The name of this 92.4 KB PDF consists only of 2SJ255, a Japanese JIS designation where 2SJ marks P-channel FETs. Expect the datasheet of that transistor, even though the index classes it as a schematic. With it a repairer can confirm gate, drain and source pins, check ratings and characteristic curves, and judge whether a cross-reference part is suitable. It opens in any PDF viewer. Compare polarity, package and marking with the original component before soldering in a replacement.
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.