Welch Allyn Spot Vital Signs 4400, Service Manual

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Symptom Possible cause Suggested action
Replace the main board.
The dual lumen switch failed. Ensure that the cuff is the
properly sized.
Clean the cuff connections.
Replace the cuff and tubing.
Replace the main board.
The NIBP cuff does not inflate.
NIBP is not functioning.
There is a leak in the pneumatic system. Ensure all cuff attachments are
tight. Carefully check for leaks
in blood pressure cuff and
tubing attached to the device.
Replace the cuff.
Update the software.
Perform NIBP functional
checks.
Perform NIBP calibration
checks.
Replace the pump assembly.
Replace the main board.
The NIBP module malfunctioned. Update the software.
Perform NIBP functional
checks.
Perform NIBP calibration
checks.
Replace the pump assembly.
Replace the main board.
The main board malfunctioned. Update the software.
Perform NIBP functional
checks.
Perform NIBP calibration
checks.
Replace the pump assembly.
Replace the main board.
The dual lumen switch failed. Ensure that the cuff is the
properly sized.
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