Latest Updates on PCB Fabrication and Circuit Board Maintenance

1. The thermistor discussed here has a negative temperature coefficient, meaning its resistance decreases with rising temperature and increases with falling temperature. At 25°C, the resistance typically ranges from 5-20KΩ. You can check its condition by using the ohm block on a multimeter to measure the resistance. If the reading shows infinite resistance or a very low value, the thermistor may be damaged.

2. When overhauling the receiving circuit of an air conditioner circuit board, start by powering it on. Use a multimeter with a DC block to measure the voltage between the power supply terminal and the ground, as well as between the signal terminal and the ground. A normal supply voltage is around +5V, while the signal voltage should be approximately +2.5V. Any deviations from these values could indicate issues, often caused by a damaged receiving head or a faulty capacitor.

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