In December 2014 my Sharp R820BK microwave/convection oven just stopped working. I woke up one morning and went to heat something in the microwave and the was no time being displayed. Nothing worked on the keypad. It worked fine the day before. The AC outlet tested fine.
I put off removing it and looking at it until earlier this month. I removed the microwave and opened the case. The
Littelfuse Series 314 20A 250V fast acting ceramic cartridge fuse had blown. I bought a 5-pack of the exact same fuse on eBay for $6.53 USD, including shipping. I replaced the fuse and life returned to the microwave.
If one's microwave quits - without an
apparent catastrophic failure - check the internal fuse. Replacing the fuse may be all that is needed.