Poor contact of the terminal: the internal metal conductor of the terminal is actually the core part of the terminal, mainly including external wires, cables, signals and currents.It shall be directly transmitted to the connector and contact matched with it, and the contact of the terminal must be excellent in structure,because stable and reliable terminal contacts can effectively ensure the conductivity.However, if the contact of the terminal is structurally,such as unreasonable design, unsuitable material selection, unstable mold, deviation of processing size, rough surface, improper assembly, extremely harsh storage environment, incorrect heat treatment and electroplating process, improper use and so on, above problem will directly affect the poor contact of terminal contacts.
Poor insulation of the terminal: the main function of the insulator in the terminal is to ensure the arrangement position of the contacts, and to ensure mutual insulation between the contacts, as well as between the contacts and the shell. Therefore, the electrical performance of the insulating parts of the terminal must be ensured, mainly including the molding of the process and the mechanical performance. As small terminals are used more and more widely, the insulator is becoming thinner and thinner in terms of effective wall thickness. Strict requirements have been put forward for the selection of terminal insulator materials, the precision of injection mold and the entire molding process. However, there will be excess metal objects on the surface and inside of the terminal insulator, and there will be more dust on the surface, which will lead to breakdown, short circuit Low insulation resistance and leakage.