I don't think that anyone would give you a paper schematic. Anyone with a legal copy on electronic media could not make you a copy legally. I think the only way you will get one would be to contact the manufacturer. It will be expensive.
A conversion from NTSC to PAL is not a simple matter. It most likely it is not going to be practical. It is not just the tuner that is different.
The information on Computing.Net is the opinions of its users. Such
opinions may not be accurate and they are to be used at your own risk.
Computing.Net cannot verify the validity of the statements made on this
site. Computing.Net and Compnet Ventures, LLC hereby disclaim all responsibility
and liability for the content of Computing.Net and its accuracy.