Covidien Nellcor OxiMax N-560, Service Manual

Page: 126 / 158

Technical Discussion
116
Front Panel PCB and Controls
Front Panel Display
Visual patient data and N-560 status are provided by the Front Panel Display.
At power up, all indicators are illuminated to allow verification of their proper
operation.
There are two sets of three, 7-segment displays. One set displays %SpO2 and
the other displays pulse rate. A decimal point immediately to the right of
either display indicates that an alarm limit for that parameter is no longer set
at the power-on default value.
Between the two sets of 7-segment displays is a 10-segment
Pulse
Amplitude
indicator. The
Pulse Amplitude
indicator illuminates with each
pulse beat. The number of segments illuminated indicates the relative signal
strength of the pulse beat. A tone will accompany each pulse beat. The sound
of the tone changes pitch with the %SpO2 level being measured.
Below the 10-segment
Pulse Amplitude
indicator is a 8-segment display.
The 8-segment display illuminates with
SatSecond
values. The first segment
of the 8-segment display indicates the
SatSecond
alarm on/off. The number of
segments illuminated indicates the relative values of the
SatSecond
.
Seven LEDs and icons are also located on the Front Panel Display part. An
LED illuminated next to an icon indicates a function that is active. Functions
indicated by the LEDs are AC/Battery Charging, Low Battery, Alarm Silence,
Interference, Pulse Search, Sensor Off, and Sensor Message.
Button Interface
The Button Interface is mounted as part of Front Panel PCB. Seven keys
allow the operator to access different functions of the N-560.
These keys allow the user to select and adjust the alarm limits, cycle power to
the N-560, and silence the alarm. Alarm volume and alarm silence duration
can also be adjusted via the keypad. A number of other functions can be
accessed by pressing the
SatSeconds
Alarm Limit button and
Pulse Rate
Alarm Limit
button simultaneously and then selecting the desired option with
the
Adjust Up
or
Adjust Down
button. These functions are discussed in
greater detail in
Audible Alarm Settings and Service Functions
on page 29.