PDF for the 1SV310, filed as a schematic. The name adds V1, probably a document version, and sot323, the miniature SOT-323 three-lead SMD package. The 1SV prefix is a JIS diode designation, used by Toshiba for varactor diodes. The sheet should give the package dimensions, pin layout and capacitance characteristics needed when replacing a tuning diode. With SOT-323 parts, confirm orientation and marking code under a microscope before soldering, as the pads are very small.
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.