Circuit diagram for the Lenovo E40 notebook in PDF form, 1.38 MB, apparently the same document as the copy with the -1 suffix. The name gives no motherboard number or revision, so confirm the board coverage from the schematic's title pages. Technicians use such a file to follow signal nets between pages, measure voltages against expected values and locate parts near suspected faults. As E40 units may use different boards, check the number silkscreened on the PCB first.
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.