Schematic PDF of 1.53 MB titled Z470 989 PCH, where PCH refers to the Intel Platform Controller Hub section and Z470 and 989 are likely the model or board identifiers, though the brand is not named. Open it in any PDF reader to trace power rails, strap resistors, clocks and signals around the chipset. It is useful when checking chipset power sequencing or a short on a PCH rail. Verify that the board markings match these identifiers before following the circuit details.
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 @cyberlanelectonik. 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.