Power supply schematic for a chip amplifier, provided as a 497 KB PDF with a source tag in the name. Chip amplifiers using ICs often need an unregulated or regulated split supply with a bridge rectifier and large reservoir capacitors. The name does not specify which IC or voltages are used. Builders and repairers use it to check transformer rating, rectifier and capacitor sizing and grounding, and should confirm the supply voltage stays within the limits of the amplifier chip before powering up.
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.