The 2SJ577 is the subject of this 41.1 KB PDF, filed under schematics but named like a transistor datasheet. According to the JIS designation system, 2SJ stands for a P-channel FET, a device type often used as a high-side or load switch. Consult it for pin order, gate threshold, on-resistance and absolute maximum ratings when diagnosing or replacing the part. No brand, package or revision is given in the name, so confirm the code and footprint on the board.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)