Yamaha SK-50D -1980

    Weight = ? Lbs. Number mfg.= ? MRP=$3875

User Manual: Yamaha
Reset Proceedures: N/A
Operating System code:
MIDI or other control protocol:
Software related Links: N/A
Patches or knob settings:
Circuit Overview: below
Scematics/Service Manual:
Common Service Issues/Tips: below
Parts Sources: Keys knobs semiconductors misc
Uncommon chips/modules used: YM62100 key assigner, YM62400 single channel assigner, YM62200 Tone generator, YM70600 bass generator, YM 70200 + YM70300 organ generator (pair for upper and lower), YM70400 polysynth generator, YM62700 PSC, IG03280 sust. time code converter, IG00153 VCO, IG02601 and IG00151 VCA, IG00159 EG, IG00156 VCF, IG00150 LFO, YM626 delay vibrato generator, IG00157 switch memory (appears an electronic equiv. to the old push button where you select one and it knocks the previously selected one out)
General Info Links: Vintage Synth Explorer

Circuit Overview:
     SK series synths I believe are divide down oscillators with some analog circuitry and some digital stuff going on. Anyone have a better description? Hope to get one of these soon.

Service Tips:

While Yamaha normally does not keep parts around more than 5 years or so, I have scrap sk20
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