At 320 KB, the largest document in this group, this PDF is for the 2SC3862 transistor. The 2SC prefix follows the JIS scheme for NPN bipolar devices, so the content is most probably a datasheet, perhaps with fuller characteristic curves; the name itself states only the part number. Use the pinout, absolute maximums and outline drawing to diagnose a failed part, orient a replacement correctly and assess substitutes. Check that the package and marking on the board agree with the documented device.
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.