Welch Allyn Spot Vital Signs 4400, Service Manual

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Symptom Possible cause Suggested action
Replace the sensor.
Perform SpO2 functional
checks.
The SpO2 module malfunctioned. Perform SpO2 functional
checks.
Update the software.
Replace the SpO2 module.
Replace the main board.
The main board malfunctioned. Update the software.
Replace the main board.
SpO2 measurements are
inaccurate.
The sensor is faulty or incorrectly attached. Connect the sensor to the
patient and the device.
Replace the sensor.
Perform SpO2 functional
checks.
The sensor is contaminated or dirty. Clean the optical area of the
sensor.
Replace the sensor.
Perform SpO2 functional
checks.
The SpO2 module malfunctioned. Perform SpO2 functional
checks.
Update the software.
Replace the SpO2 module.
Replace the main board.
The main board malfunctioned. Update the software.
Replace the main board.
Attempt to upgrade the
software failed.
The hardware or software between the Host
and the SpO2 module is incompatible.
Retry software update.
Replace the SpO2 module.
Replace the main board.
Service manual Appendix 103