Arcade game machines, whether classic cabinets or modern units, require specialized diagnostic tools to identify and fix hardware issues efficiently. The most common types of diagnostic tools used by technicians include multimeters, logic probes, and CRT testers. A multimeter is versatile, measuring voltage, current, and resistance to check power supplies and circuit continuity. Logic probes help test digital circuits by detecting high/low logic states, making them ideal for troubleshooting game boards and chips. For monitors, CRT testers assess cathode-ray tube components to diagnose display problems like flickering or no image. Additionally, specialized tools like EEPROM programmers and oscilloscopes may be used for advanced repairs. These tools enable precise diagnostics, reducing downtime and ensuring reliable operation for arcade enthusiasts and operators.