A schematic diagram for Sony hardware (board MBX-224). Shared as “SONY MBX-224_M960_M970 REV 1.1 (PDF).pdf” — a .pdf file, 998 KB.
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 @pkbiosbdv. 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)