I do have the CS15D service manual listed in my Ebay store,it has full schematics, adjustment procedures,coding guide specifications,waveforms etc.it has 65 pages with two 40" X 28" large foldout schematics.
it is ebay item number 360105300519
direct link to my Ebay store.
http://www.sonicelectronicmusic.com
http://www.sonicelectronicmusic.com
To: vintagesynthrepair@yahoogroups.com
From: brian@...
Date: Fri, 7 Nov 2008 13:13:02 +0000
Subject: RE: [vintagesynthrepair] CS-15D schematics?
Hi Arto
I have access to the entire range of schematics in the Yamaha range both old and new. ; The CS15D is not listed! There are only a half dozen listing for any CS model and the nearest to the CS15D is the CS1D. On this occasion I can’t help.
From: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of Arto Koivisto
Sent: Thursday, 06 November 2008 12:39
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] CS-15D schematics?
Hi!
Would anyone have the schematics and/or a service manual for Yamaha
CS-15D online? I tried contacting Yamaha about these, but haven't
received any mail besides some automated "..will contact you shortly"
crap. I tried also briefly comparing CS-15 schematics against the boards
but have not yet found any resemblance besides the custom Yamaha chips
used here and there.
I've had one of these waiting for repairs for quite some time and would
now like to proceed with it by checking the filter calibration /
functionality for the 2nd osc. With certain low cutoff value, and when
operated in manual mode, the output just abrubtly cuts out. Here, the
VCF EG also needs to be about halfway through in order to get any
output, if zero'ed the plain cutoff control doesn't enable output at any
setting. There is also a loud thump in the beginning of each note as if
there was a very short env mod applied to a separate low pass filter.
This thump doesn't relate to the VCA EG since the thump can be faded
away by using a longer attack time. When operated with presets, most of
them produce no output at all. There is f.ex. a "VCF Click" trimmer on
the VCF board but I'd rather have the whole synth calibrated according
to factory specs instead of just tweaking the trimmers at random.
Osc 1 seems to work with any preset selected, but the output level
varies from preset to preset and is in overall rather low when compared
against osc 2.
So, any help is appreciated. At a glance it sure looks like a damaged
custom chip, but naturally I'm hoping to get away with just
re-calibration and maybe swapping some common parts ;)
Thanks in advance,
..Arto.
Would anyone have the schematics and/or a service manual for Yamaha
CS-15D online? I tried contacting Yamaha about these, but haven't
received any mail besides some automated "..will contact you shortly"
crap. I tried also briefly comparing CS-15 schematics against the boards
but have not yet found any resemblance besides the custom Yamaha chips
used here and there.
I've had one of these waiting for repairs for quite some time and would
now like to proceed with it by checking the filter calibration /
functionality for the 2nd osc. With certain low cutoff value, and when
operated in manual mode, the output just abrubtly cuts out. Here, the
VCF EG also needs to be about halfway through in order to get any
output, if zero'ed the plain cutoff control doesn't enable output at any
setting. There is also a loud thump in the beginning of each note as if
there was a very short env mod applied to a separate low pass filter.
This thump doesn't relate to the VCA EG since the thump can be faded
away by using a longer attack time. When operated with presets, most of
them produce no output at all. There is f.ex. a "VCF Click" trimmer on
the VCF board but I'd rather have the whole synth calibrated according
to factory specs instead of just tweaking the trimmers at random.
Osc 1 seems to work with any preset selected, but the output level
varies from preset to preset and is in overall rather low when compared
against osc 2.
So, any help is appreciated. At a glance it sure looks like a damaged
custom chip, but naturally I'm hoping to get away with just
re-calibration and maybe swapping some common parts ;)
Thanks in advance,
..Arto.
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