A schematic diagram for Lenovo hardware (board NM-D471, NM-D472, NM-D474). Shared as “NM-D471 - NM-D472 - NM-D474 PDF.pdf” — a .pdf file, 1.59 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 @pkbiosbdv. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.