Hi Sebastian!
Welcome to the group. I'm not sure what's wrong with your CS-50, but I
don't think you have a chance of tracing it without an oscilloscope.
Lot's of the key data is time-multiplexed, so a meter won't be good
enough to see what is going on. I picked up an old 10 MHz 'scope for
about $50, which was good enough for anything in the Yamaha.
As far as finding spare KAS & DAC chips: good luck! As I posted,
someone has been selling off parts of a CS80 on eBay, but so far hasn't
put up any of the boards with the custom Yamaha chips. Actually,
CS-50s are good sources of spare parts for CS80s, but that won't help you...
I'd actually bet it's not the Yamaha chips, and it's probably some of
the CMOS chips. Anyway, if you pick up a 'scope, the service manual has
enough detail of the waveforms to see what they should be.
If you would be happy with the Kenton and the Paia, go ahead, but I
would be hesitant to put so much money into the MIDI kits, which, at
least in the US, cost more than the CS-50.
Keep us up to date on your repairs & upgrades!
David
sebastian_cordoves wrote:
> Hi all:
> I'm Sebastian Cordoves from Argentina, my native language is spanish,
> please forgive my poor english.
> I'm a recording technician, and teach music production for living.
> My wife sings, togheter we have a electro-pop band.
> I own some analogue synths, and know a bit about electronics, so I do
> my own repairing (everytime I could).
> I bought a Yamaha CS-50 about 6 years ago, it worked well for about a
> year, but then it broke up. I bought a Kenton MIDI retrofit, but never
> installed it because it came a few days before the synth stopped
> working.
> For various reasons I put the synth aside and only about a year ago
> started trying to repair it.
> The problem is the KAS, and I am almost sure that is one of the Yamaha
> custom chips (YM26600 or YM26700). I don't have an oscilloscope, so
> I do some metering with a multimeter and some of the pins are outputting
> what I think is right data but others are dead. I have the schematics
> of the CS-50 (Courtesy of Kenton), I'm in the process of scanning them,
> I can post them later.
> At the moment I'm driving one voice of the synth with the CV/Gate out
> of my Novation BassStation Rack. I'm planning to buy a PAiA MIDI to CV
> interface to drive the 4 voices, and install the Kenton retrofit to
> control cutoff and other parameters.
> But it will be great if I found the Yamaha IC's and remplace them.
> Does anybody know where can I find those chips or even an entire KAS?
> I've looked in e-bay and over the internet with no luck.
> Thanks in advance for your help.
>
>
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