Labelled 2sb1197k, this 76.0 KB PDF refers to a JIS-registered transistor whose number includes a K suffix; although filed under schematics it should be the datasheet. Under JIS, 2SB identifies PNP transistors for low-frequency service. The document supports repair by giving pin assignment, package dimensions and maximum voltage, current and power ratings for choosing a correct replacement. Since variant letters can change package or ratings, compare the marking on the board with the K designation 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.