Audio Pro Ace Bass A101 service manual, with the int tag suggesting an integrated amplifier, though the name does not state this firmly. The 3.01 MB PDF likely includes schematics, board layouts and part listings. Technicians can use it to trace preamp and power stages, check supply rails, locate relays and protection parts, and follow the ACE-Bass related circuitry. Before replacing components, confirm the PCB revision printed on the board matches the manual, and check output-stage bias settings after any power transistor work.
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.