PDF schematic for the Apple A1181 MacBook, logic board 820-2279 at revision A. Apple's 820-xxxx numbering identifies the specific logic board, so the number printed on the PCB is more reliable than the model A number when confirming a match. The schematic shows power rails, regulator circuits, signal paths and component designators across numbered pages. Any standard PDF reader opens it, and pairing it with a matching boardview speeds up locating parts and measuring voltages on the bench.
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 @schematics_boardview. 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.