Archive for the Apple board 820-00239, 6.15 MB, which is larger than most packs here and may hold several files. The name gives no Mac model, revision or content list, so look inside first. Apple's 820 numbers identify the logic board and are printed on the PCB, which makes them the safest way to match documents to hardware. Schematics and boardviews like these are used to trace power rails, check power sequencing and find a short to ground. Boardview files open in viewers such as OpenBoardView or FlexBV.
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 @notebookschematic. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.