Component reference for the 2SB1386, a 155 KB PDF that likely holds full electrical tables, though the name states nothing beyond the part number. Japanese JIS designation 2SB means a PNP transistor for low-frequency use. Repair technicians use such datasheets to verify pinout and package before desoldering, to read breakdown voltages and collector current limits, and to choose a safe equivalent when the exact part cannot be sourced. Look for B1386 on the case, since the 2S prefix is usually dropped.
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.