Disconnect the electrical power supply wiring.
Loosen the screws on the power supply wire clamp so that the power supply wires can slide out of the clamp when the range hood is pulled out of the cabinet.
Remove the middle mounting screw.
Loosen the mounting screws on the 4 corners by 1/8-inch.
Pull the range hood forward about ¼-inch to release the corner screw through the keyhole slots.
Carefully pull the range hood down and set it upside down on a padded work surface.
Warning: The range hood is heavy. Two persons may be needed to safely pull the range hood down and set it on a padded work surface.