PCB diagram in PDF form for a model labelled NP Q30, a prefix that matches Samsung's NP notebook naming, though the name itself gives no board number or revision. At 10.7 MB it is likely a full multi-page schematic set. Technicians use such diagrams to trace power rails, follow signal paths between the chipset and connectors, and find which components sit on a shorted line. Any PDF viewer opens it; confirm the model and board revision printed on the PCB match before relying on part values or net names.
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.