A schematic diagram for Sony hardware (board MBX-155). Shared as “SONY_MSS1_MBX-155_-_REV_0.30 PDF.pdf” — a .pdf file, 1.38 MB.
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)