The Sinano C020A2E AC Servo Motor AMP is a high‑current servo amplifier used to drive sinusoidal AC motors in industrial CNC or packaging equipment. Common failure points for this class include overheating of the MOSFET array, insulation breakdown between phase windings, and failure of the internal protection ICs that trigger over‑temperature or short‑circuit shutdowns. Initial diagnostics should verify the 400 V supply rails are within spec, check for visible burn marks or melted components on the PCB, and review any fault codes from the motor controller or drive interface. If the unit passes these checks, proceed to measure phase currents and inspect the motor connector pins for continuity and proper grounding.[oss-gpt-20b]