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Improvement of an automatic wire feeding machine in a de-soldering process
unpublished
This paper presents the de-soldering process for rework of hard disk drive head stack assembly (HSA) units. An automatic wire feeder was used to place tin (Sn) onto the product. Improper feeding was determined to be one of the major causes of defective parts that had excessive amounts of Sn on the HSA. The defective parts due to the excessive amount of Sn were found to exceed 30% of production, which led to increased processing time and costs, since additional cleaning steps were needed. From
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