The AC‑07 is a Custom Servo Motors Inc. servo amplifier designed for industrial motor control applications, typically driven by an AC power source and interfaced with a controller via analog or digital signals. Common failure points in this class of units include overheating of the output MOSFETs, degradation of the internal protection circuitry (over‑current/over‑temperature), and loss of communication due to damaged I/O connectors or firmware corruption. Begin troubleshooting by verifying that the unit receives correct line voltage and proper grounding, then check all input/output signal levels against specification; inspect for visible signs of burn marks or component damage on the board, and review any diagnostic error codes from the host controller.[oss-gpt-20b]