PDF schematic, 915 KB, for a board coded M9A0 with an MP tag, which marks the Mass Production revision, the final released design. The name does not state the brand or device, so read the title block to confirm the manufacturer and board number. Use it to trace power rails, follow signal paths and locate components and test points when diagnosing no-power or short faults. Another, slightly larger copy with the same code exists, so compare revisions and match them to the PCB.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.