No ability to add converter box

Hello folks,



I have a Series 2 Tivo with a Sansonic converter box that works fine. I also have a "backup" Tivo Series 2 (from craigslist) that won't allow me to add the Sansonic converter box. When I go to the channels menu it only asks if I am using the same "Cable" box not "Converter" box. My other Series 2 asks for "Converter" box. Is there a secret place within the menu system to change from "Cable" to "Converter"? Please help.



Thanks a lot.