The no-load voltage of a microwave oven transformer (MOT) can vary depending on the specific model and manufacturer. However, in most microwave ovens, the no-load voltage of the high-voltage transformer typically falls within the range of 2,000 to 2,400 volts AC (alternating current).
The purpose of the high-voltage transformer in a microwave oven is to step up the voltage from the standard household voltage (e.g., 120 or 230 volts AC) to the high voltage needed to power the magnetron, which generates the microwaves for cooking. This high voltage is required to excite the electrons inside the magnetron and produce the microwaves used to cook food.
It's important to note that working with high-voltage components can be extremely dangerous, and it should only be done by trained professionals. Tampering with or attempting to modify microwave oven components can lead to electric shock, serious injury, or even death. If you suspect any issues with your microwave oven or its components, it's best to contact a qualified service technician to handle the repairs and maintenance.