Document for the 2SD2536 transistor, a 71.6 KB PDF in the schematic category that is most likely its datasheet. The 2SD prefix identifies an NPN bipolar device under the JIS scheme, typically used in low-frequency switching or amplifier stages. Technicians consult it to identify the terminals, check absolute maximum ratings and compare characteristics with possible substitutes. The package shown in the sheet should be compared with the footprint on the board before ordering parts.
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.