Omron Programmable Terminals NT631 Setup Manual page 257

Maintenance of the NT631/NT631C
240
6. Fit new backlights.
The backlight for the top is different from that for the bottom.
Fit projections and dents of the backlight with those on the fixture, and shift
the backlight to the left. Check that the backlight is in contact with the left
end of the fixture and the cable comes out from the notch without being
trapped.
When the backlight is correctly fit, tighten the screws at a torque of
0.1 N·m.
Top part
Fixture
Cable
Bottom part
Cable
Fixture
7. Engage backlight connectors at the top and the bottom respectively in
place. The backlight cable has a polarity; refer to the figure below.
White
Red
8. Fit two touch panel cables at the top. Be sure to lock the connectors as in
step 4 after fitting.
9. Close the rear case, and tighten four screws. Make sure that the internal
cable is not trapped.
Backlight fixture on the PT
Backlight
Backlight fixture on the PT
Backlight
Red
White
Section 7-3
Mounting screw
Backlight
Mounting screw
Backlight