Small 84.1 KB PDF whose name, 2SC3792, is a bare transistor designation; it sits in the schematic category, yet the Japanese 2SC prefix points to an NPN bipolar device and hence to a datasheet. No brand, package or specification appears in the name itself. Open it in a standard PDF viewer to read the pinout and limits before desoldering or testing. When the exact part cannot be sourced, the ratings listed here are what any replacement must meet or exceed, so compare carefully against candidate equivalents.
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.