PDF of about 99 KB for the 2SC4770, filed under schematics though the name points to a transistor datasheet rather than a board diagram. The 2SC prefix in Japanese JIS numbering identifies an NPN high-frequency transistor. Expect pin assignment, absolute maximum ratings, electrical characteristics and package drawings, which help when checking a suspected short with a multimeter or picking an equivalent. Confirm the body marking on the board matches before relying on the figures, since abbreviated markings can be ambiguous.
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.