A dec 400 Dental Chair
A dec · Model 400 Dental Chair
Ultra-thin backrest that "flexes" (1", 25 mm). Enables you to tuck your knees under the chair providing ergonomic access to the oral cavity. Double-articulating gliding headrests. Adjusts easily for optimal patient positioning. Available in locking knob and lever release styles. Full height range. Offers a range from 13.75" to 31.25" (349 mm to 794 mm). Low point 14.75" (375 mm) with dual mounting. 2-position armrests. Combines comfortable arm/elbow support with a robust load-bearing design for easy patient entry and exit. 60º swivel with brake. Allows 30º rotation on each side of center. Hybrid chair lift system. Combines the power of a hydraulic base and the smoothness of an electro-mechanical tilt, allowing simultaneous movement for quicker patient positioning. Integrated 300-watt power supply. Provides more than enough power for the whole system; powers light and additional ancillary devices.
Key tips
- ·Biological-indicator verification applies to dental sterilizers exactly the same as hospital CSSD - no exception for smaller units.
- ·"Sounds different" is often the first real report of handpiece bearing wear, not an outright failure - investigate early rather than waiting.
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.
Motor / actuator / drive will not run or is weak
HighSymptoms: Traction force not applied, CPM carriage will not move or stalls, drive assist weak, motion one direction only.
Root cause: Worn drive motor / leadscrew / actuator, a hand-control fault, or a control-board fault.
Force / range / position inaccuracy
MediumSymptoms: Set traction force or CPM angle not reached, load cell drifts, carriage overshoots or stalls short.
Root cause: Load-cell / position-sensor drift, a potentiometer fault, or a limit-switch fault.
Hand control / patient-control fault
MediumSymptoms: Hand control unresponsive, the patient stop / reverse button does not work.
Root cause: Worn hand control or a damaged cable.
Frame / bearing / cable wear
MediumSymptoms: Rough or noisy travel, play in the carriage, frayed traction cord or rope.
Root cause: Worn bearings / slides or a frayed cable / cord.
Power / battery fault
LowSymptoms: Will not power on, short battery run time.
Root cause: Power supply / fuse or an aged battery.
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.
Drive motor / leadscrew / actuator
Class Major service partRel. cost $$$R&R Difficult
Load cell / position sensor / potentiometer
Class Major service partRel. cost $$R&R Moderate
Hand control
Class Periodic replacementRel. cost $$R&R Fairly easy
Bearings / slides / traction cord
Class Periodic replacementRel. cost $$R&R Moderate
Power supply / fuse / battery
Class Major service partRel. cost $R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Drive motor / leadscrew / actuator | Major service part | $$$ | Difficult |
| Load cell / position sensor / potentiometer | Major service part | $$ | Moderate |
| Hand control | Periodic replacement | $$ | Fairly easy |
| Bearings / slides / traction cord | Periodic replacement | $$ | Moderate |
| Power supply / fuse / battery | 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.
- ·Daily handpiece lubrication and autoclave cycle verification
- ·Compressor moisture-trap draining
- ·Annual full PM
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: Motor / actuator will not run
- Confirm mains / battery and that any e-stop / patient stop is released.
- Try the hand control and, if fitted, the unit buttons to isolate the control.
- Listen for the drive motor and check the leadscrew is not jammed.
- Replace the hand control, motor or control board as isolated.
- Verify the achieved force / range against a reference after repair.
Symptom: Force or range not reached
- Run the calibration / homing routine.
- Check the load-cell / position sensor and the limit switches.
- Verify with a known weight (traction) or a goniometer (CPM).
- Replace the sensor if it drifts.
- Re-verify and confirm the patient stop works.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Dental operatory
- Oral surgery suite
- CSSD (dental sterilizers)
Documents & Manuals
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