Whoa! That is incredible background info. So if we've never replaced those caps, would our?CS-80s have these minerals of conflict? If so, it would be my only keyboard that has a scandalous reputation, ha!?
Well, I have no background history on it when Roy Orbison owned it, Who knows the things that might've gone on around it when he had it in his studio!
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On Jan 9, 2017, at 7:13 PM, David Rogoff
david@... [yamahacs80] <
yamahacs80@...> wrote:
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Speaking of replacing caps. ?For years, I’ve replaced tantalums whenever working on old gear because of their problems like exploding. ?There’s one-per-note on the TSB boards. ?I just read in ?that there’s another important reason:
I had no idea they were connected with conflict minerals!
And I also didn’t realized what this did to the price when companies switched to non-conflict sources a few years ago:
?David
Hi Tom,Thanks for pointing these issues.You're right concerning the 100uF capacitors. There are 4 decoupling capacitors; two between ground and +15V, and two between ground and -15V. I changed the 33uF one near the IC1 to a 100uF, and I added a new 100uF one near the IC3 (which corresponds roughly to where it really lies on the board).As for the 4.7uF capacitors, those on my boards are in compliance with the schematics. Two are polarized and are yet other decoupling capacitors (between -15V and +15V, this time). The other two are non polarized and are located near IC8 and IC9.I updated the overall circuit diagram to reflect these. It is available?.I also put in the photo gallery of the CS80 group a copy of the M-board schematic (p44 of the service manual) where I highlighted the 42 capacitors, and also fixed a couple of missing components and a label inversion (fixed in red). You can find it?.Joachim?
