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This study aims to identify the types and causes of defect, and also provide recommendations for improvements to reduce and prevent defect in the optical fiber coloring process. The fault Tree Analysis (FTA) Method is used in this study to identify the relationship between the causative factors and the shape of the fault tree. The Failure Mode and Effect Analysis (FMEA) method is used to analyze the causal factors identified by the FTA method. The results of the FTA Method show that the dominant defect type that occurs in the optical fiber coloring process is stripped fiber. The percentage of striped fiber defects is 36% which caused by machine, material, and method factors. The final result of the Failure Mode and Effect Analysis (FMEA) method is the highest Risk Priority Number (RPN) value, namely clogged ink housings (dies) with an RPN value of 294.

Quality Improvement on Optical Fiber Coloring Process using Fault Tree Analysis and Failure Mode and Effect Analysis