The 2SJ106 is the only detail in this 283 KB PDF name. JIS numbering reserves 2SJ for P-channel field-effect transistors, so the document is best treated as a datasheet rather than a board schematic. It should give pin identification, maximum voltage, drain current and dissipation figures. Consult it before measuring the part in circuit and when sourcing an alternative, and verify that the marking on the component matches the variant covered.
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)