Schematic for the Lenovo ThinkPad X200, supplied as a 1.23 MB PDF, without a board number or revision in its name. Check the title block inside the document and the motherboard silkscreen to make sure the revision matches your unit. Technicians use it to trace the power-on sequence, standby and main rails, charging circuit and embedded controller signals, and to locate parts feeding a shorted rail. A second X200 file of identical size exists in this index, so compare their contents to decide which one fits your board.
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 @smschematics. 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.