A schematic diagram for Apple hardware (board 820-00034). Shared as “820_00034_A_points_and_drawings_are_basically_the_same_as_820_00.pdf” — a .pdf file, 2.35 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)