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7-3SectionMaintenance of the NT31/NT31C
242
Replaceable Backlight Model
NT31C-CFL01 (for both NT31 and NT31C)
Guide to Backlight Replacement
Under normal conditions it can be assumed that the backlight will need to be re-
placed after about 25,000 hours when used at medium brightness (the figure is
about 10,000 hours when used at the high brightness setting). However, the life
of the backlight does vary, particularly in accordance with the temperature in the
environment in which it is used, and it should be replaced when it is getting dim
and the screen is getting hard to read.
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 NT31/NT31C 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.
Use the following procedure to replace the backlight.
WARNING
Switch OFF the NT31/NT31C power before replacing the back-
light. Otherwise you could sustain an electric shock.
CAUTION
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, 2, 3... 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 de-
scribed 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 extri-
cated without fail.
b) Open the cover while pressing the tabs at its left and right inward.
Notes on Replacing the
Backlight
Replacing the Backlight