Reference sheet for the 2sb1561, a PNP bipolar transistor according to the JIS 2SB prefix, provided as a 38.7 KB PDF. The name gives no manufacturer, package or version details. Repair technicians use such datasheets to find which pin is base, collector and emitter, check maximum collector-emitter voltage and current, and look up hFE grades and the body marking. Compare the code on the suspect component to the one in the sheet, then match polarity and package when choosing a replacement part.
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.