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</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Sorry.. my mistake.. The shown circuit do not try to charge the battery at all..<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Sorry again. So the battery that is in this Matrix is a very good one still !<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=FR style='font-size:11.0pt;font-family:"Calibri",sans-serif'>De :</span></b><span lang=FR style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Synth-diy <synth-diy-bounces@synth-diy.org> <b>De la part de</b> Jean-Pierre Desrochers<br><b>Envoyé :</b> 7 août 2022 11:22<br><b>À :</b> 'Mike Bryant' <mbryant@futurehorizons.com><br><b>Cc :</b> Synth-diy@synth-diy.org<br><b>Objet :</b> [Polluriel détecté] Re: [sdiy] Oberheim Matrix 6 ---- 3.6v Lithium battery replacement.. or not ?<br><b>Importance :</b> Faible<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>This is what the schematic shows..<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Yes there is a ‘recharge type’ circuit that helps the battery for long term..<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><img width=445 height=271 style='width:4.6354in;height:2.8229in' id="Image_x0020_3" src="cid:image001.png@01D8AA50.E450B630"></span><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=FR style='font-size:11.0pt;font-family:"Calibri",sans-serif'>De :</span></b><span lang=FR style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Mike Bryant <<a href="mailto:mbryant@futurehorizons.com">mbryant@futurehorizons.com</a>> <br><b>Envoyé :</b> 7 août 2022 11:16<br><b>À :</b> Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca">jpdesroc@oricom.ca</a>>; <a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br><b>Objet :</b> RE: [sdiy] Oberheim Matrix 6 ---- 3.6v Lithium battery replacement.. or not ?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>I’d leave it alone if it’s still working fine. On designs back then we often used to leak a few uA into the battery whilst the unit was powered up which kept them living for much longer. Don’t know if this keyboard has that but if so it would explain the long life.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma",sans-serif'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma",sans-serif'> Synth-diy [<a href="mailto:synth-diy-bounces@synth-diy.org">mailto:synth-diy-bounces@synth-diy.org</a>] <b>On Behalf Of </b>Jean-Pierre Desrochers<br><b>Sent:</b> 07 August 2022 15:33<br><b>To:</b> <a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br><b>Subject:</b> [sdiy] Oberheim Matrix 6 ---- 3.6v Lithium battery replacement.. or not ?<o:p></o:p></span></p></div></div><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:black'>Hi all,<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>A friend of mine brought me a working Oberheim Matrix 6 keyboard<br>that he was worried about the inner memory lithium battery (BR2032)<br>being about to die.. and to replace it.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Well after a quick check the battery was still in pretty good physical condition (no leakage)<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><img border=0 width=200 height=184 style='width:2.0833in;height:1.9166in' id="Image_x0020_5" src="cid:image002.jpg@01D8AA50.E450B630"></span><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><br>and was showing a strong 3.23v on its terminal (AC unconnected)<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>So.. In this situation I’m wondering if this lithium cell should be replaced or not.<br>I know this keyboard is at least 30-40 years old and many of the coin<br>batteries of these vintage keyboards need to be replaced, but..<br>And on replacement I thought about soldering a coin battery socket<br>on the PCB pads BUT the battery placement on the PCB<br>is very close to some IC’s as shown on the picture and<br>would need the socket to be raised a little to avoid these IC’s.. I don’t like that.<br>I could also buy a coin battery with PCB legs too like this one<br>but again, replacement or not ?<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><img border=0 width=219 height=183 style='width:2.2812in;height:1.9062in' id="Image_x0020_6" src="cid:image003.jpg@01D8AA50.E450B630"></span><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>I don’t know the year of manufacture of this Matrix but here are<br>the serial number and BIOS number.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>SN: 7622661<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>BIOS: M6R 2.13<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Your opinions are very welcomed.<br>Cheers !<br>Jean-Pierre <o:p></o:p></span></p></div></div></div></body></html>