Apple 820-2914 logic board files in a 3.46 MB RAR archive, larger than most single schematics, which suggests more than one document or a boardview may be included, though the name does not say. Model and revision are not given, so match the 820 number and revision letter printed on the board first. A boardview, if present, opens in OpenBoardView, FlexBV or similar viewers and lets you click a net to see every connected part, which speeds up short hunting and test point location alongside the schematic.
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 @Mac_Shematic_Santale. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.