2. Handling method of poor contact of socket: General socket may have poor contact due to its own quality problems or service life, so the socket can be removed according to the specific fault reasons. Due to frequent use or long service life, the contact copper sheet is deformed. If the copper sheet has not lost its elasticity, tools such as pliers can be used to shape the copper sheet to a suitable state. Because the fixing screws are often loose, it is only necessary to re-tighten the fixing screws. If the contact copper sheet of the socket has lost its elasticity, it is not recommended to maintain it, and a new socket should be replaced to eliminate the hidden danger of short circuit.