The function and precautions of the knob circuit board glue?
One is to glue the circuit board and the PE waterproof sleeve together, and it is not easy to fall off; the other is to play the role of waterproof and moisture-proof to protect the circuit board. It should be noted that there must be no air bubbles when gluing. After gluing, the circuit board needs to be placed in the ventilation for quick drying.