For arcade operators, maintaining a fleet of classic and modern machines is an ongoing task. Downtime means lost revenue, so a well-stocked repair cabinet is essential for quick fixes. The most commonly stocked parts reflect the components that endure the most wear and tear from enthusiastic players.

Joysticks and buttons are at the top of every operator's list. These interface components are subjected to constant, intense physical force. Operators keep a supply of both microswitch and leaf-switch joysticks, as well as a variety of concave and convex buttons in multiple colors to match different cabinet designs.

Another critical category is power supplies. The constant heat generated inside a cabinet can degrade power components over time. A failing power supply can cause a myriad of issues, from screen glitches to complete failure to boot. Having a reliable switching power supply on hand is a quick way to diagnose and solve many problems.

For older CRT-based games, monitor components are vital. While complete CRT replacements are now rare, operators stock frequently failing parts like flyback transformers, rejuvenators for the cathode ray tube itself, and cap kits to recap the aging monitor chassis boards, which are a common point of failure.

Other essential spare parts include fuses of various amperages, replacement lamps for marquees and coin doors, and credit buttons. For pinball operators, this list expands to include flipper coils, rubbers, and bulbs. By stocking these common items, operators can ensure their games are earning quarters instead of sitting idle.