Component datasheet in PDF form, 87.9 KB, for the 2SC3899. The JIS numbering system uses 2SC for NPN bipolar transistors, which fits a part specification better than a full schematic, though the index labels it as one. The name carries no other information. Repair use includes reading the pinout for correct orientation, comparing measured junction behaviour with expected values and finding a substitute with matching breakdown voltage and current. Verify the package on your board corresponds to 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.