Specification sheet for the 1SV284 part in PDF format, 69.8 KB, listed in the schematic category. Given its 1SV designation, the device is a varactor diode, and the document most likely contains ratings, characteristic curves and an outline drawing. Open it in any PDF reader when verifying a component in an oscillator or RF filter, or when looking for a replacement. Check the marking code, package and capacitance at the bias voltage used in your circuit before swapping parts.
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.