I had this issue once and it turned out to be dip switches in the simms. Sometimes in shipping the get jostled and the dip switches are moved. These are the correct positions for dip switches.
CGF does not have switches
SNDF should have all switches OFF
PXLF3 should have 1,2,3 ON and 4 OFF
PXLF4 should have 1 and 4 OFF, 2 and 3 ON
PXLF5 should have and 1 and 3 ON, 2 and 4 OFF
Note that no tall 3902 software has the 5 simms, so check whatever Simms your set has and verify the little switches. Sometimes the switches have moved a bit, so make sure they are all the way in either the ON or OFF position.