Siemens SINUMERIK 840D sl Operating Manual page 757

Procedure
Turning
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
1. Press the back key and the <MENU SELECT> key at the same time to
start the TCU service screen.
2. Touch the "Calibrate TouchPanel" button.
The calibration process will be started.
3. Follow the instructions on the screen and touch the three calibration
points one after the other.
The calibration process has terminated.
4. Touch the horizontal softkey "1" or the key with the number "1" to close
the TCU service screen.
19.5 Calibrating the touch panel
HT 8
757