Vintage Synth Repair

--- In vintagesynthrepair@y..., mtcasino@c... wrote:
> Bad cap or solder joint some where in that circut .

Thanks for the insight. All the joints looked good to me, but I de-
and re-soldered some of them all the same. Checked the caps, checked
the diodes - all fine.

I swapped IC5 and IC9 around. They are both CMOS 4081 quad 2-input AND
gates. One way round I get the fault previously described, the other
way round I get note recognition no problem, but the notes never turn
off. So, I'd say that points to one of the 4081s.

I've ordered a couple but it will be next week sometime when they
arrive. Thinking about it, I never was convinced about "leap"
arpeggiate with 3 keys held down, so I've ordered replacements for
some of the other ICs too.

I'll keep you all updated. 

Cheers,
Matt.