With the advancement of time, all kinds of electrical appliances are on the market, and there are many high-tech electronic products and appliances in people's lives. Among the appliances, the most common are digital appliances and kitchen appliances. Oven is one kind of kitchen appliance, which is a kind of appliance specialized in baking and grilling. Ovens and microwaves are appliances that many people have in their homes, but many people do not know how ovens work. The working principle of the oven and microwave oven is different, now, let's look at the working principle of the oven. First, the working principle of the oven electric oven is the use of electric heating elements issued by the radiant heat to bake food electric appliances, the use of which we can make baked chicken, roast duck, baked bread, pastries and so on. According to the different needs of the baked food, the temperature of the electric oven can generally be adjusted within the range of 50-250 ℃. Electric oven is mainly composed of box, electric heating element, thermostat, timer and power adjustment switch. Its box mainly consists of shell, compartment, liner composed of three-layer structure, in the liner before and after the formation of rolled edges on the side to isolate the cavity air; in the outer cavity filled with insulated expanded perlite products, so that the shell temperature is greatly reduced; at the same time in the door below the installation of the spring structure, so that the door is always pressed in the door frame, so that it has a better sealing properties. Second, how to repair the oven typical oven repair includes the main switch, thermal fuse body, heating elements, and electromagnetic service. Repairing the Main Switch: The oven's main switch is an important part of the operating system that gets widely used and is a common culprit when things go wrong. In many cases, all that is required is to clean the switch. In others, the switch must be replaced. To access and replace the main switch: Step 1: Remove the side panel and, if necessary, the power cord. Step 2: Check for pitting or discolored contacts. If they do not make good contact, very fine sandpaper carefully rubbed, then with a clean electrical contact swab end sprayed with cleaner or isopropyl alcohol. Be careful not to bend the alignment contact leaves. Step 3: If the contacts are fused or the leaves are broken, remove and replace the main switch. The main switch is secured to the chassis with clips, screws or rivets. Repair Thermal Fuse: A thermal fuse protects the main switch from damage caused by overloading the motor of the oven. If the main switch does not work, check the thermal fuse using a continuity tester or multimeter. The thermal fuse should show continuity, not an open circuit. If defective, remove and replace the thermal fuse with one of the same rating. In most models, this means cutting the fuse wire or wires and replacing the fuse unit. Above, this is how the oven works. The operation of the oven is relatively simple, there are usually only three rotary buttons to adjust the time temperature and functions. When we use the oven, we can go for baking time and temperature according to different ingredients. Different ingredients need different time and temperature, so we have to adjust manually. When using the oven to bake bread, be careful not to adjust the temperature too high, so that the bread will be baked, the taste is not good, we should learn to control the temperature.