Yamaha CS80

Hi Joachim

Yes the reality is slightly different, but it's effectively the same thing.
A resistor to compensate is probably the way forward.

I'm just getting to grips with the larger Yamaha CS series recently. 
I've done a lot of different synths over the years, but never got my 
hands dirty on a CS50/60/80 until recently. Now I seem to have them 
coming at me from all sides.

Let me know if the resistor addition sorts out the issue.

Bob
On 19/05/2013 16:29, joachim.milson wrote:
>
> >Occasionally I've come across PTH where the plating has become damaged
> and the two sides of the board are no longer connected.
> This PCB is printed on one side only. Its lower side is in direct
> contact with the metal plate on which it is screwed.
>
> > It could well be that the resistive print in that area is faulty
> either due to wear and tear, or just plain old age.
> That's what I fear. I'm surprised however that only this part of this
> board is concerned.
>
> > Looking at the service manual it suggests that on either side of the
> contact resistor (topologically speaking) are some resistors.
> The overall circuit diagram seems wrong. Look here for what could be a
> more faithful diagram AT-sensor resistors
> <http://groups.yahoo.com/group/yamahacs80/photos/album/1863574374/pic/12\
> 73145453/view 
> <http://groups.yahoo.com/group/yamahacs80/photos/album/1863574374/pic/1273145453/view>>
>
> > If you're feeling brave you try adding a new resistor into the path to
> compensate for the error?
> I'll probably try that between T3 and -15.
>
> Thanks,
>
> Joachim
>
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>
> 



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