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MTJ-88901-FSE-001 RJ45 Modular Telephone Jack 8P8C Right Angle Shlelded

Why does RJ connector appear false soldered RJ connector? We opened the RJ connector, and we saw that the solder joints were fake soldering, or the copper wire coil was broken. Why is this? It is fully testable on the RJ manufacturing end. But why are they leaked to the client application before they are discovered?
The first is the RJ connector itself. RJ connector with false welding, although its circuit connectivity can achieve basic connection, it is not in good condition. As the environment changes, such as the influence of temperature or humidity on it, its connection performance becomes worse and worse, and then it will cause an open circuit. RJ connectors with damaged wires (commonly used 38# and 39# wires, which are relatively thin, and may be damaged at the manufacturing end). Secondly, its line connectivity is not in good condition although basic connections can be achieved. Similarly, as the environment changes, such as the influence of temperature or humidity on it, its connection performance becomes worse and worse, which will cause an open circuit.