Reference sheet for the 2SD1313 transistor, stored as a 206 KB PDF and filed under schematics. The name gives only the part number, and 2SD is the JIS prefix for NPN transistors aimed at low-frequency circuits. Expect collector-emitter and collector-base voltage limits, maximum collector current, dissipation, gain classification and a package drawing. A repair technician uses these figures to test the device with a meter, recognise its marking on a board and choose an equivalent with ratings at least as high.
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.