osculator alignment

General Discussions concerning modifications to the Roland Jupiter series analogue synthesizers
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CasioKorg
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osculator alignment

Postby CasioKorg » Wed Aug 15, 2007 2:07 am

i was wondering how this is done?

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sjones
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Postby sjones » Wed Aug 15, 2007 6:07 pm

Typically this is done by pressing the 'tune' button after the unit has had 10 to 15 minutes of warm up time. If its still not in tune, and you are sure you have the proper front panel settings for a basic patch, then you can use the service manual as a guide for the scaling procedure. But even before you do that, you may want to get someone who knows a bit about electronics to check the interconnects and socketed chips. Sometimes just gently pressing down or reseating the chips can clear up a wildly out of tune synth.

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CasioKorg
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Postby CasioKorg » Wed Aug 15, 2007 11:12 pm

is this typically the way to do it on every synth?

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sjones
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Postby sjones » Thu Aug 16, 2007 2:21 am

More or less. Some analogues will auto tune when the keyboard is on but not being used. Some only tune at start up. Some tune only at start up and when the user tells it to. As far as scaling is concerned, the procedure varies from instrument to instrument, but usually involves trimming variable resistors (trimmers) either with visual or aural feedback. A scope isn't always necessary, but for some procedures its necessary. Check with your service manual.

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CasioKorg
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Postby CasioKorg » Thu Aug 16, 2007 6:20 am

cool thanks! im reffering to a korg poly 61m, not a jupiter. but alas, your advice worked! i twisted the tune knob for a while, and it seems to have fixed it :P

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Bross
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Postby Bross » Sat Jan 17, 2009 11:08 pm



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