Installation and operations manual is on my website for FSG60 (similar to
FSG50 but with memory storage) FSG70 and FSG71 are entirely different
radios, the manual also includes some circuit descriptions and values but
not the entire interior schematics used by avionics technicians.
see http://www.wingsandwheels.com/useful.htm
tim

wrote in message
...
I have a web page with FSG71M info, including pictures of the internals,
describing the problem I had and how I fixed it. Also the FSG71M schematic
is available there for download.
I am not familiar with the FSG50, but maybe you can find similarities
between FSG50 and FSG71M.
https://sites.google.com/site/threeu.../dittel-fsg71m
3U.