Under the schematic category, this 99.0 KB PDF titled 2SJ187 should be the datasheet for a P-channel FET, as the JIS 2SJ prefix indicates. It provides the reference data a technician needs to identify leads, verify polarity and compare voltage, current and power ratings against a possible replacement. Equivalents can use different pin orders, so check the outline carefully. The name gives no manufacturer or package information, so match the printed marking of the original part first.
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.