Midmark 623
Midmark · Model 623
Power height and back. Hand and foot control. Receptacle and rear storage pod.
Key tips
- ·When no category-specific guidance fits, default to the manufacturer's own service manual and the general troubleshooting method in the Engineer's Guide.
- ·Run an incoming and annual electrical safety test regardless of how niche the device is.
Typical Failure Modes
Compiled for this model from its own documentation and established engineering knowledge for this equipment class - not from a verified service record. Confirm against the manufacturer's service manual.
Base Up/Down will not operate
HighSymptoms: No base movement from the foot or hand control.
Root cause: Base up/down limit switch tripped, blown primary/transformer/base-motor fuse, base actuator, or control fault.
Power back will not run or hold
MediumSymptoms: Backrest will not raise/lower or drifts.
Root cause: Back actuator or its limit switch/relay.
Moves the wrong direction / noisy / slow
MediumSymptoms: Reversed function, rumble, sluggish travel.
Root cause: Wiring/capacitor fault, worn actuator, or dry mechanism.
Hand or foot control unresponsive
MediumSymptoms: One control dead, intermittent response.
Root cause: Control cable or contacts, or fluid ingress.
Serviceable Parts & Consumables
Serviceable items for this model, compiled from its documentation and engineering knowledge for this equipment class. Service class and relative cost are estimates, not manufacturer figures; no part numbers are given. Confirm intervals and pricing against the manufacturer.
Base actuator
Class Major service partRel. cost $$$R&R Moderate
Back actuator
Class Major service partRel. cost $$$R&R Moderate
Hand / foot control
Class Periodic replacementRel. cost $$R&R Fairly easy
Primary / transformer / base-motor fuses
Class Major service partRel. cost $R&R Fairly easy
Limit switch (base / back)
Class Major service partRel. cost $R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Base actuator | Major service part | $$$ | Moderate |
| Back actuator | Major service part | $$$ | Moderate |
| Hand / foot control | Periodic replacement | $$ | Fairly easy |
| Primary / transformer / base-motor fuses | Major service part | $ | Fairly easy |
| Limit switch (base / back) | Major service part | $ | Moderate |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Follow the manufacturer's PM schedule
- ·Perform incoming and annual electrical safety testing per facility biomedical program
Troubleshooting Approach
A starting sequence for this model, compiled from its documentation and engineering knowledge for this equipment class. Follow the manufacturer's service documentation for the actual procedure.
Symptom: No base Up or Down
- Check the primary, transformer and base-motor fuses.
- Confirm neither base limit switch is tripped.
- Test with a known-good hand or foot control.
- Trace current flow per the Base Up/Down diagram.
- Replace the actuator if power reaches it but it will not run.
Symptom: A control is unresponsive
- Swap the hand and foot control roles to isolate the faulty one.
- Inspect the cable and connector for damage or fluid ingress.
- Test switch continuity.
- Replace the control.
- Confirm all functions from both controls.
Technical Specs
- Height
- 18 to 37 inches
- Length
- 56 in
- Patient Weight Capacity
- 400 lbs
- Width
- 28 in
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Varies by device - check the unit's own manual for facility placement guidance
Documents & Manuals
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