Service manual in PDF form for the Panasonic VW-AM10, as indicated by the sm suffix in the name. At 6.88 MB it most likely combines schematic diagrams with board layouts, disassembly steps and parts information, although the name itself lists no revision or board number. A technician uses such a manual to trace power and signal paths, find test points and identify replacement parts. Any PDF reader opens it, and the model label on the unit should be compared with the manual before relying on its values or part numbers.
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.