Bearing only the number 2SC3785, this 84.2 KB PDF is indexed as a schematic, though the JIS 2SC prefix identifies an NPN bipolar transistor and suggests a datasheet instead. The name states no maker, package or ratings. Open it in any PDF viewer when testing a suspect transistor, confirming pin order before installation or cross-referencing to a part you can actually buy. Ensure the substitute meets or exceeds the listed limits, and double-check the printed code on the original component.
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.