Motic BA210E, Instruction Manual

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7. TROUBLESHOOTING TABLE
As you use your microscope, you may occasionally experience a problem.
The troubleshooting table below contains the majority of frequently encountered problems and the
possible causes.
7.1 Optical
Problem Possible Cause
Vignetting or uneven brightness in the field of
view or field of view only partially visible
Lamp not installed properly
Condenser not mounted correctly
Condenser is set too low
Aperture diaphragm closed too far
Revolving nosepiece not clicked into position
Trinocular eyepiece tube optical path selector
lever in intermediate position
Filter not in placed in properly
Dust or dirt in the field of view
Aperture diaphragm closed too far
Condenser is set too low
Dust or dirt on specimen surface
Dust or dirt on field lens, filter, condenser or
eyepiece
Poor image (low contrast or resolution)
Condenser is set too low
Aperture diaphragm closed too far
No cover glass
Too thick or thin cover glass
Immersion oil not used with oil immersion lens
Air bubbles in immersion oil
Specified immersion oil not used
Immersion oil on dry objective
Greasy residue on eye lens
Incorrect illumination
Uneven focus
Specimen holder not fixed securely on stage
Specimen not secured in position
Specimen tilted on stage surface