Two part numbers appear in the name, 1N914 and 1N916, so this 78.8 KB PDF is a shared datasheet for two related JEDEC 1N diodes rather than a board schematic. Combined sheets usually tabulate the small differences between the types. Repair technicians consult such documents to confirm polarity banding, forward voltage and reverse ratings when testing or replacing small signal parts. It opens in any standard PDF reader; compare the code printed on the glass or plastic body with the one in the table 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.