
Fabius
®
Function Description
2-52
Cop
yr
ight
2000 Dr
aeger
M
edical,
In
c.
sec2_
funcde
scr
ip_
b.fm
10.5.1
Microcontroller
The microcontroller 80C517A controls the functions of the Power PCB.
10.5.2
Quartz Oscillator
The quartz oscillator of the Control PCB clocks the microcontroller 80C517A with
12 MHz.
10.5.3
EPROM
The EPROM has a programmable area of 512 kbytes.
10.5.4
Latch
The latch HC373 is a driver block.
10.5.5
MOSFET Amplifier
The MOSFET amplifier controls the motor of the ventilator.
10.5.6
Voltage Transformer for the Backlighting Lamp
The voltage transformer E1241 transforms the input voltage into a corresponding
output voltage for the lamp of the backlighting.
10.5.7
PEEP Valve Control
The power field-effect transistor BUZ20 and the operational amplifier LM324 control
the PEEP valve.
10.5.8
Light Barrier Evaluation of the Motor
The IC 74HC14 evaluates the final position and the movement of the motor
(END-SCH, PHASE0, and PHASE1).
Risk of damage to the voltage transformer.
The voltage transformer will be damaged if used at no load.
Do not
operate the voltage transformer without the lamp of the
backlighting
.
Summary of Contents for Fabius 4116029
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