Named for the 2SB1214 transistor, this 71.3 KB PDF is catalogued as a schematic but is expected to be the part's datasheet. Within the JIS scheme, 2SB denotes a PNP transistor designed for low-frequency use such as power switching and amplification. Repair use centres on reading the pin assignment, package dimensions, collector current and breakdown limits, and on checking that any equivalent part meets them. Open it with a standard PDF reader and compare the device marking on the PCB first.
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.