Compact 102 KB PDF for the 2SC3090 transistor, indexed under schematics. The name carries no detail beyond the part code. Under JIS numbering, 2SC indicates an NPN bipolar transistor rated for high-frequency work. A bench technician opens a sheet like this in any PDF viewer to check the pin arrangement, package drawing and absolute maximum ratings. Those values matter when judging a substitute or checking a part removed from a board, so confirm the case marking first because suffix letters can change the gain grade.
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.