Document for the 2SB1290 in PDF form, 57.9 KB, with a _1-2 suffix that possibly indicates a section or revision; the name does not say. Though categorised as a schematic, it concerns a discrete transistor. The JIS 2SB prefix denotes a PNP device for low-frequency service. Open it in a PDF viewer to look up the pinout, package outline and absolute maximum ratings, and confirm the marking on the failed part matches before choosing a replacement.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)