Copper-side PCB artwork for the Apex AX 20 amplifier project, a 208 KB PDF showing the track pattern rather than a circuit diagram. DIY builders print it to make the board by toner transfer or photo exposure. Repairers can also use it to follow traces and spot broken or burnt tracks. Check the print scale against a known component footprint before etching, and compare with the mirrored and component-placement sheets of the same design.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)