UNICO M250
UNICO · Model M250
The Unico M250 Binocular Microscope is designed for College Level Instruction and Discovery. The M250 Series Microscopes have been recently updated with the Reverse Nosepiece, Larger Base and Sturdier Body Construction adding more value. All heads rotate 360. Binocular Heads have Diopter Control on One Eye-Tube and Interpupillary Distance Adjustment Settings (55-75mm). Standard M250 Series features include Color Coded DIN Achromatic 4, 10, 40 and 100x Objectives and 10x Widefield Eyepieces. Objectives are mounted on a 4-position, positive click-stop Reverse Nosepiece. All optical surfaces are precisely polished, sealed and coated with anti-fungal, color correction and hardening agents to improve true color viewing while increasing the lifetime of the lenses.
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.
Uneven or dark illumination
MediumSymptoms: Field dim or unevenly lit.
Root cause: Condenser mis-set, iris aperture wrong, nosepiece not clicked into a detent, or dirty optics; lamp aging.
Poor image quality
MediumSymptoms: Blurry or low-contrast image.
Root cause: Wrong/missing 0.17 mm cover glass, oil on a dry DIN objective, air bubbles in the oil, or condenser aperture mis-set.
Illuminator lamp failure
MediumSymptoms: No or dim light.
Root cause: Lamp at end of life or a rheostat/driver fault.
Focus / reverse-nosepiece wear
LowSymptoms: Focus slips or binds, nosepiece detent worn.
Root cause: Worn focus clutch or nosepiece.
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.
Illuminator lamp
Class Frequent wear itemRel. cost $R&R Fairly easy
Rheostat / illuminator driver
Class Major service partRel. cost $R&R Moderate
Focus mechanism / clutch kit
Class Major service partRel. cost $$R&R Difficult
DIN objective lens
Class Major service partRel. cost $$$R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Illuminator lamp | Frequent wear item | $ | Fairly easy |
| Rheostat / illuminator driver | Major service part | $ | Moderate |
| Focus mechanism / clutch kit | Major service part | $$ | Difficult |
| DIN objective lens | Major service part | $$$ | 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: Dark or uneven field
- Click the reverse nosepiece into a detent.
- Set the condenser height and iris aperture.
- Clean all optical surfaces.
- Check the lamp and replace if dim.
- Re-check across objectives.
Symptom: Blurry image
- Fit a 0.17 mm cover glass, slide right-side up.
- Remove oil from dry objectives; use oil only with the 100x.
- Clear air bubbles from the oil.
- Set the condenser aperture.
- Re-check after cleaning all optics.
Technical Specs
- Height
- 14.4 in
- Length
- 8.5 in
- Weight
- 13 lbs
- Width
- 6.5 in
Documents & Manuals
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