Part sheet for the 1SV309 in a 75 KB PDF, indexed as a schematic. Under the JIS naming system 1SV identifies a diode, and Toshiba uses the series for variable-capacitance diodes in RF tuning circuits. The name contains no further details such as package or version. Technicians rely on such a sheet to decode marking codes, confirm cathode orientation and compare capacitance ratios. That matters when hunting a replacement for a failed varactor, so check the part on the board against the sheet first.
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.