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Model
What This Guide Helps With
Positioning faults involving table movement, wall stand alignment, tube stand travel, locks, sensors, obstruction, or system readiness.
Step-by-Step Troubleshooting
Ensure Patient Safety First
Stop all table, wall stand, and tube stand movement before troubleshooting.
Action:
- Do not troubleshoot while a patient is on the table unless movement has stopped and the patient is safe.
- If positioning is unreliable, transfer the patient to another room or complete the exam using another system if clinically necessary.
- Watch for pinch points, collision risk, unexpected motion, and patient fall risk.
Expected outcome: The patient and staff are protected before mechanical or positioning checks begin.
Verify the Reported Positioning Problem
Confirm which part of the system is affected.
Action:
- Ask staff whether the issue involves:
- Patient table
- Wall stand / bucky
- Tube stand / overhead tube crane
- Auto-positioning
- Manual movement
- Lock release
- Detent positioning
- Tracking or alignment
- Confirm whether the fault happens during startup, positioning, exposure setup, or after a collision/obstruction.
Expected outcome: The fault is narrowed to the affected section instead of treating it as a general room failure.
Check for Physical Obstruction or Collision Risk
Radiographic room positioning faults are often caused by something blocking normal movement.
Action:
- Inspect around the table base, tabletop path, wall stand travel path, and tube stand rail path.
- Remove stools, step platforms, cables, detector holders, positioning aids, linens, trash cans, or other items that may block movement.
- Check whether the tube, collimator, table, wall stand, or detector housing is close to a collision point.
Expected outcome: If an obstruction was preventing travel, remove it, reset the system if needed, and retest movement. If resolved, return the system to service.
Verify Table Locks and Movement Controls
A table may appear faulty if brakes, locks, or positioning controls are not releasing correctly.
Action:
- Confirm the table is powered and responsive.
- Check that tabletop locks release when the proper control is activated.
- Verify longitudinal, lateral, vertical, and float movements as applicable.
- Listen for abnormal grinding, clicking, or motor strain.
- Stop testing immediately if movement is jerky, uncontrolled, or unsafe.
Expected outcome: The table should move smoothly within normal limits and lock securely when released.
Check Wall Stand / Bucky Positioning
Wall stand faults may be caused by lock issues, detector seating, travel obstruction, or failure to reach a recognized position.
Action:
- Confirm the wall stand moves through its expected range without obstruction.
- Check that the bucky or detector tray is fully seated.
- Confirm locks engage and release correctly.
- Verify the wall stand reaches expected detent or alignment positions.
- Look for loose accessories, cassette/detector tray interference, or foreign objects in the travel path.
Expected outcome: The wall stand should move smoothly, lock securely, and be recognized in position by the system.
Check Tube Stand / Overhead Tube Crane Movement
Tube stand positioning faults can occur when travel locks, detents, rails, column rotation, or tube angulation are not recognized.
Action:
- Verify the tube stand moves freely along the ceiling rails or floor track as designed.
- Check transverse and longitudinal travel.
- Check tube angulation and rotation locks.
- Confirm the tube stand locks and unlocks normally.
- Inspect for obvious rail obstruction, loose cable drape, or accessory interference.
- Do not force movement if the stand binds or will not release.
Expected outcome: The tube stand should move smoothly, stop securely, and report a valid position to the system.
Confirm Detector and Bucky Selection
Some positioning or alignment faults can occur when the selected image receptor does not match the physical setup.
Action:
- Confirm the correct receptor is selected:
- Table bucky
- Wall stand
- Wireless detector
- Free exposure mode, if applicable
- Verify the detector is properly inserted, docked, or selected.
- Check that the tube is aligned to the selected receptor.
- Confirm SID and centering are reasonable for the exam setup.
Expected outcome: The selected receptor should match the physical position of the tube and patient setup.
Check Auto-Positioning or Tracking Mode
Auto-positioning can fail if one section of the system does not know its current position or if a safety condition is active.
Action:
- Disable auto-positioning if safe and try manual positioning.
- Confirm whether the fault occurs only in auto-positioning or also during manual movement.
- Check for messages related to tracking, detent, SID, collision avoidance, or position not reached.
- Do not repeatedly command auto-movement if the system stops due to a safety warning.
Expected outcome: If manual movement works but auto-positioning fails, document that distinction for service evaluation.
Power Cycle the Workstation and Room System Only If Safe
A position fault may clear after system reset if caused by a software state or temporary communication issue.
Action:
- Make sure no patient is on the table and all moving parts are in a safe position.
- Follow the site-approved shutdown and startup process.
- Allow the system to fully initialize.
- Watch for startup errors related to table, wall stand, tube stand, detector, or position sensing.
Expected outcome: If the system initializes normally and positioning functions return, perform a safe functional check before returning to service.
Perform a Basic Functional Check
Before returning the room to use, confirm normal operation of the affected positioning function.
Action:
- Test table movement and locks.
- Test wall stand travel and lock engagement.
- Test tube stand travel, angulation, and lock release.
- Confirm the system recognizes valid positions.
- Confirm no abnormal sound, smell, heat, binding, or intermittent fault is present.
Expected outcome: The system should position smoothly, lock securely, and show no recurring positioning fault.
If the Problem Persists
If the table, wall stand, or tube stand still has a positioning fault after external checks, obstruction checks, lock checks, detector selection verification, and safe reset, the likely cause may be internal.
Possible internal causes may include position sensors, encoders, brake circuits, motor drive components, limit switches, communication issues, or mechanical alignment problems.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench/system evaluation
- Escalated to qualified imaging service support or GE service if required
Knowing when to stop is proper troubleshooting. Do not force movement, bypass safety stops, defeat interlocks, or continue using the room if positioning is unreliable.
Clinical Use Tip
Never troubleshoot table, wall stand, or tube stand motion on an active patient unless movement has stopped and the patient is safe. If positioning is unreliable, move the patient to another radiographic room or imaging system before continuing troubleshooting.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Radiology staff reported that the GE Discovery XR656 tube stand would not move into position and displayed a positioning fault during exam setup."
Cause
What was observed during troubleshooting.
Example:
"Checked room for obstructions, verified detector selection, table and wall stand movement, and confirmed the tube stand lock released but the positioning fault returned during travel."
Resolution
What action was taken.
Example:
"Removed system from service, labeled room Out of Service, documented repeated tube stand positioning fault, and escalated to imaging service for further evaluation."
Helpful Details to Include (If Known)
- Which component was affected: table, wall stand, tube stand, or auto-positioning
- Whether the fault occurred during startup, manual movement, auto-positioning, or exposure setup
- Any displayed error message or fault code
- Whether the room was occupied or patient in use
- Whether physical obstructions were found
- Whether locks released normally
- Whether movement was smooth, slow, jerky, or completely inhibited
- Whether detector/bucky selection matched the exam setup
- Whether power cycle cleared or did not clear the fault
- Any unusual sounds, heat, smell, binding, or collision concerns
- Final device status
Final Thought
Positioning faults on a radiographic system should be handled carefully because they involve patient safety, staff safety, and mechanical motion. Start with the simple external causes first, verify the affected section, avoid forcing movement, and escalate when position sensing or motion control remains unreliable. Clear CCR documentation helps service teams understand whether the problem is mechanical, setup-related, intermittent, or likely internal.
That is successful troubleshooting.