GE Giraffe OmniBed Carestation CS1 Service Manual page 100

Chapter 5: Troubleshooting
Servo Controlled Oxygen
Alarm Message
Oxygen Probe
Failure
O2 Cal Lost-No
O2
5-18
Meaning Cause
One of the Defective Sensor(s)
sensors is
reading out of
range (23-280
millivolts or the
difference
between the two
Leak or occlusion in
O2 sensors is
sensor housing area
above 3%.
Defective cable or
connection
Defective Servo O2
board
Servo oxygen has Perform oxygen
never been calibration.
calibrated. Servo
oxygen will not
operate until
initial calibration
is performed.
Action
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.
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.
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.
If the measurement is not the
same as the displayed, replace the
Servo O2 board.
Run calibration.
Service Manual