[sdiy] Yamaha CS-15D schematic

[Richard Atkinson]

On Feb 18 2008, Loscha wrote:

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

Unless I'm very much mistaken, the fdiskc site doesn't have the service 
manual for the CS-15D. It has the CS-15 and the CS-20M/-40M but not the 
dual channel preset / variable CS-15D.

I have been examining the CS-15D at the weekend and the findings have been 
quite interesting. Channel 1 is the preset channel, which may use one of 15 
preset sounds. Some of those sounds seem to use synthesizer features which 
are not available from the variable controls on Channel 2, so that it is 
impossible to create these sounds on Channel 2. For example, 'Oboe' on 
Channel 1 seems to use a band pass filter setting which is not available 
from the variable controls.

Once I'd been through all the preset sounds to find out what footage each 
sound uses, it became much easier to get interesting sounds out of the 
machine. Footages available are 32', 16', 8', 4' and 2'. By combining two 
sounds with adjacent or identical footages, some quite pleasing sounds 
emerge.

Richard


>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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