Integrating a built-in diagnostic display is a critical design decision for modern arcade machines, significantly enhancing serviceability and reducing downtime. The primary consideration is the physical placement of the diagnostic screen. It must be easily accessible to technicians yet discreet enough not to disrupt the player's immersive experience. A common solution is locating it on the interior of the cabinet, visible only when a service panel is opened, or utilizing a small, secondary LCD.

The diagnostic system's functionality is paramount. It should provide real-time monitoring of core components such as the PCB, power supply, input devices (joysticks, buttons), and audio amplifiers. The display must present clear, actionable error codes and system status reports—like voltage readings or button input registration—rather than raw, incomprehensible data. This allows operators to quickly identify if a problem is hardware or software-based.

The user interface design for the diagnostics must be simple and intuitive. Navigation should be possible using the arcade cabinet's own controls, without requiring external peripherals. A hierarchical menu system is often most effective. Furthermore, incorporating data logging capabilities is essential. The system should record error history, which technicians can review to identify recurring issues and perform preventative maintenance.

Finally, durability is key. The diagnostic display and its connecting hardware must be as robust as the rest of the arcade cabinet, capable of withstanding the vibrations and environmental conditions of a busy arcade floor. By carefully considering these factors—placement, functionality, UI, and ruggedness—manufacturers can create arcade machines that are far easier and more cost-effective to maintain throughout their operational lifespan.