EPS 16 plus output distortion

Hey y’all,
I’ve been fixing a busted 16 plus (trying to, at least) and am at the point where everything is working. Sounds load, samples great, keyboard is doing just fine, but after its been on for a couple minutes all the outputs start heavily distorting to the point that the volume slider had no effect on the output from zero to 100.

I’ve been hunting in the d/a section for any wonky caps for grounding issues but haven’t found anything yet. Anybody dealt with this issue in particular? Got any hints as to where i should be looking?

you can skip to the last 20 seconds of the video for when the problem kicks in.

Thanks in advance! https://youtu.be/nlSTW0WLdJw

Have you checked the power supply caps and output voltages to the d/a section. The P/S in these units are very often the culprit because of their age. It is often a very prudent maintenance procedure to replace all the caps on the P/S. If you need further repair you can reach out to Thesoniq.com. He is the go to guy for Ensoniq repair.

Thanks for responding! The first thing I did when starting the repairs was to recap the power board. I’ll check the voltages regardless