Service schematic for the Audio Pro A2, supplied as a 542 KB PDF; the int-sm suffix most likely marks an international service manual edition. Use it to follow the signal path from the inputs through the amplifier stages to the speaker drivers and to check the power supply section. The drawings help locate components, read part values and compare voltages measured on a faulty unit. Before relying on the diagrams, confirm that the model and any board revision printed on your unit match the documentation.
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.