Sony schematic for the MBX-155 motherboard with the MSS1 project code, marked as revision 0.30. An early revision number like this suggests a pre-production design, so production boards may differ in some parts or values. MBX is Sony's own board numbering, printed on the PCB. The 1.38 MB PDF can be used to trace power rails, check regulator and enable circuits and locate components, but confirm the MBX label and revision on the board first.
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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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.