Think about it in simple terms such as with your car. Oil changes and regular servicing are part of a preventive maintenance schedule that ensures your car runs properly and without unexpected failure.
If you ignore that maintenance schedule and miss service intervals, your car will depreciate in value and utility. The same applies for your office equipment.
With a PM schedule in place, maintenance managers can decrease downtime. However, managers are always cautious of over-maintaining equipment. There’s a point where preventive maintenance starts costing too much in relation to the amount of downtime it prevents.
The optimal amount of preventive maintenance occurs when the cost of corrective and preventive maintenance meet.