PDF datasheet for the 2N5401 PNP transistor, 75.2 KB, listed under schematics although it is a component document. No vendor or revision is given in the name. Expect maximum ratings, hFE versus collector current curves, saturation voltages and a package drawing showing emitter, base and collector. These help when diagnosing failed driver stages in power supplies, monitors or audio gear and when picking an equivalent. Check the marking on the board part and confirm the pin order before installing a replacement.
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.