A schematic diagram for Apple hardware (board 820-3213, 820-3208). Shared as “820 3213 (LIO Board for 820 3208 J11).pdf” — a .pdf file, 3.14 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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)