Data document for the 1SV302 diode, stored as a 72.1 KB PDF and catalogued as a schematic. Parts carrying the 1SV prefix are typically variable-capacitance diodes used in RF tuning, oscillators and filters, so this is probably a single-part datasheet. Use it to look up the capacitance ratio, series resistance, maximum reverse voltage and pinout, and to compare the marking code with the device on the PCB. Any replacement should share the same package and capacitance curve, otherwise tuning range will shift.
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.