1. VOC (Voice of Customer) Response - Consulting on product function/performance/specifications2. Analysis and On-Site Response for Returned Faulty Products & Field Cause Analysis - Faulty product cause analysis (components, processes, field) - Field site environment investigation (power quality and installation environment) - Deriving improvement measures - Preparing a fault cause analysis report - Registering fault knowledge case studies3. Quality Indicator Management - Free SVC / Claims, etc. - Review of measures to reduce key quality indicators

1. Development Document and Circuit Verification - Review of circuit and development specifications2. Selection of Test and Evaluation Items and Determination of Pass/Fail Status (Review of Improvement Plans → IEC, KC, High-Efficiency Standards) - Development and standardization of reliability test methods/testing technology : Environmental tests (Low temperature, high temperature, humidity tests) : Safety tests (Temperature rise test, withstand voltage test) : Noise tests (Conducted/Radiated Noise tests) : Mechanical tests (Vibration/Shock tests, Transportation environment test) : Protection function tests (Overload test, Overvoltage and abnormal power tests) : SMPS performance verification test : Component tests (Capacitor charging/discharging test, environmental durability test)3. Establishment of Failure Knowledge Base for Testing Issues / Construction and Maintenance of Testing Equipment - Quality Verification of Mass Production Design Changes / Customization of Products4. Obtaining UL Certification for Inverters - UL508C, UL61800-5-1, UL508A, UL945. Investment in Testing Equipment and Calibration Management