Datex-Ohmeda Aestiva 7900 SmartVent Technical Reference Manual page 21

100-120 VAC
220-240 VAC
50/60 Hz
AC Inlet Module
-Fuses
-Voltage Selector
-Filter
Battery
Connector Board
Front Panel
Assembly
Figure 2-3 • Aestiva 7900 Ventilator functional block diagram (Integrated CPU)
1006-0453-000 05/04
In current Aestiva machines, the regulated power supplies and the CPU are
included on a single board (Integrated CPU Board), as shown in Figure 2-3.
A universal power supply is used to convert AC to DC that feeds into the power
supply circuits of the integrated CPU board. The universal power supply
eliminates the need for the toroidal transformer.
Task Light
Power Circuits
Integrated
CPU Board
Proprietary RS232C
Primary RS232C On/StandBy
Digital Circuits
Vent On/StandBy Switch
O2 Supply Switch and O2 Flush Switch
Connector Board
Pneumatic
Engine
2 Theory of Operation
Tec6 Outlet
Universal
Power Supply
BCID
Sensor
Patient Interface Harness
Interface Board
ACGO
Oxygen Sensor
2-5