Repair archive for Apple board 820-2879, a 1.45 MB zip with no model or revision in its name. Expect schematic and possibly boardview data for this logic board inside. Technicians use these files to follow how power rails come up, check component values, locate test points and trace signals when diagnosing no-power or no-video faults. PDF schematics open in standard readers and boardview files in OpenBoardView or FlexBV. Confirm the 820 number and revision printed on the PCB match before trusting the data.
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.