Vintage Synth Repair

Replacing the power supply caps can't do any harm, try it, but if it 
still doesn't work, look for bad solder joints, shorted 1/4 jacks, poor 
connections, etc.

It's possibly PSU related though : The distorted sound could be the 
audio signal passing through an unpowered opamp, and no sound from the 
right channel could be caused by the L+R merging components for the mono 
output (when nothing is plugged in R) not receiving power.

But at the same time, it could be caused by damaged output jacks. There 
would be a bit of audio signal leaking from the shorted signal.

Scott Davies a \ufffdcrit :
> I picked up an Ensoniq ESQ1 the other day that has very low output in 
> the left/mono channel and no output from the right channel. The ESQ1 
> Hacker page suggests that replacing the capacitors in the power supply 
> could cure many problems. The internal battery warning comes on after 
> power up, although it still has enough juice to hold patches so far
> (after it was initialized).  Looking for any advice/suggestions on 
> troubleshooting this.  Thanks, Scott
>