Chapter 5: Troubleshooting
Servo Controlled Oxygen
5-18 Service Manual
Oxygen Probe
Failure
One of the
sensors is
reading out of
range (23-280
millivolts or the
difference
between the two
O2 sensors is
above 3%.
Defective Sensor(s) In service mode sensor0 and
sensor1 should be 23-280. If
outside this range replace the
sensors. If in range ensure oxygen0
and oxygen1 read within 3% of
each other or replace the sensors.
Leak or occlusion in
sensor housing area
Be sure sensor housing is seated
properly and the retaining screws
are tight. Be sure sensor gaskets
are in place and the tubing is
seated correctly in the connectors.
Check to be sure that the two vents
in the patient compartment under
the bed are not occluded.
Defective cable or
connection
Measure the voltage at J85.8-
J85.7(sensor0) and J85.6-
J85.7(sensor1) and compare them
to displayed sensor0 and sensor1.
If the measurement is the same as
the displayed, check the cable and
sensor contacts.
Defective Servo O2
board
If the measurement is not the
same as the displayed, replace the
Servo O2 board.
O2 Cal Lost-No
O2
Servo oxygen has
never been
calibrated. Servo
oxygen will not
operate until
initial calibration
is performed.
Perform oxygen
calibration.
Run calibration.
Alarm Message Meaning Cause Action
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