Common malfunctions include paper misfeeds, due to worn or dirty parts, and poor copy quality, due to problems with lamps, lenses, or mirrors. These malfunctions can usually be resolved by simply cleaning components. Breakdowns may also result from failure of commonly used parts. For example, heavy usage of a photocopier may wear down the printhead, which applies ink to the final copy. In such cases, the repairer usually replaces the part, instead of repairing it.
Workers use a variety of tools for diagnostic tests and repair.
When diagnosing computerized equipment, repairers also use software programs. To repair or adjust equipment, workers use hand tools, such as pliers, screwdrivers, soldering irons, and wrenches. Because computers and office machines are sensitive to extreme temperatures and to humidity, repair shops are usually air-conditioned and well ventilated. Field repairers must travel frequently to various locations to install, maintain, or repair customer equipment. ATM repairers may have to perform their jobs in small, confined spaces, which house the equipment.