u/MetraByte03

Is anyone perhaps able to test how an EPS Classic reacts to moving the Data Entry slider slowly up and down in the layer or wavesample field within Edit mode? (Preferably on an instrument with a lot of wavesamples/layers). Does it move through the wavesamples one by one in the direction you move the slider? Or does it erratically cycle through many wavesamples in a short burst? A video would be helpful if you can. Thank you!

Does anyone happen to have the KPC board schematic for the EPS Classic? I have the Display and Main board schematics, but wherever I look, the KPC seems to be missing. Any help would be very appreciated :)

Hey everyone! I've recently been attempting to get my Dad's old EPS classic to work. This is a bit long but basically the current technical info is that power supply keeps dying. Voltages on the main harness are currently: Pins 13&14: 0v, 13&15: 1.2v, 13&16: 0v and 17&18: 0v. Display voltages are all 0, except for the ~5vac filament. Floppy drive doesn't get it's 5v rail, only 12v. All transformer voltages are in range. No fuses are being blown.

Here's some background:

When this issue first began, the EPS would only sometimes successfully power on. Then that stopped being the case and Fuse 2 would immediately blow upon powering on (even with the power supply unloaded), so I had it recapped. That didn't resolve the issue so I sent it to Ensoniq Vintage Place on eBay to have the whole supply checked and repaired professionally. Once it was fixed, he said he had a test sequence running for about 4 hours successfully, but when I got it back, the exact same issue was happening again. I replaced the switch and line filter in the EPS with no results, so I sent the PSU back again. He ended up swapping my PSU for another one that he said was working. When I got that back, Fuse 2 still blew unloaded so I replaced the transformer which seemed to resolve the issue. This was odd because both transformers had voltages in range with the spec and didn't appear to have any issues. But I was just happy the EPS appeared to be finally working.

Jump a little less than a year of very little use, the EPS was no longer turning on again after a couple nights of playing it and creating a short sequence. This time, I was getting no voltages other than to the Display (which would flash when turning the unit off), so I sent it back to the same guy again. When I got it back, and hooked it up to the EPS, it still wouldn't power on. When testing the voltages now, see the first paragraph. Any help would be greatly appreciated! I'd love to have this working again for my Dad. Thank you! :)

https://preview.redd.it/r6hiym0ei48h1.jpg?width=4032&format=pjpg&auto=webp&s=77368f8ea547c86546b6d3b8cbfc60a305254b26

https://preview.redd.it/0egnxm0ei48h1.jpg?width=4032&format=pjpg&auto=webp&s=5f73ca04911cbdfa85f9d8b718a81cb2bf2be7df

https://preview.redd.it/8slh2n0ei48h1.jpg?width=4032&format=pjpg&auto=webp&s=f7c4cfec4dcf02c9a7d564155519706e9a0606e7

https://preview.redd.it/2m2zum0ei48h1.jpg?width=4032&format=pjpg&auto=webp&s=8b4054a1c57c4ef258f1d88a93b7220ba971f297