A 52.7 KB PDF for the 2SB1672, which the JIS 2SB prefix identifies as a PNP transistor, so the file is expected to be a component datasheet even though it is catalogued as a schematic. Open it in any PDF reader to read the pin layout, case outline, breakdown voltages, collector current, power rating and hFE classes. Those details let a technician test the part correctly, recognise a failed junction, and source a replacement with compatible polarity, pinout and limits for the circuit.
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.