Siemens Healthineers MOBILETT Mira

Asset Type

Mobile X-Ray System

Manufacturer

Siemens Healthineers

Model

MOBILETT Mira

What This Guide Helps With

Drive, brake, column, or arm positioning issues that prevent safe movement, positioning, parking, or bedside imaging.

Step-by-Step Troubleshooting

Ensure Patient Safety First

Do not troubleshoot movement or arm positioning issues while the unit is close to a patient, bed, stretcher, staff member, or wall.

Action:

• Move the patient to another imaging option if imaging is urgent.
• Keep the MOBILETT Mira away from the patient until the movement or positioning fault is understood.
• If the unit cannot be moved safely, stop and request help before attempting repositioning.

Expected outcome: Patient and staff safety are protected before mechanical or drive troubleshooting begins.

Why it matters: Mobile X-ray systems are heavy, powered, and have moving arms, brakes, and columns. A positioning fault can create collision, crush, or tip hazards.

Verify the Reported Problem

Confirm what clinical staff actually experienced.

Action:

Ask whether the fault involved:

• Drive assist not working
• Brake stuck or not holding
• Column not raising or lowering
• Arm not extending, rotating, or locking properly
• System refusing exposure due to positioning
• Unusual resistance, drifting, grinding, or clicking

Expected outcome: The issue is narrowed to drive, brake, column, arm, or positioning behavior.

Why it matters: “Positioning fault” can mean either a mechanical movement issue or a system interlock preventing exposure.

Check for Physical Obstruction

Inspect the unit externally before assuming a motor, brake, or column failure.

Action:

Check around the wheels, base, column, arm, tube head, handle, and detector storage area.

Look for:

• Cords wrapped around wheels
• Debris under casters
• Bed linens caught in the base
• Accessory bags blocking movement
• Objects preventing arm travel
• Tube head or arm contacting nearby equipment

Expected outcome: Any external obstruction is removed and movement returns to normal.

If this resolves the issue, return the unit to service after confirming safe movement and documenting the obstruction.

Confirm the Unit Is Fully Powered On and Ready

Drive and positioning functions may not behave correctly if the system is not fully initialized.

Action:

• Check that the system is powered on normally.
• Confirm the display is responsive.
• Look for active warning messages, interlock messages, or startup errors.
• Allow the unit to complete boot-up before testing movement.

Expected outcome: The system reaches normal operating status without startup or safety warnings.

Why it matters: Some movement, brake, or exposure functions may be inhibited until the system completes startup checks.

Check Battery Charge Status

Low battery condition can affect drive assist, motorized movement, brakes, or system readiness.

Action:

• Check the battery indicator or system battery status.
• Connect the unit to a known-good AC outlet if battery charge is low.
• Allow adequate charge time if the battery is depleted.
• Observe whether movement or positioning functions improve while connected to AC power.

Expected outcome: The unit has enough battery capacity to support powered movement and positioning.

If the fault clears after charging, document the battery condition and verify the unit operates normally before returning it to service.

Inspect Power Cord and Charging Connection

A poor charging connection can lead to low battery complaints that appear as drive or positioning problems.

Action:

• Inspect the power cord for damage, looseness, bent blades, or strain.
• Verify the cord is seated correctly at the unit and wall outlet.
• Test the outlet if there is concern about power.
• Check for charging indicators on the unit.

Expected outcome: The unit charges normally and does not show power or battery-related warnings.

If charging is abnormal, remove the unit from service for electrical safety and charging system evaluation.

Check Brake Release and Brake Engagement Behavior

Determine whether the issue is a stuck brake, brake not holding, or normal brake engagement being mistaken for a fault.

Action:

• On a clear, level floor, test whether the unit releases and rolls as expected.
• Check whether the brake engages when the handle or controls are released.
• Listen for abnormal brake clicking, dragging, or grinding.
• Verify the unit does not roll unexpectedly when parked.

Expected outcome: Brakes release when commanded and hold the unit securely when parked.

If the brake does not hold, do not return the unit to service. Remove it from use because uncontrolled movement is a safety hazard.

Check Drive Handle or Drive Assist Response

If the unit has powered drive assist, confirm whether the handle input is being recognized.

Action:

• With the path clear, gently test forward and reverse movement.
• Confirm whether the drive assist responds smoothly.
• Check whether the issue occurs in one direction only or both directions.
• Observe for delay, jerking, sudden stopping, or no response.

Expected outcome: Drive assist responds predictably and stops safely when released.

If the drive response is erratic, remove the unit from service. Do not continue clinical use with unpredictable powered movement.

Inspect Wheels and Casters

Wheel or caster problems can mimic drive motor, brake, or steering faults.

Action:

Check all visible wheels and casters for:

• Flat spots
• Loose debris
• Fluid residue
• Broken tread
• Objects lodged in the wheel
• Uneven rolling
• Resistance during manual movement

Expected outcome: Wheels rotate freely and the unit tracks normally.

If a wheel or caster is physically damaged, remove the unit from service for repair.

Check Floor and Environment Conditions

Mobile X-ray drive problems may be caused by the environment rather than the unit.

Action:

• Test movement on a clear, dry, level floor.
• Avoid thresholds, elevator gaps, wet areas, floor mats, cords, and uneven transitions.
• Compare behavior in the reported area versus a controlled open area.

Expected outcome: The issue either follows the unit or is linked to the floor/environment.

If the unit operates normally in a clear area, document the environmental cause and educate staff as appropriate.

Verify Column Movement

Check whether the column raises, lowers, rotates, or locks normally, depending on the reported issue.

Action:

In a safe open area, move the column through normal external positioning ranges without forcing it.

Watch for:

• Binding
• Uneven movement
• Failure to lock
• Drifting after release
• Unexpected stopping
• Warning messages

Expected outcome: Column movement is smooth, controlled, and secure after positioning.

If the column does not lock or drifts, remove the unit from service. A drifting column or tube arm is a patient and staff safety risk.

Verify Arm and Tube Head Positioning

Inspect the arm and tube head externally for safe positioning behavior.

Action:

• Move the arm and tube head through normal positioning motions.
• Confirm locks, detents, and release controls behave normally.
• Check whether the arm holds position without dropping, drifting, or springing back.
• Do not force the arm past resistance.

Expected outcome: The arm and tube head move smoothly and remain stable when released.

If the arm drops, drifts, sticks, or will not lock, remove the unit from service for mechanical evaluation.

Check Parking and Transport Position

Some mobile X-ray systems may restrict drive, exposure, or movement if the column, arm, detector, or tube head is not properly parked or positioned.

Action:

• Return the arm, tube head, and detector storage components to their normal transport or park position.
• Check for any positioning prompts or interlock messages.
• Verify whether the fault clears after proper parking.

Expected outcome: The system recognizes the unit position and allows normal transport or operation.

If the fault clears, confirm proper movement and document the positioning/interlock condition.

Check for Obvious Mechanical Damage

Look for signs the unit was hit, dropped, forced, or driven into an object.

Action:

Inspect the base, column, arm, tube head, handle, bumpers, and covers.

Look for:

• Cracked covers
• Bent arm components
• Loose panels
• Scrape marks
• Misalignment
• Unusual gaps
• Hardware visibly out of place

Expected outcome: No obvious damage is found, or damage is identified as the likely cause.

If damage is present, remove the unit from service and route it for repair evaluation.

Restart the System if Safe

A software or control state issue may clear after a controlled restart.

Action:

• Move the unit to a safe location.
• Power down the system using the normal shutdown method.
• Wait briefly, then restart the unit.
• Observe whether the same drive, brake, column, or arm fault returns.

Expected outcome: The unit restarts normally and movement/positioning functions operate correctly.

If the fault does not return, perform a careful functional check before returning the unit to service.

Perform a Basic Functional Check

Before returning the unit to clinical use, verify the problem is resolved.

Action:

Confirm:

• Unit powers on normally
• Battery status is acceptable
• Brakes release and hold correctly
• Drive assist responds smoothly
• Wheels roll freely
• Column and arm move safely
• Tube head holds position
• No active warnings remain

Expected outcome: The unit is safe to move, position, and use for bedside imaging.

If any movement, brake, column, or arm behavior remains abnormal, do not return the unit to service.

If the Problem Persists

If the MOBILETT Mira still has a drive, brake, column, or arm positioning fault after these checks, common external causes have been ruled out. The issue may involve an internal drive component, brake assembly, position sensor, column mechanism, arm support system, motor control circuit, safety interlock, or system calibration issue.

The device should be:

• Removed from service
• Labeled Out of Service
• Sent for repair or bench evaluation

Do not force the arm, override brake concerns, or continue using the unit if movement is unpredictable. Knowing when to stop is proper troubleshooting.

Clinical Use Tip

Do not troubleshoot a mobile X-ray movement fault at the bedside during active patient care. Move the patient care need to another imaging device first, then troubleshoot the MOBILETT Mira only in a safe, open area with adequate clearance. Therapy continuity and patient care should not depend on a unit with unresolved movement, braking, column, or arm positioning behavior.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Clinical staff reported that the Siemens MOBILETT Mira was difficult to move and displayed a positioning-related fault when attempting bedside imaging."

Cause

What was observed during troubleshooting.

Example:
"External inspection found the tube arm was not fully returned to its transport position, causing the system to remain in a safety interlock condition."

Resolution

What action was taken.

Example:
"Repositioned the arm into the proper park position, confirmed the warning cleared, verified brake release, drive assist, column movement, and arm stability, and returned the unit to service."

Helpful Details to Include (If Known)

• Outlet tested, if charging or battery condition was involved
• Battery level at time of inspection
• Whether the issue occurred while driving, parking, positioning, or exposing
• Brake behavior: stuck, dragging, not holding, or normal
• Drive behavior: no assist, jerking, one-direction fault, or intermittent
• Column movement behavior
• Arm/tube head lock and drift behavior
• Any warning or interlock messages
• Wheel/caster condition
• Evidence of impact or physical damage
• Whether restart cleared the fault
• Final device status

Final Thought

Mobile X-ray movement and positioning faults should be handled carefully because they involve both patient safety and staff safety. Start with the obvious external causes: obstructions, battery condition, brakes, wheels, parking position, and visible damage. If the unit does not move, stop, lock, or hold position predictably, escalation is the correct decision. Clear CCR documentation protects the patient, the technician, and the repair process.

That is successful troubleshooting.