Even with preventive and diagnostic maintenance, the computer system may break down, and repairers have to quickly find and correct the problem. They use their knowledge of electronics theory and computer circuitry to analyze the problem, troubleshoot the system, and find the problems. Technicians usually have a number of sophisticated test instruments to run special diagnostic programs and help pinpoint breakdowns. Although diagnosing problems with computer systems may be complicated, doing the actual repairs may be simply a matter of replacing a defective printed circuit board or soldering a broken connection. Repairers use various hand tools, such as needle nosed pliers, wire strippers, and soldering equipment to repair them.
Repairers often help install and get new computer systems ready.
They hook up electrical connections between machines, test the new equipment and may lay cables. They also keep complete maintenance and repair records for each installation, keep parts inventories and order needed parts, fill out time and expense reports, and may give training and technical advice to the customer. Most service repairers work for computer manufacturers or computer maintenance service companies. They make scheduled maintenance visits and handle emergency repairs which may include a lot of driving. In some cases, large systems are serviced by more than one repairer.