As part of the field/customer repair operation, PCA’s (Printed Circuit Assembly) are received as defective material in many cases having large amount of dust and/or contamination particles incrusted in them. This is due mainly to the years of operation where they receive little or no maintenance inside their products. When they are received as defective parts, the process is to thoroughly clean them in order for them to be able to be repaired and sold as spares parts.
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Castillo, Joel J., "PCA (Printed Circuit Assembly) and Electronic Devices Cleaning Station", Technical Disclosure Commons, (January 21, 2019)