What preventive maintenance procedure might be illustrated in a scenario involving a projector?

The correct choice focuses on the replacement of a projector air filter, which is a key aspect of preventive maintenance for projectors. Preventive maintenance involves regularly scheduled procedures aimed at ensuring that equipment operates efficiently, reduces the risk of unexpected failures, and extends the lifespan of the equipment.

In the case of projectors, air filters play a crucial role in maintaining proper airflow to prevent overheating and ensure optimal performance. Dust and debris can accumulate in the air filter, leading to reduced ventilation, which could ultimately affect the projector's functionality and longevity. Regularly replacing the air filter is essential for preventing these issues, thus falling under the category of preventive maintenance.

The other options involve procedures related to devices that are not specifically tied to preventive maintenance for projectors, and they address different types of equipment. For instance, removing a laptop's hard drive and replacing its battery are actions related to maintenance or upgrades, but they do not illustrate preventive maintenance in the context of projection systems. Similarly, installing an OPS Board in a display pertains to setup or configuration rather than maintenance. Therefore, the focus on the projector air filter highlights the importance of routine upkeep to maintain performance and reliability in projection systems.