The 2SJ287 is covered in this 96.7 KB PDF. Only the part number is present in the name, so no equipment details can be given. Japanese JIS codes use 2SJ for P-channel field-effect transistors, and the document is likely a standard datasheet. Use it for pin identification, gate threshold and drain current limits while diagnosing a switching circuit. Measure the part out of circuit if readings in place are unclear, and match package and specifications for any 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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.