Dräger Medical Babytherm 8004, Technical Documentation Manual

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Function Description Babytherm 8004/8010
2.3.1 WT LED 8010 PCB The WT LED 8010 PCB carries the 7-segment displays for the measured
skin temperature and the foot symbol LED.
2.3.2 Membrane keypad 8010 The membrane keypad 8010 has a key matrix, keys and LEDs.
2.3.3 Text display (LC display) The text display shows plain text messages (advisory messages, warnings,
alarms, and prompts).
2.3.4 Loudspeaker In the event of alarms or messages, the loudspeaker issues an audible alarm
signal. A volume control and a soundchip control the loudspeaker.
2.3.5 WT Front PCB A port module read the key matrix. LED control is carried out by means of
decoders, shift registers, and multiplex signals.
The WT Front PCB carries the following subassemblies:
– Address decoding and chip select
– Soundchip with volume setting
– Text display contrast setting
– Text display latch control
– Voltage supply to text display backlight
– Nurse call
– Interface modules
– Level converter
– Optocoupler
– Display module
– LED matrix control