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7-3
Section
Maintenance of the NT620S/620C
273
7-3
Maintenance of the NT620S/620C
Carry out maintenance work in order to ensure that the NT620S/620C is always
used in its optimum condition.
WARNING Do not disassemble the unit or touch parts inside while the power in ON.
You could sustain an electric shock.
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Spare PT
It is advisable to have a spare NT620S/620C available to minimize system
downtime in the event of an NT620S/620C failure or if the screen display be-
comes difficult to read due to deterioration of the display unit.
7-3-1 Replacing the Backlight
When the backlight in the display is getting dim and the screen cannot be read
easily, replace the backlight. The backlight can be replaced at the rear of the
NT620C while it is mounted in an operation panel.
Reference
There is no backlight in the NT620S.
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Replaceable backlight model
NT620C-CFL01
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Guide to backlight replacement
Under normal conditions it can be assumed that the backlight will need to re-
placed after about 20,000 hours. However, the life of the backlight does vary in
accordance with 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.
Backlight Replacing Method
Follow the procedure below to replace the backlight.
WARNING Turn the backlight off before replacing it. Otherwise you could sustain an electric
shock.
Operation
1. Turn off the power to the NT620C and remove the lid of the CFL case, located
at the upper right part of the rear of the NT620C: remove the screw with a
Philips head screwdriver, then open the CFL case lid.
Pull the side of the CFL lid that had the screw in it toward you and pull it out at
an angle.
CFL case lid
Screw securing CFL case lid
Summary of Contents for NT620C
Page 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Page 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
Page 3: ...iv...
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