Dräger Medical Babytherm 8004, Technical Documentation Manual

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Function Description Babytherm 8004/8010
1.3.4 Loudspeaker In the event of alarms or messages, the loudspeaker issues an audible alarm
signal. A volume control and a soundchip control the loudspeaker.
1.3.5 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