Nikon ECLIPSE E200 MV Series Instruction Manual page 51

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