This 89.0 KB PDF carries no information except the code 2SJ233. JIS numbering assigns 2SJ to P-channel FETs, so the content is most likely that transistor's datasheet rather than a device schematic, regardless of the catalogue type. Technicians use it to check pinout, voltage and current limits, on-resistance and outline dimensions while diagnosing power or audio circuits. Open it in any PDF viewer. Ensure any replacement matches channel type, ratings and lead arrangement of the original.
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.