Power sequence sheet for the Sony MBX-165 board, MS90 project, rather than a full schematic, as the small 35.8 KB size also suggests. Such a document shows the order in which rails and enable or power-good signals come up after the power button is pressed. It is valuable when a laptop powers partially and stops, since checking each step tells you where the chain breaks. Use it alongside the full MBX-165 schematic and confirm the board number on the PCB 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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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.