I had a Fender Rhodes 54 key electric piano in for repair last month. They use guitar type magnetic pickups wired together. If one pickup fails, every key goes silent. It is still easy to get spare parts for these so they can be brought back to top condition. The 73 or 88 key versions are more popular than this 1980 vintage 54 key instrument. I repaired or replaced 17 pickups on this one, re-adjusted the hammer action and individual note volume and re-tuned. Call me if you have one needs some attention.