An 88.2 KB PDF carrying only the designation 2SC3402, catalogued as a schematic but almost certainly a single-part reference sheet. Under JIS naming, 2SC denotes an NPN transistor for high-frequency applications. Expect electrical characteristics, absolute maximum ratings and a package drawing that show which leg is base, collector and emitter. Use it to verify a suspect transistor with a meter in diode mode or to choose an equivalent, and check the body marking against the number before ordering a 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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.