Vintage Synth Repair

So - here's the mess for today -

The power supply seems fine. I get an even 17 AC in and +/- 15 where 
desired. I've replaced some tantal coupling caps and when playing I 
now get a very, very faint signal. It keeps in tune and follows the 
settings on the control panel when it comes to glide and randomized 
notes. It does not react noticably to volume, ADSR, or any change in 
presets/sounds/VCF settings, but brightens a bit following the octave 
switch.

I find nothing that explains the blown fuse - and there is no bad 
smell. I've located no shorts or odd voltages. (Compared with a 
working unit.)

I'm at my witts end. Anyone got an idea what this could be? Or a 
service manual, of course. Or both.

As an extra challenge, this SH1000 is scheduled for live use - in 
concert - tomorrow night. I might just be screw'd..


-Mu