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3.3
Backlight timer function
Activating the backlight timer
1070 073 826-101 (01.10) GB
The fluorescent backlight tube provides the background lighting for the TFT
display. After approx. 40,000 operating hours, the tube will produce only
50% of its original brightness since it has a limited service life. Refer to Sec-
tion 7.2 for information about replacing the backlight unit.
To extend the service life of both display and backlight tube, the flat screen
display features a timer ("sleep") function for the backlight. This circuit dar-
kens the display if the control panel is not operated for a preset period of
time.
The backlight timer is activated on the IPC 300:
In the BIOS setup, select the menu option:
L
D IPC300:
POWER " LCD Backlight Off Timer
Then set the timer to an interval between 28 seconds and 14 minutes.
To ensure that the screen contents no longer change, go to the operating sy-
L
stem, and select a screen saver which will darken the display (Blank Screen,
i.e., no objects on the screen).
Select a wait time for the screen saver that is shorter than the interval time of
the backlight timer.
Any keyboard input, mouse movement or contact with the touch screen will
again activate the backlight, and the display will again appear.
Display and operating elements
3–3
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