[sdiy] Yamaha CS-60 issues

[Tom Wiltshire]

Yamaha have made a maintenance nightmare for their synths by their widespread use of proprietary chips.

I was recently helping someone in Spain who was developing a replacement for the YM617 for a CS-40m. The YM617 is pretty much a multiplexer-plus-some-bits. But getting the timing right to work in all the different ways Yamaha used it is not at all simple. In the end, we were able to get it working in most situations, and that allowed us to move the remaining working genuine chips to the critical locations where our slightly imperfect clone wouldn’t do the job.


> On 5 Oct 2020, at 19:53, al spitzley via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> I did replace those gates, and all the other CMOS on the KBC board. Having compared it to my friend's cs80 I guess this middle octave being unresponsive to the brillance keyboard control sliders is the way it is supposed to be.
> 
> The Kenton retrofit does not replace either the KAS or KBC. It works in conjunction with the Yamaha chips. If any of those die you still have a dead beast until you can source a ridiculously priced replacement chip!
> Cheers
> Al
> 
> Sent from Yahoo Mail on Android <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature>
> On Mon, Oct 5, 2020 at 8:55 AM, Florian Anwander
> <fanwander at mnet-online.de> wrote:
> Hello Al
> 
> Am 02.10.20 um 19:06 schrieb al spitzley via Synth-diy:
> > A retrofit would be amazing for me and many others.
> I don't know the Kenton MIDI retrofits. Do they replace the KBC too or 
> only the KAC?
> https://kentonuk.com/product/cs-60/ <https://kentonuk.com/product/cs-60/>
> 
> Florian
> 
> 
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