My roland KR-350 Made in 1993 must be a secret design!

[Musicman1101]

I have searched high and low and cannot find a schematic, I've had some very experienced senior heavy weights looking too and have not come up with anything. I would really appreciate any technical data on it. The transformer was missing when I got it, so I am working on power supply and will be recapping the whole thing. It would sure be nice to have a understanding of the 5 volt reset circuit. Thanks for looking!

[sugeda]

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[Enzo]

When you don't have documents, a transformer can be aproximated by looking at power supply. If the main filters are 63v caps, likely the power supplies are like 50-55vDC, And your low level circuits most likely work on 15v rails, sometimes 12v.

[J M Fahey]

Agree and add: even if it needed 55 and you gave it 50 or viceversa, you (or your customer) won´t be able to tell difference by ear anyway.

[Musicman1101]

Thanks a bunch guys and ladies! I almost tipped over in my chair when I seen the link at the bottom of Mr. Sugeda's reply! I thought "could it really be? And it was. So a big thank you to you Sugeda ! Sometimes the loudest words are never spoken! You rock!