On this page
Asset Type
Manufacturer
Model
Models Covered
Midmark 630 HumanForm Procedure Chair (-010 through -013 and -020 through -023) and Midmark 641 Power Procedures Chair.
Manual Reference
Midmark 630 HumanForm Procedures Chair User Guide 003-10431-99; Midmark 641 User Guide 003-1709-99; Midmark 641 Scheduled Maintenance 641-SR-00043; and applicable Midmark service information for the exact model, serial range, controls, accessories, and electrical configuration.
Manufacturer Recommendation / AEM Status
Midmark 630
- Weekly: Wash upholstery with mild liquid soap/water, rinse with clear water, and dry completely. Clean painted metal and plastic using a soft cloth and mild cleaner.
- Periodically: Inspect power cords, fasteners, and all mechanical functions.
- Every 12 months: Have a qualified service technician inspect the equipment.
Midmark 641
- Weekly: Clean upholstery with the manufacturer-listed 10:1 water-to-bleach solution; clean painted metal/plastic and inspect for obvious damage.
- Semiannually: Check mechanical functions using foot and available hand controls; inspect shroud movement/plastic glides, labels, hardware, cord, wiring, and electrical connections.
Apply the exact model's schedule; do not merge the intervals. For 630 upholstery, permitted bleach/chlorine cleaning must be followed by clear-water rinsing and thorough drying. Do not allow disinfectant to pool. Any change to manufacturer-listed activities or intervals belongs under the facility's approved AEM program, risk assessment, maintenance history, and applicable regulatory requirements.
What This PM Procedure Covers
- Exact model, suffix, serial range, configuration, controls, options, and history
- Upholstery, frame, shrouds, fasteners, labels, cord, wiring, base, and accessories
- Base, back, tilt, and foot movement as fitted
- Hand/foot/wireless controls, programmed positions, rotational base, receptacles, and safety functions when fitted
- Model-specific scheduling and electrical safety documentation
Required Tools and Equipment
- Current Midmark user/service information for the exact chair and serial range
- Soft cloths, mild soap/cleaner, clear rinse water, and upholstery-compatible disinfectant
- Authorized basic hand tools for inspection/tightening
- AA batteries for applicable 630 wireless controls when needed
- Calibrated electrical safety analyzer suitable for grounded equipment and auxiliary receptacles when fitted
- Facility-required PPE
Step-by-Step PM Procedure
1. Verify Identification and Configuration
Action: Record asset tag, serial, exact model/suffix, voltage/frequency, location, upholstery, and options. Identify wired/wireless controls, programming, rotational base, receptacles, isolation transformer, casters, rails, armboards, headrest, tray, IV pole, and other accessories.
Expected outcome: Identity and configuration match CMMS and the correct Midmark documentation.
2. Review History
Action: Review unintended movement, drift, binding, noise, slow/failed functions, control problems, impacts, loose accessories, receptacle/electrical complaints, errors, repairs, and cleaning damage.
Expected outcome: Safety-related conditions are identified. Unintended movement or unstable support remains out of service until resolved.
3. Prepare for Safe Inspection
Action: Remove from patient use; clear the entire movement envelope; secure accessories; lower when practical; disconnect mains power for static inspection; follow lockout/tagout before service access. Avoid pinch zones and unsupported sections.
Expected outcome: Inspection can proceed without patient, collision, pinch, crush, or electrical exposure.
4. Inspect Installation, Base, and Frame
Action: Inspect floor/support, casters/levelers, base, rotational components, frame, covers, shrouds, pivots, hardware, and mounts for cracks, bending, corrosion, missing/loose fasteners, impact, instability, interference, or fluid.
Expected outcome: Chair is stable and structurally intact with covers and hardware secure.
5. Inspect Upholstery and Clean
Action: Inspect upholstery, seams, fasteners, headrest, arms, and surfaces for tears, punctures, fluid, looseness, staining, or deterioration. Perform due model-specific cleaning. Rinse with clear water and dry completely after contact time; do not allow pooling.
Expected outcome: Upholstery and surfaces are clean, dry, secure, and serviceable.
6. Inspect Labels, Cords, and Wiring
Action: Verify safety, operation, rating, model, and serial labels. Inspect cord(s), plug, ground pin, strain relief, accessible wiring, control cables, and connectors for cuts, crushing, fraying, heat, contamination, looseness, or exposed conductors.
Expected outcome: Labels are legible and electrical/control paths are secure and undamaged.
7. Inspect Controls
Action: Inspect hand/foot controls, switches, membranes, housings, cords, batteries, and storage. On 630 wireless controls, verify association and response; replace AA batteries if low. Clear the area before movement.
Expected outcome: Controls are intact, labeled, stored securely, and command only the intended chair.
8. Verify Base Movement
Action: Reconnect power and operate base through its range with the foot control, then hand control when present. Observe smoothness, speed, noise, shrouds, clearances, and stop response. For 641, verify shroud-tab plastic glides and smooth/quiet shroud travel.
Expected outcome: Base moves smoothly, stops on command, holds without drift, and has no binding, collision, or abnormal noise.
9. Verify Back, Tilt, and Foot Functions
Action: Operate each fitted powered function through its range using every applicable control. Check pivots, supports, upholstery clearance, coupling, and limit behavior. Do not adjust individual limit switches unless directed by the exact service procedure.
Expected outcome: Functions move smoothly, stop correctly, hold without drift, and avoid interference.
10. Verify Manual Sections and Accessories
Action: Exercise headrests, armboards, extensions, rails, paper holder, locking knobs, and other adjustable supports. Confirm secure locking without excess looseness or unexpected release.
Expected outcome: Patient supports and accessories remain secure in intended positions.
11. Verify Programmed Positions When Fitted
Action: Test Home/Return and stored positions using normal controls. Confirm controlled travel, repeatability, and stop response. Do not perform service calibration unless required after repair, by an error, or by the applicable service procedure.
Expected outcome: Programmed positions operate consistently without unintended travel or collision.
12. Verify Rotational Base When Fitted
Action: Release, rotate, and re-lock using the user procedure. Check smooth travel, brake/lock engagement, stability, and cord/equipment clearance.
Expected outcome: Base rotates smoothly when released and locks securely without drift.
13. Verify Safety and Stop Functions
Action: Confirm movement stops when controls are released and the Stop function works when fitted. Test accessible shroud/obstruction safety only by the approved method; never use body parts in a pinch zone.
Expected outcome: Motion stops predictably and applicable safety functions work without bypass.
14. Inspect Receptacles and Isolation Features When Fitted
Action: Inspect receptacles, covers, markings, ground contacts, and accessory cords. Verify rated configuration using applicable Midmark information. Functionally test isolation transformer/ground monitor when installed. Do not exceed ratings.
Expected outcome: Receptacles and isolation/ground-monitor features are intact and pass applicable checks.
15. Complete Model-Specific Schedule
Action: For 630, document weekly cleaning, periodic cord/fastener/mechanical inspection, and qualified inspection every 12 months. For 641, document weekly cleaning/damage inspection and semiannual mechanical, shroud/glide, label, hardware, cord, wiring, and connection checks.
Expected outcome: All manufacturer-listed tasks due for the exact model are complete and traceable.
16. Perform Electrical Safety Testing
Action: Test under the facility's approved program. Record analyzer, standard, configuration, ground resistance, and touch/chassis leakage. Test auxiliary receptacles, isolation transformer, and ground monitor separately when fitted and required.
Expected outcome: Protective grounding, leakage, and installed electrical options meet approved limits.
17. Final Verification
Action: Restore accessories/controls, remove tools, route cords safely, and run every applicable movement again. Confirm covers, control storage, programmed positions, rotation lock, supports, and receptacles are restored. Apply PM label and document status.
Expected outcome: Chair is clean, stable, electrically safe, fully functional, and ready for service.
Electrical Safety Testing
The 630 and 641 are grounded mains-powered chairs. Configurations may include receptacles, isolation transformers, or ground monitors; verify exact options before testing.
Ground resistance measured in ohms, expected ≤ 0.5 Ω or facility/NFPA 99 criteria if different:
Result =
Touch/chassis leakage measured in microamps:
Facility limit used =
Result =
Pass / Fail =
Auxiliary receptacle/isolation transformer/ground monitor, if fitted:
Applicable procedure/limit =
Result =
Pass / Fail =
The reviewed user maintenance information does not provide one universal leakage limit for every configuration. Apply current facility/NFPA 99 criteria and applicable Midmark procedures.
Pass / Fail Criteria
Pass
- Exact model, suffix, serial range, controls, and options are verified
- Due model-specific cleaning and inspection are complete
- Upholstery, frame, base, covers, shrouds/glides, labels, cord, controls, fasteners, and accessories pass
- Powered/manual/programmed/rotational functions operate smoothly, stop correctly, and hold without drift
- Supports and accessories adjust and lock securely
- No unintended movement, binding, collision, noise, exposed wiring, or unresolved fault remains
- Installed receptacle/isolation/ground-monitor features and electrical safety pass
Remove From Service
- Structural damage, instability, loose/missing critical hardware, or unsafe upholstery/support damage
- Any section moves unexpectedly, drifts, binds, collides, fails to stop, or fails to hold
- A support, rotational brake, control, shroud/glide, limit/safety function, or required accessory fails
- Cord, plug, ground pin, wiring, receptacle, isolation transformer, or ground monitor is damaged or fails
- Electrical safety fails
- Service calibration, actuator/limit adjustment, internal repair, or other qualified service is required
Copy/Paste CMMS Work Order Procedure
Use the manufacturer service manual, facility policy, and approved AEM program to determine the final PM interval and return-to-service requirements.