Diagnosing issues in classic arcade machines requires specialized tools to identify and fix problems efficiently. The most common diagnostic tools used by technicians and enthusiasts include arcade PCB testers, voltage multimeters, logic probes, and control interface testers. Arcade PCB testers are dedicated devices that check the main printed circuit board for faults by running diagnostic routines and identifying faulty chips or connections. A voltage multimeter is essential for measuring electrical values at various points on the board to detect power supply issues or component failures. Logic probes help in testing digital circuits by indicating logic states (high or low) to pinpoint malfunctioning ICs. Control interface testers verify the functionality of joysticks, buttons, and other input devices by simulating inputs and checking responses. These tools form the core arsenal for maintaining and repairing arcade cabinets, ensuring accurate troubleshooting of both hardware and electrical problems.