Omron Programmable Terminals NT631C - Manual (Page 255)

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Maintenance of the NT631/NT631C Section 7-3
7. Engage backlight connectors at the top and the bottom respectively in
place. The backlight cable has a polarity; refer to the figure below.
8. Fit the touch panel cable. Be sure to lock the connector as in step 4 after
fitting.
9. Close the rear case, and tighten four screws. Make sure that the internal
cable is not trapped.
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.