IBM ThinkPad X61 notebook schematic, stored as a 1.42 MB PDF. Apart from the model, the name states no board number or revision, so compare the drawing with what is printed on your motherboard before using values from it. Technicians use these pages to trace power distribution, follow the enable and power-good signals that bring the board up, and locate the part responsible for a shorted rail. A file of identical size exists under a slightly different name, so one copy is probably enough.
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 @alischematics. 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.