A 106 KB PDF for the 2SC3143, which the JIS 2SC designation marks as an NPN bipolar transistor. Listed in the schematic section, the single part number in the name points to a data sheet rather than a board diagram. Look for the C3143 marking on the device itself. No package, hFE rank or maker is stated in the name. The sheet helps with pin identification before testing, checking ratings against the circuit, and confirming lead spacing so a replacement drops into the existing footprint correctly.
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.