Shut off the circuit breaker that controls the cooktop and wait for the surface units to cool if the appliance has been in use.
Open the cabinet or range door and run your fingers along the upper edge below the cooktop to find the mounting screws.
Take out the screws securing the cooktop, using a screwdriver.
Pull up the front edge of the cooktop and raise to a 45 degree angle.
Pull forward on the cooktop to release it from the back edge of the range or countertop mounting bracket.
Unplug the power cord from the socket at the back of the range or inside the cabinet.