Summit Doppler 3 MHz Obstetrical Probe
Summit Doppler · Model 3 MHz Obstetrical Probe
The Summit Doppler 3 MHz Obstetrical Probe is optimized for early fetal heart detection and designed for use during the entire pregnancy. The LifeDop SD3 Obstetrical Probe is specifically designed to provide excellent sensitivity and maximum durability. The non-directional probe is completely interchangeable for use on the L150, L250, and L350 series of dopplers, offering the convenience of choosing one or all Summit Doppler probes for use on the same unit. The probe uses a standard phone cord. The Doppler-probe connection can deteriorate over time but with this probe, the customer can replace the cable with any phone cord to avoid timely and costly repair. The durable plastic housing helps to eliminate the crystal cracking from accidental drops. Superior sound quality is produced using custom chip technology, minimizing static often heard with traditional probes.
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.
No or weak Doppler audio
HighSymptoms: No fetal heart tones, faint or intermittent signal even with good gel and placement.
Root cause: Degraded or cracked transducer crystal, or insufficient coupling gel.
Intermittent signal with cable movement
MediumSymptoms: Audio cuts out when the probe cable or strain relief is flexed.
Root cause: Broken conductors in the probe cable.
Connector fault / probe not detected
MediumSymptoms: The Doppler unit does not recognise the probe or gives static.
Root cause: Worn or dirty probe connector.
Cracked probe face / water ingress
LowSymptoms: Visible crack, loss of signal (waterproof probe compromised).
Root cause: Drop or impact.
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.
Doppler probe (replaced as a unit)
Class Periodic replacementRel. cost $$R&R Easy
Probe cable / connector
Class Periodic replacementRel. cost $$R&R Fairly easy
Ultrasound coupling gel
Class Frequent wear itemRel. cost $R&R Easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Doppler probe (replaced as a unit) | Periodic replacement | $$ | Easy |
| Probe cable / connector | Periodic replacement | $$ | Fairly easy |
| Ultrasound coupling gel | Frequent wear item | $ | Easy |
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 weak fetal tones
- Apply fresh coupling gel and confirm probe placement.
- Test the probe on a known-working Doppler unit.
- Flex the cable while listening for dropouts.
- Inspect the probe face for cracks.
- Replace the probe if a known-good unit still gives no signal.
Symptom: Signal cuts out with cable movement
- Flex the cable along its length and at both ends.
- Inspect the connector for bent pins or corrosion.
- Clean and reseat the connector.
- Replace the probe if the fault tracks the cable.
- Confirm a stable signal with the cable moved.