2.5
PRINTED CIRCUIT BOARDS
The
NEWPORT
BREEZE
has three printed circuit boards which
control and display its functions:
These are:
(1) The power board (PCB
420A).
(2) The main (CPU) board (PCB 410A).
(3)
The display board (PCB 400A).
The power board is located on the back panel. It receives AC input
power from the transformer and it rectifies the AC to DC and then
regulates the DC output voltage to the battery, hourmeter and the
main (CPU) board.
The CPU board is located in the top portion of the unit and contains
the electronic circuitry that controls and monitors the operation of the
unit.
The display board is located behind the front panel and consists of
LEDs which display the various settings and alarms as determined by
the CPU board.
2.6
MANOMETER ASSEMBLY
The manometer assembly (Part No. MAN120A, Figure 2.2) consists of
the manometer and the trigger level mechanism. The manometer has
a pressure range of -1 0 to 120
cmH20. The trigger level mechanism
consists of a photocell (for sensing patient inspiratory effort) and a
gear and shaft assembly for trigger level setting. The photocell is
attached onto the trigger level indicator such that the needle passes
through the photocell and cuts it's photo beam each time the
instantaneous inspiratory pressure equals the trigger level setting.
This cutting of the photo beam is sensed by the electronic circuitry
2nd is used as a means of sensing patient effort.
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