So I was messing around with my Roland SK-88 Pro this afternoon and noticed that a few of the buttons weren't as responsive as I might have liked them to be. This is really quite a common problem for electronics of this vintage, as the tact switches will oxidize over time causing their contact resistance to rise from a few scant milliohms to dozens or even hundreds of ohms.
Thankfully the fix is pretty simple: just unsolder the old ones and solder in some new ones. I'd picked up a pretty decent sized stash of compatible tact switches after replacing the ones on my MC-303, so there was nothing stopping me but time and motivation, and I found an ample supply of both this evening.
The original tact switches were a slightly different variety this time, having a round case instead of a square one, but the lead spacing (5mm) and height (5mm) was still the same and there was plenty of room on the PCB to fit the square ones.
The process went very smoothly and I'm happy to report that the new switches work flawlessly.
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