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I found quite a few by searching the Korg part numbers for common parts, they are listed in the service manual and show up in google searches. For some reason scribd has a lot of technical documents, but almost everything is on Internet Archive for free. You
 can sometimes find behringer and other manuals by searching the pcb name/number. P0CQJ will give you the Model-D early revision schematics.   </div>
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<b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Jason Dickson via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> Friday, 30 October 2026 6:58 PM<br>
<b>To:</b> Mike Beauchamp <list@mikebeauchamp.com><br>
<b>Cc:</b> SYNTH DIY <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Korg Volca Bass service manual</div>
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<div style="direction: ltr;">Where does one obtain the service manuals for the volcas? Mine are aged now and I intend to redo all the button contacts rhat manual would be helpful </div>
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<div style="direction: ltr;">On Fri, Oct 30, 2026, 10:45 AM Mike Beauchamp <<a href="mailto:list@mikebeauchamp.com" id="OWAaefea868-1b1f-c4ce-f38e-573b7ce1f7cf" class="OWAAutoLink">list@mikebeauchamp.com</a>> wrote:</div>
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<div>I wasn't expecting to see a service manual with full schematic for a<br>
budget synth. Pretty impressed with Korg for doing this.. do they do<br>
this for all of their modern synths?<br>
<br>
Mike<br>
<br>
<br>
On 2026-10-26 17:00, Sean Ellis via Synth-diy wrote:<br>
> <a href="https://cdn.hackaday.io/files/1698407266434560/korg_volca_bass_sm.pdf" id="OWA281bc5ec-eac7-9288-8bb6-a03f4fc0c563" class="OWAAutoLink" originalsrc="https://cdn.hackaday.io/files/1698407266434560/korg_volca_bass_sm.pdf" data-auth="NotApplicable">
https://cdn.hackaday.io/files/1698407266434560/korg_volca_bass_sm.pdf</a><br>
> <<a href="https://cdn.hackaday.io/files/1698407266434560/korg_volca_bass_sm.pdf" id="OWA7d67fc62-8f90-f8c5-bbb7-74775e72e5a7" class="OWAAutoLink" originalsrc="https://cdn.hackaday.io/files/1698407266434560/korg_volca_bass_sm.pdf" data-auth="NotApplicable">https://cdn.hackaday.io/files/1698407266434560/korg_volca_bass_sm.pdf</a>><br>
><br>
> Not sure if this has been shared but here's the manual, as usual some<br>
> interesting circuits from Korg. Schmitt-trigger in the VCO and a very<br>
> low parts count on the VCF, not a trimpot on board! Has anyone heard one<br>
> of these? I'd be interested in how the filter sounds.<br>
><br>
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