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Block Diagram Theory
AC Input
N-550B
Figure 48: Block Diagram
The N-550B functional block diagram is shown in Figure 48. Most of the
functions of the N-550B are performed on the Main PCB. Functions on the
Main PCB include the SpO
components of the N-550B are the Power Supply, the Front Panel PCB.
Contained on the Front Panel are annunciators and push buttons, allowing the
user to access information and to select various available parameters. The
Front Panel PCB contains SpO2, heart rate, and Pulse Amplitude indicator
LEDs and SatSeconds Display LEDs. Their associated driver circuits are
included in the Main PCB.
The N-550B allows the user to connect the N-550B to AC power ranging
from 100 volts AC to 240 volts AC.
AC power enters directly the N-550B's Power Supply. A 2-amp fuse protects
both the "Line" and "Neutral" lines. These user-non accessible fuses are
located in a fuse drawer, which is part of the Power Supply located in the
N-550B.
module, MCU, and Memory. Other key
2
Technical Discussion
111
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