Part code 2SC3422 is the only clue in this 176 KB PDF filed as a schematic. The 2SC series in the Japanese JIS system covers NPN bipolar transistors, making a component datasheet the likely content. Technicians use it to read voltage, current and power limits, identify the pins, and check whether a cross-reference equivalent is adequate. Verify the body marking and any gain-rank letter on your part, as the name gives no grade, package or maker.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)