For the 2SC4006 there is this 79.6 KB PDF, filed as a schematic though a bare JIS code like this normally names a datasheet. The 2SC prefix designates an NPN bipolar transistor; the name gives no maker, package or specifications. Open it in a PDF viewer to look up the pinout and electrical limits. That helps when a transistor near a burnt area needs testing, or when sourcing an equivalent for a part no longer available. Match the printed number on the component before using the data.
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.