A second copy of the M931 (IRX-5300) schematic for Sony motherboard MBX-215, slightly larger at 1.01 MB, so it may be a different scan or revision of the same document. Keep it alongside the other version and compare pages if details disagree. The diagram helps when measuring rails against expected voltages, identifying which IC controls a dead line, and checking pull-ups on the EC and SPI bus. Match the board label and revision on the actual PCB, as M930 and M931 builds share the MBX-215 number but can differ.
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 @schematicslaptop. Enginerys does not host this file.
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The same file was posted more than once. If one link is dead, try the next.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.