PDF of 104 KB for the 2SD1238L, catalogued as a schematic. The 2SD prefix is the JIS marking for NPN transistors in low-frequency applications, and the trailing L appears in the name without further explanation, so read the document to see what variant or package it refers to. Content normally includes maximum ratings, gain groups and an outline drawing. Compare the pinout with the board before soldering, since a mismatched lead order can destroy the replacement at power-up.
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.