Chapter 8 Troubleshooting
1 Optical
39
8
Darkness at the periphery, no viewfield seen,
or uneven viewfield brightness.
Causes Corrective Measures
Revolving nosepiece is not in click-stop
position (objective not centered in the
optical path).
Revolve to click-stop position (swing the
objective correctly into the optical path).
Condenser position is not correct.
If the microscope is equipped with a
field diaphragm, correct positioning so
that the field diaphragm image is
focused on the specimen surface. (P.14)
If the microscope is not equipped with a
field diaphragm, position the condenser
slightly lower than the upper limit.
Condenser is not installed correctly.
Install correctly. (P.30)
Field diaphragm is not centered (if the
microscope is equipped with a field
diaphragm).
Center the field diaphragm. (P.14)
Field diaphragm is closed too far (if the
microscope is equipped with a field
diaphragm).
Open properly. (P.18)
Field lens unit is not installed correctly.
Install correctly. (P.33)
Lamp is not installed correctly.
(for E200 MV series only)
Install correctly. (P.33)
Dirt or dust on the lens (condenser,
objective, field lens, eyepiece,
specimen)
Clean the lens. (P.44)
When an optical path switchable
eyepiece tube is attached, the optical-
path selection lever is in the
intermediate position.
Switch the optical path to the eyepiece
100% properly.
When an optical path switchable
eyepiece tube is attached, optical path is
not switched to the eyepiece 100%.
Switch the optical path to the eyepiece
100%.
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