Only the transistor number 2SJ259 appears in the name of this 99.0 KB PDF. JIS coding uses 2SJ for P-channel FETs, which suggests a datasheet even though the file is typed as a schematic. Such a sheet lists absolute maximum ratings, electrical characteristics and the outline drawing, letting a repairer test the device out of circuit or find an equivalent. It opens in any PDF viewer. Before trusting a replacement, check the original part's marking and compare the pin layout shown for its package.
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.