Omron Programmable Terminals NT631C - Manual (Page 253)

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Maintenance of the NT631/NT631C Section 7-3
The life of the backlight varies, particularly in accordance with the temperature
in the environment in which it is used. It should be replaced when it becomes
dim and the screen becomes hard to read.
The life expectancy of the backlight for the NT631C-ST152 @-EV2/ST153@-
EV3 at high brightness is 50,000 hours. The backlight cannot be replaced by
the user, however. Contact your OMRON service center when the backlight
needs to be replaced.
Notes on Replacing the
Backlight Pay attention to the following points when replacing the backlight.
• Carry out the replacement work in a location where there is no danger
that dust or foreign bodies will enter the Unit, and where no water will drip
onto it.
Do not touch the printed circuit boards of the NT631C-ST141 @-EV2/
ST151 @-EV2 with your bare hands.
Also, discharge the static electricity from your body before starting the
work.
• Do not carry the Backlight Unit by holding only its cable, or pull on the
cable. Do not subject the backlight to excessive force or shock.
• Do not disassemble the product to repair or modify it.
Replacing the Backlight Use the following procedure to replace the backlight.
Replace the backlight by following the procedure given below:
NT631C-CFL01 (for NT631C-ST151 @-EV2)
Procedure
1,2,3... 1. Turn the power supply to the PT OFF.
Be sure to do so to avoid an electric shock.
2. Disconnect the terminal block wiring, the communications cable, and the
printer cable. If a Memory Unit or Interface Unit is mounted, remove that
Unit also.
3. Loosen four screws at corners on the rear face of the NT631C, and remove
the rear case.
Be careful not to lose these screws.
From this step on, exert added care not to touch any electronic parts or
printed circuit boards inside the Unit. Otherwise the PT may sustain static
damage.
4. Disengage two backlight connectors at the top and the bottom, and pull out
the touch panel cable.
WARNING
Switch OFF the NT631C-ST141 @-EV2/ST151@-EV2 power
before replacing the backlight. Otherwise you could sustain
an electric shock.