An 82.4 KB PDF bearing only the part number 2SJ188; the 2SJ prefix in Japanese numbering denotes a P-channel field-effect transistor, so this is likely its datasheet despite being indexed as a schematic. Look in it for pin configuration, ratings and characteristic curves when testing or replacing the device. Any PDF viewer opens it. No manufacturer or package is stated in the name, so confirm the marking and body style on the board before relying on its figures or choosing a substitute.
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.