Merquisede R Jersey City , NJ January 21, 2017 Appliance: KitchenAid Portables - Stand Mixer KSM90 Kitchenaid Mixer Ksm90: Speed gobernar and speed control platea. How to replace Stand Mixer Speed Control Plate. First check if current was reaching speed control plate. Found out it wasn’t. Control Contact plates were burn out. Test it by having control plates make contact and machine Starter to work again. Seek out part and watch applianceparts video DYS and since governor control was there accesible. Did replacement it too since machine have been used quiet sometime. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes