Hi Matt.
The first two issues are probably alignment issues (VCA and Envelope). I'd
go through a full calibration before I start changing stuff.
C# ping is odd, but if it's just happening on start up it may be nothing to
worry about.
These machines (according to the manual) take 20-30 seconds from switch on
to settle to a playable state.
Is the Hum a 60hz kind of hum?
Could be you have a loose earth connection somewhere.
Dead presets is very odd, as they're all set by passive means. Check the
preset boards just in case someone has depopulated them, or wires have come
off.
Small green caps should be OK. Problem caps are tantalums and
electrolytics. I don't think the green caps are either of these, but I'd
need to double check the service manual. That's not to say other types
don't go wrong. They can, but it's unusual.
B
On Monday, June 10, 2013, velomatte wrote:
> ∗∗
>
>
> All,
>
> So after re-capping and re-CMOS-ing the power supply, SH and replacing the
> SUB board I was able to tune the CS50. All the octaves are in tune! I
> borrowed an o'scope and have to get to it on the other calibrations because:
>
> 1 voice is louder than others upon pressing a key -maybe short attack for
> that card?
> 1 voice trails off longer than the others -maybe long release for that
> card?
> there is a C#-ish ping upon start up that goes away
> there is occasionally a hum in the background like when a string
> divide-down keyboard has a bad capacitor for a single note
> very few of the presets sound anything like I remember them sounding when
> I had my last CS50. Some make no sound at all.
>
> Question: should I replace all the green small value capacitors? If so
> does anyone have a brand or type they recommend? I was going to get some
> from my local electronics shop but they looked nothing like the ones they
> would replace.
>
> Anyone have recommendations of what to look for for the above problems?
>
> Onward!
>
> Matt in Oakland
>
>
>
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