38 tests (50 tests when checking the SuperDish box) will happen if it does not detect a DishPro setup but a legacy setup instead or nothing connected. 2 tests will be run (3 tests if SuperDish box is checked) if it detects a DishPro setup.
I just did this today, we had a bad 311, we failed to hook the 3:4 switch to the proper line. It started doing 50 tests. We found the proper line, put it on port 1 of the 3:4 and re-ran the check switch, did not power off or unplug anythin to "clear the matrix". It procceded to to 3 tests. Superdish 105.
Yes, but it didn't do it until you ran the Check Switch. Meanwhile if it had last "seen" a DP setup, it was pumping out high voltage with high current capability, and that's been known to fry a (weak? marginal? worn out?) Legacy LNBF.