Printed circuit assemblies of word processing machines of 8472.90.50
Parts and accessories (other than covers, carrying cases and the like) suitable for use solely or principally with machines of headings 8470 to 8472: > Parts and accessories of the machines of heading 8472: > Printed circuit assemblies of word processing machines of 8472.90.50
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 8473.40.21.00
Word Processing Floppy Disk Controller Board
Printed circuit assembly controlling 5.25-inch floppy disk drives in legacy word processing machines under 8472.90.50. It handles data read/write for document storage, classified in HTS 8473.40.21.00 due to its principal suitability for those specific machines. Essential for non-volatile storage in pre-hard drive era word processors.
Word Processing Printer Interface Assembly
Printed circuit assembly for connecting and controlling dot-matrix printers in 8472.90.50 word processing machines. It manages parallel port protocols for high-speed text printing, under HTS 8473.40.21.00 as a dedicated part. Optimized for continuous form paper handling in office environments.
Word Processing Power Management Board
Printed circuit assembly regulating DC power distribution within 8472.90.50 word processing machines, including voltage regulation for logic circuits. Classified in HTS 8473.40.21.00 for sole use with those machines. Prevents overheating in continuous text processing operations.
Word Processing Machine Audio Output PCA
Printed circuit assembly for beep tones and voice synthesis in 8472.90.50 word processing machines, alerting on errors or status. Classified HTS 8473.40.21.00 for principal use in those dedicated devices. Used in models with integrated speech for proofreading.
Word Processor Expansion Bus Interface Board
Printed circuit assembly providing proprietary bus slots for peripherals in 8472.90.50 word processing machines. Enables add-ons like modems, under HTS 8473.40.21.00 as a core part. Supports NuBus or similar legacy architectures.
Word Processing Display Driver Assembly
Printed circuit assembly driving monochrome CRT displays in 8472.90.50 word processing machines, optimized for 80-column text. HTS 8473.40.21.00 due to exclusive suitability. Handles character generator ROM for fixed fonts.
Word Processor Modem Interface PCA
Printed circuit assembly interfacing 300-baud modems for file transfer in 8472.90.50 word processing machines. Classified HTS 8473.40.21.00 as dedicated comms part. Supports Hayes-compatible protocols for early networks.
Word Processing CPU Daughterboard
Printed circuit assembly mounting the Z80 or 8086 CPU for 8472.90.50 word processing machines. HTS 8473.40.21.00 for principal processor role. Includes clock generator and cache.
Word Processor Hard Drive Controller PCA
Printed circuit assembly for MFM hard disk controllers in late-model 8472.90.50 word processing machines. HTS 8473.40.21.00 as storage interface part. Supports 10-20MB drives.
Word Processing Mainboard Assembly
This printed circuit assembly serves as the main motherboard for word processing machines classified under 8472.90.50, integrating CPU, memory, and I/O controllers. It falls under HTS 8473.40.21.00 because it is specifically designed as a part for those dedicated word processors, handling text processing and display functions. The assembly ensures compatibility with the machine's proprietary architecture.
Word Processor Video Controller PCA
A printed circuit assembly dedicated to video output and display control in word processing machines of 8472.90.50. It manages CRT or early LCD rendering for text editing interfaces, fitting precisely under HTS 8473.40.21.00 as a specialized part. This PCA ensures high-resolution text display unique to dedicated word processors.
Word Processor Keyboard Interface PCA
This printed circuit assembly interfaces the specialized keyboard of word processing machines in 8472.90.50, decoding key matrices for text input. Classified under HTS 8473.40.21.00 for its principal use solely with those machines. Supports dedicated function keys like word wrap and formatting.
Word Processor Memory Expansion PCA
Printed circuit assembly providing RAM expansion slots for word processing machines of 8472.90.50, supporting larger document buffers. Falls under HTS 8473.40.21.00 as a principal accessory for those specific devices. Typically uses proprietary SIMM modules for 1980s-era systems.
Word Processor ROM Firmware Assembly
Printed circuit assembly housing EPROM chips with firmware for 8472.90.50 word processing machines, containing OS and application code. Under HTS 8473.40.21.00 as a dedicated part enabling machine boot and operation. Supports word processing-specific algorithms like spell-check.