15
4.2 Troubleshooting
Problem Cause Remedy
The field of view is not
completely visible.
Nosepiece with objective
has not been switched
into click-stop position.
Switch nosepiece with
objective into click-stop
position.
Condenser has not been
set correctly.
Set condenser correctly.
The aperture diaphragm
has not been adjusted
correctly.
Adjust aperture
diaphragm correctly.
Low resolving power, poor
image contrast.
The aperture diaphragm
has not been opened to
correct size.
Set opening of aperture
diaphragm to correct size.
Condenser not focused
correctly.
Focus the condenser.
Wrong cover glass
thickness selected
for use of transmitted-
light objectives corrected
for 0.17mm cover glass.
Use standard 0.17 mm
cover glass.
Use of no or non-specified
immersion oil with
immersion objective.
Use the supplied
immersion oil.
Air bubbles in immersion
oil.
Remove the bubbles by
applying new oil or
moving the objective to
and fro.
Immersion oil on the front
lens of a dry objective.
Clean the front lens of the
dry objective.
Dirt or dust on the optical
surfaces of objectives,
eyepieces, condenser, or
filters
Clean the respective
optical components.
Greater focus differences
after changing the
objective.
The adjustable eyepieces
have not
been set correctly.
Set the adjustable
eyepieces to the
corresponding defective
vision.
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