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Maintenance of the NT631/NT631C Section 7-3
10. Reconnect the wiring, cables, and Units disconnected in 2, and tighten the
screws at a torque of 0.4 N·m.
Turn the power on, and check that the RUN LED is not flashing and that no
buzzer is sounding.
If the RUN LED flashes at 1-s intervals and a buzzer sounds intermittently,
the touch panel cable is disconnected. Follow the above steps from 1, and
check the lock status of the connector.
11. Before starting normal operation, confirm that the following tests can be
executed correctly by using the I/O check in the Maintenance menu. Also
perform a communications test with the host.
• Touch switch
•Backlight
12. On confirming that all the tests in 11 can be executed normally, start oper-
ation.
7-3-1 Replacing the Battery
The NT631/NT631C uses a lithium battery to back up the memory contents.
The battery life is about 5 years if the NT631/NT631C is used in a location
where the ambient temperature is 25
°C. If the temperature at the location of
use is higher than this, the battery life will be shorter. Change the battery at
suitable intervals in accordance with the operating environment of the NT631/
NT631C.
It is advisable to keep a spare battery so that the battery can be replaced
immediately when replacement becomes necessary.
Battery Type
3G2A9-BAT08 (for both NT631 and NT631C)
Guide to Replacement
Replace the Battery in the following cases.
If the power supply to the PT is left turned OFF after a low battery voltage has
been detected, the memory backed up by the battery may be corrupted.
Replace the Battery within 5 minutes of turning OFF the power supply to the
PT.
• When 5 years have passed since the installation of a new battery.
• When the RUN LED is lit in orange (during operation) or in red (when
stopped).
• When the message The voltage is lowered. is displayed on switching on
the power or resetting the NT631/NT631C.
• When The voltage is lowered is displayed in the Battery check in the bat-
tery check menu of the Maintenance mode.
Battery Replacement Method
Replace the battery by following the procedure given below.
To protect the contents of the memory, the battery must be replaced within 5
minutes.
Procedure
1,2,3... 1. Keep the power ON for at least 5 minutes and then turn it OFF.