Systematic troubleshooting for industrial motion control systems. Use for servo/stepper motor issues, positioning problems, homing failures, communication errors, EMI, vibration. Triggers (CN): 故障診斷、馬達問題、原點復歸失敗、定位不準、通訊錯誤、伺服異常. Triggers (EN): troubleshoot, motor issue, homing fail, position error, servo alarm. Coordinated by: project-coordinator.