DRE AT4 Series
DRE · Model AT4 Series
Unique IVRA (Biers Block) procedural guidance safety mechanism Routine automatic diagnostic self-checks at start-up and at regular intervals during use Precise regulators provide accurate pressure control at the touch of a button OLED display panel shows both pre-selected and real-time cuff pressure readings Audible and visual warnings alert in case of low battery, leaks and calibration Streamlined design for easy cleaning and mobile maneuvering Convenient on-board cuff hooks and quick-release cord management Single or dual channel operation for a variety of procedures Simple color-coded interface for controls, hoses and cuffs Cuffs deflate at a staggered rate to prevent patient discomfort Automatic timers with operator-set elapsed time alarm.
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.
Will not reach or hold set cuff pressure
HighSymptoms: Pressure droops during a case, will not inflate to setpoint, leak alarm.
Root cause: Internal pump / compressor wear, a solenoid-valve fault, or a leak in the tubing / cuff / connectors.
Pressure inaccuracy / calibration drift
HighSymptoms: Displayed pressure differs from an independent gauge - patient-safety critical.
Root cause: Pressure-transducer drift or a calibration fault.
Dual-channel / bilateral fault
MediumSymptoms: One channel will not regulate independently, cross-talk between channels.
Root cause: Channel solenoid / transducer or a manifold fault.
Alarm / timer fault
MediumSymptoms: Inflation-time alarm not sounding, timer wrong.
Root cause: Alarm / timer board fault - a safety function.
Tubing / connector / cuff fault
MediumSymptoms: Leak at the connector, cuff will not hold.
Root cause: Worn tubing, connectors, or a damaged cuff.
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.
Internal pump / compressor
Class Major service partRel. cost $$$R&R Difficult
Solenoid / regulator valve
Class Major service partRel. cost $$R&R Moderate
Pressure transducer
Verify against a calibrated gauge after replacement.
Class Periodic replacementRel. cost $$R&R Moderate
Connecting tubing / connectors
Class Frequent wear itemRel. cost $R&R Easy
Alarm / control board
Class Major service partRel. cost $$R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Internal pump / compressor | Major service part | $$$ | Difficult |
| Solenoid / regulator valve | Major service part | $$ | Moderate |
| Pressure transducer Verify against a calibrated gauge after replacement. | Periodic replacement | $$ | Moderate |
| Connecting tubing / connectors | Frequent wear item | $ | Easy |
| Alarm / control board | Major service part | $$ | Moderate |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
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 or low RF output / high-impedance cut-out
- Confirm good electrode-tissue contact and an adequately wetted field.
- Inspect the handpiece / instrument and its cable for damage; substitute a known-good one.
- Check the split dispersive (return) pad is well applied over well-perfused muscle with a sound cable.
- Verify output into a resistive test load with an electrosurgical analyser.
- Replace the RF output board and recalibrate on a non-conductive surface if output is confirmed absent (anti-static handling).
Symptom: Return-electrode (REM / NESSY / CQM) contact-quality alarm
- Re-apply a fresh split dispersive pad with full skin contact.
- Check the pad cable and its connector.
- Try a known-good pad.
- Run the contact-quality-monitor calibration with a good pad fitted.
- Refer the CQM circuit if it still alarms.
Symptom: Output will not activate from the footswitch or handswitch
- Test the other activation method to isolate the pedal from the handpiece.
- Inspect the footswitch and its cable / connector for damage or moisture.
- Check the handswitch leads on the handpiece.
- Substitute a known-good footswitch.
- Refer the activation input board if both methods fail.
Symptom: Fails calibration / output drifts after a repair
- Verify cut and coag output at several settings into a test load with an analyser.
- Verify the REM / CQM circuit against its spec.
- Recalibrate per the service manual on a non-conductive bench with anti-static precautions.
- Check the cooling fan and thermal path.
- Re-verify all outputs and the REM alarm before returning to service.
Technical Specs
- Height
- 1050
- Length
- 385
- Weight
- 17.3 kg
- Width
- 305
Documents & Manuals
Troubleshoot this device with Bio
Describe a symptom or error code. Bio answers from this device's own documented error codes, failure modes, parts, and guides.
Ask Bio