PDF of 61.5 KB for the 2SA1870, with a 1-2 tag in the name. That tag may indicate one part of a split document or a revision, but the name does not say which. The 2SA prefix marks a JIS PNP bipolar transistor, so the contents are most likely datasheet pages rather than a schematic. Use it to confirm pinout, package and electrical limits when diagnosing or replacing the part, and compare it with the other 2SA1870 file in the index in case pages are missing.
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)