Specifications for the 2SC3656 in PDF form, 90.4 KB. Parts beginning with 2SC in the JIS system are NPN bipolar transistors. The name contains no further details, so this is probably a datasheet rather than a device schematic. It should list Vcbo, Vceo, Ic, hFE and the case type. When diagnosing a dead stage, technicians rely on such a sheet for pinout during diode-mode testing and for selecting a substitute with matching footprint and ratings at least as high as the original.
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.