User Manual: Yamaha
Reset Proceedures: N/A
Operating System code: N/A
MIDI or other control protocol: N/A
Software related Links: N/A
Patches or knob settings:
Circuit Overview: below
Scematics/Service Manual: fdiskc archive or Manual Manor
Common Service Issues/Tips: below
Parts Sources: Keys knobs semiconductors misc
Uncommon chips/modules used:M51620P/IG00150 lfo chip, M51621L/IG00151 VCA's, IG00153 VCO, IG00156 VCF, IG00158 WSC, IG00159 EG/VCA, uA796HC gain cell, BA634 divider, BA617 OTA, YM615 key assigner, YM616 cpu, YM617 mux/demux, lots of TC series chips.
Modifications:Eric's CS-15dx modwhich probably can be done in any dual vco CS synth though the 40M may require a lot of modifications
General Info Links: Vintage Synth Explorer
Circuit Overview:
A subtractive analog synth similar in many ways to other CS series, but this one has a duophonic capability. Not sure which method they used. Similar to CS20M in memory design I'm sure.
Service Tips:
Typical problems in CS series are power supply over voltages which blow tantalum capacitors and they short, or the caps just fail over the years. During this various chips may be taken out. I've seen LFO chip, VCA's and dac comparator fail so they might be most susceptable.
Parts:
I believe I should have any electronic part or keys for these save exact transformer, etc. Ask if you have need.
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