UNICO M220
UNICO · Model M220
This durable and reliable microscope is built to last. The Unico M220 LED Monocular Microscope is designed for High School Biology and includes an Arm-Mounted Cord Wrap, Dust Cover and Instruction Manual. Select from a wide range of models and features to meet your needs. Pick from traditional models with Cool-Lite Fluorescent Bulbs or LED Bulbs.
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: Vignetting, dark edges, uneven brightness across the field.
Root cause: Condenser height/aperture wrong, field diaphragm not centred, nosepiece not clicked in, or dirty optics; lamp/LED aging.
Poor image quality / low contrast
MediumSymptoms: Blurry or low-contrast image.
Root cause: Wrong or missing 0.17 mm cover glass, immersion oil on a dry objective, air bubbles in the oil, or condenser aperture mis-set.
Illuminator lamp / LED failure
MediumSymptoms: No or dim light, will not brighten.
Root cause: Lamp / LED at end of life, or a rheostat / driver fault.
Focus / stage / nosepiece wear
LowSymptoms: Focus slips or binds, stage stiff or slips, nosepiece detent worn.
Root cause: Worn focus clutch or dried stage grease.
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 / LED module
Class Periodic replacementRel. 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 $$R&R Difficult
Objective lens (DIN achromat)
Class Major service partRel. cost $$$R&R Fairly easy
Mains fuse
Class Major service partRel. cost $R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Illuminator lamp / LED module | Periodic replacement | $ | Fairly easy |
| Rheostat / illuminator driver | Major service part | $ | Moderate |
| Focus mechanism / clutch kit | Major service part | $$ | Difficult |
| Objective lens (DIN achromat) | Major service part | $$$ | Fairly easy |
| 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: Dark or uneven field
- Click the nosepiece fully into a detent.
- Set the condenser height and aperture and centre the field diaphragm (Kohler).
- Clean the objective, condenser, eyepieces and collector.
- Check / replace the lamp or LED if dim.
- Re-check across objectives.
Symptom: Blurry image
- Fit a 0.17 mm cover glass, slide right-side up.
- Remove immersion oil from dry objectives; use oil only with oil objectives and clear bubbles.
- Set the condenser aperture.
- Clean all optical surfaces.
- Re-evaluate the image.
Technical Specs
- Height
- 11.5 in
- Length
- 8.5 in
- Weight
- 8 lbs
- Width
- 5 in
Documents & Manuals
Related calculators
From BioLab, for work done with this kind of equipment.
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