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built1950, Handyman
Category: Appliance
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Experience:  Appliance Installer
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Panasonic T7748F Microwave shuts down after 30 to 38 seconds

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Panasonic T7748F Microwave shuts down after 30 to 38 seconds with no noticeable warm up.
Thank you for asking your question on JustAnswer. During that 30 seconds can you hear the fan running?
If not then the magnetron is not being cooled and the fan needs replacing.
If yes then the magnetron needs replacing.
Either way you must be vary careful servicing microwaves because they have a high voltage capacitor that can kill you. It must be discharged safely before repairing.
built1950 and 6 other Appliance Specialists are ready to help you