Hello, I was modding a Manley Techno Beat keyboard and I added a quarter inch jack no problem. Then I experiented by adding a dc jack and when I turned it on I heard a solid tone for about 3 seconds and smelled burning so I disconnected the jack and reassembled the old battery pack...but the keyboard isn't working anymore. Did I fry the unit? Or possibly a capacitor? Can this be fixed? I hope so. I was really looking forward to pitch bending this.