Audio Pro A101 service documentation in PDF form, about 3 MB, with the int-sm tag pointing to an international service manual version. A document of this size usually holds circuit diagrams together with board layouts and parts information. Technicians use it to trace supply rails, find the amplifier and control circuitry, and identify replacement parts. Check that the model label and any PCB markings on the unit match before replacing components based on these pages.
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.