The 2SA1298 is covered by this 203 KB PDF, catalogued as a schematic but named only after the component. Under JIS conventions the 2SA prefix identifies a PNP transistor, so treat the document as a part datasheet. Typical contents include package outline, pin assignment, ratings tables and hFE classification. When replacing a failed device, use it to verify orientation on the PCB footprint, confirm the gain rank marked on the body, and make sure any substitute equals or exceeds the original voltage and current limits.
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.