Sony DVS-9000SF User Manual page 288

To give audible feedback from menu touch screen operations: Press
Calibrating the touch panel
Use the following procedure.
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Setup Relating to Operations From the Control Panel
[Touch Beep], turning it on.
In the Panel>Maintenance menu, press [Touch Panel Calibration].
The following message appears.
"To Perform Calibration, please touch the center of each plus sign."
Press [OK].
Press the center of the plus sign displayed on the screen.
When you press on the plus sign, it disappears and a diagonally opposite
plus sign appears.
Press the center of the plus sign.
A confirmation message appears.
• Select "Yes" to restart the panel reflecting the new setting.
• Select "No" to cancel the setting and return to the Maintenance menu.