Schematic in PDF format for the Ahuja DXA 1802, about 1.63 MB, belonging to the Ahuja range of public address amplifiers. Repair technicians use such drawings to trace signal flow from the inputs to the output stage, check supply rails, identify transistor and IC types and work out bias or protection faults. It opens in any PDF reader. Another copy named DXA-1802 of identical size probably holds the same content. Compare the board version inside the unit with the drawing before replacing parts.
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 @pdf_servicemanual. 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.