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VIII. 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.
Optical
e
s
u
a
C
e
l
b
i
s
s
o
P
Problem
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
Filter not in placed in properly
Blur image or dirt in the field of view
Aperture diaphragm closed too far
Dust or dirt on specimen surface
Dust or dirt on field lens, filter, condenser or
eyepiece
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
Image tinged yellow
Lamp voltage is set too low
Blue filter is not being used
Focusing is not possible with high
magnification objectives
Slide is upside down
Cover glass is too thick
