Futaba 8FGAS, 8FGHS 2.4GHz - Manual (Page 51)

51 <Functions of System Menu>
Stick calibration method
*J3 and J4 correction is described below. J3 and J4 correction
is performed using the same procedure.
1.Select [CALIBRATION] and access the setup
screen shown below by touching the RTN
button.
2.Move the cursor to the J3-J4 button and
touch the RTN button.
3.Move the J3 or J4 sticks to the neutral position
and press the RTN button for one second.
4.Set the J3 and J4 sticks fully to the bottom
right and wait until the buzzer sounds.
5.Set the J3 and J4 sticks fully to the top left and
wait until the buzzer sounds.
6.The above completes the correction
operation. Operate and check if stick
correction was performed normally.