[sdiy] Repairability of modern analog synths

[Gordonjcp]

On Tue, Oct 20, 2020 at 03:22:41PM -0700, David G Dixon wrote:
> Honestly, it's been so long since I had it out of the case that I really
> don't remember, but I seem to recall that it didn't do much of anything.
> Some panel lights came on, I think, and it might have made some sort of
> ungodly noise.  I came to the conclusion that it was pretty fried, but I
> didn't have the time or energy to deal with it at the time (I think I was at
> peak pancreas-self-destruction around then) and I have simply never gotten
> back to it.
> 
> It could be something as trivial as a dead battery.
> 

Check the power supply, and when you find the thermal fuse in the  centre tap for the analogue supplies has failed open, pick the tape off and link it out.

They do all sorts of strange stuff - they take about five minutes to calibrate, then the filters are stuck wide open.  you'll find that there's about (IIRC) 24V between the rails but they're at something mad like +7V and -17V about ground.

-- 
Gordonjcp