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What This Guide Helps With
Troubleshooting when the BV Pulsera will not allow X-ray exposure due to safety, connection, setup, or system readiness conditions.
Step-by-Step Troubleshooting
Ensure Patient Safety First
Before troubleshooting, confirm the C-arm is not needed for an active procedure.
Action:
- Confirm with the OR team whether the system failed before, during, or after a case.
- If a patient is present, make sure imaging needs are covered by another available C-arm if necessary.
- Do not repeatedly attempt exposure without understanding why the system is preventing X-ray.
- Confirm radiation safety practices are followed before any test exposure.
Expected outcome: Patient care and staff radiation safety are protected before troubleshooting begins.
Why it matters: “Exposure not permitted” is often a protective lockout. Forcing repeated attempts without confirming the cause can delay care or create unsafe workflow.
Verify the Exact Reported Condition
Confirm what the system is actually doing when exposure is requested.
Action:
- Check whether the system displays a message such as:
- Exposure not permitted
- No X-ray
- X-ray inhibited
- System not ready
- Door, brake, footswitch, hand switch, generator, or tube-related warning
- Ask staff whether the issue occurs with the hand switch, footswitch, or both.
- Observe whether the system beeps, displays an error, or does nothing when exposure is attempted.
Expected outcome: You confirm whether the problem is a true exposure lockout, a switch/accessory issue, or a broader system readiness fault.
If the issue is only with one exposure control, continue checking that control before suspecting the generator.
Confirm the System Is Fully Booted and Ready
Exposure may be blocked if the BV Pulsera application has not fully loaded or the system is not in a ready state.
Action:
- Verify the workstation and C-arm have completed startup.
- Check that the imaging application is open and responsive.
- Confirm the monitor displays the expected imaging screen rather than a startup, login, error, service, or standby screen.
- Wait for any initialization messages to clear.
Expected outcome: The system reaches normal operating mode and allows preparation for exposure.
If the system was still initializing and exposure becomes available after startup completes, document the finding and stop.
Check Emergency Stop and Safety Interlocks
An active emergency stop or safety interlock can prevent X-ray exposure.
Action:
- Inspect emergency stop buttons on the system, workstation, or relevant control areas.
- Confirm no emergency stop is pressed or latched.
- Release any engaged emergency stop according to normal hospital procedure.
- Power cycle the system if required after releasing the emergency stop.
Expected outcome: The system recognizes the safety interlock as cleared.
If exposure is restored after clearing an emergency stop, document the cause and stop.
Verify Power and Mains Connection
Low, unstable, or missing mains power can prevent generator readiness.
Action:
- Confirm the system is connected to a known-good hospital-grade outlet.
- Verify the power cord is fully seated and not damaged.
- Check that the outlet has power.
- Avoid using extension cords or questionable power strips.
- Confirm the system is not relying on an unstable power source.
Expected outcome: The C-arm has stable AC power and can support generator operation.
If correcting the power connection restores X-ray readiness, document the outlet or power issue and stop.
Check the Hand Switch and Footswitch Connections
The system may not permit exposure if the exposure control is disconnected, damaged, or not recognized.
Action:
- Inspect the hand switch cable and connector.
- Inspect the footswitch cable and connector if used.
- Look for bent pins, loose connections, crushed cable sections, fluid contamination, or physical damage.
- Disconnect and reconnect the exposure control securely if appropriate.
- Test exposure readiness using the alternate control if available and safe.
Expected outcome: The system recognizes a valid exposure control.
If one switch works and the other does not, remove the failed switch from service and document the accessory failure.
Confirm Correct Operating Mode and Exam Setup
Some systems will not allow exposure if the exam, mode, or imaging setup is incomplete.
Action:
- Confirm an exam or patient/session is selected if required by site workflow.
- Verify the system is not in review-only, standby, service, shutdown, or non-imaging mode.
- Check that fluoroscopy or radiography mode is selected appropriately.
- Confirm no on-screen prompt is waiting for user acknowledgement.
Expected outcome: The system is placed in a valid imaging mode where exposure is allowed.
If selecting the proper mode restores exposure, document the setup issue and stop.
Check C-Arm and Workstation Communication
The mobile viewing station and C-arm must communicate properly for imaging operation.
Action:
- Confirm the C-arm and workstation are connected as normally configured.
- Inspect visible communication cables between system components if applicable.
- Check for loose, damaged, or disconnected connectors.
- Confirm the workstation display updates normally when system settings are changed.
Expected outcome: The workstation and C-arm appear synchronized and responsive.
If communication is restored after reseating an external connection, document the connection issue and stop.
Check for Tube, Generator, or Cooling-Related Messages
Exposure may be inhibited if the tube or generator is overheated, not ready, or reporting a fault.
Action:
- Look for messages related to tube heat, generator readiness, cooling, overload, or exposure inhibit.
- Ask staff whether the system had been used heavily before the failure.
- Allow appropriate cooling time if the system indicates tube heat or thermal limitation.
- Do not continue attempting exposures during a thermal lockout.
Expected outcome: Temporary heat-related lockouts clear after cooling, or a persistent generator/tube fault is identified.
If the message clears after cooling and exposure is restored, document the thermal condition and final status.
Inspect Mechanical Position and Brakes
Some C-arm conditions may prevent exposure if the system is not positioned, locked, or detected correctly.
Action:
- Verify the C-arm is positioned safely.
- Check that required locks, brakes, or movement controls are not creating an abnormal system state.
- Confirm no collision, obstruction, or abnormal mechanical condition is present.
- Listen for unusual sounds from the C-arm during positioning.
Expected outcome: No obvious mechanical or positioning issue is preventing imaging.
If repositioning or correcting a brake/lock condition restores exposure, document the finding and stop.
Check Dose, Collimator, and Imaging Settings
Extreme or invalid imaging settings can contribute to exposure problems.
Action:
- Review the selected imaging mode, dose level, collimator position, and field setup.
- Confirm settings appear reasonable for normal test imaging.
- Reset to a known standard exam or default setup if permitted by site procedure.
- Avoid changing clinical protocol settings without confirming with authorized staff.
Expected outcome: Imaging settings are valid and do not prevent exposure.
If correcting the setup restores X-ray, document the setting-related cause and stop.
Power Cycle the System Only When Safe
A controlled restart may clear a temporary software or readiness state.
Action:
- Confirm the system is not actively needed for a patient.
- Shut down the BV Pulsera using the normal shutdown process.
- Wait briefly before powering back on.
- Allow the system to fully boot.
- Confirm whether exposure is now permitted.
Expected outcome: Temporary software or startup state issues are cleared.
If the system works normally after restart, perform a basic functional check and document the restart resolution.
Perform a Safe Functional Check
After any corrective action, verify the system is safe and functional before returning it to service.
Action:
- Use approved test objects or site procedure for a non-patient test exposure.
- Confirm the system permits exposure.
- Verify image appears on the monitor.
- Check that fluoro activation indicators and audible signals behave normally.
- Confirm no active error messages remain.
Expected outcome: X-ray exposure is permitted, image acquisition works, and the system is ready for clinical use.
If the functional check passes, return the unit to service according to department policy.
If the Problem Persists
If the BV Pulsera still displays No X-ray, Exposure not permitted, or refuses to expose after external checks are complete, common user-accessible causes have been ruled out.
The issue may involve an internal generator fault, tube/tank issue, exposure control circuit, communication fault, safety interlock circuit, software fault, or internal power problem.
The device should be removed from service, labeled Out of Service, and sent for repair, vendor service, or bench evaluation.
Do not continue troubleshooting into internal high-voltage, generator, or X-ray control circuitry unless you are trained, authorized, and following approved service documentation.
Knowing when to stop is proper troubleshooting.
Clinical Use Tip
Do not troubleshoot exposure lockouts on an active patient unless patient care is already protected. If imaging is needed during a case, move to another verified C-arm first. Treat exposure inhibit messages as safety-related until proven otherwise.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"OR staff reported that the Philips BV Pulsera would not allow X-ray exposure and displayed an exposure not permitted condition during setup."
Cause
What was observed during troubleshooting.
Example:
"Found the footswitch connection loose at the C-arm, preventing the system from recognizing the exposure control."
Resolution
What action was taken.
Example:
"Reseated the footswitch connector, verified exposure readiness, completed a test image, and returned the C-arm to service."
Helpful Details to Include (If Known)
- Alarm behavior or exact message displayed
- Accessories swapped, including hand switch or footswitch
- Power behavior, outlet tested, power cord condition, and system boot status
- Environmental factors such as heavy use, heat, cooling, fluid exposure, or unusual smell
- Indicator lights, fluoro activation indicators, audible signals, generator messages, tube heat messages, or cooling messages
- Final device status, including whether restart changed the condition and whether the functional test passed
Final Thought
A C-arm that will not permit exposure should be approached logically and safely. Start with patient safety, power, startup status, exposure switches, connections, and system readiness before suspecting internal generator or tube failure. If the external causes are ruled out and exposure remains inhibited, remove the unit from service and document the issue clearly.
That is successful troubleshooting.