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Troubleshooting
Troubleshooting
Problem Possible Cause Possible Solution
The device won’t turn on. The batteries are depleted. Replace all 6 batteries.
The batteries are installed incorrectly. Verify battery orientation, illustrated
inside the battery compartment or in
Figure 2: Installing Batteries in the
8500 section of this operator’s
manual.
A metal contact in the battery
compartment is missing or damaged.
Contact Nonin Technical Service.
A dash appears in the leftmost
position of the SpO
2
display.
A sensor fault exists (disconnect,
failure, misalignment, or incompatibility
with the monitor).
Verify that the sensor is correctly
connected to the device and the
patient; replace sensor if the
condition persists.
Dashes are displayed in both
the SpO
2
and Pulse Rate
displays.
No signal is detected because the
sensor is not plugged in.
Verify the sensor connections.
Sensor failure. Replace the sensor.
Numeric displays are blinking
at once per second.
Low batteries. Replace all 6 batteries.
Incorrect battery installation. Verify battery orientation.
The displayed pulse rate does
not correlate to the pulse rate
displayed on the ECG monitor.
Excessive motion at the sensor site
may be prohibiting the device from
detecting a consistent pulse signal.
Eliminate or reduce the cause of the
motion or
reposition the sensor to a
new sensor site.
The patient may have an arrhythmia
resulting in some heart beats that do not
detect a pulse quality signal at the
sensor site.
Assess the patient.
A non-compatible sensor is being used. Replace the sensor with a Nonin-
branded PureLight sensor.
The ECG monitor may not be
functioning properly.
Assess the patient.
An inconsistent Pulse Rate or
an amber Pulse Quality
display during the use with
electrosurgical unit (ESU).
The ESU may be interfering with the
pulse oximeter performance.
Assess the patient. Move the device,
cables, and sensors as far away
from the ESU as possible.
The Pulse Quality LED is
blinking amber with each
pulse.
The quality of the pulse signal at the
sensor site is inadequate.
Assess the patient. Reposition
sensor or
select an alternate sensor
site.
Numeric display segments are
missing.
Defective LEDs. Discontinue use of the device.
Degradation of device
performance.
Electromagnetic interference (EMI). Remove the device from the EMI
environment.
26


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