A 53.1 KB PDF referencing the 2SC3902, an NPN bipolar transistor under JIS numbering, where 2SC marks that device class. Only the part number is given in the name, so treat the file as a datasheet rather than a board schematic. Its ratings, characteristic tables and package drawing let a technician confirm which pin is which, judge whether a measured short means a failed part, and choose an equivalent replacement. Check package type and marking on the board first, as similar numbers can differ.
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.