Filed as a schematic, this 65.8 KB PDF takes its name from the 1SV246 part number and carries no other details. The number follows Toshiba's 1SV series of variable-capacitance diodes, so the content is most likely a manufacturer data sheet. Expect tables of maximum reverse voltage and capacitance at set bias points, plus a dimensioned package drawing with pin numbers. Those details help when repairing tuner or VCO circuits and checking whether a replacement will behave the same. It opens in a normal PDF reader.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.