www.vintagesynth.com/roland/jx8p.php

Jim
I recently acquired a Roland JX-8P. Everything works great except I get stuck notes when I hit several keys, primarily the black ones. The notes just sustain and when I attempt to hit them again they don't don't sound obviously because they are sustaining. When I attach a keyboard controller, I can play without any issue at all. The JX-8P is perfect!! Thus no problems when using a controller keyboard. Key bed has been cleaned. Aftertouch works great! I just get get rid of the sustained notes. I've this is a big problem with the JX-8P and there doesn't appear to be a fix. Any ideas?

deathtokoalas
i picked mine up in early 98 and began to notice a similar problem by mid 2000. i was young and confident at the time, so i figured i could clean it myself. i ended up bending the metal contact. i still have the synth, but i've been using a dx100 to control it ever since.

it's actually rust on the contact - a known issue. in the late 90s, it was something that was easily fixed, if you weren't a cocky teenager. nowadays? well, the rust has probably been there quite a while.

a shop will realize it's a known issue and tell you if you can fix it, or if you need a controller.