Table of Contents
Alarm Message Meaning
Elevated oxygen
levels in patient
FiO2>26%
compartment not
controlled by the
servo O2 system.
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.
4.7.3 Servo Controlled Oxygen Troubleshooting Tips
4.7.3.1 Check Supply Valves and Endcap Safety Valve
Power up unit in service mode. Close the canopy. Select Servo O2 on second page. Be sure O2 is connected.
Open V1. You should hear gas flow. Close V1, open V2. You should hear gas flow. Close V2, gas flow should stop.
If supply valves are open an there is no gas flow, check that the endcap safety valve located in the bottom of
the rail is not stuck in the closed position. Check that the two-way valve is not occluded or the spring assembly
has not failed.
If both valves are not opening, test the fuses and supply valves. Disconnect J83 at the Servo O2 board. Measure
the resistance on harness pin 1 to pin 2. It should be the supply valve resistance (50 to 100 ohms). If not, the
fuse is opened or the supply valve is defective. Repeat for the second supply valve with pins 3 to 4. If the valves
check OK, the Servo O2 board is defective.
NOTE: With one supply valve open the flow rate should be a minimum of 35 L/min. With both supply valves
open, the minimum flow rate should be 40 L/min. If the flow rate is low, check that the regulator inlet screen is
not occluded.
4.7.3.2 Check Calibration Valve/Calibration Fan
The calibration valve is located beneath the chassis in the sensor housing. The calibration fan is mounted in
the sensor housing next to the calibration valve. Power up unit in service mode. Select Servo O2 on second
page. Open VC. This should open the calibrate valve and turn on the calibration fan. Verify the calibration fan
is running. If the fan is running then the Servo O2 board is OK and the calibration valve may be defective. If
the fan is not running check the control signal from the Servo O2 board to verify voltage is present when VC is
opened to determine if the fan or board is defective.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
Cause
Auxiliary source of
oxygen supply in patient
compartment.
Leak in the servoO2 system
supply valve.
Chapter 4: Troubleshooting
Action
Check the secondary sources, such as ventilator
or resuscitation bag.
Check supply valves. Refer to the Tips section
(4.7.3).
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Table of Contents
Troubleshooting
