A schematic diagram for Lenovo hardware (board NM-A271). Shared as “Compal_NM_A271_ACLU1&ACLU2_G40_70.pdf” — a .pdf file, 1.25 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 @abgm_manutencao_esquemas. 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.