Sams are difficult to scan. I've never tried doing it in PDF, I'm assuming you need the Adobe program to do that. I think I might have it somewarez but I'll have to look.
They can also be done in plain old .jpg like this one I have on my site:
http://www.vintagetvsets.com/schem/ts4j1.jpg
This is only one half of the basic schematic and it takes up 275K