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What This Guide Helps With
Troubleshoots unresponsive touchscreen or keys, failed startup, intermittent controls, power connection, external accessory, contamination, and configuration-related problems.
Step-by-Step Troubleshooting
1. Protect the Patient and Remove an Unreliable Monitor From Clinical Dependence
If the FM50 will not start, freezes, or has unreliable controls during patient monitoring, move the patient to another verified fetal monitor before troubleshooting.
Do not continue using a monitor that cannot reliably accept operator input or complete normal startup.
Expected outcome: Patient monitoring is transferred to dependable equipment.
2. Confirm the Exact Failure
Determine whether the monitor:
- Will not power on
- Begins startup but does not complete it
- Restarts unexpectedly
- Has an unresponsive touchscreen
- Has one or more unresponsive physical keys
- Responds intermittently
- Has a display that is on but cannot be controlled
Note whether the problem began after cleaning, movement, accessory connection, or power interruption.
Expected outcome: The failure is classified as power/startup, touchscreen, key-control, or intermittent system behavior.
3. Inspect for Physical Damage or Contamination
Inspect the monitor exterior for:
- Cracked touchscreen or display
- Liquid residue
- Cleaning solution around screen edges or keys
- Stuck or damaged buttons
- Impact damage
- Loose enclosure sections
- Abnormal heat, odor, or discoloration
Immediately remove the unit from service if there are signs of liquid intrusion, overheating, burning odor, or significant physical damage.
Expected outcome: The monitor is physically safe for continued external testing.
4. Verify AC Power
Inspect the power cord and accessible power connection.
Confirm the outlet is functional using an approved tester or another appropriate verification method.
Reseat the power cord at the monitor and power source.
Expected outcome: The monitor receives stable AC power from a verified source.
5. Remove Nonessential External Accessories
With the monitor out of patient use, disconnect nonessential external accessories, transducers, network cables, USB accessories, and optional peripherals as appropriate.
Attempt a normal startup with only the connections required for basic operation.
Expected outcome: The monitor completes startup without interference from an external accessory or peripheral.
If startup succeeds, reconnect external accessories one at a time to identify whether the failure returns.
6. Evaluate Battery-Related Behavior When Applicable
If the unit can operate from battery, compare behavior on verified AC power and battery operation without opening the device.
Note whether:
- Startup occurs only on AC
- The unit shuts down when AC is removed
- Battery status appears abnormal
- The issue occurs regardless of power source
Do not infer battery condition solely from runtime without appropriate testing.
Expected outcome: The power-related behavior is characterized sufficiently to separate an external AC issue from a battery or internal power issue.
7. Evaluate Touchscreen Response
Once the monitor completes startup, verify touchscreen response across the normal user interface.
Check for:
- Areas that consistently fail to respond
- Repeated unintended touches
- Delayed response
- Operation affected by moisture or residue
- Difference between touchscreen and physical-key response
Clean the screen only using approved methods and allow it to dry before retesting.
Expected outcome: The touchscreen responds consistently to normal input without false or missed selections.
8. Evaluate Physical Keys
Test normal accessible keys individually.
Check for:
- Sticking
- Mechanical damage
- Intermittent response
- A single failed key versus all keys
- Differences between touchscreen and key operation
Do not disassemble the control panel.
Expected outcome: All required operator controls respond reliably.
9. Observe Startup With a Minimal Configuration
Perform another startup with nonessential peripherals still removed.
Observe for:
- Consistent completion of startup
- Frozen display
- Uncommanded restart
- Loss of control response
- Any displayed message that can be documented exactly
Do not invent an interpretation for an unfamiliar message; record it verbatim and consult authorized service documentation.
Expected outcome: The monitor starts consistently and reaches normal operating condition.
10. Perform Final Functional Verification
After correcting any external issue, reconnect required accessories and verify:
- Consistent startup
- Touchscreen operation
- Key operation
- Stable display
- Required fetal-monitor functions
- Alarm operation as applicable
- No unexpected restart or freeze
Use approved test equipment and institutional return-to-service procedures.
Expected outcome: The monitor starts reliably, accepts operator input normally, and remains stable throughout functional verification.
If successful, troubleshooting can stop.
11. Escalate Persistent Control or Startup Failure
If the monitor fails startup with minimal external connections, continues restarting, freezes, or has persistent touchscreen or key failures after cleaning and external checks, remove it from service.
Expected outcome: An unreliable operator interface or startup condition is prevented from returning to clinical use.
If the Problem Persists
External power, outlet condition, accessories, visible contamination, peripheral connections, and normal control checks have been addressed.
Persistent failures may involve the display or touch interface, control electronics, internal power system, software, stored configuration, or another service-level condition. Do not open the monitor or perform board-level troubleshooting unless specifically authorized and trained under the appropriate service procedure.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate Philips documentation and approved test equipment
- Repaired or configured only by qualified personnel
After corrective action, complete applicable functional, alarm, and electrical safety testing before returning the monitor to clinical use.
Knowing when to stop external troubleshooting and escalate is proper troubleshooting.
Clinical Use Tip
A fetal monitor with intermittent touchscreen or key response is not dependable simply because the monitoring waveform remains visible; operator control must also be reliable.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the Avalon FM50 powered on but the touchscreen intermittently failed to respond to operator selections."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found dried cleaning residue on the touchscreen surface, while physical keys and all monitor functions operated normally."
Resolution
What action was taken.
Example:
"Cleaned the touchscreen using the approved method, allowed the surface to dry, and verified consistent touch response, normal controls, stable startup, and complete functional operation."
Helpful Details to Include (If Known)
- Power-on versus startup behavior
- AC and battery behavior
- Outlet verification
- Physical damage or contamination
- Touchscreen areas affected
- Keys affected
- External accessories connected
- Behavior with minimal configuration
- Exact displayed message, if present
- Unexpected restart or freeze behavior
- Final functional test result
- Final device status
Final Thought
Startup and control failures require patient monitoring continuity first, followed by simple external checks for power, accessories, contamination, and physical damage. Verify reliable controls and stable operation before return to service, and escalate persistent system-level faults rather than assuming a specific internal component.
That is successful troubleshooting.