Classic 2 VCO analog subtracive synth with a 40 step sequencer and arpeggiator.
Aside from obviously tracing signals around curtis chips and standard aged power supply cap issues etc. I haven't heard of any other real weakness.
A lot of discrete parts in these so let me know if you need anything. A company has created a replacement for the cpu at BMH . ALSO if you have key contact issues watch THIS VIDEO on contact restoration for the LATER models with the strange plastic based contact strips. NOTE I haven't tried this myself and Nick only did it on this unit... Kevin Lightner recommends:
"I'd take this strip and soak it in Tarn-X followed by heavy rinsing afterward. If it's silver oxide causing the probs, I've found no better treatment. (mind you, tarn-x accelerates oxidizing if not completely rinsed away.)
A lot of discrete parts in these so let me know if you need anything.
Contact Sound Doctorin'