Chapter 5: Troubleshooting
Servo Controlled Oxygen
5-20 Service Manual
Oxygen System
Failure 5
Check O2 Supply
alarm has been
silenced twice
and the sensor1
reading is still not
greater than
23%.
O2 supply not
connected
Verify O2 supply, minimum 45psi
(310 kPa) and 45 L/min is
connected to the inlet.
Calibration valve stuck
in calibration position
Check the calibration valve. Refer
to the Tips section (5.4.4).
Supply valves not
opening
Check supply valves. Refer to the
Tips section (5.4.4).
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.
Oxygen System
Failure 6
The Giraffe
control board
cannot
communicate
with Servo O2
board.
Defective Servo O2
board
Replace servo O2 board.
Defective Cable Check that the cable between the
Giraffe control board and the Servo
O2 board is seated properly.
Oxygen System
Failure 7
Power up test
detected a
problem with the
watchdog circuit.
Defective Servo O2
board
Replace Servo O2 board.
Calibration failed In calibration
mode, after 5
minutes, both
sensors are not
reading between
23 and 55
millivolts so the
device cannot
calibrate.
Calibration valve is not
opening or the
calibration fan is not
turning on.
Check the calibration valve and
fan. Refer to the Tips section (5.4.4).
Defective sensors Replace the sensors.
FiO2>26% Elevated oxygen
levels in patient
compartment not
controlled by the
servo O2 system.
Auxiliary source of
oxygen supply in patient
compartment
Check the secondary sources, such
as ventilator or resuscitation bag.
Leak in the servoO2
system supply valve
Check supply valves. Refer to the
Tips section (5.4.4).
SENSITIVE TO ELECTROSTATIC DISCHARGE CAUTION
An Electrostatic Discharge (ESD) Susceptibility symbol is displayed to alert service personnel that
the part(s) are sensitive to electrostatic discharge and that static control procedures must be
used to prevent damage to the equipment.
Alarm Message Meaning Cause Action
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