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Chapter 6 Maintenance
6-11
6.4.2 PL-3700∗ Series
PL units use a long-life type backlight. The actual life of the backlight however, will vary depending on the
PL’ s operating conditions. It is recommended that it be replaced periodically. The service life (half brightness
life) of the backlight when it is lit continuously at room temperature is as described below.
50,000 hours --- approx. 5.7 years (ambient temperature: 25°C, when lit continuously)
• The backlights of the following PL cannot be replaced by the user. When the backlight
needs to be replaced, please contact your local distributor.
• PL units which need to be compliant with ANSI/ISA standards.
• PL units whose Revision "5" is marked on the label of the front module.
• When the LED setting is spe cified with t he RAS control in Control Panel and a backlight
burnout is detected, the status LED blinks in orange/red.
• If the backlight or the display unit is damaged, the screen display will go out. Even if the
screen goes out, however, there is a possibility that the touch panel is st ill operating cor-
rectly. Therefore, since any type of touch panel contact could have an unexpected or dan-
gerous effect or result, be sure not to touch the screen when this condition occurs.
• A backlight burnout is detected by monitoring the consumed current. Depending on the
condition of the backlight, a backlight burnout may not be detected or it may be detected
before the backlight burns out completely.
[Electric shock]
• Whenever changing th e backlight, be sure the PL’s power cord has been disconnected
and that the unit is cooled down.
• When the PL ’ s power cord is connected and the PL is ON, high voltage runs through the
wires in the backlight area, do not touch them!
[Burn]
• When the PL’s power has just been turned OFF, the backlight area is still very hot! Be
sure to wear gloves to prevent being burned.
[Glass]
• The backlight is very fragile. Do not touch the glass tube directly or try to remove its
power cord, if the glass tube breaks you may be injured.