Component sheet for the 2SA1940 transistor, provided as a 172 KB PDF and listed among schematics. The name offers only the part code; the 2SA prefix is the Japanese JIS marker for PNP bipolar transistors, so this reads as a datasheet. Expect ratings tables, characteristic graphs, pin layout and package outline. It is useful when servicing amplifier or power sections, letting you confirm lead order, compare complementary pairing data and check that any replacement meets the original voltage and current ratings.
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.