A schematic diagram for Apple hardware (board 820-3115). Shared as “vinafix.com_J30 820-3115-B 051-9058.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 @generalbios. 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)