A 2.06 MB schematic in PDF format labelled X61C; the name carries no brand, board number or revision, so identifying the exact machine requires checking the drawing's title blocks against your board. Use it to follow power rails from the charger and regulators to the loads, trace signal lines, and look up reference designators when replacing parts. A C suffix may mark a variant of an X61 design, so confirm parts and layout match before relying on component values.
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 @ITHINKHS. 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)