This may have been posted before but there's a ton of free manuals on here and it's in several languages, although the manuals aren't. http://www.manualsworld.net/
they claim that over a million manuals are available on their site. I checked for a Sony walkman manual and cannot find any. Apparently they have some newer generation equipment manuals
I grabbed some AIWA Manuals, I didn't go through them all but found a couple I was looking for. Did you see that Brazil Site I posted with all the Sony Manuals? It's been a few months but that guy had a ton of stuff on his.