When a new microwave oven is powered on and starts operating, there may be a slight odor, which is a normal phenomenon; the high-voltage transformer in the microwave oven uses enameled wire, and a slight odor may occur when the temperature rises after being powered on; the heating tube may emit a small amount of smoke during its first operation in the grilling mode, which is because there is a layer of protective oil on the heating tube during the production process of the machine, and it will volatilize after heating and use, posing no harm to the human body. The odor can disappear by using the grilling function to heat for a while during the first use.