A 349 KB PDF named for the 2SC2670 transistor and catalogued as a schematic, most likely containing the device datasheet. JIS 2SC numbering identifies NPN bipolar parts. The name lists no maker, package or rank. Repair use centres on pinout identification, absolute maximum ratings and gain data, all of which help when testing in circuit or picking a replacement from stock. Opens in any PDF reader. Make sure the transistor marking on the board matches before applying these specifications.
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.