Revision 1.0 of the circuit diagram for the Sony MBX-160 motherboard, the board carrying the MS70 project code, supplied as a 1.71 MB PDF. Several revisions of this board exist, so component placement, values and even power circuits can differ between them; compare the revision silkscreened on your PCB before trusting a reading. Any PDF viewer opens it, and searching net names makes it practical for following voltage rails, locating MOSFETs and checking which rail is pulled low by a shorted part.
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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