Front Controller Pcb (Babylog 8000/Babylog 8000 Sc With Lc Display) - Dräger Babylog 8000 Technical & Service Manual

Function description
10.8 Front Controller PCB
(Babylog 8000/Babylog 8000 SC with LC Display)
The Front Controller PCB reads in the keys of the potentiometer and display field, controls the LEDs of
the potentiometer and display field, powers the LC display with operating voltage (contrast), controls the
LC display backlight, and generates the control signal for the bargraph.
D
key port
Control bus
and
Adress bus
Data bus
LED driver
Amplifier
Bargraph
U
B
U
A
Fig. 22: Block diagram of the Front Controller PCB (Babylog 8000/8000 SC with LC display)
46
Dräger Medical AG & Co. KGaA
Contrast adjustment of LC display
A
DC
AC
Ref
D
6x
Adress
decoder
voltage for
display illumination
Keys of the front panel and options switches
LEDs of the front panel
Alarm LEDs
Bargraph of the front panel
Potentiometer of the front panel
6173.3
Babylog 8000
LC display