D8 Hypersonic hair dryer Processing.When using a hair dryer, it suddenly becomes unresponsive. What's the matter?

　　If the hair dryer is not powered on, it is necessary to check if the power supply is loose or if the solder joints inside have fallen off. If it is not powered on, it can be easily disassembled and connected by oneself. Generally, if the hair dryer is not powered on, it may be because the solder joints have fallen off. Check first and if it is not working, take it to a repair shop for repair. If the hair dryer suddenly stops working during use, it may be because the temperature is too high and the temperature control device automatically cuts off the power supply. Once the temperature drops, it can be used. If the hair dryer malfunctions, follow the four steps of detection to see what the cause is. 1. Confirm that the power is connected. 2. Confirm that the switch is turned on. 3. Smell if there is any burning. The hair dryer consists of two components, one is the heating part, and the other is the fan part. The current fault is that the fan is not running without air. So we set the hair dryer to the cold air position to separate the heating part from the motor, in order to measure the circuit of the motor part. We set the multimeter to the resistance position and measured its resistance value. We found that the resistance was infinite, indicating that the circuit was not connected and the power supply was not sent to the motor and there was no wind. Fold open the hair dryer and conduct an internal inspection. Measure the circuit and switch, and it is found that the resistance is zero, indicating that the circuit and switch are good. As the electric blower motor is a DC motor, its power supply is provided through the rectifier bridge. Set the meter to the measurement position of the secondary transistor, and measure the rectifier bridge. It is found that two diodes have infinite resistance, indicating that the secondary transistor is damaged. Replace the diode and measure the rectifier bridge. Normal precautions: When measuring, pay attention to separating the heating part from the motor part to accurately measure the fault point.

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