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What This Guide Helps With
Troubleshooting Hana table movement failure caused by pendant, control box, power, connection, lockout, or actuator-related issues.
Step-by-Step Troubleshooting
Ensure Patient Safety First
If the Hana Orthopedic Surgery Table is in use with a patient, do not continue troubleshooting unless the patient is fully supported and clinical leadership confirms it is safe.
If movement is needed during a procedure and the table does not respond, notify the OR team immediately and follow facility procedure for patient support, transfer, or alternate positioning.
Expected outcome: Patient positioning remains stable and safe before any troubleshooting continues.
Why it matters: Surgical table movement failure can create immediate patient safety risks, especially during orthopedic positioning.
Confirm the Reported Movement Failure
Identify exactly what is not working:
- No movement from the pendant
- One specific movement does not work
- Multiple movements fail
- Table responds from one control source but not another
- Movement starts then stops
- Actuator makes noise but does not move
- No sound or response at all
Expected outcome: The failure is narrowed to a specific control path, movement function, or general power/control problem.
If the issue is confirmed and repeatable, continue troubleshooting.
Check for Obvious Physical Obstructions
Inspect around the table base, leg spars, traction components, accessory mounts, and patient support surfaces for anything blocking motion.
Remove any item that could mechanically restrict movement, including cords, OR drapes, accessory clamps, floor objects, or improperly positioned attachments.
Expected outcome: Table movement resumes if an external obstruction was preventing travel.
If this resolves the issue, stop and document the obstruction found.
Verify Table Power Status
Confirm the table is connected to appropriate facility power if required for the movement function being tested.
Check that the power cord is fully seated at the wall outlet and table power inlet, if applicable.
Verify that power indicators, control box lights, or display indicators are present.
Expected outcome: The table has confirmed power available for powered movement.
If power is restored and movement returns, stop and document the power issue.
Test the Wall Outlet
Plug a known-good electrical safety analyzer, outlet tester, or approved test device into the same outlet.
Confirm the outlet is energized and not controlled by a wall switch, emergency power transfer issue, tripped breaker, or failed receptacle.
Expected outcome: The outlet provides stable power.
If the outlet fails testing, remove the table from use until power is corrected or move the table to a verified outlet.
Check Battery or Charge Status, If Applicable
If the table uses battery-supported movement, check battery charge indicators or low-power messages.
Connect the table to AC power and allow charging per facility practice before retesting movement.
Expected outcome: Low battery or depleted charge is ruled out as the cause.
If movement returns after charging, document low battery or insufficient charge as the cause.
Inspect the Pendant for Damage
Examine the pendant for:
- Cracked housing
- Stuck buttons
- Fluid contamination
- Missing button covers
- Damaged cable strain relief
- Bent or loose connector pins
- Intermittent response when the cable is gently repositioned
Do not use excessive force on the connector or cable.
Expected outcome: The pendant is physically intact and not obviously damaged.
If the pendant is damaged, remove the table from service or replace the pendant if your department stocks approved replacement parts.
Reseat the Pendant Connection
Power the table down if safe and appropriate.
Disconnect and reconnect the pendant cable at the control box or table connection point. Make sure the connector is fully seated and properly aligned.
Retest the affected movement.
Expected outcome: Movement resumes if the issue was caused by a loose or poorly seated pendant connection.
If this resolves the issue, stop and document the loose pendant connection.
Check for Pendant Button Lockout or Control Mode Issue
Confirm that no control lockout, emergency stop, pendant disable setting, or alternate control mode is active.
Look for indicator lights, disabled movement functions, or button combinations that may prevent pendant control.
Expected outcome: The pendant is enabled and allowed to command table movement.
If control lockout was active and clearing it restores movement, stop and document the setting found.
Test Alternate Controls, If Available
If the Hana table has another approved control point, such as a control box interface or secondary control, test the same movement from that control.
Compare results:
- Works from alternate control but not pendant: suspect pendant, pendant cable, or pendant connection.
- Fails from all controls: suspect power, control box, actuator, limit switch, or internal control issue.
- Only one movement fails: suspect function-specific actuator, cable, limit, or mechanical issue.
Expected outcome: The problem is narrowed to either the pendant/control input path or the movement hardware path.
Inspect the Control Box Area
Visually inspect the control box and external cable connections for:
- Loose connectors
- Damaged cable jackets
- Pulled strain reliefs
- Fluid intrusion
- Cracked housing
- Burnt smell
- Unusual heat
- Missing or abnormal indicator lights
Do not open the control box or perform board-level troubleshooting.
Expected outcome: External control box condition is verified.
If there is heat, odor, fluid intrusion, or visible damage, remove the table from service immediately.
Check Emergency Stop or Safety Interlock Conditions
Confirm that any emergency stop, brake, lock, or safety interlock is not engaged.
Verify the table is not in a condition that intentionally prevents movement, such as an unsafe configuration, accessory conflict, or end-of-travel limit.
Expected outcome: Movement is not being blocked by a safety condition.
If clearing the safety condition restores movement, stop and document the interlock or configuration issue.
Listen for Actuator Response
While commanding the failed movement, listen for:
- No sound at all
- Relay click but no movement
- Motor/actuator noise without motion
- Grinding, binding, or clicking
- Movement that starts then stops
Expected outcome: The table response helps separate a control-command issue from a mechanical or actuator issue.
Why it matters: A silent actuator may indicate no command or no power to that function. A noisy actuator without movement may indicate binding, actuator failure, or mechanical load issue.
Check for Binding or Overload
Remove nonessential accessories if safe and clinically appropriate.
Confirm the table is not overloaded, unevenly loaded, or restricted by traction accessories, leg spars, boots, transfer boards, or floor contact.
Retest movement with no patient present and only approved minimum accessories installed.
Expected outcome: Movement resumes if the table was restricted by load, accessory position, or binding.
If the problem only occurs under load, remove the table from service for bench evaluation.
Test Other Movement Functions
Test other powered functions one at a time.
Determine whether the failure affects:
- One actuator only
- One direction only
- All powered functions
- Pendant control only
- Control box output generally
Expected outcome: The failure pattern is clearly identified for repair escalation.
If only one function fails and other movements work normally, suspect that movement’s actuator path, limit switch, wiring, or mechanical linkage.
Power Cycle the Table
If safe and no patient is on the table, power the table off, disconnect from AC power if applicable, wait briefly, reconnect power, and restart.
Retest the failed movement.
Expected outcome: Temporary control logic lockup is cleared.
If movement returns after power cycling, perform additional functional checks before returning the table to service. Document the reset behavior clearly.
Perform a Functional Safety Check
If the table movement returns, verify all required table movements operate smoothly and stop correctly.
Confirm the pendant responds consistently, the control box does not show abnormal indicators, and no movement is intermittent.
Expected outcome: The table operates normally and safely before return to service.
If any movement remains intermittent or unreliable, do not return the table to service.
If the Problem Persists
If common external causes have been ruled out, the issue is likely related to an internal control box fault, actuator failure, actuator wiring, limit switch issue, pendant electronics, or internal table control circuitry.
The Hana Orthopedic Surgery Table should be removed from service, labeled Out of Service, and sent for repair, vendor support, or bench evaluation.
Knowing when to stop is proper troubleshooting. A surgical table with unreliable movement should not be returned to the OR until the failed control or actuator condition is corrected and verified.
Clinical Use Tip
Do not troubleshoot table movement with an active patient positioned on the table unless the OR team confirms the patient is fully supported and it is safe to proceed. If movement is clinically required and the table is not responding, support or transfer the patient first and provide another surgical table or positioning plan when possible.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"OR staff reported the Mizuho OSI Hana Orthopedic Surgery Table would not move when commands were entered from the pendant."
Cause
What was observed during troubleshooting.
Example:
"Pendant connection was found partially seated at the control box, preventing reliable movement commands."
Resolution
What action was taken.
Example:
"Reseated pendant connector, verified pendant response, tested table movement functions, and returned the table to service after successful operational checks."
Helpful Details to Include (If Known)
- Whether the table was occupied or unloaded during troubleshooting
- Which movement failed
- Whether pendant buttons responded
- Whether alternate controls worked
- Outlet tested and power verified
- Battery or charge status, if applicable
- Pendant cable inspected and reseated
- Control box indicators observed
- Any abnormal sound from actuator
- Any binding, obstruction, or accessory interference found
- Any unusual heat, smell, fluid intrusion, or visible damage
- Final device status
Final Thought
Surgical table troubleshooting should begin with patient safety, then move through visible power, pendant, connection, obstruction, and control checks before suspecting internal failure. If movement remains unreliable after external causes are ruled out, escalation is the safest and most appropriate response. Clear CCR documentation protects the patient, the OR team, and Clinical Engineering.
That is successful troubleshooting.