Datasheet for the 1N746A, the first part of the JEDEC 1N746A to 1N759A zener series, supplied as a 50.3 KB PDF and labelled as a schematic in this catalogue. It provides zener voltage at test current, dynamic impedance, reverse leakage, power rating and package dimensions. A technician uses it to confirm what voltage a zener should hold in a regulator or protection stage and to compare a measured value. Check the suffix letter for tolerance and orient the cathode band correctly when fitting a substitute.
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.