Datasheet in PDF form for the KA78XX series, the family of fixed positive linear voltage regulators following the classic 78xx numbering, where the last digits indicate output voltage. The 231 KB document should cover pinout, package outlines, input-output differential, maximum current and typical application circuits with input and output capacitors. On a repair bench it helps verify that a regulator delivers its rated output, check dropout and thermal limits, and choose a compatible replacement. Check the exact suffix and package on the part before substituting.
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.