Troubleshoot 24 VDC and 120/208/240/480 VAC circuits, control panels, power supplies, relays, contactors, circuit breakers, fuses, transformers, motors, variable-frequency drives, and machine wiring. Use multimeters, clamp meters, insulation testers, signal simulators, pressure and vacuum gauges, calipers, micrometers, torque tools, and alignment instruments to diagnose and verify repairs.