Icom IC-718 - Page 23

'Initial Set' mode – Tuner type p. 46
One uses the [ Up ] & [ Dwn ] Buttons to navigate to navigate
to Tuner
Rotating the main tuning knob to set '4'.
No: No tuner connected
4: AH-4 tuner connected
8: AT-180 tuner connected
Default is 'No'