Covidien Newport e360, Service Manual

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Theory of Operations
A-14 Service Manual
A.6.3
Electronics
Power to the ventilator enters the AC inlet, which connects to the power supply. The power supply
converts alternating current to direct current, and accepts any voltage or frequency within the
specified range.
Direct current from the power supply enters the DC-DC PCB, which supplies operating voltage to
other PCBs, includes circuitry for external battery connection and battery operation, and powers the
fan, and heater.
The main PCB accepts input from the oxygen sensor and PSOL valves, acts as “motherboard” for the
ventilator including the secondary (backup) alarm. The main PCB powers and receives signals from
the analog PCB.
The analog PCB accepts signals from the flow sensors and includes all ventilator transducers. The
solenoid PCB includes all valve controls (solenoids) except for the exhalation valve solenoid
attached to the jet pump.
The single-board computer board includes all of the video interface, USB, RS232, primary audio
alarm, and touch screen interfaces.
The display PCB controls the membrane buttons, LEDs, and the optical encoder. It also
communicates with the monitor CPU on the main PCB.
The power sequence PCB provides power-on reset to the single-board computer when a power-on
failure is detected. The power sequence PCB also provides over-current protection to the internal
battery, as well as power-off delay to ensure data is saved before the ventilator shuts down.