A schematic diagram for Apple hardware (board 820-3126). Shared as “AFS APPLE A1311 K60 820-3126-A.pdf” — a .pdf file, 2.24 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 @afsschematicfree. 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)