Omron NT631 Operation Manuals page 237

System Maintenance
Reference
Checking the Battery Voltage
To end the check, press the touch switch at the top right corner (NT631: displayed
in reverse video; NT631C: displayed in yellow). The NT631/NT631C will return to
the "DEVICE CHECK MENU".
- The functions of touch switches pressed during the I/O check are not notified to
the host.
- The check cannot be performed until the touch switch at the top right corner is
displayed in reverse video (for NT631) or displayed in yellow (NT631C). Start
the check after the status of the touch switch at the top right corner has changed.
Check the voltage of the NT631/NT631C's built-in battery by following the menu
operation from the System Menu shown below.
Select "Touch Switch".
Press the touch switches displayed on the
screen. A touch switch is normal if it is dis-
played in reverse video while pressed.
Select "Maintenance Mode".
Section 6-11
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