Sharing its 173 KB size with a neighbouring entry, this PDF is named 2SA1986, the JIS number of a PNP bipolar transistor. It is most likely that part's datasheet, despite the schematic label, and nothing else can be read from the name. During repair it helps identify the leads for junction tests with a multimeter, compare voltage, current and power ratings with the circuit, and check the package drawing so a replacement matches the footprint.
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)