Omron NT31 Series, Operation Manuals

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632
Maintenance of the NT31/NT31C
Section 11-3
Replacing the Backlight
Use the following procedure to replace the backlight.
Switch OFF the NT31/NT31C power before replacing the back-
light. Otherwise you could sustain an electric shock.
Do not touch the backlight immediately after switching OFF the
power supply.
Otherwise burn injuries may result due to the high tempera-
tures.
Replace the backlight by following the procedure given below:
Procedure 1 Turn the power supply to the NT31/NT31C OFF.
2 Disconnect the terminal block wiring, the communication cable, and the printer
cable. If a memory unit or interface unit is mounted, remove that unit also.
3 Open the cover of the CFL unit housing by following the procedure described
below.
a) Unscrew the screw in the center of the cover.
The screw is designed so that it cannot be removed, but if it does come out
for some reason and falls inside the NT31/NT31C, it must be extricated
without fail.
b) Open the cover while pressing the tabs at its left and right inward.
c) When the cover has opened far enough, remove it.
a
b
b b
WARNING
CAUTION