The Index Capability Quality Control System on Smartphone Wave Performance

This study aims to evaluate the effectiveness of wave quality control in mobile phone products using conventional control charts which are considered less optimal. The Severity, Occurrence, and Detection multiplication methods are applied to find the risk value, while the Capability Index (Cpk and Cp) are used to evaluate process capability. Root cause analysis is carried out using Fault Tree Analysis (FTA) and Fishbone Diagram to identify the causes of wave quality nonconformities. The results of the study indicate that the control chart has not been able to detect fluctuations, and is less effective in finding disturbances that can change Testing capabilities. The combination of FMEA, Cpk, Cp, FTA, and Fishbone Diagram provides a more comprehensive approach to determine that process stability and consistency that can be improved. This study contributes to the development of a more robust quality control system, supports production efficiency, and increases customer satisfaction.