Indexed as a schematic, this 63.9 KB PDF carries the name 1SV265 and nothing else. Under Japanese 1S numbering, the 1SV prefix denotes a Toshiba variable-capacitance diode, so treat the document as a component data sheet. It typically lists absolute maximum ratings, capacitance at several bias voltages and the package dimensions with pin identification. That information helps when replacing a damaged varactor in a radio, TV tuner or PLL circuit and you need to match the curve. Any PDF reader can open it.
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.