Some switches allow repairers to diagnose and correct problems from remote locations. When faced with a malfunction, the repairer may refer to manufacturers' manuals that provide maintenance instructions. PBX repairers determine if the problem is located within the PBX system, or if it originates in the telephone lines maintained by the local phone company. To fix the equipment, repairers may use small hand tools, including pliers and screwdrivers to replace defective components, such as circuit boards, fuses, or wiring. They may also install updated software or programs that maintain existing software.
Radio mechanics install and maintain radio transmitting and receiving equipment.
This includes stationary equipment mounted on transmission towers and mobile equipment, such as radio communications systems in service and emergency vehicles. Newer radio equipment is also self-monitoring and may alert mechanics to potential malfunctions. When malfunctions occur, these mechanics examine equipment for damaged components and loose or broken wires. They use electrical measuring instruments to monitor signal strength, transmission capacity, interference, and signal delay. Additionally, they use hand tools to replace defective components and parts and adjust equipment, so it performs within required specifications.