During an electrical storm, a component labeled MFC27 was damaged. It is one of many similar components on the MNL-800 backplane or base circuit board. What purpose does it serve and which circuit was it a part of?
High voltage spikes from an electrical storm. Sample of MFC damage in image below.
All the MFC components on the backplane are Multi-Function Ceramic (MFC) protectors. They are designed to absorb high voltage introduced into the circuit to which they are a part of. In particular, MFC27 protects universal input six (UI 6). See a sample image of MFC damage below.
Although damaged, the backplane can still be used but that specific circuit won't have any further high-voltage protection.