https://www.youtube.com/watch?v=uxFYOz0DE-0
The buttons were annoying me! So I researched and discovered that you don't need to replace them with troublesome de-soldering work. You simply clean them with isoprophyl alcohol. This video covers how, in hopefully and easy to understand way.
Credits to this method go to the Yahoo group "polyex".
A simple way to repair microswitches on Korg EX-800
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