Mr Clean
AKA Teddy Wong
To be honest mate, without a good look at it close up, I wouldn't really know what to suggest. (Keyboards aren't really a great area of my knowledge)
From what I've read, the big springs are the return springs so they should be fine. The smaller springs at the under-front of the keys look like they stretch and make a circuit with the parallel rod or make a connection to the diode at the back. So I would assume something in that area is the deal breaker. A few of the springs in this picture below are not looking the best. That would be what I would pay most attention to. (Possibly switch it on and play a few notes with the keyboard upside down to see what's happening with those keys)
What I would make sure of before doing anything is, knowing exactly what keys are faulty, or at least the range of keys (mark them underneath if necessary) and can those small springs be removed and changed around easily. Say, take 12 (or however many are needed) from the end of the keyboard and replace in the middle where the faulty part is.
I've tried finding more info about the keyboard but there is very little out there. I found the Owners Manual and Service Manual but couldn't see anything of help in there.
You can get the manuals here - Ensoniq ESQ1 Hacker Page (They're safe, I've downloaded them)
From what I've read, the big springs are the return springs so they should be fine. The smaller springs at the under-front of the keys look like they stretch and make a circuit with the parallel rod or make a connection to the diode at the back. So I would assume something in that area is the deal breaker. A few of the springs in this picture below are not looking the best. That would be what I would pay most attention to. (Possibly switch it on and play a few notes with the keyboard upside down to see what's happening with those keys)
What I would make sure of before doing anything is, knowing exactly what keys are faulty, or at least the range of keys (mark them underneath if necessary) and can those small springs be removed and changed around easily. Say, take 12 (or however many are needed) from the end of the keyboard and replace in the middle where the faulty part is.
I've tried finding more info about the keyboard but there is very little out there. I found the Owners Manual and Service Manual but couldn't see anything of help in there.
You can get the manuals here - Ensoniq ESQ1 Hacker Page (They're safe, I've downloaded them)