Vintage Synth Repair

Hi,

I've recently put up a detailed repair log of the Ace Tone PS-1000 mono synth, which I bought a few months ago in non-working condition, and restored to 98% functionality, without schematics or any other documentation.

Here's what I had to fix along the way: Restore power (the synth was completely dead on arrival), fix the dead VCO (the oscillator didn't output anything), repair the noise source (dead also), restore the VCF (75% dead on arrival), fix the portamento (completely messed up) and finally tune the keyboard & octave stretches.

I realize that this isn't a well-known synth, so the information contained in the page might not be directly applicable to any repair project you might have, but if you've ever had trouble repairing any of the above problems, perhaps my detailed repair log may help you in troubleshooting them.

There are also a few small issues left with the synth, and perhaps some of you could help me figure out how to fix them...

You can check out the page here:

http://www.estecho.com/gear/Acetone_PS1000.php

The site also has lots of information (specs, repair info, mods) on analog tape echoes and drum machines.

Thanks!
J.F. at ESTECHO.com