Reference PDF for the 1SV285, about 70.4 KB, catalogued as a schematic. The 1SV prefix marks a variable-capacitance diode, so this should be a manufacturer data sheet. Technicians use these documents to identify small SMD diodes by marking, to read the capacitance curve when diagnosing a tuner that will not lock, and to choose an equivalent part. Make sure package type and polarity marking agree with the device on the board, since a reversed varactor will not tune.
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.