GE FANUC MMI12675 is a CNC control board used in industrial machine tools and robotics, featuring a multi‑channel I/O interface, power supply circuitry, and an embedded processor that drives motion control loops. Common failure modes on this class of units include overheating or failure of the main power supply module, burnt or degraded input/output relays, and corrupted firmware or memory errors that manifest as boot failures or erratic axis behavior. Initial diagnostic steps are: 1) verify proper voltage levels at the board’s power terminals and check for any blown fuses; 2) inspect all I/O connectors and relay contacts for signs of corrosion or mechanical damage; 3) review the control’s error log or status LEDs for specific fault codes that indicate memory, communication, or motor drive issues.[oss-gpt-20b]