Reference PDF for the 2SC3648 transistor, 120 KB. Under JIS naming, devices starting with 2SC are NPN bipolar transistors. Nothing beyond the part number appears in the name, so this is best treated as a datasheet even though it sits in the schematic category. Look for breakdown voltages, collector current, gain and the pin diagram. Use the data to test the part in diode mode correctly and to vet equivalents, and check the marking on the actual component first.
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.