No, a microwave oven should not discharge or produce microwaves when it is unplugged from the power source. When you unplug a microwave oven from the electrical outlet, it disconnects from the power supply, and the flow of electricity to the microwave's components, including the magnetron (the device that generates microwaves), is interrupted.
The microwave oven generates microwaves by converting electrical energy into microwave radiation using the magnetron. When the microwave is operating, it contains an internal capacitor that stores electrical energy to power the magnetron. This capacitor can hold a charge even after the microwave is unplugged. However, modern microwave ovens are designed with safety features that help dissipate any stored charge quickly after the power is disconnected.
While the capacitor may retain a small residual charge after unplugging the microwave, it is typically not enough to generate microwaves or pose any danger. Additionally, the high-voltage components are shielded and designed to prevent any accidental leakage of microwaves.
However, it's always a good idea to exercise caution and avoid tampering with the internal components of a microwave oven, especially if you are not familiar with its workings. If you suspect any issues with your microwave oven, it's best to have it inspected and repaired by a qualified professional.