Gendex 765DC Dental X-Ray
Gendex · Model 765DC Dental X-Ray
21 time settings ranging from 0.02 to 2 seconds Digitally displayed time on the control panel 8" focal length with a 0.4mm focal spot Exposure Time: 0.02 to 2 sec. Intuitive control panel X-ray generator for dental diagnostics Smallest focal spot available on the market: 0.4 Can be switched to the pre-programmed mode Automatically identifies the correct exposure times depending on the anatomic area selected
Key tips
- ·Never bypass a radiation interlock to "just get the image" - this is one of the few true zero-tolerance rules in BMET work.
- ·Trend image-quality phantom results over time - drift shows up before an outright failure does.
- ·Portable/mobile units take real physical abuse from transport - check wheel locks and cable strain reliefs more often than fixed units.
Typical Failure Modes
Failure patterns typical of this equipment class - general BMET reference, not verified against this exact unit's own service history unless flagged. Severity is a category-level estimate.
Detector calibration drift
MediumSymptoms: Image noise, artifacts, low SNR.
Root cause: Flat-panel / sensor aging.
Cooling system fault
HighSymptoms: Tube temp alarm, duty-cycle limited.
Root cause: Pump/radiator or coolant loss.
Generator / high-voltage fault
HighSymptoms: Exposure fails, kV/mA out of range error.
Root cause: HV tank or generator board fault.
Recon / system software hang
LowSymptoms: Frozen console, acquisition timeout.
Root cause: Workstation or RAID degradation.
Serviceable Parts & Consumables
The parts a BMET typically services on this class of equipment. Service class and relative cost are general engineering estimates for the category, not figures from this unit's documentation. Part numbers appear only when pulled from this unit's own service manual. Always confirm intervals and pricing against the manufacturer.
Workstation RAID / GPU
Class Periodic replacementRel. cost $$$R&R Difficult
X-ray tube insert
Major R&R; track mAs history.
Class Major service partRel. cost $$$$R&R Expert-level
Flat-panel detector
Class Major service partRel. cost $$$$R&R Expert-level
Cooling pump & radiator
Class Periodic replacementRel. cost $$$R&R Difficult
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Workstation RAID / GPU | Periodic replacement | $$$ | Difficult |
| X-ray tube insert Major R&R; track mAs history. | Major service part | $$$$ | Expert-level |
| Flat-panel detector | Major service part | $$$$ | Expert-level |
| Cooling pump & radiator | Periodic replacement | $$$ | Difficult |
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 QC per modality: image-quality phantom test
- ·Tube and detector inspection
- ·Annual state-required radiation safety survey
- ·Vendor-scheduled preventive maintenance
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: X-ray tube overheating / filament failure
- Confirm the presentation - typically tube won't fire, heat-capacity alarm - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: filament wear, cooling failure.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the x-ray tube insert per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Symptom: Detector calibration drift
- Confirm the presentation - typically image noise, artifacts, low SNR - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: flat-panel / sensor aging.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the flat-panel detector per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Radiology / Imaging department
- Emergency Department (portable units)
- Operating Room (C-arms)
- Cath lab
- Bedside ICU (portable X-ray)
Documents & Manuals
Safety & Recalls
Synced live from the FDA openFDA API.
- RECALL
Two (2) failures of the spring link components within the articulated arm assembly. The spring links broke during normal assembly process for the articulated arm during first cycle of the arm, prior to the 14lb tube head (full load) being installed onto the assembled articulated arm.
- RECALL
Improper hardware was used during installation of the eXpert DC Intraoral X-Ray system units causing drifting of the tubehead assembly.
- RECALL
There is an anomaly in the Orthoralix firmware which can cause a message corruption which will distort the patient image being transferred from the X-Ray system to the PC. This image distortion/corruption (distorted, fragmented, flipped, negative, reversed or had lines across them) is most likely to occur during periods of high network traffic and is significant enough that it is clear and obviou
- RECALL
The Automatic Exposure Control (AEC) feature located on the control panel of the Orthoralix 8500 Panoramic Dental X-Ray System was functional, but was subsequently disabled in units manufactured starting 5/17/10. North American units manufactured between 12/4/09 and 5/16/10 had functioning AEC buttons, but their manuals stated they were disabled. Units intended for International distribution bet
- RECALL
The X-Ray unit may break loose from the mounting plate and fall off the wall due to defects in the mounting plate.
- RECALL
The intraoral x-ray systems were installed improperly with incorrect screws which allow the unit to pull away from the wall when the arm is fully extended. This condition may harm the patient.
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