Version 2.0 schematic for the MSI MS-7399 mainboard, delivered as a PDF of about 1.1 MB. The MS- prefix with four digits is the numbering MSI applies to its own desktop motherboards. Use it to check supply voltages at each regulator, trace signals between chipset and connectors, and locate components when hunting a short. Since several MS-7399 versions exist, confirm that the PCB carries the 2.0 marking before trusting designators, as layout and part values can shift between board revisions.
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 @pepeelectronica. 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.