Vintage Synth Repair

Thanks Frank, but you have the same version I already have; schematics only, shuffled pages.

However, little follow up: I swapped the SSM2044 (VCF) between voices 0 and 1 and Bingo ! It worked fine on all voices... only for a while :( After say 1 hour of playing, 7 voices suddenly had stopped working. I switched it off-then-on, and all voices were back to normal. I noticed I was able to mute some voices while playing with the memory switches -- still have no battery, hence memory may contains only junk. 
This confirm my thought; CPU send bad signals to the synth board and drives the VCF/VCA/EG in an oddly way.

--- In vintagesynthrepair@yahoogroups.com, "alesisfusion8hd" <babouche369@...> wrote:
>
> Does anyone have the full service manual for Korg Trident Mk2? The one we find on the web has missing pages: no tuning procedure, no explanation of the misc test points.
> 
> My Mk2 has a dead voice (voice 0). I removed the dead internal battery which has corroded the nearby CPU pins and leaked its nasty guts on the board below. However, all tracks are okay, and once cleaned up the CPU works fine. I'll replace the Varta by a standard CR2032 as I found a socket for CR2032 with the exact same pin spacing as the original battery.
> 
> I succeeded to make the dead voice to sing again while I was doing some intense bug tracking. I was messing up with the control pannel, and especially with the keyboard mode (mode II triggers voices starting from 0 while mode I does a round-robin) and switching back and forth from program to manual. At a time, I had all 8 voices working prefectly. Unfortunatelly, I was not able to reproduce the sequence and make it working again, but this tells me all SSM and the audio path are okay. I suspect the bug resides somewhere in the control voltage.
>