First, you should turn off the power of the microwave oven. This is very important, because when you are doing maintenance work, you should not let current pass through the wires of the microwave oven. Otherwise, you may get a serious electric shock.
Secondly, remove the shell of the microwave oven, which often requires removing the screws of the microwave oven. Please note that you need to use the right tools to disassemble the microwave oven, otherwise you may damage the microwave oven or your own hands. Once the outer layer of the microwave oven is removed, you can check the internal parts of the microwave oven, especially the door, microwave oven wheels and so on. Find parts that may have problems, such as parts with short circuits. If problems are found in the inspection, you can try to repair or replace the damaged parts. If you are not sure which part is wrong, you can consult professional and technical personnel.
The high-voltage capacitor inside the microwave oven is a very dangerous component because it stores high-voltage charges. If you don't know how to uninstall safely, you'd better not try. At this time, it is best to ask professional and technical personnel to deal with related problems for you.
Finally, when you fix the microwave oven, you can reassemble it. If you are not sure how to reassemble the microwave oven, you can check the user manual of the microwave oven or consult a professional technician.
To sum up, the maintenance of microwave ovens requires certain skills and experience, and special care is needed to avoid any dangerous situation. If you are not sure whether you can safely repair the microwave oven, or need a higher level of maintenance, it is recommended to ask professional technicians to help solve it. At the same time, reasonable use of microwave oven and regular cleaning and maintenance will help to prolong the service life of microwave oven.