[sdiy] Yamaha CS-15D schematic

[Loscha]

Anthony;

 You can check out a bit of info on
http://www.loscha.com/miller/Yamaha_IC_Data_Book.pdf (9meg)
This has info about all those various chips, and lots of other stuff
from a similar period.

Service manual for said unit, and my data book again is here
http://manuals.fdiskc.com/tree/Yamaha/

-ErJ

On Mon, Feb 18, 2008 at 6:00 PM, Bob Weigel <sounddoctorin at imt.net> wrote:
> The CS15D has the odd chips mentioned in the template page from
>  sounddoctorin.com/synthtec as I try to do with all of them.  If anyone
>  has info to add let me know. The CS series all use the same chips to a
>  great extent, though some with Ring mods obviously use some additional
>  chips etc.  But the IG00156 vcf chip and IG00151 VCA and IG00153 VCO and
>  a few waveshaper options I think are common to all of them.
>
>  And to answer Richard also, yes I definitely have the 15D digram and the
>  15.  The preset arrays are in there.  This is a synth with two synth
>  channels with of the VCO chips, 2 EG's IG00159, one VCF chip and I think
>  6 VCA chips per.  Whatever sounds it makes is the result of arranging
>  these facilities with programming 'packs' of resistors and diodes it
>  appears. Believe it or not :-).  It is a very innovative machine.  Gotta
>  love it.   The machine uses 4558 op amps for the waveshape converter,
>  not the ..IG00158 i think it is that the CS80 etc. uses. -Bob
>
>
>
>  anthony wrote:
>
>  > The important question for me is: is it worth having the schematic if
>  > you don't have the actual synth? I mean are there good bits to try to
>  > mess about with or is it disappointingly full of CEM parts like the
>  > Roland SH-101?
>  >
>  >
>  >> That machine is truly one of my great all time ebay deals.  Folks
>  >> picked it up in cali for me for 200 with an a perfect anvil flight
>  >> case in perfect condition save the keys seem to need a little lube.
>  >> They just seem a little sluggish compared to my CS20M with the same
>  >> movement. Anyway I have the diagram from Yamaha's site but as a
>  >> service guy of course I'm not supposed to share them.  As you see on
>  >> my website the CS-15 and a lot of others are on the fdisk site.  I'm
>  >> not sure how they/if they got permission or if Yamaha resents this at
>  >> all.  Anybody up on Yamaha's attitude on this stuff? -Bob
>  >>
>  >> Richard Atkinson wrote:
>  >>
>  >>> Has anyone seen the schematic diagram for this rather unusual preset /
>  >>> variable monosynth? In one sense it's a more capable synthesizer
>  >>> than any
>  >>> of the CS-5, 10, 15 bunch, even the CS-30, since it has two VCOs,
>  >>> two VCFs,
>  >>> 2 VCAs and 4 envelope generators. However, half of that is stuck behind
>  >>> preset sounds only, and the modulation capabilities are inferior to
>  >>> all the
>  >>> previous synthesizers.
>  >>>
>  >>> A prime candidate for modification and modularising, you might say!
>  >>>
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>  >>>
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