PDF schematic for the IBM ThinkPad A30, roughly 986 KB in size. No board number or revision is given in the name, so confirm that the drawing matches the planar in your machine before using its values, as the closely related A31 uses a different board. Technicians use these diagrams to follow the power path from the adapter input to the system rails, check voltages at test points, and identify components around a short. Any PDF reader opens the file, and searching for net names simplifies tracing between sheets.
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 @cyberlanelectonik. 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.