Arcade operators maintain perfect gameplay through meticulous calibration processes. They begin with voltage calibration using multimeters to ensure power supplies deliver exact voltages to PCBs, preventing graphic glitches and system crashes. Monitor calibration involves adjusting horizontal and vertical hold, brightness, and contrast using specialized test patterns to achieve crisp, stable visuals. For joysticks and controls, operators physically adjust tension springs, microswitch alignment, and restrictor gates to ensure precise movement and responsive inputs. Audio systems undergo tuning using decibel meters to balance sound effects and music without distortion. Operators regularly perform preventive maintenance including cleaning optical sensors, lubricating mechanical parts, and replacing worn components before failures occur. Modern arcades utilize diagnostic mode access through hidden service buttons to run automated tests and adjust software-based settings. Seasoned operators document each machine's ideal settings for quick restoration after component replacements, ensuring consistent player experience across all cabinets.