PDF documentation for the 2SC3929 transistor, 54.1 KB, suffixed _E and filed under schematics. The JIS numbering pattern 2SC marks an NPN device, usually rated for high-frequency work, so the contents should be a datasheet covering ratings, characteristics and package drawings. Use it to check which pin is which when testing with a multimeter in diode mode, and to verify that any cross-reference part meets the original limits. Ensure the package and marking on the board correspond to this part number.
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.