Analyze the disassembly of the defective product sent back by the customer: the internal wire of the coil is broken. When the coil is wound, the tension is large, which leads to the tightness of the coil. When it is immersed in Van Li water and baked, it is in a constant state of interruption. It is detected as a energized condition inside the factory, and it is completely disconnected after transportation vibration.
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