My CS-80 restoration project about 1/3 completed and the instrument's health bar is finally in the yellow and green. Most of the systems are working (in addition to some failed sub-systems. A fussy voice card of the 16 is out of tune at times and makes it known, it can be replaced. Enough is working to present to you what a properly functioning CS-80 should sound like.
Definitely resides in the category "most complex production electronic musical instrument". Over 200 lbs of printed circuit board and wiring. Less than 800 CS-80s were made due to high cost and complexity. Serial numbers started at 1000 and ended before 1800. This CS-80 is serial number 1306, the 306th unit off the assembly line.
Signal path is the CS-80 --- Lexicon 224XL digital reverberator --- direct line audio feed into Sony HDR-XR520V HD camera.
Audio AGC circuit (has to be in the camera?) compresses the sound level dynamics. Quiet keyboard is "middle level" and sudden loud sound is distorted. Could be the optical servo gain stages on the CS-80 preamp board that are having problems. Whoooo.... 30+ year old optical isolation gain stage systems. :D 30 year old LEDs... wow.
UPDATE:
This keyboard just makes too much rich sound to be understood at this time, but a hoot to play even when still broken. Back into the secret lab....... touch sensor restoration and preamp repair.
Will have new videos as soon as possible.
Thanks for watching and listening!
Негізгі бет Yamaha CS-80 and Lexicon 224XL Sound Sampler
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