Revision A Transport Pro 2-15
2012659-042
Equipment Overview: Theory of Operation
LCD Backlight Inverter
The LCD backlight inverter is a DC to AC inverter for a dual lamp LCD.
The input voltage is rated at +8 to +18 V DC and the output voltage is
rated at 400 to 600 VRMS. The start voltage is 1400 VRMS and the lamp
current is 7 milliampere per tube.
Alarm Light
The alarm light circuit board provides an alarm light in the monitor’s
bezel. The input voltage is rated +5 V DC. It transmits two control
signals, one for red LEDs and another for yellow LEDs.
Battery Interface
The battery interface circuit board provides power connections for the
two internal batteries for charge/discharge. It also controls battery
status communication with the monitor.
Speaker
The speaker is used for audible notification of alarms. It is 66 mm
square, water-resistant, 3 watt, with a frequency response of 400 to 4500
Hz.
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