Detailed Work Activity Install audio or communications equipment. Repair electronic equipment. Estimate costs for labor or materials. Calibrate equipment to specifications. Confer with customers or users to assess problems. Test electrical circuits or components for proper functioning. Train customers in the use of products. "Travel to work sites to perform installation, repair or maintenance work." "Interpret blueprints, specifications, or diagrams to inform installation, development or operation activities." Read technical information needed to perform maintenance or repairs. Adjust equipment to ensure optimal performance. Maintain repair or maintenance records. Disassemble equipment for maintenance or repair.