Ambco 650AB
Ambco · Model 650AB
Portable, light weight. Easy to use tone switch. Tone present indicator. Plug-in 110 or 220 volt, 650A. Plug-in and battery, 650AB. Battery life indicator. Extremely accurate. Exceeds all specifications. Steady and pulsed tone. Custom carrying bag. Patient response.
Key tips
- ·Electrode impedance drives data quality more than almost any other single factor - check it before assuming an amplifier fault.
- ·Pre-case verification of intraoperative monitoring equipment isn't optional - a mid-case failure has direct surgical-decision consequences.
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.
Output level / calibration drift
HighSymptoms: Fails the annual / biological calibration check, levels perceived too loud or soft, channel imbalance.
Root cause: Transducer (headphone / insert / bone) ageing or damage, or electronics drift - needs calibration to the standard.
Transducer / probe fault
MediumSymptoms: No or intermittent tone in one side, rattling, no probe seal (tymp / OAE), probe-check fails.
Root cause: Worn headphone / insert / bone transducer, or a blocked / damaged probe tip.
Pump / pressure fault (tympanometry)
MediumSymptoms: Cannot achieve or hold pressure, pump noisy, flat / no tympanogram.
Root cause: Air-pump wear or a leak in the probe / tubing.
Patient-response / talkback fault
LowSymptoms: Response button not registering, no talk-forward / talk-back audio.
Root cause: Response switch, the talkback mic, or the audio path.
PC / printer / database fault
LowSymptoms: Results will not save, print or transfer to NOAH / the EMR.
Root cause: PC, printer, or the interface.
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.
Headphone / insert / bone transducer set
Recalibrate the audiometer to the transducer after replacement.
Class Periodic replacementRel. cost $$$R&R Fairly easy
Tymp / OAE probe & tips
Class Frequent wear itemRel. cost $$R&R Fairly easy
Air pump (tympanometry)
Class Periodic replacementRel. cost $$R&R Moderate
Patient response switch
Class Periodic replacementRel. cost $R&R Easy
Annual calibration to standard
Class Frequent wear itemRel. cost $$R&R Easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Headphone / insert / bone transducer set Recalibrate the audiometer to the transducer after replacement. | Periodic replacement | $$$ | Fairly easy |
| Tymp / OAE probe & tips | Frequent wear item | $$ | Fairly easy |
| Air pump (tympanometry) | Periodic replacement | $$ | Moderate |
| Patient response switch | Periodic replacement | $ | Easy |
| Annual calibration to standard | Frequent wear item | $$ | Easy |
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.
- ·Electrode / lead impedance check
- ·Amplifier calibration
- ·Annual electrical safety test
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: Calibration or level concern
- Do a listening / biological check on a known-normal ear.
- Confirm the correct transducer is paired and its calibration is current.
- Compare left / right and air / bone balance.
- Send the unit for calibration to the audiometric standard if it fails the check.
- Keep the calibration certificate with the device.
Symptom: No tone or no probe seal
- Swap the transducer / probe and cable.
- Clear or replace the probe tip and check the tubing for blockage.
- For tympanometry, leak-test the probe and pump.
- Run the probe-check / self-test.
- Replace the transducer, probe or pump as isolated.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Neurology / EEG lab
- ICU (continuous EEG monitoring)
- Operating Room (intraoperative monitoring)
Documents & Manuals
No documents available for this device yet.
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