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What This Guide Helps With
Use this guide when a displayed or transmitted signal is unstable, noisy, intermittent, or absent during system setup or operation.
Step-by-Step Troubleshooting
1. Protect the Patient and Stop Unreliable Use
Do not base therapy decisions on an unreliable signal. Pause use of the affected function and provide alternate verified monitoring or procedural support as required.
Expected outcome: Clinical decisions are not dependent on an unreliable signal while troubleshooting occurs.
2. Confirm the Affected Signal
Determine exactly which signal is noisy, intermittent, or missing and whether the condition is continuous, movement-related, accessory-specific, or associated with another piece of equipment.
Expected outcome: The affected signal path and failure pattern are clearly defined.
3. Inspect External Cables and Connections
Verify all related external connections are fully seated. Inspect cables, adapters, connectors, and strain reliefs for damage, contamination, looseness, or intermittent contact.
Expected outcome: The complete external signal path is intact. If reseating a loose connection restores a stable signal, proceed to verification.
4. Check Patient-Side and Accessory Connections
Confirm applicable leads, sensors, catheter connections, and external interfaces are connected and positioned as intended by the clinical setup. Do not manipulate patient connections solely for engineering testing while therapy is active.
Expected outcome: Patient-side connections are correct and stable.
5. Look for Movement-Related Intermittency
With the equipment removed from active patient use when necessary, gently observe whether normal cable positioning changes the signal. Do not aggressively flex questionable cables.
Expected outcome: The signal remains stable during normal handling. A cable that changes behavior with movement should be removed from service.
6. Evaluate Environmental Interference
Look for nearby equipment, poorly routed cables, power accessories, or other environmental conditions that could contribute to interference. Separate signal cables from obvious interference sources when practical without changing clinical requirements.
Expected outcome: Signal quality improves or remains stable after obvious environmental contributors are removed.
7. Substitute Known-Good External Components
Replace suspect compatible cables, leads, sensors, or other external components with approved known-good items one at a time.
Expected outcome: If signal quality returns with a known-good component, the original component is isolated as the cause.
8. Verify Relevant Controls and Setup
Confirm applicable user-accessible selections and system setup match the intended procedure. Do not enter restricted service menus or alter calibration data.
Expected outcome: The correct signal source and expected configuration are selected.
9. Compare With an Independent Known-Good Reference
Where appropriate and supported, compare system behavior with approved test equipment or another verified signal path.
Expected outcome: The generator signal is confirmed stable and credible, or the problem is demonstrated to remain within the system.
10. Perform Final Functional Verification
After correction, verify stable signal acquisition, expected display behavior, related alarms or indicators, and system readiness according to approved procedures.
Expected outcome: The signal remains present and stable. The issue is resolved and troubleshooting can stop.
11. Escalate an Unresolved Signal Problem
If the signal remains noisy, intermittent, or missing with known-good external components and correct setup, discontinue clinical use.
Expected outcome: The generator is removed from service for qualified evaluation.
If the Problem Persists
External cables, patient-side accessories, environmental factors, and normal setup have been checked. Remaining possibilities include interface circuitry, signal-processing hardware, internal communication, grounding or infrastructure interaction, software, or service-level configuration.
Remove the generator from service, label it Out of Service, and send it for bench evaluation or manufacturer-supported repair using appropriate documentation and approved test equipment. Only qualified personnel should perform internal repair or protected configuration work.
Verify all affected functions before return to service. Recognizing when stable signal integrity cannot be established externally is proper troubleshooting.
Clinical Use Tip
A signal that intermittently returns is still unreliable until the cause is identified and stable performance is verified.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported an intermittent signal on the DiamondTemp system during setup."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found a damaged external cable that caused the signal to drop when positioned near its connector."
Resolution
What action was taken.
Example:
"Clinical Engineering replaced the cable with an approved known-good cable and verified a stable signal throughout functional testing."
Helpful Details to Include (If Known)
- Signal affected
- Whether signal was noisy, intermittent, or absent
- Relationship to cable movement
- Cable and connector condition
- Patient-side accessory condition
- Known-good substitution results
- Nearby equipment or interference observed
- Settings or source selection
- Test-equipment comparison
- Final device status
Final Thought
Protect the patient from unreliable information, follow the entire external signal path before assuming internal failure, verify signal stability after correction, escalate unresolved problems, and document the actual finding and verification.
That is successful troubleshooting.