Covidien Nellcor OxiMax N-560, Service Manual

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Technical Discussion
112
Block Diagram Theory
Figure 48: Block Diagram
The N-560 functional block diagram is shown in Figure 48. Most of the
functions of the N-560 are performed on the Main PCB. Functions on the
Main PCB include the SpO
2
module, MCU, and Memory. Other key
components of the N-560 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.
AC Input
The N-560 allows the user to connect the N-560 to AC power ranging from
100 volts AC to 240 volts AC.
AC power enters directly the N-560’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-560.