The Fanuc A06B‑6089‑H101 is an AC servo amplifier (Alpha Series SVU‑1‑12) rated at 12 A, used to drive high‑torque industrial motors in CNC and motion control systems. Common failure points for this model include burned-out MOSFETs or IGBT modules, degraded gate driver circuits, and overheating of the internal heat sink due to inadequate cooling or dust accumulation; these symptoms often present as overcurrent alarms, “overheat” messages, or loss of motor response. First‑check diagnostics: verify that the supply voltage is within ±5 % of spec and that all input signals (PWM, position feedback) are present and clean; inspect the drive for visible burn marks, loose connections, or excessive dust on the heat sink; review the diagnostic log for fault codes related to overcurrent, overheat, or communication errors.[oss-gpt-20b]