When the microwave oven is in use, the circuit power is relatively large, generally more than one kilowatt, and the requirements for the high-voltage diode of the microwave oven are also relatively high. The character symbol of diode is D, which is divided into positive electrode and negative electrode.
Electromechanical controlled microwave ovens only have high-voltage diodes with the same symbol. At present, all microwave ovens at home need a high-voltage diode to provide an anode for the microwave oven, just like the high-voltage silicon stack on the commonly used black-and-white TV set.
Once the high voltage diode of the same type microwave oven is damaged, it must be replaced with a new one. When replacing the high-voltage diode of microwave oven, we must pay attention to whether the model and size of the high-voltage diode of microwave oven are appropriate.
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There are many reasons why the high voltage diode of microwave oven is damaged in use. When in use, that high-voltage diode and the capacitor of the microwave oven together form a rectification circuit of the microwave oven. It can be said that the damage of high voltage diode of microwave oven is the most important reason why microwave oven can't work normally.
The reason why the high voltage diode of microwave oven is damaged is that the voltage of microwave oven is unstable during use, and it is burnt out due to overvoltage when working at peak voltage. Measure the quality of diode, disconnect the circuit with the resistance of multimeter, and measure it separately. Because the red rod of the multimeter passes through the negative electrode of the battery.
Therefore, the red bar is connected to the negative electrode of the diode, and the Hei Bang is connected to the positive electrode of the diode (the pointer turns to low ohm). Ordinary diode, the forward conduction is 4-5 K ohms, and the reverse resistance is more than several M ohms. The bigger the diode, the better.