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What This Guide Helps With
Troubleshooting abnormal mechanical sound or inconsistent compression performance caused by power, LifeBand, positioning, obstruction, or mechanical condition.
Step-by-Step Troubleshooting
1. Stop Using Questionable Compression Performance
If the AutoPulse produces unusual motor noise, weak compressions, or visibly inconsistent compression performance during patient care, immediately transition to manual CPR or another verified device.
Do not continue therapeutic use while attempting to determine whether compression performance is adequate.
Expected outcome: CPR continues using a reliable method while the suspect platform is removed from service.
2. Confirm the Reported Condition Off the Patient
Determine whether the concern is:
- Grinding, rattling, scraping, or other new mechanical noise
- Apparent reduction in compression force
- Uneven LifeBand movement
- Intermittent mechanical slowing
- Inconsistent operation during a controlled test
Do not infer compression depth from visual observation alone when an approved test method is required.
Expected outcome: The mechanical symptom is reproducible or clearly documented under non-patient conditions.
3. Inspect the LifeBand
Check the LifeBand for:
- Twisting
- Folding
- Incorrect installation
- Damage
- Contamination
- Uneven routing
- Foreign material
Expected outcome: The LifeBand is correctly installed and free of external mechanical restriction.
4. Substitute a Known-Good LifeBand
If the original LifeBand is questionable, install a known-good compatible LifeBand.
Expected outcome: If abnormal noise or inconsistent movement disappears, remove the original LifeBand from service and proceed to verification.
5. Verify Battery Condition
Install a known-good charged battery.
Weak or unstable power should be ruled out before assuming a drive-system failure.
Expected outcome: Platform power remains stable throughout testing. If performance normalizes with the replacement battery, isolate the original battery for evaluation.
6. Inspect the Platform for Obstruction or Damage
Look for:
- External deformation
- Impact marks
- Foreign objects
- Debris in accessible moving areas
- Evidence of fluid intrusion
- Loose exterior components
Do not open the drive mechanism.
Expected outcome: No external mechanical obstruction or damage is present.
7. Verify Setup and Positioning
During an approved non-patient test, ensure the LifeBand and platform are arranged without external resistance from linens, straps, cables, accessories, or other objects.
Expected outcome: No setup condition is artificially loading or restricting the mechanism.
8. Perform an Approved Functional Performance Check
Use the appropriate approved test setup and equipment to evaluate operation.
Distinguish between subjective complaints such as "weak" and an actual verified performance failure.
Expected outcome: Mechanical operation is smooth and performance meets applicable service verification requirements. If performance is verified normal and the noise does not recur, troubleshooting can stop.
9. Escalate Abnormal Mechanical Operation
Grinding, persistent abnormal noise, repeated slowing, inconsistent mechanical output, or failure of approved performance testing requires service evaluation.
Expected outcome: The AutoPulse is removed from service and not returned to clinical use until repaired and verified.
If the Problem Persists
Common external causes such as battery condition, LifeBand installation, accessory damage, obstruction, and setup have been ruled out.
The remaining problem may involve the motor, drive train, sensing, mechanical alignment, or another internal service-level condition. The device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate ZOLL documentation and approved test equipment
- Repaired only by qualified personnel
Do not perform internal drive or motor repair without authorized service procedures.
After repair, complete required mechanical performance and return-to-service testing.
Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Do not rely on subjective appearance alone when compression performance is questioned; use an approved test method before returning the AutoPulse to clinical readiness.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Staff reported that the AutoPulse sounded unusually loud and the LifeBand movement appeared inconsistent during a readiness check."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the LifeBand was twisted and creating abnormal mechanical resistance."
Resolution
What action was taken.
Example:
"Reinstalled the LifeBand correctly, completed approved functional testing, and verified smooth operation without abnormal noise."
Helpful Details to Include (If Known)
- Description of abnormal sound
- Whether the issue occurred during patient use or readiness testing
- LifeBand condition
- Battery used
- External damage
- Contamination or obstruction
- Results with known-good LifeBand
- Results with known-good battery
- Approved performance test result
- Final device status
Final Thought
Mechanical performance concerns require immediate patient backup, then controlled isolation of the LifeBand, battery, setup, and external condition. Confirm performance objectively and escalate abnormal drive behavior rather than guessing at an internal component.
That is successful troubleshooting.