Unplug the microwave from the wall outlet, often located in the cabinet above the microwave.
Remove the screws from the grill at the top of the microwave. Remove the grill. If the microwave is a counter-top model, there is no grill. Remove the outer cover by removing the screws securing it in place.
Remove the screw at the top of the control panel.
Lift the control panel up and slightly away from the microwave. Look at the bottom of the control panel for a locking tab that secures the panel to the microwave. If necessary, lift the panel up and then rotate clockwise to free this tab of the control housing.
Transfer the wires from the old control panel to then new control panel, one at a time.
Align the new control panel with the control housing. Slide it down into position.
Secure the new control panel using the screw that was removed.
Replace the grill at the top of the microwave, or the outer cover, then secure using the screws that were removed.
Plug the microwave back into the wall outlet.