Alarm Message Meaning
Cause
Action
Oxygen Probe
Failure
One of the
sensors is reading
out of range
(23-280 millivolts
on units with
1.3 software
or higher) 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 infant 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
unit has never
been calibrated.
Unit will not
operate until
initial calibration
is performed.
Perform oxygen calibration.
Run calibration.
Cell voltage less
than 33 mV.
Earlier software versions did
not store voltages this low.
Replace display software with 1.62 or higher.
Oxygen System
Failure 1
The sensor
plug thermistor
temperature
reading is out
of the range:
15C-55C.
Unit is cold: <15 degrees C.
Allow unit to warm up.
Cooling fan is not running
when the sensor housing
temperature gets above 50
degrees.
Test the cooling fan. Refer to the Tips section
Defective sensor plug
thermistor or cable.
Disconnect the cable and measure the resistance
of the thermistor between J85.4 and J85.5. Refer
to R/T chart (the temperature to resistance curve)
in the Tips section (4.7.3). If sensor is shorted,
open, or values don’t agree with the R/T chart,
replace the sensor plug assembly or the cable.
Defective servo O2 board.
If resistance is in range replace the servo O2
board.
Oxygen System
Failure 2
The RH reading is
out of valid range:
1-99. When out of
range it displays 0
in service mode.
Defective sensor plug.
Measure the humidity sensor voltage between
J85.2 and J85.1. If the voltage is outside the
range of 0.7V- 4.0V, replace the sensor plug
assembly.
Defective servo O2 board.
If it is in the correct range, replace the servo O2
Board.
Oxygen System
Failure 3
The checksum
test performed
during power up
testing failed.
Defective Microcontroller.
Replace microcontroller U6 on the Servo O2
board.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
6600-0343-000 104
67
Chapter 4: Troubleshooting
Summary of Contents for Giraffe OmniBed
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