Only the part number 2SC3361 appears in the name of this 129 KB PDF, so no equipment or board can be identified from it. Under JIS conventions the 2SC prefix designates an NPN high-frequency bipolar transistor, meaning the document is very likely its datasheet. Repair work uses it to confirm which pin is which, check voltage and current limits, and compare gain classes when selecting a substitute. It opens in any PDF reader; match the package and marking on the actual part first.
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.