6141.22X Incubator 8000 IC/SC/NC
Function Description
09.99 Page 45 of 49
g. indication air heatinq
The indication of the air heating connection state is done from the supply voltage side through
a converter on the PCB Unit. With this sinusoidal signal a mono flop connection is re-triggered
and the output signal of PA7 of PIA D2 is evaluated.
h. Mono flop for INOP-LED
Via another monoflop (D6B) the INOP-LED is driven. The time constant is 100 ms. The mono
is re-triggered via address 8050h.
i. triggering of additional fan
A mono-flop is installed on the printed circuit board, which is triggered by the indication
impulses generated by the air heating via the current transformer. Via this mono-flop a fan is
driven as soon as the air heating becomes inactive. The time constant for the mono flop is
1.36 s.
3.2.9 Switch PCB
The standby-switch with three independent switching contacts is installed on the Switch PCB.
Switching contact S1.1 closes mains relay K1 on the Unit PCB. By means of switching
contacts S1.2 and S1.3 the horn and the mains failure LED - supplied by the storage battery
on the Power Pack PCB - are triggered in the event of power failure.
3.2.10 +5 V voltage regulator
The AC voltage of the transformer of the unit is rectified on the Power Pack PCB and is
stabilized with the 5 V voltage regulator on the right side panel of the electronic module.
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