Labelled only 2SJ254, this 93.0 KB PDF is filed as a schematic but almost certainly describes one discrete component: the 2SJ prefix in the JIS system denotes a P-channel field-effect transistor. The sheet should provide absolute maximum ratings, electrical characteristics and a package drawing, which help when measuring a suspect device or choosing an equivalent. Any PDF reader displays it. Confirm the marking on the failed part and the pin order of the substitute before installing it 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.