All of the kone mrl machines have resolvers. The issue of the car "jumping" on access is because of the brake slide and the result angle being lost. Once the tach, governor and resolver angle are in sync, all is well. Scott, I have only seen a bad resolver once at kone in ten years, and they replaced the whole machine. I do not believe they are replaceable. These systems use a governor encoder, and a tach on the machine sheave for comparison. The resolver is an "extra" necessity for the kone drive. The machine moving back and forth is a bad isolation pad underneath. Have fun changing that. It's a pain in the ass.