Labelled 1n6762, this 17.2 KB PDF appears to be a datasheet page for a JEDEC 1N-numbered device rather than a circuit diagram. No model, brand or variant is given beyond the part number, so the device class and values should be taken from the document itself. Technicians typically consult such pages for maximum voltage and current, characteristic data and the package drawing. They help confirm a part marking, validate a measurement and pick a substitute with matching ratings and footprint for the board.
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.