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Model
What This Guide Helps With
Addresses no power or unexpected shutdowns caused by power supply issues, loose connections, overheating, or external accessory faults.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- If the system shuts down during a procedure, immediately transition to a backup imaging system.
- Expected: Patient care continues without interruption
- Why it matters: Loss of visualization during endoscopy is a critical safety risk
Verify the Reported Issue
- Attempt to power on the system and observe behavior:
- No response at all (no lights, no fan)
- Powers on briefly, then shuts down
- Intermittent shutdown during use
- Expected: Clear identification of symptom type
- Why it matters: Helps differentiate power input vs thermal or load-related issues
Check AC Power Source (Most Common Cause)
- Verify the outlet is functional using a known-good device
- Ensure the system is plugged into a proper hospital-grade outlet or power strip
- Avoid extension cords if present
- Expected: Stable, verified power source
- Why it matters: Inconsistent or failed outlets are a common cause of power issues
Inspect Power Cord and Connections
- Check the AC power cord for damage, fraying, or loose ends
- Ensure the cord is fully seated at both the wall outlet and system power inlet
- Swap with a known-good compatible cord if available
- Expected: Secure, undamaged power connection
- Why it matters: Loose or faulty cords can cause intermittent shutdowns
Check System Power Switch and Indicators
- Confirm the main power switch is functioning properly
- Observe any indicator lights or front panel status LEDs
- Listen for fan or internal startup sounds
- Expected: System shows signs of startup (lights, fan noise)
- Why it matters: Helps determine if power is reaching internal components
Inspect for Overheating Conditions
- Check for blocked vents or dust buildup
- Ensure adequate clearance around the unit (especially in OR towers)
- Confirm cooling fans are operating
- Expected: Proper airflow and normal operating temperature
- Why it matters: Overheating can trigger automatic shutdown to protect internal components
Disconnect External Accessories
- Remove all connected devices (scopes, light source cables, monitors, peripherals)
- Attempt to power on the base unit alone
- Expected: System powers on without accessories
- Why it matters: Faulty peripherals or shorted cables can cause shutdowns
Check Power Distribution (If in Equipment Tower)
- Verify the system is not connected to a failing power strip or isolation transformer
- Try plugging directly into a wall outlet if possible
- Expected: Stable operation on direct power
- Why it matters: Tower power systems can introduce intermittent faults
Attempt Power Cycle Reset
- Disconnect power completely for 60 seconds
- Reconnect and attempt startup
- Expected: System reinitializes normally
- Why it matters: Clears temporary faults or internal protection states
If the Problem Persists
If all external power sources, cables, and environmental conditions have been verified, the issue is likely internal (power supply, internal board, or thermal sensor failure).
Remove the device from service
Label as Out of Service
Send for repair or further bench evaluation
Knowing when to stop prevents unnecessary risk and is part of proper troubleshooting.
Clinical Use Tip
Do not troubleshoot power issues while the system is in active clinical use. Always move the procedure to a functioning backup system before beginning evaluation.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"EVIS EXERA III system would not power on and intermittently shut down during use."
Cause
What was observed during troubleshooting.
Example:
"Loose AC power cord connection at system inlet causing intermittent power loss."
Resolution
What action was taken.
Example:
"Secured power connection and verified stable operation through power cycle testing."
Helpful Details to Include (If Known)
- Outlet tested and verified functional
- Power cord condition and swap performed
- Indicator light behavior observed
- Fan operation confirmed
- Accessories disconnected during testing
- No unusual heat or odor detected
- Final device status (operational or sent for repair)
Final Thought
Power issues should always be approached from the outside in—starting with simple, verifiable causes before assuming internal failure. Patient safety comes first, especially with visualization-dependent procedures. Proper escalation and clear documentation ensure reliability and accountability in Clinical Engineering workflows.
That is successful troubleshooting.