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Listen for unusual noises or a change in the noise coming from your microwave:
Listening for noises
It is normal for a microwave to produce noise during its regular operation. A change in the type of noise produced is most likely indicative of some type of maintenance that needs to be performed.
The appearance of a grinding, squealing, or scraping sound could mean you need a belt replaced or that a motor is in need of lubrication. Performing minor maintenance tasks now, such as lubricating a motor and replacing a belt, can prevent having to conduct even more costly repairs in the future.
CAUTION: Your microwave oven is capable of giving you a serious electrical shock, even when it is unplugged. We strongly suggest you seek the assistance of an appliance repair technician when conducting any microwave oven repair.