Transistor documentation for the 2SJ439, stored as a 389 KB PDF and catalogued as a schematic. In JIS numbering 2SJ marks a P-channel FET, pointing to a datasheet with characteristic curves, ratings and an outline drawing. Use it to confirm gate, drain and source pins, check whether operating conditions stay within limits, and compare on-resistance and capacitance with possible substitutes during repair. Since the name gives no package or brand, match the physical part, including suffix letters, before ordering 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.