19
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.