While you wait for answers, we may have found some information which could help you.
Click here for Blender Coupling KitchenaidBlender lights flashing and smoking?
kitchenaid mixer model k5m90wh?
My Kitchenaid blender spindle has broken?
My kitchenaid professional series stand mixer won't turn on?
Kitchen Aid - speed lever?
How to disassamble kitchenaid KSM90 mixer?