A professional who inspects, adjusts, and repairs punched-card office machines, such as interpreters, collators, proof machines for banks, and card punches, using handtools and test equipment. Responsibilities include:

• Reads machine assembly specifications, such as charts, blueprints, schematic diagrams, and engineering specifications to determine requirements, such as drive speed, timing of card feed and output, and installation of special features ordered by customer.
• Operates machine, using prepunched cards, to observe and listen to operation of moving parts, to measure clearances and contact gaps, and to measure voltages and continuity, using voltmeter, ohmmeter, and test lights.
• Adjusts clearance of moving parts, electrical contact gaps, and alignment of printing units and contact brush units to meet specifications, using tools, such as screwdrivers, wrenches, feeler gauges, and special fixtures.
• Repairs assembly errors noted by quality control personnel.
• May install hardware, drill holes, and insert pins to complete assembly prior to final testing of machine.
• May train workers in assembly operations.