The name carries only the part number 2SD1195, so this 148 KB PDF is best treated as the datasheet for that transistor, even though the index labels it a schematic. Under JIS rules, 2SD marks an NPN bipolar transistor designed for low-frequency use. Sheets like this list breakdown voltages, collector current, power dissipation, gain ranks and a dimensioned package drawing. Check the pinout carefully against the board silkscreen before installing a replacement or an alternative type.
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.