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Locomotive Cab Display Module (LCDM)
Maintenance Manual
Doc. No. IP-235
03
4.3
Electronic Components
4.3.1
Power Supply
The power unit can be adapted to the desired battery voltage with the aid of different DC/DC
converters.
Currently 74 VDC (782340) and 110 VDC (782342) applications are supported.
The device is protected against reverse polarity by the corresponding safety elements as well
as mechanically by a keyed connector.
The device does not have any externally accessible fuses. The device must be replaced if
faulty (see Section 8.4 "Corrective Maintenance" ).
The power consumption of the LCDM is typically 20 W (without heating), maximally 30 W.
4.3.2
TFT Display
The device has a 10.4" TFT display.
The display can portray 640 x 480 pixel with a color depth of 18 bit (262,144 colors) and a
viewing angle of ±60° horizontal and -55° ...+45° vertical to surface normal.
4.3.3
Background Lighting (Display)
Two CCFL tubes are used for the background lighting of the display. The brightness of the
CCFL tubes is controlled by an environment controller. The controller can switch the back-
ground lighting on and off as well as adapt the brightness automatically to the ambient
brightness and simultaneously superpose a manually set brightness value.
The keyboard is illuminated by LEDs.
4.3.4
Optical Sensor
An optical sensor in the front measures the ambient brightness and can adjust the display
background lighting as necessary.
4.3.5
Heating
For heating the device at low ambient temperatures, heaters are located directly on the main
board. When the PC-part is switched on, only one heater can be activated. The heater is
activated automatically by an environment controller.
