An 86.9 KB PDF identified by the part number 2SJ231 alone. Under Japanese JIS designation, 2SJ covers P-channel FETs, so this is most plausibly a transistor datasheet even though it sits in the schematic category. Repairers consult it for pin order, drain-source voltage, current and power ratings, and package dimensions when replacing a shorted or open device. It opens in any standard PDF reader. Verify that any equivalent matches polarity, package and pinout before soldering.
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.