On this page
Asset Type
Manufacturer
Model
What This Guide Helps With
Troubleshooting rack transfer, sampler, workcell transport, positioning, or handoff errors caused by external or user-accessible issues.
Step-by-Step Troubleshooting
Ensure Patient Safety First
Confirm the DxU Iris Workcell is not actively processing patient urine specimens before touching racks, transport paths, covers, or sampler areas.
If testing must continue, have laboratory staff use another validated analyzer or follow the approved downtime process.
Expected outcome: No specimen is interrupted, lost, misidentified, or reported from a workcell with an unresolved transport issue.
If this resolves the immediate safety concern, continue only when the system is safe to inspect.
Stop Additional Rack Loading
Ask staff not to load additional racks until the rack transfer issue is understood.
Confirm whether any specimens were in process when the error occurred and whether results were completed, aborted, held, or need repeat testing per lab policy.
Expected outcome: Incomplete or questionable urine results are not released.
Confirm the Exact Transport Complaint
Ask staff what they observed.
Check whether the issue involves:
- Rack not advancing
- Rack stopped between modules
- Rack stuck at the load or unload area
- Rack transfer arm or pusher not moving
- Rack detected in the wrong position
- Rack barcode read failure causing transport delay
- Analyzer waiting for rack handoff
- Rack collision, skewing, or misalignment
- Repeated transport error at the same location
- Intermittent workcell communication or timing error between connected modules
Expected outcome: The issue is narrowed to a rack, path obstruction, sensor detection, module handoff, barcode, or workcell communication problem.
Inspect for Obvious Rack or Specimen Problems
Verify the rack is the correct type for the workcell and is not cracked, warped, contaminated, or overloaded.
Check that sample tubes are seated properly, capped or uncapped as required by lab procedure, and not leaning out of position.
Expected outcome: The rack and specimens move freely without striking covers, guides, or transfer points.
If a damaged rack or poorly seated tube caused the problem, remove it, have staff reload specimens correctly, clear the error, and stop.
Check for Physical Obstructions
With the system stopped and safe, inspect the load area, transfer path, module handoff points, and unload area for:
- Loose caps
- Labels
- Broken tube fragments
- Spilled urine
- Paper debris
- Misplaced racks
- Cleaning materials
- Objects near the rack path
Expected outcome: The transport path is clear and racks can travel without obstruction.
If debris or a misplaced item caused the issue, remove it safely, clean any contamination per lab policy, clear the error, and stop.
Look for Specimen Tube Label Interference
Check whether barcode labels are peeling, wrinkled, doubled over, or extending beyond the tube surface.
A label that catches on rack guides or affects barcode readability can appear as a transport or rack positioning issue.
Expected outcome: Tubes sit straight in the rack and labels do not interfere with rack movement or identification.
If label interference caused the fault, have staff relabel or reload the specimen according to lab policy, then retest workflow.
Verify Rack Alignment at Entry and Handoff Points
Confirm racks are inserted squarely and seated properly at the load area.
Check for racks angled against the guide rails, partially inserted, or stacked incorrectly.
Expected outcome: The rack reaches the expected start position and can be detected by the workcell.
If poor loading caused the issue, reload the rack correctly, clear the error, and stop.
Check Doors, Covers, and Interlocks
Verify all covers, doors, and access panels near the transport path are fully closed and seated.
A slightly open cover may stop transport movement or prevent the system from resuming after a rack transfer error.
Expected outcome: The analyzer recognizes all access points as closed and allows transport operation.
If reseating a cover resolves the fault, document the finding and stop.
Inspect for Spills or Contamination in the Transport Area
Look for urine, crystallized residue, dried fluid, or sticky contamination around rack guides, transfer surfaces, and sensors visible from the user-accessible areas.
Do not perform deep disassembly or internal cleaning beyond approved external access.
Expected outcome: Rack movement surfaces are clean, dry, and free of residue that could slow or block movement.
If external contamination is found, have the area cleaned according to facility and manufacturer-approved cleaning practices, then verify transport operation.
Confirm Waste, Fluids, and System Readiness
Check whether any system readiness condition is preventing rack movement, such as full waste, low reagent, maintenance lockout, pending rinse, module not ready, or an analyzer in standby/error state.
A workcell may stop rack transfer if one connected module cannot accept the next rack.
Expected outcome: All connected modules are ready to receive racks.
If a readiness issue is corrected and transport resumes normally, document and stop.
Check Barcode Reader Area if Rack ID or Sample ID Is Involved
If the error occurs at or near identification, inspect the barcode window or scanner area for dirt, obstruction, or misaligned labels.
Confirm whether the issue follows one rack, one tube, or all racks.
Expected outcome: Barcode reading is not preventing rack routing or transfer.
If one specimen or rack label caused the issue, have staff correct the label or process the specimen per lab policy and stop.
Restart Only When Safe and Appropriate
If the system is idle and no patient specimens are at risk, perform a controlled restart or reset according to site procedure and operator guidance.
Do not repeatedly power cycle the workcell if the transport error returns.
Expected outcome: A temporary software or position-state fault clears and the workcell returns to ready status.
If the error clears and a test rack transfers normally, return the device to service after confirming with lab staff.
Run a Controlled Transport Check
Using an empty rack or approved test workflow, have staff verify rack loading, transfer, handoff, and unloading through the affected area.
Observe for hesitation, slipping, abnormal noise, repeated stopping, or rack skewing.
Expected outcome: Rack movement is smooth and repeatable without errors.
If transport passes and staff confirm normal operation, document the resolution and stop.
Evaluate for Repeated or Location-Specific Failure
If the rack stops at the same point repeatedly, note the exact location and any related error message.
Repeated failure at one handoff point may indicate a sensor, motor, belt, alignment, or module communication issue.
Expected outcome: Clinical Engineering has enough information to escalate intelligently without guessing.
Do not attempt internal sensor alignment, motor service, belt replacement, or board-level repair unless trained and authorized.
If the Problem Persists
If the rack transfer or workcell transport error continues after checking racks, tube seating, labels, obstructions, covers, contamination, barcode conditions, module readiness, and safe restart, common external causes have been ruled out.
The issue is likely related to an internal transport mechanism, sensor, alignment point, motor drive, module handoff, or workcell communication problem.
Remove the DxU Iris Workcell from service, label it Out of Service, and send it for repair, vendor support, or bench evaluation according to facility procedure.
Knowing when to stop is proper troubleshooting. Repeated attempts to force rack movement can damage specimens, racks, transport hardware, or result integrity.
Clinical Use Tip
Do not troubleshoot rack transfer errors while patient specimens are actively moving through the workcell. Stop the workflow safely, protect specimen integrity, and have the lab use another validated analyzer or downtime process if testing must continue.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Laboratory reported the Beckman Coulter DxU Iris Workcell stopped during rack transfer and would not advance racks to the next module."
Cause
What was observed during troubleshooting.
Example:
"Found a urine specimen tube sitting high in the rack with a peeling barcode label contacting the rack guide."
Resolution
What action was taken.
Example:
"Removed the affected rack from service, had lab staff reseat and relabel the specimen per lab policy, cleared the transport error, and verified normal rack transfer with a test rack."
Helpful Details to Include (If Known)
- Outlet tested
- Power status of each connected module
- Exact rack transfer error or on-screen message
- Rack location when fault occurred
- Whether one rack or all racks were affected
- Whether the issue followed a specific rack or tube
- Tube seating checked
- Barcode labels inspected
- Obstructions removed
- Covers and interlocks checked
- Spills or residue observed
- Unusual grinding, clicking, or motor noise
- Module readiness status
- Controlled restart performed
- Test rack transfer result
- Final device status
Final Thought
Rack transfer troubleshooting should be logical and safety-focused. Start with the rack, tubes, labels, covers, obstructions, contamination, and system readiness before suspecting internal transport failure. If the workcell continues to fault after external causes are ruled out, remove it from service and escalate. Clear CCR documentation helps protect patient results and gives repair personnel the details needed to resolve the issue efficiently.
That is successful troubleshooting.