Nikon ECLIPSE E200 MV Series Instruction Manual page 52

Image dark on one side. (One side of the viewfield (up, down,
Causes
Revolving nosepiece is not in click-stop
position.
Specimen rises from stage surface.
Image shifts during focus. (Becomes asymmetrically defocused
Causes
Revolving nosepiece is not in click-stop
position.
Specimen rises from stage surface.
Field diaphragm is not centered (if the
microscope is equipped with a field
diaphragm)
Chapter 8 Troubleshooting
1 Optical
right, or left) is not focused.)
when moving the focal point.)
40
Corrective Measures
Revolve to click-stop position.
Stabilize it using the holder.
Corrective Measures
Revolve to click-stop position.
Stabilize it using the holder.
Center the field diaphragm. (P.14)