<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">My Yamaha CS40M had a similar ”crack” as this rev2. It concerned the EG generators, which went totally cockoo bananas. I thought the ADSR-sliders just needed good cleaning. Continuity checks showed there are no continuity problems. But finally the reason was cracked solder joints on the ADSR-sliders. Probing the joints pushed them enough to create continuity, so it took a while before I realized what was going on.<div><br></div><div>Cha cha cha,</div><div>Antti<br><br><div dir="ltr">Lähetetty iPhonesta</div><div dir="ltr"><br><blockquote type="cite">Michael E Caloroso via Synth-diy <synth-diy@synth-diy.org> kirjoitti 13.5.2023 kello 5.18:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Memorymoog owner since 1986. The first time I opened it up to calibrate the voicecards, the tuning trimpots lifted right off the circuit boards out of their solder fillets.<div><br></div><div>Malfunctions on other gear were cured when I reflowed the fillets.</div><div><br></div><div>Just because the fillets look good doesn't mean they are.</div><div><br></div><div>MC</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 12, 2023 at 1:56 PM Terry Bowman via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space"><br><div><blockquote type="cite"><div>On May 12, 2023, at 5:35 AM, Roman Sowa <<a href="mailto:modular@go2.pl" target="_blank">modular@go2.pl</a>> wrote:</div><br><div><span style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline">A broken track or solder joint is the most difficult fault to find.</span><br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><span style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline">Especially when the PCB is the size of Wyoming with milion solder joints.</span><br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"></div></blockquote></div><div><br></div><div>I used to work cable TV line extenders. There was a Jerrold power supply with a stud mounted bridge rectifier bolted to the chassis. The leads came up through holes on the PC board. The holes had hollow rivets/eyelets to protect the traces. I spent many hours trying to find an intermittent and in the end it turned out to be a loose eyelet. It looked perfect, had a ton of solder on it.</div><div><br></div><div>Or have I told this story before? Hmm...</div><div><br></div><br><div>
<div dir="auto" style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;word-wrap:break-word;line-break:after-white-space"><div dir="auto" style="text-align:start;text-indent:0px;word-wrap:break-word;line-break:after-white-space"><div dir="auto" style="text-align:start;text-indent:0px;word-wrap:break-word;line-break:after-white-space"><div style="color:rgb(0,0,0);letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none">Terry Bowman, KA4HJH<br>"The Mac Doctor"<br></div><div style="color:rgb(0,0,0);letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><br></div><div style="color:rgb(0,0,0);letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><a href="https://www.astarcloseup.com" target="_blank">https://www.astarcloseup.com</a><br></div><div style="color:rgb(0,0,0);letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><br></div><div>"In the land of the blind the one-eyed man is king"—Max Payne<br>"In regione caecorum rex est luscus"—Desiderius Erasmus</div></div></div></div>
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