A 135 KB PDF identified only by the part number 2SC3787. While the index files it as a schematic, the JIS designation 2SC indicates an NPN bipolar transistor, which makes a datasheet the likely content; the name does not state the manufacturer or package. Repair use centres on reading pinout and absolute maximum values, then comparing them with an available equivalent when the original is out of production. Check the case marking on the faulty part and confirm the package outline before soldering in 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.