With the advances in the world market and competitiveness among business organizations, there was a need to insert the use of Quality Tools in organizations. Such tools were developed to help professionals understand the problems that occur in their daily lives, in order to find the root cause and propose appropriate solutions for them. In this sense, this research aims to analyze the causes of the main welding failures in the SMT process and propose improvement actions in the assembly of printed circuit boards for fiber optic modems, in an electronics industry in Manaus, through the organizational tool 5W2H. For this, a case study was carried out, through field research, in a company in the Industrial field of Manaus. And, for the prioritization of defects in the SMT process of Fiber Optic Modem production, the Verification Sheet and the Pareto Diagram were used. Among the results, it was identified that the largest number of defects is the failure of insufficient soldering in the T300/T301 component, totaling 81.2% of the defects found. To solve the defects, it was applied: the implementation of adjustment in the assembly coordinate of the components, creation of a new stencil with “overprint” and “step up” and increase in the assembly tolerance with variation of reading of the component terminal. In this way, the adoption of quality tools with the aid in the analysis and solutions of defects facilitated the monitoring of the process, as well as the reduction of product defects, in addition to minimizing rework, thus expanding the guarantee of product quality. and of the process.
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