A schematic diagram. Shared as “UX31A2_R2_0_HM7X_RT8239图纸_WSND_MAIN_BOARD_2_1_参考图.pdf” — a .pdf file, 1.10 MB.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @ShareMan_Electronic_Files. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.
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