My 1197 lost both DI and SI functionality one day on the lake recently. It still had 2D and gps/mapping functionality though. I swapped out the 1197 with my 1198 to verify that it wasn't the transducer. Humminbird has a $487.50 flat rate for repairs, but I can't see the value of putting that money into a really old unit.
Is there anything I can check by opening up the unit to possibly remedy the situation? Is it possible that connections could be loose? I have had this unit since Feb of 09.