A 40.9 KB PDF titled 2SC3937 with the _E suffix often used for English versions of Japanese datasheets, listed here under schematics. The part number follows JIS convention, where 2SC means an NPN bipolar transistor; no maker or package is given. Repair use centres on the pinout, voltage and current limits and hFE ranking, needed to test the device and select a suitable replacement. Before substituting, verify that the printed C3937 code and package match the drawing.
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.