Cdk6040

My Japanese Fz1 i bought as a replacement only plays Japanese games. Have tried official US games Gex, it sits loading then spits it out same with US copies. The Sampler Disk for the 1st fz1 gives me a message then shows information on the types of media it can support. Music cds work no problem, Japanese games, work tested Road Rash. Is there a mode select that im not aware of? Everyone in the comments say are all region free minus the pal versions. Whats going on here?