I’ve been looking for someone who can assist with a repair on my Roland EP-10. The power and outputs are working perfectly and most of the keys are working bar 8, with no discernible pattern around the malfunctioning ones. Some are fully dead and others just pop when activated. The rest work perfectly fine and I can’t see any physical issues with the key contacts or pcbs internally when I cracked it open. I picked it up for 20 quid knowing full well it would be somewhat faulty. I’m quite the novice when it comes to circuit boards and instrument repairs but I’m keen to learn about it and how to diagnose and repair this sort of equipment as I find it all quite interesting. Any sort of assistance that can send me in the right direction would be very much appreciated. Thanks!
It’s worth getting hold of the service manual if you can find it.
This will help with understanding how the keyboard is wired and checking components/traces.
Keys are usually scanned in groups, so the 8 dead ones may be because a trace or component for that group is faulty. If you’re still struggling, Syntaur may have a spare part for the keyboard contact board.
Good luck and keep us posted on progress.
I’ve searched far and wide for the service manual but with no luck as of yet. What would be the process of mapping out the circuitry from scratch?
So C1, G#2, F3, F#3, D4, F5, F#5 and D5 are the faulty keys?
Do they have wiring in common?
Are the contacts clean BTW?
Have you taken out the boards and checked both sides?
the contacts look visually clean, I haven’t seen a key contact like it before and all of them look virtually spotless. It doesn’t look like they have common wiring, there is one board I’m yet to check behind, but will do today.
I don’t quite understand, which keys are malfunctioning ?