JLG 400S Service And Maintenance Manual page 447

5. When the sensor is calibrated in that position, the screen
will read:
6. Swing the machine 180 degrees, making sure the boom
is centered and in the transport position, and ENTER
. The screen will read:
3121671
SECTION 6 - JLG CONTROL SYSTEM
7. When the calibration is complete the screen will read as
shown below. Return the machine to the travel position.
6-7