The part number 2SJ466 is the only detail in the name of this 40.0 KB PDF, tagged as a schematic. JIS designation 2SJ means a P-channel FET, so the file is expected to be a brief transistor datasheet rather than a device circuit. It gives the figures needed when replacing a suspect switch: breakdown voltage, current rating, threshold and on-resistance, plus pin layout. Open it in any PDF viewer, and confirm the package and suffix on the original component, as these determine whether an exact match is required.
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.