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Asset Type
Electrocardiograph (EKG) Machine
Manufacturer
Model
What This Guide Helps With
Troubleshooting startup failure, repeated rebooting, or frozen software caused by power, battery, peripherals, temporary software states, or service-level system problems.
Step-by-Step Troubleshooting
1. Protect the Patient and Remove the Device From Active Use
Do not troubleshoot a frozen or repeatedly restarting MAC 7 while a patient depends on it for a required ECG.
Provide another verified ECG device and preserve any already acquired patient data when possible.
Expected outcome: Patient testing continues safely and the unstable MAC 7 is available for controlled evaluation.
2. Confirm the Startup Symptom
Determine whether the system is completely unresponsive, powers on but stops at a consistent point, continuously restarts, reaches the interface and freezes, or shuts down unexpectedly.
Note any visible message exactly as displayed without inventing an interpretation.
Expected outcome: The failure pattern is clearly documented for repeatability and escalation.
3. Verify AC Power
Inspect the power cord and confirm connection to a verified functional receptacle.
If the system is attempting to boot on battery, connect it to verified AC power and retest.
Expected outcome: Stable external power is available. If startup succeeds on AC, evaluate the battery or charging system separately.
4. Inspect for Physical or Electrical Warning Signs
Check for liquid exposure, impact damage, unusual odor, excessive heat, damaged power connections, or other obvious hazards.
Do not continue powering the unit if there are signs of electrical or thermal damage.
Expected outcome: No unsafe condition is present. If a hazard is found, immediately remove the device from service and escalate.
5. Disconnect Nonessential External Accessories
With the device safely powered down, remove nonessential USB devices, external scanners, network cables, or other optional peripherals.
Leave only connections required for normal startup.
Expected outcome: The system starts normally with a simplified external configuration. If so, reconnect accessories individually to identify the external trigger.
6. Attempt One Controlled Startup
Use the normal power control to start the MAC 7 and allow the startup process to proceed without repeatedly pressing controls.
Observe whether it reaches a usable state.
Expected outcome: The system completes startup and remains responsive. If it does, continue stability testing rather than immediately returning it to service.
7. Perform a Normal Restart
If the unit reaches the interface but has exhibited a software freeze, perform a normal controlled shutdown and restart.
Do not repeatedly force shutdowns as a substitute for identifying a recurring problem.
Expected outcome: The MAC 7 completes consecutive normal startup and shutdown cycles without freezing or restarting unexpectedly.
8. Verify Basic Device Functions
Once the system starts, test normal controls, patient-cable recognition, ECG acquisition with a simulator, printing if used, and other basic functions appropriate to the reported condition.
Expected outcome: The device remains responsive and completes an ECG workflow without freezing or restarting.
9. Check Whether the Failure Recurs
Allow the device to remain powered under normal bench conditions and repeat representative operations that preceded the complaint when known.
Do not consider an intermittent boot loop resolved solely because one startup succeeds.
Expected outcome: The unit remains stable across repeated normal operation. If it does, complete required return-to-service testing.
10. Escalate Recurring Boot or Software Failure
If the MAC 7 repeatedly fails startup, enters a boot loop, freezes again, or cannot remain stable with verified AC power and peripherals removed, stop external troubleshooting.
Expected outcome: The device is removed from service for qualified software, storage, power, or internal hardware evaluation.
If the Problem Persists
External power, battery dependence, peripherals, and basic restart conditions have been addressed. Remaining possibilities include operating software corruption, internal storage problems, power-management faults, internal hardware failure, or another service-level condition.
The MAC 7 should be:
- Removed from service.
- Labeled Out of Service.
- Sent for repair or bench evaluation.
- Evaluated using appropriate GE Healthcare documentation and approved diagnostic equipment.
- Repaired, restored, or configured only by qualified personnel.
Do not perform unauthorized operating-system recovery, software loading, storage replacement, or service-menu procedures. After corrective action, verify stable startup, ECG acquisition, controls, printing, and applicable communications before return to service. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
A device that boots successfully once after repeated freezes or restarts is not proven reliable; demonstrate stable operation before returning it to the clinical floor.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the MAC 7 repeatedly restarted during startup and would not reach a usable ECG screen."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the boot loop occurred only while a defective USB peripheral was connected and startup completed normally after it was removed."
Resolution
What action was taken.
Example:
"Removed the faulty peripheral from service and verified repeated normal startups, stable operation, and successful ECG acquisition using a simulator."
Helpful Details to Include (If Known)
- Exact startup behavior.
- Exact displayed message.
- AC or battery operation.
- Outlet and power cord checked.
- Damage, heat, or odor observed.
- Peripherals connected.
- Behavior with peripherals removed.
- Number of successful controlled startups.
- ECG simulator test result.
- Whether freezing recurred.
- Final device status.
Final Thought
Start with patient safety, stable power, and external peripherals before assuming software or internal hardware failure. Recurring startup instability requires escalation even if the device temporarily recovers, and return to service requires demonstrated stability.
That is successful troubleshooting.