Nikon ECLIPSE Ei Instructions Manual page 67

Image too bright
Problems
Setting of the brightness control knob
Insufficient brightness
Problems
Setting of the brightness control knob
Aperture diaphragm is closed too far.
Darkness at the periphery, no viewfield seen, or uneven viewfield brightness
Problems
Revolving nosepiece is not in click-stop
position. (the objective is not centered in the
optical path).
Dirt or dust on the lens (condenser, objective,
field lens, eyepiece), specimen
Image dark on one side
(One side of the viewfield (up, down, right, or left) is not focused.)
Problems
Revolving nosepiece is not in click-stop
position.
Specimen rises from stage surface.
The thickness of the sample (section) is not
uniform and has a tilt.
Image shifts during focus
(Becomes asymmetrically defocused when moving the focal point.)
Problems
Revolving nosepiece is not in click-stop
position.
Specimen rises from stage surface.
The thickness of the sample (section) is not
uniform and has a tilt.
Chapter 5 Troubleshooting
Adjust the brightness by rotating the brightness control

knob.
Adjust the brightness by rotating the brightness control

knob.
Open properly. (→ Section 3.5)

Revolve to click-stop position (swing the objective

correctly into the optical path).
Clean dirt and dust. (→ Section 6.1)

Revolve to click-stop position.

Stabilize it using the holder.

Prepare a sample (section) of uniform thickness.

Revolve to click-stop position.

Stabilize it using the holder.

Prepare a sample (section) of uniform thickness.

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