8473.40.21.00 - Printed circuit assemblies of word processing machines of 8472.90.50

This HTS category, 8473.40.21.00, specifically classifies printed circuit assemblies (PCAs) that are designed for and exclusively or principally used with word processing machines classified under subheading 8472.90.50. A printed circuit assembly is an electronic circuit board populated with components, forming the essential functional core of the word processing machine. These PCAs contain the integrated circuits, resistors, capacitors, and other electronic elements necessary for the machine's operations, such as data input, processing, and output.

This classification distinguishes itself from its siblings by its precise function and the specific type of machine it supports. Unlike subheading 8473.40.10.00, which covers PCAs for automatic teller machines, this category is exclusively for word processing machines. Furthermore, it differs from 8473.40.41.00, which broadly covers "other" parts and accessories for machines of 8472.90.50, by specifically focusing on the printed circuit assemblies themselves, rather than other components like casings, keyboards, or displays.

As a leaf node, this category does not have further subcategories. Therefore, classification within 8473.40.21.00 is determined by the nature of the printed circuit assembly and its confirmed intended use solely or principally with a word processing machine falling under the designated parent heading. This ensures that essential electronic components integral to the function of these specific machines are correctly identified and accounted for in trade.