Canon TX-F
Canon · Model TX-F
Non-contact tonometer This instrument uses a gentle puff of air to make intraocular pressure measurements easier and more comfortable than ever before. This test is important in evaluating ocular conditions that affect the pressure inside of an eye such as glaucoma.
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.
Illumination lamp failure or dim / uneven slit
HighSymptoms: No or dim slit, uneven illumination, colour shift.
Root cause: LED or halogen source at end of life, a driver fault, or a rheostat fault.
Slit / aperture / filter mechanism fault
MediumSymptoms: Slit width, length, angle or filter selection will not change or sticks.
Root cause: Worn slit mechanism or filter turret.
Joystick / base motion fault
MediumSymptoms: Coarse or fine movement binds, drifts, or the locking screw is ineffective.
Root cause: Dry or worn base slide / bearings, or a loose locking screw.
Optics contamination
LowSymptoms: Haze, spots, or reduced image quality through the oculars.
Root cause: Dust or fingerprints on the objective, oculars, or mirrors.
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.
Illumination source (LED / halogen)
Class Periodic replacementRel. cost $$R&R Fairly easy
Rheostat / illumination driver
Class Major service partRel. cost $$R&R Moderate
Slit mechanism / filter turret
Class Major service partRel. cost $$$R&R Difficult
Base-slide bearings / glide plate
Class Major service partRel. cost $$R&R Moderate
Mains fuse
Class Major service partRel. cost $R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Illumination source (LED / halogen) | Periodic replacement | $$ | Fairly easy |
| Rheostat / illumination driver | Major service part | $$ | Moderate |
| Slit mechanism / filter turret | Major service part | $$$ | Difficult |
| Base-slide bearings / glide plate | Major service part | $$ | Moderate |
| Mains fuse | Major service part | $ | Fairly 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 dim slit
- Replace the illumination source and check its connections.
- Operate the rheostat through its range for a dead spot.
- Check the driver output and the mains fuse (unplug first).
- Confirm even slit illumination at full and low intensity.
- Clean the projection optics and mirror.
Symptom: Base or joystick motion binds
- Confirm the locking screw is released.
- Clean the base glide plate and lightly lubricate per the manual.
- Check the bearings / slide for wear or debris.
- Replace worn base-slide bearings.
- Confirm smooth coarse and fine movement and a firm lock.
Documents & Manuals
No documents available for this device yet.
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