PDF document for the 1SV304 semiconductor part, filed under schematics in the index at 71.0 KB. The 1SV prefix follows Japanese diode numbering, and parts in this range are generally variable-capacitance (varactor) diodes, so the content is most likely a component datasheet rather than a board diagram. Technicians use such sheets to confirm capacitance versus reverse voltage, package outline and marking code before fitting a replacement in a tuner, VCO or RF front end. Check the marking on the part on your board 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.