PDF of 129 KB for the 2SD1427, an NPN bipolar transistor in the 2SD series, indexed as a schematic but most likely a datasheet. The name gives no ratings or package. These sheets list maximum collector voltage and current, gain and switching times, and are used when a technician must confirm pinout, test the removed transistor and select a replacement with matching characteristics, especially in high-voltage output stages where an underrated substitute fails quickly.
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.