A schematic diagram for Apple hardware (board 820-00244, 820-00687). Shared as “A1534 820-00244 and 820-00687 are basically the same.pdf” — a .pdf file, 1.64 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)