Nikon ECLIPSE E200 POL Instructions Manual page 47

Troubles
Dirt or dust in the viewfield.
Troubles
Poor image quality (low
resolution, contrast too low
or too high)
VIII Troubleshooting Tables
1 Optical
Causes
Condenser position too low or
too high.
Aperture diaphragm closed too
far.
Dirt or dust on the lens
(condenser, objective, field lens,
eyepiece, specimen).
Causes
Condenser position too low.
Cover glass too thick or thin.
Slide upside down.
No cover glass attached to the
slide.
No immersion oil used on the
front lens of the oil-immersion
objective.
Nikon immersion oil is not used
for oil-immersion observation.
Air bubbles in immersion oil.
Immersion oil found on dry type
objective (especially 40x
objective).
Aperture diaphragm closed too
far.
Correction ring on the objective
not adjusted. (Only for the
objective with correction ring.)
Dirt or dust on the lens
(condenser, objective, field lens,
eyepiece, specimen).
Objective for covered specimen
is used to observe no-covered
specimen.
45
Corrective Measures
Position the condenser slightly
lower than the upper limit. (P. 38)
Open properly. (P. 21)
Clean the lens. (P. 49)
Corrective Measures
Position the condenser slightly
lower than the upper limit. (P. 38)
Use a cover glass of the
specified thickness (0.17 mm).
Turn over the slide so that the
cover glass faces up.
Attach a cover glass 0.17 mm
thick.
Apply Nikon immersion oil to the
objective. (P. 31)
Use Nikon immersion oil. (P. 31)
Remove bubbles. (P. 31)
Clean the objective. (P. 31)
Close or open properly. (P. 21)
Adjust to match the thickness of
the cover-glass.
Clean the lens. (P. 49)
Use no-cover-glass objective.
Note:Indication on the objective
∞/0.17 ：for covered specimen
∞/0 ：for no-covered specimen
∞/– :for covered and
no-covered specimen
VIII