldering a wire along the <br clear="none">route of the previously fused track, brought the line out jack back to <br clear="none">life and removed the 50Hz buzz from the output.<br clear="none"><br clear="none">It's quite a thin trace from what I remember so probably wouldn't take <br clear="none">THAT much current to burn it open-circuit. I'm sure things would have <br clear="none">been different if the jack sockets had been electrically connected to <br clear="none">the chassis, instead of having little plastic insulating washers around <br clear="none">them where they pass through the metal enclosure.<br clear="none"><br clear="none">-Richie,<br clear="none"><br clear="none">On 2016-02-27 13:28, Jean Bender wrote:<br clear="none">> Hi !<br clear="none">> <br clear="none">> I've got a Roland SH2 to fix. It's working propoerly, except a "buzz"<br clear="none">> that appear around the 50hz : this buzz is always here once the synth<br clear="none">> plugged. I imagine a problem around the power distribution ? I should<br clear="none">> chek all the caps and replace some of them ?<br clear="none">> <br clear="none">> Also, the main output has no gain, and i have to use the headphone<br clear="none">> output. Would somebody have an idea about that ?<br clear="none">> <br clear="none">> Thanks for any advice or answer !<br clear="none">> Best.<br clear="none">> J.<br clear="none">> _______________________________________________<br clear="none">> Synth-diy mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Synth-diy@dropmix.xs4all.nl" href="mailto:Synth-diy@dropmix.xs4all.nl">Synth-diy@dropmix.xs4all.nl</a><br clear="none">> <a shape="rect" href="http://dropmix.xs4all.nl/mailman/listinfo/synth-diy" target="_blank">http://dropmix.xs4all.nl/mailman/listinfo/synth-diy</a><div class="yqt3042034232" id="yqtfd08552"><br clear="none"><br clear="none">_______________________________________________<br clear="none">Synth-diy mailing list<br clear="none"><a shape="rect" ymailto="mailto:Synth-diy@dropmix.xs4all.nl" href="mailto:Synth-diy@dropmix.xs4all.nl">Synth-diy@dropmix.xs4all.nl</a><br clear="none"><a shape="rect" href="http://dropmix.xs4all.nl/mailman/listinfo/synth-diy" target="_blank">http://dropmix.xs4all.nl/mailman/listinfo/synth-diy</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>