Circuit Overview:
A subtractive analog synth, first of the CS series. Same voice cards as CS-80 and CS-60. Like CS-60 one VCO/voice but half of them (4). No pitch ribbon either.
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.
I had a most peculiar manifestation shown in a video I did on CS5. The cutoff control would just cease to impact a highly filtered sound at the Ab second from top and below or like that. It would change a note during warmup. Turned out the VCF chip was the issue!
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Slider caps and Knobs-
I have a decent selection of rotary knobs (Contact Sound Doctorin') and check Synthparts.com for slider caps.
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Semiconductor and Parts:
See Semiconductor page. I believe I should have any electronic part or keys for these save exact transformer, etc. Ask if you have need.
Contact Sound Doctorin'