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Maintenance method of air conditioner circuit board
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1. The overhaul method of the power supply circuit of the air conditioner circuit board
Compared with the power circuit failure of the air conditioner circuit board, its main feature is that the fuse is no problem. We can use the corresponding AC block of the multimeter to detect the primary and secondary of the corresponding transformer to see if it is 220V. And 10-13V voltage. If so, then check 7812 and 7805 to see if they have 12V and +5V voltage. In this way, the corresponding fault location can be distinguished.
2. The overhaul method of the temperature sensing circuit of the air conditioner circuit board
For this thermistor, it is a thermistor related to a negative temperature coefficient, that is to say, the higher the temperature, the smaller the corresponding resistance, but the lower the temperature, the greater the corresponding resistance, when the temperature is 25 When the temperature is high, the corresponding resistance is about 5-20KΩ. We can use the corresponding ohm block of the multimeter to measure the resistance value to judge its corresponding quality. Once the measured resistance value is infinite, or very small, then the thermistor is damaged.
3. The overhaul method of the receiving circuit of the air conditioner circuit board
We turn on the power, and then use the corresponding DC block of the multimeter to measure, and measure the voltage of the power supply terminal and the signal terminal related to the circuit board to the ground. When it is normal, its supply electrode +5V voltage, the corresponding signal electrode The voltage is +2.5V. If it is not the above value, then there is an abnormality. The common fault is the damage of the receiving head or the breakdown of the capacitor. We are not an agent
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