Sony SA-WGT5D schematic in PDF format, 15.9 MB in size. The name gives only the model, which follows Sony's SA- prefix for speakers and subwoofer units, so open the document to confirm its exact coverage. A service schematic like this helps a technician trace the power supply and amplifier stages, check voltages at marked points and identify failed parts. Any PDF viewer will open it, and the parts list and board layout pages, if present, assist in locating components.
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 @datasheets1. 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.