WHAT – Corrective maintenance is the emergency servicing in response to the development of a fault. This maintenance is normally unscheduled and will require logical reasoning and good organization for an efficient troubleshooting. It is vital that the engineer can understand the circuits in which they are working on and how these circuits function to ensure smooth running for the system.
WHEN – On top of corrective maintenance during emergencies, it can also be performed when a fault is found during a preventive maintenance visit. This is possible as with many systems, the engineer can be guided by the control log or displays that will remind or alert them of malfunctions. In layman’s terms, corrective maintenance can be done when (a) an error occurs and troubleshooting must be done or (b) an error is discovered during servicing.
WHY – Corrective maintenance is necessary as most devices incorporate semi-conductors, diodes, transistors and integrated circuits, which in principle are reliable but will always have a small tolerance for malfunctions as they are manufactured in large volumes. Furthermore, corrective maintenance must also be performed to retain the future maintainability and service of the devices as well as to retain their market potential so that improvements in reliability can ge gained.