Sliders
First step of this test is Joystick calibration.
Follow display's instruction for joystick calibration procedure.
Move Joystick to the left then leave it for the centre
Center Pos. frame will light on, press the frame to store left and central joystick position.
Repeat this procedure for each side (right/centre, top/centre, bottom/centre) then store by
pressing marked save button (marked only after bottom/centre joystick calibration).