Duplicate copy, numbered three, of the Sony MBX-224 archive for M960 and M970, H model, revision SA, sized 952 KB. Contents are likely identical to the other copies, but a quick comparison avoids surprises. The schematic inside helps technicians follow power paths, examine signal routing and find components and test points during board-level repair. The H model is a different board from the L model, MBX-223, so check the number silkscreened on the PCB along with the revision before measuring.
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 @generalschematics. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.