Part documentation for the 1SV331 in PDF format, about 71 KB and indexed as a schematic. The 1SV prefix is a JIS diode designation used by Toshiba for varactor diodes, the voltage-tuned capacitors found in RF front ends and VCOs. No package or revision appears in the name. Typical uses are checking the marking code on a board, confirming which pin is cathode and comparing capacitance at given reverse voltages. Do this against a replacement candidate before soldering it in.
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.