This maintenance manual provides instructions for maintaining FANUC Series 0i-D and Series 0i Mate-D CNC systems. It describes the display and operation screens, hardware configuration, input/output of data, interface with the PMC, embedded Ethernet function, servo and spindle tuning, troubleshooting procedures, and preventative maintenance of motors, detectors, and amplifiers. The manual also includes appendices with alarm lists, lists of maintenance parts, and information on boot systems, memory cards, LED displays, and memory clearing.