Device Description MV4-670-TA1/2, MV4-690-TA1/2 3-26
Moeller 07/01 AWB-C2700-1347GB
18 Display Technology, Backlight
The MV4-600 features an active matrix color LCD. On an LCD screen, the individual pixels are not lit. The
image is produced by means of a backlight that varies in color and intensity on account of the individual LCD
cells (pixels).
The light of the backlight is produced by means of cold cathode tubes. The lifespan of these tubes
(→ Section 21) is limited, and depends on the relevant operating conditions. The intensity of the brightness
and the number of start cycles are major factors for the lifespan of the tubes. Reducing the brightness can
considerably increase the lifespan of the device. Frequent switching, particularly at low temperatures, will
reduce the lifespan of the unit.
Therefore avoid the frequent switching on and off of the backlight or the entire system. Minimising the
brightness required is more effective than reducing the frequent on/off switching.
Further information on the brightness setting of the backlight is provided in the documentation of the
GALILEO configuration software.
19 Maintenance and Repair
The MV4 is maintenance free. For trouble-free operation of the IR touch screen, clean the inner section of the
device front (front glass and IR frame) regularly (→ Section 17.3).
Repairs to the MV4 should only be carried out by the manufacturer.
20 Disposal
MV4 that are no longer used, must be properly disposed of or returned to the manufacturer.
Special note:
- The clock module contains a sealed lithium battery.
(real time clock, Dallas DS12887 or STMicroelectronics M48T86PC1)
- >LCD units are fitted with fluorescent tubes for the backlight. These contain mercury.
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