Motherboard schematic for the K42JV notebook, revision 2.0 as stated in the file name, supplied as a 2.44 MB PDF. Having the revision explicit makes it easier to match against the board, but still confirm the version silkscreened on the PCB. The drawing helps with tracing power rails from the DC jack, checking the power-up sequence, locating test points and identifying components on a shorted net. Searching the PDF for net names or reference designators speeds up finding the relevant page.
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 @schematicslaptop. 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.