Archive for the Apple board 820-00138, revision A, 1.97 MB. The name carries no Mac model or file list, so check whether it contains a schematic, a boardview or both. Apple prints its 820-series numbers and revision letters on the logic board, and they must match before part references can be trusted. A technician uses such files to follow power rails, check enable signals, locate test points and find the component causing a short. Boardviews open in OpenBoardView or FlexBV, and schematics in any PDF viewer.
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.