Brandon7861 when I get home from work I will get the main board number. Nomad, the board is untouched. Ive owned my 2100 for at least a decade or two. I am ordering another TD6102 that the vco feeds. Amazing its still available. Ive noticed other schematics show the TA7310 getting the vco feed, but not the board I have. Thanks for all the help guys.